Re: [PATCH 1/4] counter: Internalize sysfs interface code

From: Jonathan Cameron
Date: Sun May 03 2020 - 10:44:34 EST

Next message: Adam Ford: "Re: [RFC PATCH 4/4] arm64: dts: imx8mm: Add GPU nodes for 2D and 3D core using Etnaviv"
Previous message: Jens Axboe: "Re: [PATCH v4] eventfd: convert to f_op->read_iter()"
In reply to: kbuild test robot: "Re: [PATCH 1/4] counter: Internalize sysfs interface code"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

On Wed, 29 Apr 2020 14:11:35 -0400
William Breathitt Gray <vilhelm.gray@xxxxxxxxx> wrote:

> This is a reimplementation of the Generic Counter driver interface.
> There are no modifications to the Counter subsystem userspace interface,
> so existing userspace applications should continue to run seamlessly.
>
> Overview
> ========
>
> The purpose of this patch is to internalize the sysfs interface code
> among the various counter drivers into a shared module. Counter drivers
> pass and take data natively (i.e. unsigned long, bool, size_t, etc.) and
> the shared counter module handles the translation between the sysfs
> interface. This gurantees a standard userspace interface for all counter
> drivers, and helps generalize the Generic Counter driver ABI in order to
> support the Generic Counter chardev interface (introduced in a
> subsequent patch) without changes to the existing counter drivers.
>
> A high-level view of how a count value is passed down from a counter
> driver can be exemplified by the following:
>
> ----------------------
> / Counter device \
> +----------------------+
> | Count register: 0x28 |
> +----------------------+
> |
> -----------------
> / raw count data /
> -----------------
> |
> V
> +----------------------------+
> | Counter device driver |----------+
> +----------------------------+ |
> | Processes data from device | -------------------
> |----------------------------| / driver callbacks /
> | Type: unsigned long | -------------------
> | Value: 42 | |
> +----------------------------+ |
> | |
> ---------------- |
> / unsigned long / |
> ---------------- |
> | |
> | V
> | +----------------------+
> | | Counter core |
> | +----------------------+
> | | Routes device driver |
> | | callbacks to the |
> | | userspace interfaces |
> | +----------------------+
> | |
> | -------------------
> | / driver callbacks /
> | -------------------
> | |
> +-------+ |
> | |
> | +---------------+
> | |
> V |
> +--------------------+ |
> | Counter sysfs |<-+
> +--------------------+
> | Translates to the |
> | standard Counter |
> | sysfs output |
> |--------------------|
> | Type: const char * |
> | Value: "42" |
> +--------------------+
> |
> ---------------
> / const char * /
> ---------------
> |
> V
> +--------------------------------------------------+
> | `/sys/bus/counter/devices/counterX/countY/count` |
> +--------------------------------------------------+
> \ Count: "42" /
> --------------------------------------------------
>
> There are three primary components involved:
>
> Counter device driver
> ---------------------
> Communicates with the hardware device to read/write data; e.g.
> counter drivers for 104-quad-8, stm32-timer, etc.
>
> Counter core
> ------------
> Registers the counter device driver to the system so that the
> respective callbacks are called during userspace interaction
>
> Counter sysfs
> -------------
> Translates counter data to the standard Counter sysfs interface
> format and vice versa
>
> Driver ABI
> ==========
>
> This reimplementation entails several changes to the driver ABI. In
> particular, the device driver callbacks are now expected to handle
> standard C datatypes rather than translating the sysfs I/O directly.
>
> To that end, the struct counter_data structure is introduced to
> establish counter extensions for Signals, Synapses, and Counts:
>
> struct counter_data {
> enum counter_data_type type;
> const char *name;
> void *read;
Untyped read and write functions seem very likely to be prone to problems.
Perhaps use a union to make sure each of the function patterns is named
and can be explicitly set?

> void *write;
> void *priv;
> };
>
> The "type" member specifies the type of data (e.g. unsigned long,
> boolean, etc.) handled by this extension. The "read" and "write" members
> can then be set by the counter device driver with callbacks to handle
> that data.
>
> Convenience macros such as COUNTER_DATA_UNSIGNED_LONG are provided for
> use by driver authors. In particular, driver authors are expected to use
> the provided macros for standard Counter subsystem attributes in order
> to maintain a consistent interface for userspace. For example, a counter
> device driver may define several standard attributes like so:
>
> struct counter_data count_ext[] = {
> COUNTER_DATA_DIRECTION(count_direction_read),
> COUNTER_DATA_ENABLE(count_enable_read, count_enable_write),
> COUNTER_DATA_CEILING(count_ceiling_read, count_ceiling_write),
> };
>
> This makes it intuitive to see, add, and modify the attributes that are
> supported by this driver ("direction", "enable", and "ceiling") and to
> maintain this code without getting lost in a web of struct braces.
>
> Callbacks must match the function type expected for the respective
> component or extension. These types are defined in the
> drivers/counter/counter-function-types.h file.
>
> The corresponding prototypes for the callbacks would be:
>
> int count_direction_read(struct counter_device *counter,
> struct counter_count *count,
> enum counter_count_direction *direction);
> int count_enable_read(struct counter_device *counter,
> struct counter_count *count, bool *enable);
> int count_enable_write(struct counter_device *counter,
> struct counter_count *count, bool enable);
> int count_ceiling_read(struct counter_device *counter,
> struct counter_count *count,
> unsigned long *ceiling);
> int count_ceiling_write(struct counter_device *counter,
> struct counter_count *count,
> unsigned long ceiling);

Perhaps used explicit sizes rather than long which can vary
across different platforms. Starting out with 64 bits
seems like a good idea for counters.

>
> In this way, driver authors no longer need to mess with sysfs strings
> and are instead able to focus on what they actually care about doing --
> getting data to/from the devices -- while the Generic Counter interface
> handles the translation of that data for them between the various
> userspace interfaces (e.g. sysfs and chardev).
>
> Architecture
> ============
>
> Counter device registration is the same as before: drivers populate a
> struct counter_device with components and callbacks, then pass the
> structure to the devm_counter_register function. However, what's
> different now is how the Counter subsystem code handles this
> registration internally.
>
> Whereas before callbacks would interact directly with sysfs data, this
> interaction is now abstracted and instead callbacks interact with native
> C data types. The counter_data structure forms the basis for Counter
> extentions.
>
> The counter-sysfs.c file contains the code to parse through the
> counter_device structure and register the requested components and
> extensions. Attributes are created and populated based on type, with
> respective translation functions to handle the mapping between sysfs and
> the counter driver callbacks.
>
> The counter-sysfs-callbacks.c file contains the code to map between the
> abstract read and write callbacks of the counter driver and the more
> specific show and store callbacks expected for sysfs. This mapping is
> represented by the counter_data_sysfs_show and counter_data_sysfs_store
> arrays, which point to the show and store translation functions for each
> attribute.
>
> The translation performed for each attribute is straightforward: the
> attribute type and data is parsed from the counter_attribute structure,
> the respective counter driver read/write callback is cast, and sysfs
> I/O is handled before or after the driver read/write function is called.
>
> The counter-function-types.h file contains the typedefs to simplify this
> casting code. The counter-strings.h file contains the standard Counter
> sysfs I/O string constants to maintain a consistent interface for
> userspace.
>
> Cc: Syed Nayyar Waris <syednwaris@xxxxxxxxx>
> Cc: Patrick Havelange <patrick.havelange@xxxxxxxxxxxxx>
> Cc: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
> Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
> Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
> Cc: David Lechner <david@xxxxxxxxxxxxxx>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>

Various specific comments inline.

In general, moving to a non string based interface seems to eventually happen
to all subsystems ;) Strings just don't lend themselves to flexible interfaces.

Basic approach looks reasonable to me.

Jonathan

> ---
> MAINTAINERS | 2 +-
> drivers/counter/104-quad-8.c | 437 +++---
> drivers/counter/Makefile | 1 +
> drivers/counter/counter-core.c | 190 +++
> drivers/counter/counter-function-types.h | 81 ++
> drivers/counter/counter-strings.h | 46 +
> drivers/counter/counter-sysfs-callbacks.c | 566 ++++++++
> drivers/counter/counter-sysfs-callbacks.h | 28 +
> drivers/counter/counter-sysfs.c | 524 ++++++++
> drivers/counter/counter-sysfs.h | 14 +
> drivers/counter/counter.c | 1496 ---------------------
> drivers/counter/ftm-quaddec.c | 46 +-
> drivers/counter/stm32-lptimer-cnt.c | 159 +--
> drivers/counter/stm32-timer-cnt.c | 132 +-
> drivers/counter/ti-eqep.c | 170 +--
> include/linux/counter.h | 545 +++-----
> include/linux/counter_enum.h | 45 -
> include/uapi/linux/counter-types.h | 67 +
> 18 files changed, 2130 insertions(+), 2419 deletions(-)
> create mode 100644 drivers/counter/counter-core.c
> create mode 100644 drivers/counter/counter-function-types.h
> create mode 100644 drivers/counter/counter-strings.h
> create mode 100644 drivers/counter/counter-sysfs-callbacks.c
> create mode 100644 drivers/counter/counter-sysfs-callbacks.h
> create mode 100644 drivers/counter/counter-sysfs.c
> create mode 100644 drivers/counter/counter-sysfs.h
> delete mode 100644 drivers/counter/counter.c
> delete mode 100644 include/linux/counter_enum.h
> create mode 100644 include/uapi/linux/counter-types.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 10eb348c801c..89def3fe1c76 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4367,7 +4367,7 @@ F: Documentation/ABI/testing/sysfs-bus-counter*
> F: Documentation/driver-api/generic-counter.rst
> F: drivers/counter/
> F: include/linux/counter.h
> -F: include/linux/counter_enum.h
> +F: include/uapi/linux/counter-types.h
>
> CPMAC ETHERNET DRIVER
> M: Florian Fainelli <f.fainelli@xxxxxxxxx>
> diff --git a/drivers/counter/104-quad-8.c b/drivers/counter/104-quad-8.c
> index 9dab190c49b0..bc1801e1bce9 100644
> --- a/drivers/counter/104-quad-8.c
> +++ b/drivers/counter/104-quad-8.c
> @@ -651,21 +651,22 @@ static int quad8_count_write(struct counter_device *counter,
> }
>
> enum quad8_count_function {
> - QUAD8_COUNT_FUNCTION_PULSE_DIRECTION = 0,
> - QUAD8_COUNT_FUNCTION_QUADRATURE_X1,
> - QUAD8_COUNT_FUNCTION_QUADRATURE_X2,
> - QUAD8_COUNT_FUNCTION_QUADRATURE_X4
> + QUAD8_COUNT_FUNCTION_PULSE_DIRECTION = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
> + QUAD8_COUNT_FUNCTION_QUADRATURE_X1 = COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A,
> + QUAD8_COUNT_FUNCTION_QUADRATURE_X2 = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
> + QUAD8_COUNT_FUNCTION_QUADRATURE_X4 = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,

Feels like you'd be better off just dropping the local enum entirely.
I guess it gives you a small amount of protection against undefined values,
but at cost of some otherwise pointless indirection.

> };
>
> -static enum counter_count_function quad8_count_functions_list[] = {
> - [QUAD8_COUNT_FUNCTION_PULSE_DIRECTION] = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
> - [QUAD8_COUNT_FUNCTION_QUADRATURE_X1] = COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A,
> - [QUAD8_COUNT_FUNCTION_QUADRATURE_X2] = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
> - [QUAD8_COUNT_FUNCTION_QUADRATURE_X4] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4
> +static const enum counter_count_function quad8_count_functions_list[] = {
> + QUAD8_COUNT_FUNCTION_PULSE_DIRECTION,
> + QUAD8_COUNT_FUNCTION_QUADRATURE_X1,
> + QUAD8_COUNT_FUNCTION_QUADRATURE_X2,
> + QUAD8_COUNT_FUNCTION_QUADRATURE_X4,
> };
>
> -static int quad8_function_get(struct counter_device *counter,
> - struct counter_count *count, size_t *function)
> +static int quad8_function_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_function *function)
> {
> const struct quad8_iio *const priv = counter->priv;
> const int id = count->id;
> @@ -690,11 +691,13 @@ static int quad8_function_get(struct counter_device *counter,
> return 0;
> }
>
> -static int quad8_function_set(struct counter_device *counter,
> - struct counter_count *count, size_t function)
> +static int quad8_function_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_function function)
> {
> struct quad8_iio *const priv = counter->priv;
> const int id = count->id;
> + const enum quad8_count_function cnt_function = function;
> unsigned int *const quadrature_mode = priv->quadrature_mode + id;
> unsigned int *const scale = priv->quadrature_scale + id;
> unsigned int mode_cfg = priv->count_mode[id] << 1;
> @@ -702,7 +705,7 @@ static int quad8_function_set(struct counter_device *counter,
> const unsigned int idr_cfg = priv->index_polarity[id] << 1;
> const int base_offset = priv->base + 2 * id + 1;
>
> - if (function == QUAD8_COUNT_FUNCTION_PULSE_DIRECTION) {
> + if (cnt_function == QUAD8_COUNT_FUNCTION_PULSE_DIRECTION) {
> *quadrature_mode = 0;
>
> /* Quadrature scaling only available in quadrature mode */
> @@ -717,7 +720,7 @@ static int quad8_function_set(struct counter_device *counter,
> } else {
> *quadrature_mode = 1;
>
> - switch (function) {
> + switch (cnt_function) {
> case QUAD8_COUNT_FUNCTION_QUADRATURE_X1:
> *scale = 0;
> mode_cfg |= QUAD8_CMR_QUADRATURE_X1;
> @@ -730,6 +733,7 @@ static int quad8_function_set(struct counter_device *counter,
> *scale = 2;
> mode_cfg |= QUAD8_CMR_QUADRATURE_X4;
> break;
> + default: return -EINVAL;
> }
> }
>
> @@ -739,8 +743,9 @@ static int quad8_function_set(struct counter_device *counter,
> return 0;
> }
>
> -static void quad8_direction_get(struct counter_device *counter,
> - struct counter_count *count, enum counter_count_direction *direction)
> +static int quad8_direction_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_direction *direction)
> {
> const struct quad8_iio *const priv = counter->priv;
> unsigned int ud_flag;
> @@ -751,91 +756,81 @@ static void quad8_direction_get(struct counter_device *counter,
>
> *direction = (ud_flag) ? COUNTER_COUNT_DIRECTION_FORWARD :
> COUNTER_COUNT_DIRECTION_BACKWARD;
> -}
>
> -enum quad8_synapse_action {
> - QUAD8_SYNAPSE_ACTION_NONE = 0,
> - QUAD8_SYNAPSE_ACTION_RISING_EDGE,
> - QUAD8_SYNAPSE_ACTION_FALLING_EDGE,
> - QUAD8_SYNAPSE_ACTION_BOTH_EDGES
> -};
> + return 0;
> +}
>
> -static enum counter_synapse_action quad8_index_actions_list[] = {
> - [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> - [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE
> +static const enum counter_synapse_action quad8_index_actions_list[] = {
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> };
>
> -static enum counter_synapse_action quad8_synapse_actions_list[] = {
> - [QUAD8_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> - [QUAD8_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> - [QUAD8_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> - [QUAD8_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> +static const enum counter_synapse_action quad8_synapse_actions_list[] = {
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> };
>
> -static int quad8_action_get(struct counter_device *counter,
> - struct counter_count *count, struct counter_synapse *synapse,
> - size_t *action)
> +static int quad8_action_read(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> struct quad8_iio *const priv = counter->priv;
> int err;
> - size_t function = 0;
> + enum counter_count_function function = 0;
> const size_t signal_a_id = count->synapses[0].signal->id;
> enum counter_count_direction direction;
>
> /* Handle Index signals */
> if (synapse->signal->id >= 16) {
> if (priv->preset_enable[count->id])
> - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> else
> - *action = QUAD8_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
>
> return 0;
> }
>
> - err = quad8_function_get(counter, count, &function);
> + err = quad8_function_read(counter, count, &function);
> if (err)
> return err;
>
> /* Default action mode */
> - *action = QUAD8_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
>
> /* Determine action mode based on current count function mode */
> switch (function) {
> case QUAD8_COUNT_FUNCTION_PULSE_DIRECTION:
> if (synapse->signal->id == signal_a_id)
> - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> break;
> case QUAD8_COUNT_FUNCTION_QUADRATURE_X1:
> if (synapse->signal->id == signal_a_id) {
> - quad8_direction_get(counter, count, &direction);
> + err = quad8_direction_read(counter, count, &direction);
> + if (err)
> + return err;
>
> if (direction == COUNTER_COUNT_DIRECTION_FORWARD)
> - *action = QUAD8_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> else
> - *action = QUAD8_SYNAPSE_ACTION_FALLING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_FALLING_EDGE;
> }
> break;
> case QUAD8_COUNT_FUNCTION_QUADRATURE_X2:
> if (synapse->signal->id == signal_a_id)
> - *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> break;
> case QUAD8_COUNT_FUNCTION_QUADRATURE_X4:
> - *action = QUAD8_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> break;
> + default: return -EINVAL;
> }
>
> return 0;
> }
>
> -static const struct counter_ops quad8_ops = {
> - .signal_read = quad8_signal_read,
> - .count_read = quad8_count_read,
> - .count_write = quad8_count_write,
> - .function_get = quad8_function_get,
> - .function_set = quad8_function_set,
> - .action_get = quad8_action_get
> -};
> -
> static int quad8_index_polarity_get(struct counter_device *counter,
> struct counter_signal *signal, size_t *index_polarity)
> {
> @@ -864,12 +859,7 @@ static int quad8_index_polarity_set(struct counter_device *counter,
> return 0;
> }
>
> -static struct counter_signal_enum_ext quad8_index_pol_enum = {
> - .items = quad8_index_polarity_modes,
> - .num_items = ARRAY_SIZE(quad8_index_polarity_modes),
> - .get = quad8_index_polarity_get,
> - .set = quad8_index_polarity_set
> -};
> +static DEFINE_COUNTER_ENUM(quad8_index_pol_enum, quad8_index_polarity_modes);
>
> static int quad8_synchronous_mode_get(struct counter_device *counter,
> struct counter_signal *signal, size_t *synchronous_mode)
> @@ -903,22 +893,21 @@ static int quad8_synchronous_mode_set(struct counter_device *counter,
> return 0;
> }
>
> -static struct counter_signal_enum_ext quad8_syn_mode_enum = {
> - .items = quad8_synchronous_modes,
> - .num_items = ARRAY_SIZE(quad8_synchronous_modes),
> - .get = quad8_synchronous_mode_get,
> - .set = quad8_synchronous_mode_set
> -};
> +static DEFINE_COUNTER_ENUM(quad8_syn_mode_enum, quad8_synchronous_modes);
>
> -static ssize_t quad8_count_floor_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_floor_read(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long *floor)
> {
> /* Only a floor of 0 is supported */
> - return sprintf(buf, "0\n");
> + *floor = 0;
> +
> + return 0;
> }
>
> -static int quad8_count_mode_get(struct counter_device *counter,
> - struct counter_count *count, size_t *cnt_mode)
> +static int quad8_count_mode_read(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_mode *cnt_mode)
> {
> const struct quad8_iio *const priv = counter->priv;
>
> @@ -941,33 +930,35 @@ static int quad8_count_mode_get(struct counter_device *counter,
> return 0;
> }
>
> -static int quad8_count_mode_set(struct counter_device *counter,
> - struct counter_count *count, size_t cnt_mode)
> +static int quad8_count_mode_write(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_mode cnt_mode)
> {
> struct quad8_iio *const priv = counter->priv;
> + unsigned int count_mode = 0;
> unsigned int mode_cfg;
> const int base_offset = priv->base + 2 * count->id + 1;
>
> /* Map Generic Counter count mode to 104-QUAD-8 count mode */
> switch (cnt_mode) {
> case COUNTER_COUNT_MODE_NORMAL:
> - cnt_mode = 0;
> + count_mode = 0;
> break;
> case COUNTER_COUNT_MODE_RANGE_LIMIT:
> - cnt_mode = 1;
> + count_mode = 1;
> break;
> case COUNTER_COUNT_MODE_NON_RECYCLE:
> - cnt_mode = 2;
> + count_mode = 2;
> break;
> case COUNTER_COUNT_MODE_MODULO_N:
> - cnt_mode = 3;
> + count_mode = 3;
> break;
> }
>
> - priv->count_mode[count->id] = cnt_mode;
> + priv->count_mode[count->id] = count_mode;
>
> /* Set count mode configuration value */
> - mode_cfg = cnt_mode << 1;
> + mode_cfg = count_mode << 1;
>
> /* Add quadrature mode configuration */
> if (priv->quadrature_mode[count->id])
> @@ -979,92 +970,89 @@ static int quad8_count_mode_set(struct counter_device *counter,
> return 0;
> }
>
> -static struct counter_count_enum_ext quad8_cnt_mode_enum = {
> - .items = counter_count_mode_str,
> - .num_items = ARRAY_SIZE(counter_count_mode_str),
> - .get = quad8_count_mode_get,
> - .set = quad8_count_mode_set
> +static enum counter_count_mode quad8_cnt_modes[] = {
> + COUNTER_COUNT_MODE_NORMAL,
> + COUNTER_COUNT_MODE_RANGE_LIMIT,
> + COUNTER_COUNT_MODE_NON_RECYCLE,
> + COUNTER_COUNT_MODE_MODULO_N,
> };
>
> -static ssize_t quad8_count_direction_read(struct counter_device *counter,
> - struct counter_count *count, void *priv, char *buf)
> -{
> - enum counter_count_direction dir;
> -
> - quad8_direction_get(counter, count, &dir);
> -
> - return sprintf(buf, "%s\n", counter_count_direction_str[dir]);
> -}
> +static DEFINE_COUNTER_AVAILABLE(quad8_count_mode_available, quad8_cnt_modes);
>
> -static ssize_t quad8_count_enable_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_enable_read(struct counter_device *counter,
> + struct counter_count *count, bool *enable)
> {
> const struct quad8_iio *const priv = counter->priv;
>
> - return sprintf(buf, "%u\n", priv->ab_enable[count->id]);
> + *enable = priv->ab_enable[count->id];
> +
> + return 0;
> }
>
> -static ssize_t quad8_count_enable_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_enable_write(struct counter_device *counter,
> + struct counter_count *count, bool enable)
> {
> struct quad8_iio *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id;
> - int err;
> - bool ab_enable;
> unsigned int ior_cfg;
>
> - err = kstrtobool(buf, &ab_enable);
> - if (err)
> - return err;
> + priv->ab_enable[count->id] = enable;
>
> - priv->ab_enable[count->id] = ab_enable;
> -
> - ior_cfg = ab_enable | priv->preset_enable[count->id] << 1;
> + ior_cfg = enable | priv->preset_enable[count->id] << 1;
>
> /* Load I/O control configuration */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset + 1);
>
> - return len;
> + return 0;
> }
>
> -static int quad8_error_noise_get(struct counter_device *counter,
> - struct counter_count *count, size_t *noise_error)
> +static ssize_t quad8_error_noise_read(struct counter_device *counter,
> + struct counter_count *count, char *buf,
> + size_t size)
> {
> const struct quad8_iio *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id + 1;
> + size_t noise_error;
>
> - *noise_error = !!(inb(base_offset) & QUAD8_FLAG_E);
> + noise_error = !!(inb(base_offset) & QUAD8_FLAG_E);
>
> - return 0;
> + return snprintf(buf, size, "%s\n",
> + quad8_noise_error_states[noise_error]);
> }
>
> -static struct counter_count_enum_ext quad8_error_noise_enum = {
> - .items = quad8_noise_error_states,
> - .num_items = ARRAY_SIZE(quad8_noise_error_states),
> - .get = quad8_error_noise_get
> -};
> +static ssize_t quad8_error_noise_available_read(struct counter_device *counter,
> + struct counter_count *count,
> + char *buf, size_t size)
> +{
> + size_t i;
> + size_t len = 0;
>
> -static ssize_t quad8_count_preset_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> + for (i = 0; i < ARRAY_SIZE(quad8_noise_error_states) && size > 1; i++)
> + len += scnprintf(buf + len, size - len, "%s\n",
> + quad8_noise_error_states[i]);
> +
> + return len;
> +}
> +
> +static int quad8_count_preset_read(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long *preset)
> {
> const struct quad8_iio *const priv = counter->priv;
>
> - return sprintf(buf, "%u\n", priv->preset[count->id]);
> + *preset = priv->preset[count->id];
> +
> + return 0;
> }
>
> -static ssize_t quad8_count_preset_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_preset_write(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long preset)
> {
> struct quad8_iio *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id;
> - unsigned int preset;
> - int ret;
> int i;
>
> - ret = kstrtouint(buf, 0, &preset);
> - if (ret)
> - return ret;
> -
> /* Only 24-bit values are supported */
> if (preset > 0xFFFFFF)
> return -EINVAL;
> @@ -1078,11 +1066,12 @@ static ssize_t quad8_count_preset_write(struct counter_device *counter,
> for (i = 0; i < 3; i++)
> outb(preset >> (8 * i), base_offset);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t quad8_count_ceiling_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_ceiling_read(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long *ceiling)
> {
> const struct quad8_iio *const priv = counter->priv;
>
> @@ -1090,15 +1079,18 @@ static ssize_t quad8_count_ceiling_read(struct counter_device *counter,
> switch (priv->count_mode[count->id]) {
> case 1:
> case 3:
> - return quad8_count_preset_read(counter, count, private, buf);
> + return quad8_count_preset_read(counter, count, ceiling);
> }
>
> /* By default 0x1FFFFFF (25 bits unsigned) is maximum count */
> - return sprintf(buf, "33554431\n");
> + *ceiling = 0x1FFFFFF;
> +
> + return 0;
> }
>
> -static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_ceiling_write(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long ceiling)
> {
> struct quad8_iio *const priv = counter->priv;
>
> @@ -1106,34 +1098,31 @@ static ssize_t quad8_count_ceiling_write(struct counter_device *counter,
> switch (priv->count_mode[count->id]) {
> case 1:
> case 3:
> - return quad8_count_preset_write(counter, count, private, buf,
> - len);
> + return quad8_count_preset_write(counter, count, ceiling);
> }
>
> - return len;
> + return -EINVAL;
> }
>
> -static ssize_t quad8_count_preset_enable_read(struct counter_device *counter,
> - struct counter_count *count, void *private, char *buf)
> +static int quad8_count_preset_enable_read(struct counter_device *counter,
> + struct counter_count *count,
> + bool *preset_enable)
> {
> const struct quad8_iio *const priv = counter->priv;
>
> - return sprintf(buf, "%u\n", !priv->preset_enable[count->id]);
> + *preset_enable = !priv->preset_enable[count->id];
> +
> + return 0;
> }
>
> -static ssize_t quad8_count_preset_enable_write(struct counter_device *counter,
> - struct counter_count *count, void *private, const char *buf, size_t len)
> +static int quad8_count_preset_enable_write(struct counter_device *counter,
> + struct counter_count *count,
> + bool preset_enable)
> {
> struct quad8_iio *const priv = counter->priv;
> const int base_offset = priv->base + 2 * count->id + 1;
> - bool preset_enable;
> - int ret;
> unsigned int ior_cfg;
>
> - ret = kstrtobool(buf, &preset_enable);
> - if (ret)
> - return ret;
> -
> /* Preset enable is active low in Input/Output Control register */
> preset_enable = !preset_enable;
>
> @@ -1144,18 +1133,16 @@ static ssize_t quad8_count_preset_enable_write(struct counter_device *counter,
> /* Load I/O control configuration to Input / Output Control Register */
> outb(QUAD8_CTR_IOR | ior_cfg, base_offset);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t quad8_signal_cable_fault_read(struct counter_device *counter,
> - struct counter_signal *signal,
> - void *private, char *buf)
> +static int quad8_signal_cable_fault_read(struct counter_device *counter,
> + struct counter_signal *signal, bool *cable_fault)
> {
> const struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> const bool disabled = !(priv->cable_fault_enable & BIT(channel_id));
> unsigned int status;
> - unsigned int fault;
>
> if (disabled)
> return -EINVAL;
> @@ -1164,36 +1151,29 @@ static ssize_t quad8_signal_cable_fault_read(struct counter_device *counter,
> status = inb(priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
>
> /* Mask respective channel and invert logic */
> - fault = !(status & BIT(channel_id));
> + *cable_fault = !(status & BIT(channel_id));
>
> - return sprintf(buf, "%u\n", fault);
> + return 0;
> }
>
> -static ssize_t quad8_signal_cable_fault_enable_read(
> - struct counter_device *counter, struct counter_signal *signal,
> - void *private, char *buf)
> +static int quad8_signal_cable_fault_enable_read(struct counter_device *counter,
> + struct counter_signal *signal, bool *enable)
> {
> const struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> - const unsigned int enb = !!(priv->cable_fault_enable & BIT(channel_id));
>
> - return sprintf(buf, "%u\n", enb);
> + *enable = !!(priv->cable_fault_enable & BIT(channel_id));
> +
> + return 0;
> }
>
> -static ssize_t quad8_signal_cable_fault_enable_write(
> - struct counter_device *counter, struct counter_signal *signal,
> - void *private, const char *buf, size_t len)
> +static int quad8_signal_cable_fault_enable_write(struct counter_device *counter,
> + struct counter_signal *signal, bool enable)
> {
> struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> - bool enable;
> - int ret;
> unsigned int cable_fault_enable;
>
> - ret = kstrtobool(buf, &enable);
> - if (ret)
> - return ret;
> -
> if (enable)
> priv->cable_fault_enable |= BIT(channel_id);
> else
> @@ -1204,31 +1184,29 @@ static ssize_t quad8_signal_cable_fault_enable_write(
>
> outb(cable_fault_enable, priv->base + QUAD8_DIFF_ENCODER_CABLE_STATUS);
>
> - return len;
> + return 0;
> }
>
> -static ssize_t quad8_signal_fck_prescaler_read(struct counter_device *counter,
> - struct counter_signal *signal, void *private, char *buf)
> +static int quad8_signal_fck_prescaler_read(struct counter_device *counter,
> + struct counter_signal *signal, unsigned long *prescaler)
> {
> const struct quad8_iio *const priv = counter->priv;
> - const size_t channel_id = signal->id / 2;
>
> - return sprintf(buf, "%u\n", priv->fck_prescaler[channel_id]);
> + *prescaler = priv->fck_prescaler[signal->id / 2];
> +
> + return 0;
> }
>
> -static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter,
> - struct counter_signal *signal, void *private, const char *buf,
> - size_t len)
> +static int quad8_signal_fck_prescaler_write(struct counter_device *counter,
> + struct counter_signal *signal, unsigned long prescaler)
> {
> struct quad8_iio *const priv = counter->priv;
> const size_t channel_id = signal->id / 2;
> const int base_offset = priv->base + 2 * channel_id;
> - u8 prescaler;
> - int ret;
>
> - ret = kstrtou8(buf, 0, &prescaler);
> - if (ret)
> - return ret;
> + /* prescaler is an 8-bit value */
> + if (prescaler > 255)
> + return -ERANGE;
>
> priv->fck_prescaler[channel_id] = prescaler;
>
> @@ -1240,31 +1218,28 @@ static ssize_t quad8_signal_fck_prescaler_write(struct counter_device *counter,
> outb(QUAD8_CTR_RLD | QUAD8_RLD_RESET_BP | QUAD8_RLD_PRESET_PSC,
> base_offset + 1);
>
> - return len;
> + return 0;
> }
>
> -static const struct counter_signal_ext quad8_signal_ext[] = {
> - {
> - .name = "cable_fault",
> - .read = quad8_signal_cable_fault_read
> - },
> - {
> - .name = "cable_fault_enable",
> - .read = quad8_signal_cable_fault_enable_read,
> - .write = quad8_signal_cable_fault_enable_write
> - },
> - {
> - .name = "filter_clock_prescaler",
> - .read = quad8_signal_fck_prescaler_read,
> - .write = quad8_signal_fck_prescaler_write
> - }
> +static struct counter_data quad8_signal_ext[] = {
> + COUNTER_DATA_BOOL("cable_fault", quad8_signal_cable_fault_read, NULL),
> + COUNTER_DATA_BOOL("cable_fault_enable",
> + quad8_signal_cable_fault_enable_read,
> + quad8_signal_cable_fault_enable_write),
> + COUNTER_DATA_UNSIGNED_LONG("filter_clock_prescaler",
> + quad8_signal_fck_prescaler_read,
> + quad8_signal_fck_prescaler_write)
> };
>
> -static const struct counter_signal_ext quad8_index_ext[] = {
> - COUNTER_SIGNAL_ENUM("index_polarity", &quad8_index_pol_enum),
> - COUNTER_SIGNAL_ENUM_AVAILABLE("index_polarity", &quad8_index_pol_enum),
> - COUNTER_SIGNAL_ENUM("synchronous_mode", &quad8_syn_mode_enum),
> - COUNTER_SIGNAL_ENUM_AVAILABLE("synchronous_mode", &quad8_syn_mode_enum)
> +static struct counter_data quad8_index_ext[] = {
> + COUNTER_DATA_ENUM_AND_AVAILABLE("index_polarity",
> + quad8_index_polarity_get,
> + quad8_index_polarity_set,
> + quad8_index_pol_enum),
> + COUNTER_DATA_ENUM_AND_AVAILABLE("synchronous_mode",
> + quad8_synchronous_mode_get,
> + quad8_synchronous_mode_set,
> + quad8_syn_mode_enum),
> };
>
> #define QUAD8_QUAD_SIGNAL(_id, _name) { \
> @@ -1333,39 +1308,20 @@ static struct counter_synapse quad8_count_synapses[][3] = {
> QUAD8_COUNT_SYNAPSES(6), QUAD8_COUNT_SYNAPSES(7)
> };
>
> -static const struct counter_count_ext quad8_count_ext[] = {
> - {
> - .name = "ceiling",
> - .read = quad8_count_ceiling_read,
> - .write = quad8_count_ceiling_write
> - },
> - {
> - .name = "floor",
> - .read = quad8_count_floor_read
> - },
> - COUNTER_COUNT_ENUM("count_mode", &quad8_cnt_mode_enum),
> - COUNTER_COUNT_ENUM_AVAILABLE("count_mode", &quad8_cnt_mode_enum),
> - {
> - .name = "direction",
> - .read = quad8_count_direction_read
> - },
> - {
> - .name = "enable",
> - .read = quad8_count_enable_read,
> - .write = quad8_count_enable_write
> - },
> - COUNTER_COUNT_ENUM("error_noise", &quad8_error_noise_enum),
> - COUNTER_COUNT_ENUM_AVAILABLE("error_noise", &quad8_error_noise_enum),
> - {
> - .name = "preset",
> - .read = quad8_count_preset_read,
> - .write = quad8_count_preset_write
> - },
> - {
> - .name = "preset_enable",
> - .read = quad8_count_preset_enable_read,
> - .write = quad8_count_preset_enable_write
> - }
> +static struct counter_data quad8_count_ext[] = {
> + COUNTER_DATA_CEILING(quad8_count_ceiling_read,
> + quad8_count_ceiling_write),
> + COUNTER_DATA_FLOOR(quad8_count_floor_read, NULL),
> + COUNTER_DATA_COUNT_MODE_AND_AVAILABLE(quad8_count_mode_read,
> + quad8_count_mode_write,
> + quad8_count_mode_available),
> + COUNTER_DATA_DIRECTION(quad8_direction_read),
> + COUNTER_DATA_ENABLE(quad8_count_enable_read, quad8_count_enable_write),
> + COUNTER_DATA_ERROR_NOISE_AND_AVAILABLE(quad8_error_noise_read,
> + quad8_error_noise_available_read),
> + COUNTER_DATA_PRESET(quad8_count_preset_read, quad8_count_preset_write),
> + COUNTER_DATA_PRESET_ENABLE(quad8_count_preset_enable_read,
> + quad8_count_preset_enable_write),
> };
>
> #define QUAD8_COUNT(_id, _cntname) { \
> @@ -1421,7 +1377,12 @@ static int quad8_probe(struct device *dev, unsigned int id)
> quad8iio = iio_priv(indio_dev);
> quad8iio->counter.name = dev_name(dev);
> quad8iio->counter.parent = dev;
> - quad8iio->counter.ops = &quad8_ops;
> + quad8iio->counter.signal_read = quad8_signal_read;
> + quad8iio->counter.count_read = quad8_count_read;
> + quad8iio->counter.count_write = quad8_count_write;
> + quad8iio->counter.function_read = quad8_function_read;
> + quad8iio->counter.function_write = quad8_function_write;
> + quad8iio->counter.action_read = quad8_action_read;
> quad8iio->counter.counts = quad8_counts;
> quad8iio->counter.num_counts = ARRAY_SIZE(quad8_counts);
> quad8iio->counter.signals = quad8_signals;
> diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile
> index 55142d1f4c43..2d2644bd7777 100644
> --- a/drivers/counter/Makefile
> +++ b/drivers/counter/Makefile
> @@ -4,6 +4,7 @@
> #
>
> obj-$(CONFIG_COUNTER) += counter.o
> +counter-y := counter-core.o counter-sysfs.o counter-sysfs-callbacks.o
>
> obj-$(CONFIG_104_QUAD_8) += 104-quad-8.o
> obj-$(CONFIG_STM32_TIMER_CNT) += stm32-timer-cnt.o
> diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
> new file mode 100644
> index 000000000000..008d51284a2c
> --- /dev/null
> +++ b/drivers/counter/counter-core.c
> @@ -0,0 +1,190 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Generic Counter interface
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#include <linux/counter.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/export.h>
> +#include <linux/gfp.h>
> +#include <linux/idr.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +
> +#include "counter-sysfs.h"
> +
> +/* Provides a unique ID for each counter device */
> +static DEFINE_IDA(counter_ida);
> +
> +static void counter_device_release(struct device *dev)
> +{
> + struct counter_device *const counter = dev_get_drvdata(dev);
> +
> + counter_sysfs_free(counter);
> + kfree(&counter->dev);
> + ida_simple_remove(&counter_ida, counter->id);
> +}
> +
> +static struct device_type counter_device_type = {
> + .name = "counter_device",
> + .release = counter_device_release
> +};
> +
> +static struct bus_type counter_bus_type = {
> + .name = "counter"
> +};
> +
> +/**
> + * counter_register - register Counter to the system
> + * @counter: pointer to Counter to register
> + *
> + * This function registers a Counter to the system. A sysfs "counter" directory
> + * will be created and populated with sysfs attributes correlating with the
> + * Counter Signals, Synapses, and Counts respectively.
> + */
> +int counter_register(struct counter_device *const counter)
> +{
> + struct device *const dev = &counter->dev;
> + int err;
> +
> + /* Acquire unique ID */
> + counter->id = ida_simple_get(&counter_ida, 0, 0, GFP_KERNEL);
> + if (counter->id < 0)
> + return counter->id;
> +
> + /* Configure device structure for Counter */
> + dev->type = &counter_device_type;
> + dev->bus = &counter_bus_type;
> + if (counter->parent) {
> + dev->parent = counter->parent;
> + dev->of_node = counter->parent->of_node;
> + }
> + dev_set_name(dev, "counter%d", counter->id);
> + device_initialize(dev);
> + dev_set_drvdata(dev, counter);
> +
> + /* Add Counter sysfs attributes */
> + err = counter_sysfs_add(counter);
> + if (err)
> + goto err_free_id;
> +
> + /* Add device to system */
> + err = device_add(dev);
> + if (err)
> + goto err_free_sysfs;
> +
> + return 0;
> +
> +err_free_sysfs:
> + counter_sysfs_free(counter);
> +err_free_id:
> + ida_simple_remove(&counter_ida, counter->id);
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(counter_register);
> +
> +/**
> + * counter_unregister - unregister Counter from the system
> + * @counter: pointer to Counter to unregister
> + *
> + * The Counter is unregistered from the system; all allocated memory is freed.
> + */
> +void counter_unregister(struct counter_device *const counter)
> +{
> + if (counter) {
> + device_del(&counter->dev);
> + counter_sysfs_free(counter);
> + }
> +}
> +EXPORT_SYMBOL_GPL(counter_unregister);
> +
> +static void devm_counter_unreg(struct device *dev, void *res)
> +{
> + counter_unregister(*(struct counter_device **)res);
> +}
> +
> +/**
> + * devm_counter_register - Resource-managed counter_register
> + * @dev: device to allocate counter_device for
> + * @counter: pointer to Counter to register
> + *
> + * Managed counter_register. The Counter registered with this function is
> + * automatically unregistered on driver detach. This function calls
> + * counter_register internally. Refer to that function for more information.
> + *
> + * If an Counter registered with this function needs to be unregistered
> + * separately, devm_counter_unregister must be used.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int devm_counter_register(struct device *dev,
> + struct counter_device *const counter)
> +{
> + struct counter_device **ptr;
> + int ret;
> +
> + ptr = devres_alloc(devm_counter_unreg, sizeof(*ptr), GFP_KERNEL);
> + if (!ptr)
> + return -ENOMEM;
> +
> + ret = counter_register(counter);
> + if (!ret) {
> + *ptr = counter;
> + devres_add(dev, ptr);
> + } else {
> + devres_free(ptr);
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(devm_counter_register);
> +
> +static int devm_counter_match(struct device *dev, void *res, void *data)
> +{
> + struct counter_device **r = res;
> +
> + if (!r || !*r) {
> + WARN_ON(!r || !*r);
> + return 0;
> + }
> +
> + return *r == data;
> +}
> +
> +/**
> + * devm_counter_unregister - Resource-managed counter_unregister

Having just gone through the process of ripping all these out of IIO, is
there actually a valid reason why devm_counter_unregister would ever
be called?

> + * @dev: device this counter_device belongs to
> + * @counter: pointer to Counter associated with the device
> + *
> + * Unregister Counter registered with devm_counter_register.
> + */
> +void devm_counter_unregister(struct device *dev,
> + struct counter_device *const counter)
> +{
> + int rc;
> +
> + rc = devres_release(dev, devm_counter_unreg, devm_counter_match,
> + counter);
> + WARN_ON(rc);
> +}
> +EXPORT_SYMBOL_GPL(devm_counter_unregister);
> +
> +static int __init counter_init(void)
> +{
> + return bus_register(&counter_bus_type);
> +}
> +
> +static void __exit counter_exit(void)
> +{
> + bus_unregister(&counter_bus_type);
> +}
> +
> +subsys_initcall(counter_init);
> +module_exit(counter_exit);
> +
> +MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Generic Counter interface");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/counter/counter-function-types.h b/drivers/counter/counter-function-types.h
> new file mode 100644
> index 000000000000..1a67b3904193
> --- /dev/null
> +++ b/drivers/counter/counter-function-types.h
> @@ -0,0 +1,81 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Counter callback function types
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#ifndef _COUNTER_FUNCTION_TYPES_H_
> +#define _COUNTER_FUNCTION_TYPES_H_
> +
> +#include <linux/counter.h>
> +#include <linux/types.h>
> +
> +#define COUNTER_DATA_CALLBACKS(_name, _type) \
> + typedef int (*counter_count_##_name##_read)(struct counter_device *, \
> + struct counter_count *, \
> + _type *); \
> + typedef int (*counter_count_##_name##_write)(struct counter_device *, \
> + struct counter_count *, \
> + _type); \
> + typedef int (*counter_device_##_name##_read)(struct counter_device *, \
> + _type *); \
> + typedef int (*counter_device_##_name##_write)(struct counter_device *, \
> + _type); \
> + typedef int (*counter_signal_##_name##_read)(struct counter_device *, \
> + struct counter_signal *, \
> + _type *); \
> + typedef int (*counter_signal_##_name##_write)(struct counter_device *, \
> + struct counter_signal *, \
> + _type)
> +
> +COUNTER_DATA_CALLBACKS(bool, bool);
> +COUNTER_DATA_CALLBACKS(lu, unsigned long);
> +COUNTER_DATA_CALLBACKS(zu, size_t);
> +
> +typedef ssize_t (*counter_count_s_read)(struct counter_device *,
> + struct counter_count *, char *, size_t);
> +typedef ssize_t (*counter_count_s_write)(struct counter_device *,
> + struct counter_count *, const char *,
> + size_t);
> +typedef ssize_t (*counter_device_s_read)(struct counter_device *, char *,
> + size_t);
> +typedef ssize_t (*counter_device_s_write)(struct counter_device *, const char *,
> + size_t);
> +typedef ssize_t (*counter_signal_s_read)(struct counter_device *,
> + struct counter_signal *, char *,
> + size_t);
> +typedef ssize_t (*counter_signal_s_write)(struct counter_device *,
> + struct counter_signal *, const char *,
> + size_t);
> +
> +typedef int (*counter_count_function_read)(struct counter_device *,
> + struct counter_count *,
> + enum counter_count_function *);
> +typedef int (*counter_count_function_write)(struct counter_device *,
> + struct counter_count *,
> + enum counter_count_function);
> +
> +typedef int (*counter_signal_signal_read)(struct counter_device *,
> + struct counter_signal *,
> + enum counter_signal_value *);
> +
> +typedef int (*counter_synapse_action_read)(struct counter_device *,
> + struct counter_count *,
> + struct counter_synapse *,
> + enum counter_synapse_action *);
> +typedef int (*counter_synapse_action_write)(struct counter_device *,
> + struct counter_count *,
> + struct counter_synapse *,
> + enum counter_synapse_action);
> +
> +typedef int (*counter_count_direction_read)(struct counter_device *,
> + struct counter_count *,
> + enum counter_count_direction *);
> +
> +typedef int (*counter_count_mode_read)(struct counter_device *,
> + struct counter_count *,
> + enum counter_count_mode *);
> +typedef int (*counter_count_mode_write)(struct counter_device *,
> + struct counter_count *,
> + enum counter_count_mode);
> +
> +#endif /* _COUNTER_FUNCTION_TYPES_H_ */
> diff --git a/drivers/counter/counter-strings.h b/drivers/counter/counter-strings.h
> new file mode 100644
> index 000000000000..d67788e01bb9
> --- /dev/null
> +++ b/drivers/counter/counter-strings.h

Give you are centralising the handling of these, I'd be a bit surprised to ever
see this included from more than one file. As such, I'd just put it in the
c files that uses it.

> @@ -0,0 +1,46 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Generic Counter strings
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#ifndef _COUNTER_STRINGS_H_
> +#define _COUNTER_STRINGS_H_
> +
> +#include <linux/counter.h>
> +
> +const char *const counter_count_direction_str[] = {
> + [COUNTER_COUNT_DIRECTION_FORWARD] = "forward",
> + [COUNTER_COUNT_DIRECTION_BACKWARD] = "backward"
> +};
> +
> +const char *const counter_count_function_str[] = {
> + [COUNTER_COUNT_FUNCTION_INCREASE] = "increase",
> + [COUNTER_COUNT_FUNCTION_DECREASE] = "decrease",
> + [COUNTER_COUNT_FUNCTION_PULSE_DIRECTION] = "pulse-direction",
> + [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A] = "quadrature x1 a",
> + [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b",
> + [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a",
> + [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b",
> + [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4"
> +};
> +
> +const char *const counter_count_mode_str[] = {
> + [COUNTER_COUNT_MODE_NORMAL] = "normal",
> + [COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit",
> + [COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle",
> + [COUNTER_COUNT_MODE_MODULO_N] = "modulo-n"
> +};
> +
> +const char *const counter_signal_value_str[] = {
> + [COUNTER_SIGNAL_LOW] = "low",
> + [COUNTER_SIGNAL_HIGH] = "high"
> +};
> +
> +const char *const counter_synapse_action_str[] = {
> + [COUNTER_SYNAPSE_ACTION_NONE] = "none",
> + [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = "rising edge",
> + [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = "falling edge",
> + [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = "both edges"
> +};
> +
> +#endif /* _COUNTER_STRINGS_H_ */
> diff --git a/drivers/counter/counter-sysfs-callbacks.c b/drivers/counter/counter-sysfs-callbacks.c
> new file mode 100644
> index 000000000000..5740d61e999b
> --- /dev/null
> +++ b/drivers/counter/counter-sysfs-callbacks.c
> @@ -0,0 +1,566 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Generic Counter sysfs callbacks
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#include <linux/counter.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <linux/string.h>
> +#include <linux/types.h>
> +
> +#include "counter-function-types.h"
> +#include "counter-strings.h"
> +#include "counter-sysfs-callbacks.h"
> +
> +#define to_counter_attribute(_dev_attr) \
> + container_of(_dev_attr, struct counter_attribute, dev_attr)
> +
> +static ssize_t counter_data_bool_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_bool_read count_bool_read = a->data.read;
> + const counter_device_bool_read device_bool_read = a->data.read;
> + const counter_signal_bool_read signal_bool_read = a->data.read;

That's not pretty. Try my union suggestion, then all of the functions
will be typed in the first place.

> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;

Skip having a local copy of a->owner as code will shorter and easier
to follow without.

> + int err = 0;
> + bool data;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + err = count_bool_read(counter, owner, &data);
> + break;
> + case COUNTER_OWNER_TYPE_DEVICE:
> + err = device_bool_read(counter, &data);
> + break;
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + err = signal_bool_read(counter, owner, &data);
> + break;

As this stands any value of a->type not listed returns no error.

> + }
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%u\n", (unsigned int)data);
> +}
> +
> +static ssize_t counter_data_bool_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_bool_write count_bool_write = a->data.write;
> + const counter_device_bool_write device_bool_write = a->data.write;
> + const counter_signal_bool_write signal_bool_write = a->data.write;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;
> + int err;
> + bool data;
> +
> + err = kstrtobool(buf, &data);
> + if (err)
> + return err;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + err = count_bool_write(counter, owner, data);
> + break;
> + case COUNTER_OWNER_TYPE_DEVICE:
> + err = device_bool_write(counter, data);
> + break;
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + err = signal_bool_write(counter, owner, data);
> + break;
default:
return -EINVAL;

> + }
> + if (err)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_lu_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_lu_read count_lu_read = a->data.read;
> + const counter_device_lu_read device_lu_read = a->data.read;
> + const counter_signal_lu_read signal_lu_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;
> + int err = 0;
> + unsigned long data;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + err = count_lu_read(counter, owner, &data);
> + break;
> + case COUNTER_OWNER_TYPE_DEVICE:
> + err = device_lu_read(counter, &data);
> + break;
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + err = signal_lu_read(counter, owner, &data);
> + break;
> + }
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%lu\n", data);
> +}
> +
> +static ssize_t counter_data_lu_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_lu_write count_lu_write = a->data.write;
> + const counter_device_lu_write device_lu_write = a->data.write;
> + const counter_signal_lu_write signal_lu_write = a->data.write;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;
> + int err;
> + unsigned long data;
> +
> + err = kstrtoul(buf, 0, &data);
> + if (err)
> + return err;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + err = count_lu_write(counter, owner, data);
> + break;
> + case COUNTER_OWNER_TYPE_DEVICE:
> + err = device_lu_write(counter, data);
> + break;
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + err = signal_lu_write(counter, owner, data);
> + break;
> + }
> + if (err)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_zu_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_device_zu_read zu_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + int err;
> + size_t data;
> +
> + err = zu_read(counter, &data);
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%zu\n", data);
> +}
> +
> +static ssize_t counter_data_s_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_s_read count_s_read = a->data.read;
> + const counter_device_s_read device_s_read = a->data.read;
> + const counter_signal_s_read signal_s_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + return count_s_read(counter, owner, buf, PAGE_SIZE);
> + case COUNTER_OWNER_TYPE_DEVICE:
> + return device_s_read(counter, buf, PAGE_SIZE);
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + return signal_s_read(counter, owner, buf, PAGE_SIZE);
> + }
> +
> + return -EINVAL;
> +}
> +
> +static ssize_t counter_data_s_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_s_write count_s_write = a->data.write;
> + const counter_device_s_write device_s_write = a->data.write;
> + const counter_signal_s_write signal_s_write = a->data.write;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + return count_s_write(counter, owner, buf, len);
> + case COUNTER_OWNER_TYPE_DEVICE:
> + return device_s_write(counter, buf, len);
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + return signal_s_write(counter, owner, buf, len);
> + }
> +
> + return -EINVAL;
> +}
> +
> +static ssize_t counter_data_count_function_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_function_read function_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->owner;
> + int err;
> + enum counter_count_function function;
> +
> + err = function_read(counter, count, &function);
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%s\n", counter_count_function_str[function]);
> +}
> +
> +static ssize_t counter_data_count_function_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_function_write function_write = a->data.write;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->owner;
> + const size_t num_functions = count->num_functions;
> + int err;
> + size_t index;
> + enum counter_count_function function;
> +
> + /* Find requested function mode */
> + for (index = 0; index < num_functions; index++) {
> + function = count->functions_list[index];
> + if (sysfs_streq(buf, counter_count_function_str[function]))
> + break;
> + }
> + /* If requested function mode not found */
> + if (index >= num_functions)
> + return -EINVAL;
> +
> + err = function_write(counter, count, function);
> + if (err)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_count_function_available_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const struct counter_count *const count = a->owner;
> + size_t i;
> + enum counter_count_function function;
> + ssize_t len = 0;
> +
> + for (i = 0; i < count->num_functions; i++) {
> + function = count->functions_list[i];
> + len += sprintf(buf + len, "%s\n",
> + counter_count_function_str[function]);
> + }
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_signal_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_signal_signal_read signal_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_signal *const signal = a->owner;
> + int err;
> + enum counter_signal_value value;
> +
> + err = signal_read(counter, signal, &value);
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%s\n", counter_signal_value_str[value]);
> +}
> +
> +static ssize_t counter_data_synapse_action_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_synapse_action_read action_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->owner;
> + struct counter_synapse *const synapse = a->data.priv;
> + int err;
> + enum counter_synapse_action action;
> +
> + err = action_read(counter, count, synapse, &action);
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%s\n", counter_synapse_action_str[action]);
> +}
> +
> +static ssize_t counter_data_synapse_action_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_synapse_action_write action_write = a->data.write;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->owner;
> + struct counter_synapse *const synapse = a->data.priv;
> + const size_t num_actions = synapse->num_actions;
> + int err;
> + size_t index;
> + enum counter_synapse_action action;
> +
> + /* Find requested action mode */
> + for (index = 0; index < num_actions; index++) {
> + action = synapse->actions_list[index];
> + if (sysfs_streq(buf, counter_synapse_action_str[action]))
> + break;
> + }
> + /* If requested action mode not found */
> + if (index >= num_actions)
> + return -EINVAL;
> +
> + err = action_write(counter, count, synapse, action);
> + if (err)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_synapse_action_available_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const struct counter_synapse *const synapse = a->data.priv;
> + size_t i;
> + enum counter_synapse_action action;
> + ssize_t len = 0;
> +
> + for (i = 0; i < synapse->num_actions; i++) {
> + action = synapse->actions_list[i];
> + len += sprintf(buf + len, "%s\n",
> + counter_synapse_action_str[action]);
> + }
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_enum_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_zu_read count_enum_read = a->data.read;
> + const counter_device_zu_read device_enum_read = a->data.read;
> + const counter_signal_zu_read signal_enum_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;
> + struct counter_enum *const cntr_enum = a->data.priv;
> + int err = 0;
> + size_t index;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + err = count_enum_read(counter, owner, &index);
> + break;
> + case COUNTER_OWNER_TYPE_DEVICE:
> + err = device_enum_read(counter, &index);
> + break;
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + err = signal_enum_read(counter, owner, &index);
> + break;
> + }
> + if (err)
> + return err;
> +
> + if (index >= cntr_enum->num_items)
> + return -EINVAL;
> +
> + return sprintf(buf, "%s\n", cntr_enum->items[index]);
> +}
> +
> +static ssize_t counter_data_enum_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_enum *const cntr_enum = a->data.priv;
> + const size_t num_items = cntr_enum->num_items;
> + const counter_count_zu_write count_enum_write = a->data.write;
> + const counter_device_zu_write device_enum_write = a->data.write;
> + const counter_signal_zu_write signal_enum_write = a->data.write;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + void *const owner = a->owner;
> + ssize_t index;
> + int err = 0;
> +
> + index = __sysfs_match_string(cntr_enum->items, num_items, buf);
> + if (index < 0)
> + return index;
> +
> + switch (a->type) {
> + case COUNTER_OWNER_TYPE_COUNT:
> + err = count_enum_write(counter, owner, index);
> + break;
> + case COUNTER_OWNER_TYPE_DEVICE:
> + err = device_enum_write(counter, index);
> + break;
> + case COUNTER_OWNER_TYPE_SIGNAL:
> + err = signal_enum_write(counter, owner, index);
> + break;
> + }
> + if (err)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_enum_available_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + struct counter_enum *const cntr_enum = a->data.priv;
> + size_t i;
> + size_t len = 0;
> +
> + for (i = 0; i < cntr_enum->num_items; i++)
> + len += sprintf(buf + len, "%s\n", cntr_enum->items[i]);
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_count_direction_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_direction_read direction_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->owner;
> + int err;
> + enum counter_count_direction direction;
> +
> + err = direction_read(counter, count, &direction);
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%s\n", counter_count_direction_str[direction]);
> +}
> +
> +static ssize_t counter_data_count_mode_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_mode_read count_mode_read = a->data.read;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->owner;
> + int err;
> + enum counter_count_mode count_mode;
> +
> + err = count_mode_read(counter, count, &count_mode);
> + if (err)
> + return err;
> +
> + return sprintf(buf, "%s\n", counter_count_mode_str[count_mode]);
> +}
> +
> +static ssize_t counter_data_count_mode_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const counter_count_mode_write count_mode_write = a->data.write;
> + struct counter_device *const counter = dev_get_drvdata(dev);
> + struct counter_count *const count = a->owner;
> + const struct counter_available *const available = a->data.priv;
> + const enum counter_count_mode *const items = available->items;
> + const size_t num_count_modes = available->num_items;
> + int err;
> + size_t index;
> + enum counter_count_mode count_mode;
> +
> + /* Find requested count mode */
> + for (index = 0; index < num_count_modes; index++) {
> + count_mode = items[index];
> + if (sysfs_streq(buf, counter_count_mode_str[count_mode]))
> + break;
> + }
> + /* If requested count mode not found */
> + if (index >= num_count_modes)
> + return -EINVAL;
> +
> + err = count_mode_write(counter, count, count_mode);
> + if (err)
> + return err;
> +
> + return len;
> +}
> +
> +static ssize_t counter_data_count_mode_available_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + const struct counter_attribute *const a = to_counter_attribute(attr);
> + const struct counter_available *const available = a->data.priv;
> + const enum counter_count_mode *const items = available->items;
> + size_t i;
> + enum counter_count_mode count_mode;
> + ssize_t len = 0;
> +
> + for (i = 0; i < available->num_items; i++) {
> + count_mode = items[i];
> + len += sprintf(buf + len, "%s\n",
> + counter_count_mode_str[count_mode]);
> + }
> +
> + return len;
> +}
> +
> +ssize_t (*counter_data_sysfs_show[])(struct device *, struct device_attribute *,
> + char *) = {
> + [COUNTER_DATA_TYPE_BOOL] = counter_data_bool_show,
> + [COUNTER_DATA_TYPE_UNSIGNED_LONG] = counter_data_lu_show,
> + [COUNTER_DATA_TYPE_SIZE] = counter_data_zu_show,
> + [COUNTER_DATA_TYPE_STRING] = counter_data_s_show,
> + [COUNTER_DATA_TYPE_COUNT_FUNCTION] = counter_data_count_function_show,
> + [COUNTER_DATA_TYPE_COUNT_FUNCTION_AVAILABLE] = counter_data_count_function_available_show,
> + [COUNTER_DATA_TYPE_SIGNAL] = counter_data_signal_show,
> + [COUNTER_DATA_TYPE_SYNAPSE_ACTION] = counter_data_synapse_action_show,
> + [COUNTER_DATA_TYPE_SYNAPSE_ACTION_AVAILABLE] = counter_data_synapse_action_available_show,
> + [COUNTER_DATA_TYPE_ENUM] = counter_data_enum_show,
> + [COUNTER_DATA_TYPE_ENUM_AVAILABLE] = counter_data_enum_available_show,
> + [COUNTER_DATA_TYPE_COUNT_DIRECTION] = counter_data_count_direction_show,
> + [COUNTER_DATA_TYPE_COUNT_MODE] = counter_data_count_mode_show,
> + [COUNTER_DATA_TYPE_COUNT_MODE_AVAILABLE] = counter_data_count_mode_available_show,
> +};
> +
> +ssize_t (*counter_data_sysfs_store[])(struct device *,
> + struct device_attribute *, const char *,
> + size_t) = {
> + [COUNTER_DATA_TYPE_BOOL] = counter_data_bool_store,
> + [COUNTER_DATA_TYPE_UNSIGNED_LONG] = counter_data_lu_store,
> + [COUNTER_DATA_TYPE_SIZE] = NULL,
> + [COUNTER_DATA_TYPE_STRING] = counter_data_s_store,
> + [COUNTER_DATA_TYPE_COUNT_FUNCTION] = counter_data_count_function_store,
> + [COUNTER_DATA_TYPE_COUNT_FUNCTION_AVAILABLE] = NULL,
> + [COUNTER_DATA_TYPE_SIGNAL] = NULL,
> + [COUNTER_DATA_TYPE_SYNAPSE_ACTION] = counter_data_synapse_action_store,
> + [COUNTER_DATA_TYPE_SYNAPSE_ACTION_AVAILABLE] = NULL,
> + [COUNTER_DATA_TYPE_ENUM] = counter_data_enum_store,
> + [COUNTER_DATA_TYPE_ENUM_AVAILABLE] = NULL,
> + [COUNTER_DATA_TYPE_COUNT_DIRECTION] = NULL,
> + [COUNTER_DATA_TYPE_COUNT_MODE] = counter_data_count_mode_store,
> + [COUNTER_DATA_TYPE_COUNT_MODE_AVAILABLE] = NULL,
> +};
> diff --git a/drivers/counter/counter-sysfs-callbacks.h b/drivers/counter/counter-sysfs-callbacks.h
> new file mode 100644
> index 000000000000..cf44e7c6ed18
> --- /dev/null
> +++ b/drivers/counter/counter-sysfs-callbacks.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Generic Counter sysfs callbacks
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#ifndef _COUNTER_SYSFS_CALLBACKS_H_
> +#define _COUNTER_SYSFS_CALLBACKS_H_
> +
> +#include <linux/counter.h>
> +#include <linux/types.h>
> +
> +struct counter_attribute {
> + struct device_attribute dev_attr;
> + struct list_head l;
> +
> + struct counter_data data;
> + enum counter_owner_type type;
> + void *owner;
> +};
> +
> +extern ssize_t (*counter_data_sysfs_show[])(struct device *,
> + struct device_attribute *, char *);
> +
> +extern ssize_t (*counter_data_sysfs_store[])(struct device *,
> + struct device_attribute *,
> + const char *, size_t);
> +
> +#endif /* _COUNTER_SYSFS_CALLBACKS_H_ */
> diff --git a/drivers/counter/counter-sysfs.c b/drivers/counter/counter-sysfs.c
> new file mode 100644
> index 000000000000..ed56c6b52490
> --- /dev/null
> +++ b/drivers/counter/counter-sysfs.c
> @@ -0,0 +1,524 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Generic Counter sysfs interface
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#include <linux/counter.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/gfp.h>
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/slab.h>
> +#include <linux/sysfs.h>
> +#include <linux/types.h>
> +
> +#include "counter-sysfs-callbacks.h"
> +
> +static int counter_attribute_create(struct counter_attribute_group *const group,
> + const struct counter_data *const data,
> + const enum counter_owner_type type,
> + void *const owner)
> +{
> + struct counter_attribute *counter_attr;
> + struct device_attribute *dev_attr;
> +
> + /* Allocate and initialize Counter attribute */
> + counter_attr = kzalloc(sizeof(*counter_attr), GFP_KERNEL);
> + if (!counter_attr)
> + return -ENOMEM;
> + counter_attr->data = *data;
> + counter_attr->type = type;
> + counter_attr->owner = owner;
> +
> + /* Configure device attribute */
> + dev_attr = &counter_attr->dev_attr;
> + sysfs_attr_init(&dev_attr->attr);
> + dev_attr->attr.name = data->name;
> + if (data->read) {
> + dev_attr->attr.mode |= 0444;
> + dev_attr->show = counter_data_sysfs_show[data->type];
> + }
> + if (data->write) {
> + dev_attr->attr.mode |= 0200;
> + dev_attr->store = counter_data_sysfs_store[data->type];
> + }
> +
> + /* Keep track of the attribute for later cleanup */
> + list_add(&counter_attr->l, &group->attr_list);
> + group->num_attr++;
> +
> + return 0;
> +}
> +
> +static struct counter_data counter_signal_data = {
> + .type = COUNTER_DATA_TYPE_SIGNAL,
> + .name = "signal",
> +};
> +
> +static struct counter_data counter_name_data =
> + COUNTER_DATA_STRING("name", NULL, NULL);
> +
> +static ssize_t counter_signal_name_read(struct counter_device *counter,
> + struct counter_signal *signal,
> + char *buf, size_t size)
> +{
> + return snprintf(buf, size, "%s\n", signal->name);
> +}
> +
> +static int counter_signal_attributes_create(
> + struct counter_attribute_group *const group,
> + struct counter_signal *const signal, void *const signal_read)
> +{
> + const enum counter_owner_type type = COUNTER_OWNER_TYPE_SIGNAL;
> + int err;
> + struct counter_data data;
> + size_t i;
> + const struct counter_data *ext;
> +
> + /* Create main Signal attribute */
> + data = counter_signal_data;
> + data.read = signal_read;
> + err = counter_attribute_create(group, &data, type, signal);
> + if (err)
> + return err;
> +
> + /* Create Signal name attribute */
> + data = counter_name_data;
> + data.read = counter_signal_name_read;
> + err = counter_attribute_create(group, &data, type, signal);
> + if (err)
> + return err;
> +
> + /* Create an attribute for each extension */
> + for (i = 0; i < signal->num_ext; i++) {
> + ext = signal->ext + i;
> + err = counter_attribute_create(group, ext, type, signal);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int counter_signals_register(
> + struct counter_attribute_group *const groups_list,
> + const struct counter_device *const counter)
> +{
> + void *const signal_read = counter->signal_read;
> + size_t i;
> + struct counter_signal *signal;
> + const char *name;
> + int err;
> +
> + /* Register each Signal */
> + for (i = 0; i < counter->num_signals; i++) {
> + signal = counter->signals + i;
> +
> + /* Generate Signal attribute directory name */
> + name = kasprintf(GFP_KERNEL, "signal%d", signal->id);
> + if (!name)
> + return -ENOMEM;
> + groups_list[i].attr_group.name = name;
> +
> + /* Create all attributes associated with Signal */
> + err = counter_signal_attributes_create(groups_list + i, signal,
> + signal_read);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +struct counter_synapse_name {
> + struct list_head l;
> + const char *name;
> +};
> +
> +static int counter_synapses_register(
> + struct counter_attribute_group *const group,
> + struct counter_device *const counter, struct counter_count *const count)
> +{
> + const enum counter_owner_type type = COUNTER_OWNER_TYPE_COUNT;
> + size_t i;
> + struct counter_synapse *synapse;
> + int id;
> + struct counter_synapse_name *name;
> + struct counter_data data;
> + int err;
> +
> + /* Register each Synapse */
> + for (i = 0; i < count->num_synapses; i++) {
> + synapse = count->synapses + i;
> + id = synapse->signal->id;
> +
> + /* Generate Synapse name list item */
> + name = kmalloc(sizeof(*name), GFP_KERNEL);
> + if (!name)
> + return -ENOMEM;
> + list_add(&name->l, &counter->synapse_names_list);
> +
> + /* Generate Synapse action name */
> + name->name = kasprintf(GFP_KERNEL, "signal%d_action", id);
> + if (!name->name)
> + return -ENOMEM;
> +
> + /* Create action attribute */
> + data.type = COUNTER_DATA_TYPE_SYNAPSE_ACTION;
> + data.name = name->name;
> + data.read = counter->action_read;
> + data.write = counter->action_write;
> + data.priv = synapse;
> + err = counter_attribute_create(group, &data, type, count);
> + if (err)
> + return err;
> +
> + /* Generate Synapse action_available name */
> + name->name = kasprintf(GFP_KERNEL, "signal%d_action_available",
> + id);
> + if (!name->name)
> + return -ENOMEM;
> +
> + /* Create action_available attribute */
> + data.type = COUNTER_DATA_TYPE_SYNAPSE_ACTION_AVAILABLE;
> + data.name = name->name;
> + data.read = counter->action_read;
> + data.priv = synapse;
> + err = counter_attribute_create(group, &data, type, count);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static struct counter_data counter_count_data =
> + COUNTER_DATA_UNSIGNED_LONG("count", NULL, NULL);
> +
> +static ssize_t counter_count_name_read(struct counter_device *counter,
> + struct counter_count *count, char *buf,
> + size_t size)
> +{
> + return snprintf(buf, size, "%s\n", count->name);
> +}
> +
> +static struct counter_data counter_count_function_data = {
> + .type = COUNTER_DATA_TYPE_COUNT_FUNCTION,
> + .name = "function",
> +};
> +
> +static struct counter_data counter_count_function_available_data = {
> + .type = COUNTER_DATA_TYPE_COUNT_FUNCTION_AVAILABLE,
> + .name = "function_available",
> +};
> +
> +static int counter_count_attributes_create(
> + struct counter_attribute_group *const group,
> + const struct counter_device *const counter,
> + struct counter_count *const count)
> +{
> + const enum counter_owner_type type = COUNTER_OWNER_TYPE_COUNT;
> + int err;
> + struct counter_data data;
> + size_t i;
> + const struct counter_data *ext;
> +
> + /* Create main Count attribute */
> + data = counter_count_data;
> + data.read = counter->count_read;
> + data.write = counter->count_write;
> + err = counter_attribute_create(group, &data, type, count);
> + if (err)
> + return err;
> +
> + /* Create Count name attribute */
> + data = counter_name_data;
> + data.read = counter_count_name_read;
> + err = counter_attribute_create(group, &data, type, count);
> + if (err)
> + return err;
> +
> + /* Create Count function attribute */
> + data = counter_count_function_data;
> + data.read = counter->function_read;
> + data.write = counter->function_write;
> + err = counter_attribute_create(group, &data, type, count);
> + if (err)
> + return err;
> +
> + /* Create Count function_available attribute */
> + data = counter_count_function_available_data;
> + data.read = counter->function_read;
> + err = counter_attribute_create(group, &data, type, count);
> + if (err)
> + return err;
> +
> + /* Create an attribute for each extension */
> + for (i = 0; i < count->num_ext; i++) {
> + ext = count->ext + i;
> + err = counter_attribute_create(group, ext, type, count);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int counter_counts_register(
> + struct counter_attribute_group *const groups_list,
> + struct counter_device *const counter)
> +{
> + size_t i;
> + struct counter_count *count;
> + const char *name;
> + int err;
> +
> + /* Register each Count */
> + for (i = 0; i < counter->num_counts; i++) {
> + count = counter->counts + i;
> +
> + /* Generate Count attribute directory name */
> + name = kasprintf(GFP_KERNEL, "count%d", count->id);
> + if (!name)
> + return -ENOMEM;
> + groups_list[i].attr_group.name = name;
> +
> + /* Register the Synapses associated with each Count */
> + err = counter_synapses_register(groups_list + i, counter,
> + count);
> + if (err)
> + return err;
> +
> + /* Create all attributes associated with Count */
> + err = counter_count_attributes_create(groups_list + i, counter,
> + count);
> + if (err)
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static ssize_t counter_name_read(struct counter_device *counter, char *buf,
> + size_t size)
> +{
> + return snprintf(buf, size, "%s\n", counter->name);
> +}
> +
> +static int counter_num_signals_read(struct counter_device *counter, size_t *val)
> +{
> + *val = counter->num_signals;
> + return 0;
> +}
> +
> +static int counter_num_counts_read(struct counter_device *counter, size_t *val)
> +{
> + *val = counter->num_counts;
> + return 0;
> +}
> +
> +#define COUNTER_DATA_SIZE(_name, _read) \
> +{ \
> + .type = COUNTER_DATA_TYPE_SIZE, \
> + .name = (_name), \
> + .read = (_read), \
> +}
> +
> +static struct counter_data counter_num_signals_data =
> + COUNTER_DATA_SIZE("num_signals", counter_num_signals_read);
> +
> +static struct counter_data counter_num_counts_data =
> + COUNTER_DATA_SIZE("num_counts", counter_num_counts_read);
> +
> +static void counter_groups_list_free(struct counter_device *const counter)
> +{
> + struct counter_attribute_group *group;
> + struct counter_attribute *p, *n;
> +
> + /* Loop through all attribute groups (signals, counts, device, etc.) */
> + while (counter->num_groups--) {
> + group = counter->groups_list + counter->num_groups;
> +
> + /* Free all attribute group and associated attributes memory */
> + kfree(group->attr_group.name);
> + kfree(group->attr_group.attrs);
> +
> + /* Free attribute list */
> + list_for_each_entry_safe(p, n, &group->attr_list, l)
> + kfree(p);
> + }
> +
> + kfree(counter->groups_list);
> +}
> +
> +static int counter_device_register(struct counter_attribute_group *group,
> + struct counter_device *const counter)
> +{
> + const enum counter_owner_type type = COUNTER_OWNER_TYPE_DEVICE;
> + struct counter_data data;
> + int err;
> + size_t i;
> + const struct counter_data *ext;
> +
> + /* Register Signals */
> + err = counter_signals_register(group, counter);
> + if (err)
> + goto err_free_groups_list;
> + group += counter->num_signals;
> +
> + /* Register Counts and respective Synapses */
> + err = counter_counts_register(group, counter);
> + if (err)
> + goto err_free_groups_list;
> + group += counter->num_counts;
> +
> + /* Create name attribute */
> + data = counter_name_data;
> + data.read = counter_name_read;
> + err = counter_attribute_create(group, &data, type, NULL);
> + if (err)
> + goto err_free_groups_list;
> +
> + /* Create num_signals attribute */
> + data = counter_num_signals_data;
> + err = counter_attribute_create(group, &data, type, NULL);
> + if (err)
> + goto err_free_groups_list;
> +
> + /* Create num_counts attribute */
> + data = counter_num_counts_data;
> + err = counter_attribute_create(group, &data, type, NULL);
> + if (err)
> + goto err_free_groups_list;
> +
> + /* Create an attribute for each extension */
> + for (i = 0; i < counter->num_ext; i++) {
> + ext = counter->ext + i;
> + err = counter_attribute_create(group, ext, type, NULL);
> + if (err)
> + goto err_free_groups_list;
> + }
> +
> + return 0;
> +
> +err_free_groups_list:
> + counter_groups_list_free(counter);
> + return err;
> +}
> +
> +static int counter_groups_list_prepare(struct counter_device *const counter)
> +{
> + const size_t num_grps = counter->num_signals + counter->num_counts + 1;
> + struct counter_attribute_group *groups_list;
> + size_t i;
> + int err;
> +
> + /* Allocate space for attribute groups (signals, counts, and ext) */
> + groups_list = kcalloc(num_grps, sizeof(*groups_list), GFP_KERNEL);
> + if (!groups_list)
> + return -ENOMEM;
> +
> + /* Store groups_list in counter structure */
> + counter->groups_list = groups_list;
> + counter->num_groups = num_grps;
> +
> + /* Initialize attribute lists */
> + for (i = 0; i < num_grps; i++)
> + INIT_LIST_HEAD(&groups_list[i].attr_list);
> +
> + /* Register Counter device attributes */
> + err = counter_device_register(groups_list, counter);
> + if (err)
> + return err;

return counter_device_register...

> +
> + return 0;
> +}
> +
> +static int counter_groups_prepare(struct counter_device *const counter)
> +{
> + size_t i, j;
> + struct counter_attribute_group *group;
> + struct attribute **attrs;
> + int err;
> + struct counter_attribute *p;
> +
> + /* Allocate attribute groups for association with device */
> + counter->groups = kcalloc(counter->num_groups + 1,
> + sizeof(*counter->groups), GFP_KERNEL);
> + if (!counter->groups)
> + return -ENOMEM;
> +
> + /* Prepare each group of attributes for association */
> + for (i = 0; i < counter->num_groups; i++) {
> + group = counter->groups_list + i;
> +
> + /* Allocate space for attribute pointers */
> + attrs = kcalloc(group->num_attr + 1, sizeof(*attrs),
> + GFP_KERNEL);
> + if (!attrs) {
> + err = -ENOMEM;
> + goto err_free_groups;
> + }
> + group->attr_group.attrs = attrs;
> +
> + /* Add attribute pointers to attribute group */
> + j = 0;
> + list_for_each_entry(p, &group->attr_list, l)
> + attrs[j++] = &p->dev_attr.attr;
> +
> + /* Group attributes in attribute group */
> + counter->groups[i] = &group->attr_group;
> + }
> + /* Associate attributes with device */
> + counter->dev.groups = counter->groups;
> +
> + return 0;
> +
> +err_free_groups:
> + kfree(counter->groups);
> + return err;
> +}
> +
> +static void counter_synapse_names_free(struct list_head *const names_list)
> +{
> + struct counter_synapse_name *p, *n;
> +
> + list_for_each_entry_safe(p, n, names_list, l) {
> + kfree(p->name);
> + kfree(p);
> + }
> +}
> +
> +int counter_sysfs_add(struct counter_device *const counter)
> +{
> + int err;
> +
> + /* Initialize Synapse names list */
> + INIT_LIST_HEAD(&counter->synapse_names_list);
> +
> + /* Prepare device attributes */
> + err = counter_groups_list_prepare(counter);
> + if (err)
> + goto err_free_synapse_names;
> +
> + /* Organize device attributes to groups and match to device */
> + err = counter_groups_prepare(counter);
> + if (err)
> + goto err_free_groups_list;
> +
> + return 0;
> +
> +err_free_groups_list:
> + counter_groups_list_free(counter);
> +err_free_synapse_names:
> + counter_synapse_names_free(&counter->synapse_names_list);
> + return err;
> +}
> +
> +void counter_sysfs_free(struct counter_device *const counter)
> +{
> + kfree(counter->groups);
> + counter_groups_list_free(counter);
> + counter_synapse_names_free(&counter->synapse_names_list);
> +}
> diff --git a/drivers/counter/counter-sysfs.h b/drivers/counter/counter-sysfs.h
> new file mode 100644
> index 000000000000..00e7cd6ea083
> --- /dev/null
> +++ b/drivers/counter/counter-sysfs.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Counter sysfs interface
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#ifndef _COUNTER_SYSFS_H_
> +#define _COUNTER_SYSFS_H_
> +
> +#include <linux/counter.h>
> +
> +int counter_sysfs_add(struct counter_device *const counter);
> +void counter_sysfs_free(struct counter_device *const counter);
> +
> +#endif /* _COUNTER_SYSFS_H_ */
> diff --git a/drivers/counter/counter.c b/drivers/counter/counter.c
> deleted file mode 100644
> index 6a683d086008..000000000000
> --- a/drivers/counter/counter.c
> +++ /dev/null
> @@ -1,1496 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0
> -/*
> - * Generic Counter interface
> - * Copyright (C) 2018 William Breathitt Gray
> - */
> -#include <linux/counter.h>
> -#include <linux/device.h>
> -#include <linux/err.h>
> -#include <linux/export.h>
> -#include <linux/fs.h>
> -#include <linux/gfp.h>
> -#include <linux/idr.h>
> -#include <linux/init.h>
> -#include <linux/kernel.h>
> -#include <linux/list.h>
> -#include <linux/module.h>
> -#include <linux/printk.h>
> -#include <linux/slab.h>
> -#include <linux/string.h>
> -#include <linux/sysfs.h>
> -#include <linux/types.h>
> -
> -const char *const counter_count_direction_str[2] = {
> - [COUNTER_COUNT_DIRECTION_FORWARD] = "forward",
> - [COUNTER_COUNT_DIRECTION_BACKWARD] = "backward"
> -};
> -EXPORT_SYMBOL_GPL(counter_count_direction_str);
> -
> -const char *const counter_count_mode_str[4] = {
> - [COUNTER_COUNT_MODE_NORMAL] = "normal",
> - [COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit",
> - [COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle",
> - [COUNTER_COUNT_MODE_MODULO_N] = "modulo-n"
> -};
> -EXPORT_SYMBOL_GPL(counter_count_mode_str);
> -
> -ssize_t counter_signal_enum_read(struct counter_device *counter,
> - struct counter_signal *signal, void *priv,
> - char *buf)
> -{
> - const struct counter_signal_enum_ext *const e = priv;
> - int err;
> - size_t index;
> -
> - if (!e->get)
> - return -EINVAL;
> -
> - err = e->get(counter, signal, &index);
> - if (err)
> - return err;
> -
> - if (index >= e->num_items)
> - return -EINVAL;
> -
> - return sprintf(buf, "%s\n", e->items[index]);
> -}
> -EXPORT_SYMBOL_GPL(counter_signal_enum_read);
> -
> -ssize_t counter_signal_enum_write(struct counter_device *counter,
> - struct counter_signal *signal, void *priv,
> - const char *buf, size_t len)
> -{
> - const struct counter_signal_enum_ext *const e = priv;
> - ssize_t index;
> - int err;
> -
> - if (!e->set)
> - return -EINVAL;
> -
> - index = __sysfs_match_string(e->items, e->num_items, buf);
> - if (index < 0)
> - return index;
> -
> - err = e->set(counter, signal, index);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_signal_enum_write);
> -
> -ssize_t counter_signal_enum_available_read(struct counter_device *counter,
> - struct counter_signal *signal,
> - void *priv, char *buf)
> -{
> - const struct counter_signal_enum_ext *const e = priv;
> - size_t i;
> - size_t len = 0;
> -
> - if (!e->num_items)
> - return 0;
> -
> - for (i = 0; i < e->num_items; i++)
> - len += sprintf(buf + len, "%s\n", e->items[i]);
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_signal_enum_available_read);
> -
> -ssize_t counter_count_enum_read(struct counter_device *counter,
> - struct counter_count *count, void *priv,
> - char *buf)
> -{
> - const struct counter_count_enum_ext *const e = priv;
> - int err;
> - size_t index;
> -
> - if (!e->get)
> - return -EINVAL;
> -
> - err = e->get(counter, count, &index);
> - if (err)
> - return err;
> -
> - if (index >= e->num_items)
> - return -EINVAL;
> -
> - return sprintf(buf, "%s\n", e->items[index]);
> -}
> -EXPORT_SYMBOL_GPL(counter_count_enum_read);
> -
> -ssize_t counter_count_enum_write(struct counter_device *counter,
> - struct counter_count *count, void *priv,
> - const char *buf, size_t len)
> -{
> - const struct counter_count_enum_ext *const e = priv;
> - ssize_t index;
> - int err;
> -
> - if (!e->set)
> - return -EINVAL;
> -
> - index = __sysfs_match_string(e->items, e->num_items, buf);
> - if (index < 0)
> - return index;
> -
> - err = e->set(counter, count, index);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_count_enum_write);
> -
> -ssize_t counter_count_enum_available_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, char *buf)
> -{
> - const struct counter_count_enum_ext *const e = priv;
> - size_t i;
> - size_t len = 0;
> -
> - if (!e->num_items)
> - return 0;
> -
> - for (i = 0; i < e->num_items; i++)
> - len += sprintf(buf + len, "%s\n", e->items[i]);
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_count_enum_available_read);
> -
> -ssize_t counter_device_enum_read(struct counter_device *counter, void *priv,
> - char *buf)
> -{
> - const struct counter_device_enum_ext *const e = priv;
> - int err;
> - size_t index;
> -
> - if (!e->get)
> - return -EINVAL;
> -
> - err = e->get(counter, &index);
> - if (err)
> - return err;
> -
> - if (index >= e->num_items)
> - return -EINVAL;
> -
> - return sprintf(buf, "%s\n", e->items[index]);
> -}
> -EXPORT_SYMBOL_GPL(counter_device_enum_read);
> -
> -ssize_t counter_device_enum_write(struct counter_device *counter, void *priv,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_enum_ext *const e = priv;
> - ssize_t index;
> - int err;
> -
> - if (!e->set)
> - return -EINVAL;
> -
> - index = __sysfs_match_string(e->items, e->num_items, buf);
> - if (index < 0)
> - return index;
> -
> - err = e->set(counter, index);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_device_enum_write);
> -
> -ssize_t counter_device_enum_available_read(struct counter_device *counter,
> - void *priv, char *buf)
> -{
> - const struct counter_device_enum_ext *const e = priv;
> - size_t i;
> - size_t len = 0;
> -
> - if (!e->num_items)
> - return 0;
> -
> - for (i = 0; i < e->num_items; i++)
> - len += sprintf(buf + len, "%s\n", e->items[i]);
> -
> - return len;
> -}
> -EXPORT_SYMBOL_GPL(counter_device_enum_available_read);
> -
> -struct counter_attr_parm {
> - struct counter_device_attr_group *group;
> - const char *prefix;
> - const char *name;
> - ssize_t (*show)(struct device *dev, struct device_attribute *attr,
> - char *buf);
> - ssize_t (*store)(struct device *dev, struct device_attribute *attr,
> - const char *buf, size_t len);
> - void *component;
> -};
> -
> -struct counter_device_attr {
> - struct device_attribute dev_attr;
> - struct list_head l;
> - void *component;
> -};
> -
> -static int counter_attribute_create(const struct counter_attr_parm *const parm)
> -{
> - struct counter_device_attr *counter_attr;
> - struct device_attribute *dev_attr;
> - int err;
> - struct list_head *const attr_list = &parm->group->attr_list;
> -
> - /* Allocate a Counter device attribute */
> - counter_attr = kzalloc(sizeof(*counter_attr), GFP_KERNEL);
> - if (!counter_attr)
> - return -ENOMEM;
> - dev_attr = &counter_attr->dev_attr;
> -
> - sysfs_attr_init(&dev_attr->attr);
> -
> - /* Configure device attribute */
> - dev_attr->attr.name = kasprintf(GFP_KERNEL, "%s%s", parm->prefix,
> - parm->name);
> - if (!dev_attr->attr.name) {
> - err = -ENOMEM;
> - goto err_free_counter_attr;
> - }
> - if (parm->show) {
> - dev_attr->attr.mode |= 0444;
> - dev_attr->show = parm->show;
> - }
> - if (parm->store) {
> - dev_attr->attr.mode |= 0200;
> - dev_attr->store = parm->store;
> - }
> -
> - /* Store associated Counter component with attribute */
> - counter_attr->component = parm->component;
> -
> - /* Keep track of the attribute for later cleanup */
> - list_add(&counter_attr->l, attr_list);
> - parm->group->num_attr++;
> -
> - return 0;
> -
> -err_free_counter_attr:
> - kfree(counter_attr);
> - return err;
> -}
> -
> -#define to_counter_attr(_dev_attr) \
> - container_of(_dev_attr, struct counter_device_attr, dev_attr)
> -
> -struct counter_signal_unit {
> - struct counter_signal *signal;
> -};
> -
> -static const char *const counter_signal_value_str[] = {
> - [COUNTER_SIGNAL_LOW] = "low",
> - [COUNTER_SIGNAL_HIGH] = "high"
> -};
> -
> -static ssize_t counter_signal_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_signal_unit *const component = devattr->component;
> - struct counter_signal *const signal = component->signal;
> - int err;
> - enum counter_signal_value val;
> -
> - err = counter->ops->signal_read(counter, signal, &val);
> - if (err)
> - return err;
> -
> - return sprintf(buf, "%s\n", counter_signal_value_str[val]);
> -}
> -
> -struct counter_name_unit {
> - const char *name;
> -};
> -
> -static ssize_t counter_device_attr_name_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - const struct counter_name_unit *const comp = to_counter_attr(attr)->component;
> -
> - return sprintf(buf, "%s\n", comp->name);
> -}
> -
> -static int counter_name_attribute_create(
> - struct counter_device_attr_group *const group,
> - const char *const name)
> -{
> - struct counter_name_unit *name_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Skip if no name */
> - if (!name)
> - return 0;
> -
> - /* Allocate name attribute component */
> - name_comp = kmalloc(sizeof(*name_comp), GFP_KERNEL);
> - if (!name_comp)
> - return -ENOMEM;
> - name_comp->name = name;
> -
> - /* Allocate Signal name attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "name";
> - parm.show = counter_device_attr_name_show;
> - parm.store = NULL;
> - parm.component = name_comp;
> - err = counter_attribute_create(&parm);
> - if (err)
> - goto err_free_name_comp;
> -
> - return 0;
> -
> -err_free_name_comp:
> - kfree(name_comp);
> - return err;
> -}
> -
> -struct counter_signal_ext_unit {
> - struct counter_signal *signal;
> - const struct counter_signal_ext *ext;
> -};
> -
> -static ssize_t counter_signal_ext_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_signal_ext_unit *const comp = devattr->component;
> - const struct counter_signal_ext *const ext = comp->ext;
> -
> - return ext->read(dev_get_drvdata(dev), comp->signal, ext->priv, buf);
> -}
> -
> -static ssize_t counter_signal_ext_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_signal_ext_unit *const comp = devattr->component;
> - const struct counter_signal_ext *const ext = comp->ext;
> -
> - return ext->write(dev_get_drvdata(dev), comp->signal, ext->priv, buf,
> - len);
> -}
> -
> -static void counter_device_attr_list_free(struct list_head *attr_list)
> -{
> - struct counter_device_attr *p, *n;
> -
> - list_for_each_entry_safe(p, n, attr_list, l) {
> - /* free attribute name and associated component memory */
> - kfree(p->dev_attr.attr.name);
> - kfree(p->component);
> - list_del(&p->l);
> - kfree(p);
> - }
> -}
> -
> -static int counter_signal_ext_register(
> - struct counter_device_attr_group *const group,
> - struct counter_signal *const signal)
> -{
> - const size_t num_ext = signal->num_ext;
> - size_t i;
> - const struct counter_signal_ext *ext;
> - struct counter_signal_ext_unit *signal_ext_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Create an attribute for each extension */
> - for (i = 0 ; i < num_ext; i++) {
> - ext = signal->ext + i;
> -
> - /* Allocate signal_ext attribute component */
> - signal_ext_comp = kmalloc(sizeof(*signal_ext_comp), GFP_KERNEL);
> - if (!signal_ext_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - signal_ext_comp->signal = signal;
> - signal_ext_comp->ext = ext;
> -
> - /* Allocate a Counter device attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = ext->name;
> - parm.show = (ext->read) ? counter_signal_ext_show : NULL;
> - parm.store = (ext->write) ? counter_signal_ext_store : NULL;
> - parm.component = signal_ext_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(signal_ext_comp);
> - goto err_free_attr_list;
> - }
> - }
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_signal_attributes_create(
> - struct counter_device_attr_group *const group,
> - const struct counter_device *const counter,
> - struct counter_signal *const signal)
> -{
> - struct counter_signal_unit *signal_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Allocate Signal attribute component */
> - signal_comp = kmalloc(sizeof(*signal_comp), GFP_KERNEL);
> - if (!signal_comp)
> - return -ENOMEM;
> - signal_comp->signal = signal;
> -
> - /* Create main Signal attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "signal";
> - parm.show = (counter->ops->signal_read) ? counter_signal_show : NULL;
> - parm.store = NULL;
> - parm.component = signal_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(signal_comp);
> - return err;
> - }
> -
> - /* Create Signal name attribute */
> - err = counter_name_attribute_create(group, signal->name);
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Register Signal extension attributes */
> - err = counter_signal_ext_register(group, signal);
> - if (err)
> - goto err_free_attr_list;
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_signals_register(
> - struct counter_device_attr_group *const groups_list,
> - const struct counter_device *const counter)
> -{
> - const size_t num_signals = counter->num_signals;
> - size_t i;
> - struct counter_signal *signal;
> - const char *name;
> - int err;
> -
> - /* Register each Signal */
> - for (i = 0; i < num_signals; i++) {
> - signal = counter->signals + i;
> -
> - /* Generate Signal attribute directory name */
> - name = kasprintf(GFP_KERNEL, "signal%d", signal->id);
> - if (!name) {
> - err = -ENOMEM;
> - goto err_free_attr_groups;
> - }
> - groups_list[i].attr_group.name = name;
> -
> - /* Create all attributes associated with Signal */
> - err = counter_signal_attributes_create(groups_list + i, counter,
> - signal);
> - if (err)
> - goto err_free_attr_groups;
> - }
> -
> - return 0;
> -
> -err_free_attr_groups:
> - do {
> - kfree(groups_list[i].attr_group.name);
> - counter_device_attr_list_free(&groups_list[i].attr_list);
> - } while (i--);
> - return err;
> -}
> -
> -static const char *const counter_synapse_action_str[] = {
> - [COUNTER_SYNAPSE_ACTION_NONE] = "none",
> - [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = "rising edge",
> - [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = "falling edge",
> - [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = "both edges"
> -};
> -
> -struct counter_action_unit {
> - struct counter_synapse *synapse;
> - struct counter_count *count;
> -};
> -
> -static ssize_t counter_action_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_action_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - struct counter_synapse *const synapse = component->synapse;
> - size_t action_index;
> - enum counter_synapse_action action;
> -
> - err = counter->ops->action_get(counter, count, synapse, &action_index);
> - if (err)
> - return err;
> -
> - synapse->action = action_index;
> -
> - action = synapse->actions_list[action_index];
> - return sprintf(buf, "%s\n", counter_synapse_action_str[action]);
> -}
> -
> -static ssize_t counter_action_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_action_unit *const component = devattr->component;
> - struct counter_synapse *const synapse = component->synapse;
> - size_t action_index;
> - const size_t num_actions = synapse->num_actions;
> - enum counter_synapse_action action;
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - struct counter_count *const count = component->count;
> -
> - /* Find requested action mode */
> - for (action_index = 0; action_index < num_actions; action_index++) {
> - action = synapse->actions_list[action_index];
> - if (sysfs_streq(buf, counter_synapse_action_str[action]))
> - break;
> - }
> - /* If requested action mode not found */
> - if (action_index >= num_actions)
> - return -EINVAL;
> -
> - err = counter->ops->action_set(counter, count, synapse, action_index);
> - if (err)
> - return err;
> -
> - synapse->action = action_index;
> -
> - return len;
> -}
> -
> -struct counter_action_avail_unit {
> - const enum counter_synapse_action *actions_list;
> - size_t num_actions;
> -};
> -
> -static ssize_t counter_synapse_action_available_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_action_avail_unit *const component = devattr->component;
> - size_t i;
> - enum counter_synapse_action action;
> - ssize_t len = 0;
> -
> - for (i = 0; i < component->num_actions; i++) {
> - action = component->actions_list[i];
> - len += sprintf(buf + len, "%s\n",
> - counter_synapse_action_str[action]);
> - }
> -
> - return len;
> -}
> -
> -static int counter_synapses_register(
> - struct counter_device_attr_group *const group,
> - const struct counter_device *const counter,
> - struct counter_count *const count, const char *const count_attr_name)
> -{
> - size_t i;
> - struct counter_synapse *synapse;
> - const char *prefix;
> - struct counter_action_unit *action_comp;
> - struct counter_attr_parm parm;
> - int err;
> - struct counter_action_avail_unit *avail_comp;
> -
> - /* Register each Synapse */
> - for (i = 0; i < count->num_synapses; i++) {
> - synapse = count->synapses + i;
> -
> - /* Generate attribute prefix */
> - prefix = kasprintf(GFP_KERNEL, "signal%d_",
> - synapse->signal->id);
> - if (!prefix) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> -
> - /* Allocate action attribute component */
> - action_comp = kmalloc(sizeof(*action_comp), GFP_KERNEL);
> - if (!action_comp) {
> - err = -ENOMEM;
> - goto err_free_prefix;
> - }
> - action_comp->synapse = synapse;
> - action_comp->count = count;
> -
> - /* Create action attribute */
> - parm.group = group;
> - parm.prefix = prefix;
> - parm.name = "action";
> - parm.show = (counter->ops->action_get) ? counter_action_show : NULL;
> - parm.store = (counter->ops->action_set) ? counter_action_store : NULL;
> - parm.component = action_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(action_comp);
> - goto err_free_prefix;
> - }
> -
> - /* Allocate action available attribute component */
> - avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL);
> - if (!avail_comp) {
> - err = -ENOMEM;
> - goto err_free_prefix;
> - }
> - avail_comp->actions_list = synapse->actions_list;
> - avail_comp->num_actions = synapse->num_actions;
> -
> - /* Create action_available attribute */
> - parm.group = group;
> - parm.prefix = prefix;
> - parm.name = "action_available";
> - parm.show = counter_synapse_action_available_show;
> - parm.store = NULL;
> - parm.component = avail_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(avail_comp);
> - goto err_free_prefix;
> - }
> -
> - kfree(prefix);
> - }
> -
> - return 0;
> -
> -err_free_prefix:
> - kfree(prefix);
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -struct counter_count_unit {
> - struct counter_count *count;
> -};
> -
> -static ssize_t counter_count_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - int err;
> - unsigned long val;
> -
> - err = counter->ops->count_read(counter, count, &val);
> - if (err)
> - return err;
> -
> - return sprintf(buf, "%lu\n", val);
> -}
> -
> -static ssize_t counter_count_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - int err;
> - unsigned long val;
> -
> - err = kstrtoul(buf, 0, &val);
> - if (err)
> - return err;
> -
> - err = counter->ops->count_write(counter, count, val);
> - if (err)
> - return err;
> -
> - return len;
> -}
> -
> -static const char *const counter_count_function_str[] = {
> - [COUNTER_COUNT_FUNCTION_INCREASE] = "increase",
> - [COUNTER_COUNT_FUNCTION_DECREASE] = "decrease",
> - [COUNTER_COUNT_FUNCTION_PULSE_DIRECTION] = "pulse-direction",
> - [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A] = "quadrature x1 a",
> - [COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b",
> - [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a",
> - [COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b",
> - [COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4"
> -};
> -
> -static ssize_t counter_function_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - size_t func_index;
> - enum counter_count_function function;
> -
> - err = counter->ops->function_get(counter, count, &func_index);
> - if (err)
> - return err;
> -
> - count->function = func_index;
> -
> - function = count->functions_list[func_index];
> - return sprintf(buf, "%s\n", counter_count_function_str[function]);
> -}
> -
> -static ssize_t counter_function_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_unit *const component = devattr->component;
> - struct counter_count *const count = component->count;
> - const size_t num_functions = count->num_functions;
> - size_t func_index;
> - enum counter_count_function function;
> - int err;
> - struct counter_device *const counter = dev_get_drvdata(dev);
> -
> - /* Find requested Count function mode */
> - for (func_index = 0; func_index < num_functions; func_index++) {
> - function = count->functions_list[func_index];
> - if (sysfs_streq(buf, counter_count_function_str[function]))
> - break;
> - }
> - /* Return error if requested Count function mode not found */
> - if (func_index >= num_functions)
> - return -EINVAL;
> -
> - err = counter->ops->function_set(counter, count, func_index);
> - if (err)
> - return err;
> -
> - count->function = func_index;
> -
> - return len;
> -}
> -
> -struct counter_count_ext_unit {
> - struct counter_count *count;
> - const struct counter_count_ext *ext;
> -};
> -
> -static ssize_t counter_count_ext_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_ext_unit *const comp = devattr->component;
> - const struct counter_count_ext *const ext = comp->ext;
> -
> - return ext->read(dev_get_drvdata(dev), comp->count, ext->priv, buf);
> -}
> -
> -static ssize_t counter_count_ext_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_count_ext_unit *const comp = devattr->component;
> - const struct counter_count_ext *const ext = comp->ext;
> -
> - return ext->write(dev_get_drvdata(dev), comp->count, ext->priv, buf,
> - len);
> -}
> -
> -static int counter_count_ext_register(
> - struct counter_device_attr_group *const group,
> - struct counter_count *const count)
> -{
> - size_t i;
> - const struct counter_count_ext *ext;
> - struct counter_count_ext_unit *count_ext_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Create an attribute for each extension */
> - for (i = 0 ; i < count->num_ext; i++) {
> - ext = count->ext + i;
> -
> - /* Allocate count_ext attribute component */
> - count_ext_comp = kmalloc(sizeof(*count_ext_comp), GFP_KERNEL);
> - if (!count_ext_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - count_ext_comp->count = count;
> - count_ext_comp->ext = ext;
> -
> - /* Allocate count_ext attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = ext->name;
> - parm.show = (ext->read) ? counter_count_ext_show : NULL;
> - parm.store = (ext->write) ? counter_count_ext_store : NULL;
> - parm.component = count_ext_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(count_ext_comp);
> - goto err_free_attr_list;
> - }
> - }
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -struct counter_func_avail_unit {
> - const enum counter_count_function *functions_list;
> - size_t num_functions;
> -};
> -
> -static ssize_t counter_count_function_available_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_func_avail_unit *const component = devattr->component;
> - const enum counter_count_function *const func_list = component->functions_list;
> - const size_t num_functions = component->num_functions;
> - size_t i;
> - enum counter_count_function function;
> - ssize_t len = 0;
> -
> - for (i = 0; i < num_functions; i++) {
> - function = func_list[i];
> - len += sprintf(buf + len, "%s\n",
> - counter_count_function_str[function]);
> - }
> -
> - return len;
> -}
> -
> -static int counter_count_attributes_create(
> - struct counter_device_attr_group *const group,
> - const struct counter_device *const counter,
> - struct counter_count *const count)
> -{
> - struct counter_count_unit *count_comp;
> - struct counter_attr_parm parm;
> - int err;
> - struct counter_count_unit *func_comp;
> - struct counter_func_avail_unit *avail_comp;
> -
> - /* Allocate count attribute component */
> - count_comp = kmalloc(sizeof(*count_comp), GFP_KERNEL);
> - if (!count_comp)
> - return -ENOMEM;
> - count_comp->count = count;
> -
> - /* Create main Count attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "count";
> - parm.show = (counter->ops->count_read) ? counter_count_show : NULL;
> - parm.store = (counter->ops->count_write) ? counter_count_store : NULL;
> - parm.component = count_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(count_comp);
> - return err;
> - }
> -
> - /* Allocate function attribute component */
> - func_comp = kmalloc(sizeof(*func_comp), GFP_KERNEL);
> - if (!func_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - func_comp->count = count;
> -
> - /* Create Count function attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "function";
> - parm.show = (counter->ops->function_get) ? counter_function_show : NULL;
> - parm.store = (counter->ops->function_set) ? counter_function_store : NULL;
> - parm.component = func_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(func_comp);
> - goto err_free_attr_list;
> - }
> -
> - /* Allocate function available attribute component */
> - avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL);
> - if (!avail_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> - avail_comp->functions_list = count->functions_list;
> - avail_comp->num_functions = count->num_functions;
> -
> - /* Create Count function_available attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = "function_available";
> - parm.show = counter_count_function_available_show;
> - parm.store = NULL;
> - parm.component = avail_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(avail_comp);
> - goto err_free_attr_list;
> - }
> -
> - /* Create Count name attribute */
> - err = counter_name_attribute_create(group, count->name);
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Register Count extension attributes */
> - err = counter_count_ext_register(group, count);
> - if (err)
> - goto err_free_attr_list;
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_counts_register(
> - struct counter_device_attr_group *const groups_list,
> - const struct counter_device *const counter)
> -{
> - size_t i;
> - struct counter_count *count;
> - const char *name;
> - int err;
> -
> - /* Register each Count */
> - for (i = 0; i < counter->num_counts; i++) {
> - count = counter->counts + i;
> -
> - /* Generate Count attribute directory name */
> - name = kasprintf(GFP_KERNEL, "count%d", count->id);
> - if (!name) {
> - err = -ENOMEM;
> - goto err_free_attr_groups;
> - }
> - groups_list[i].attr_group.name = name;
> -
> - /* Register the Synapses associated with each Count */
> - err = counter_synapses_register(groups_list + i, counter, count,
> - name);
> - if (err)
> - goto err_free_attr_groups;
> -
> - /* Create all attributes associated with Count */
> - err = counter_count_attributes_create(groups_list + i, counter,
> - count);
> - if (err)
> - goto err_free_attr_groups;
> - }
> -
> - return 0;
> -
> -err_free_attr_groups:
> - do {
> - kfree(groups_list[i].attr_group.name);
> - counter_device_attr_list_free(&groups_list[i].attr_list);
> - } while (i--);
> - return err;
> -}
> -
> -struct counter_size_unit {
> - size_t size;
> -};
> -
> -static ssize_t counter_device_attr_size_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> -{
> - const struct counter_size_unit *const comp = to_counter_attr(attr)->component;
> -
> - return sprintf(buf, "%zu\n", comp->size);
> -}
> -
> -static int counter_size_attribute_create(
> - struct counter_device_attr_group *const group,
> - const size_t size, const char *const name)
> -{
> - struct counter_size_unit *size_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Allocate size attribute component */
> - size_comp = kmalloc(sizeof(*size_comp), GFP_KERNEL);
> - if (!size_comp)
> - return -ENOMEM;
> - size_comp->size = size;
> -
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = name;
> - parm.show = counter_device_attr_size_show;
> - parm.store = NULL;
> - parm.component = size_comp;
> - err = counter_attribute_create(&parm);
> - if (err)
> - goto err_free_size_comp;
> -
> - return 0;
> -
> -err_free_size_comp:
> - kfree(size_comp);
> - return err;
> -}
> -
> -struct counter_ext_unit {
> - const struct counter_device_ext *ext;
> -};
> -
> -static ssize_t counter_device_ext_show(struct device *dev,
> - struct device_attribute *attr, char *buf)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_ext_unit *const component = devattr->component;
> - const struct counter_device_ext *const ext = component->ext;
> -
> - return ext->read(dev_get_drvdata(dev), ext->priv, buf);
> -}
> -
> -static ssize_t counter_device_ext_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> -{
> - const struct counter_device_attr *const devattr = to_counter_attr(attr);
> - const struct counter_ext_unit *const component = devattr->component;
> - const struct counter_device_ext *const ext = component->ext;
> -
> - return ext->write(dev_get_drvdata(dev), ext->priv, buf, len);
> -}
> -
> -static int counter_device_ext_register(
> - struct counter_device_attr_group *const group,
> - struct counter_device *const counter)
> -{
> - size_t i;
> - struct counter_ext_unit *ext_comp;
> - struct counter_attr_parm parm;
> - int err;
> -
> - /* Create an attribute for each extension */
> - for (i = 0 ; i < counter->num_ext; i++) {
> - /* Allocate extension attribute component */
> - ext_comp = kmalloc(sizeof(*ext_comp), GFP_KERNEL);
> - if (!ext_comp) {
> - err = -ENOMEM;
> - goto err_free_attr_list;
> - }
> -
> - ext_comp->ext = counter->ext + i;
> -
> - /* Allocate extension attribute */
> - parm.group = group;
> - parm.prefix = "";
> - parm.name = counter->ext[i].name;
> - parm.show = (counter->ext[i].read) ? counter_device_ext_show : NULL;
> - parm.store = (counter->ext[i].write) ? counter_device_ext_store : NULL;
> - parm.component = ext_comp;
> - err = counter_attribute_create(&parm);
> - if (err) {
> - kfree(ext_comp);
> - goto err_free_attr_list;
> - }
> - }
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static int counter_global_attr_register(
> - struct counter_device_attr_group *const group,
> - struct counter_device *const counter)
> -{
> - int err;
> -
> - /* Create name attribute */
> - err = counter_name_attribute_create(group, counter->name);
> - if (err)
> - return err;
> -
> - /* Create num_counts attribute */
> - err = counter_size_attribute_create(group, counter->num_counts,
> - "num_counts");
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Create num_signals attribute */
> - err = counter_size_attribute_create(group, counter->num_signals,
> - "num_signals");
> - if (err)
> - goto err_free_attr_list;
> -
> - /* Register Counter device extension attributes */
> - err = counter_device_ext_register(group, counter);
> - if (err)
> - goto err_free_attr_list;
> -
> - return 0;
> -
> -err_free_attr_list:
> - counter_device_attr_list_free(&group->attr_list);
> - return err;
> -}
> -
> -static void counter_device_groups_list_free(
> - struct counter_device_attr_group *const groups_list,
> - const size_t num_groups)
> -{
> - struct counter_device_attr_group *group;
> - size_t i;
> -
> - /* loop through all attribute groups (signals, counts, global, etc.) */
> - for (i = 0; i < num_groups; i++) {
> - group = groups_list + i;
> -
> - /* free all attribute group and associated attributes memory */
> - kfree(group->attr_group.name);
> - kfree(group->attr_group.attrs);
> - counter_device_attr_list_free(&group->attr_list);
> - }
> -
> - kfree(groups_list);
> -}
> -
> -static int counter_device_groups_list_prepare(
> - struct counter_device *const counter)
> -{
> - const size_t total_num_groups =
> - counter->num_signals + counter->num_counts + 1;
> - struct counter_device_attr_group *groups_list;
> - size_t i;
> - int err;
> - size_t num_groups = 0;
> -
> - /* Allocate space for attribute groups (signals, counts, and ext) */
> - groups_list = kcalloc(total_num_groups, sizeof(*groups_list),
> - GFP_KERNEL);
> - if (!groups_list)
> - return -ENOMEM;
> -
> - /* Initialize attribute lists */
> - for (i = 0; i < total_num_groups; i++)
> - INIT_LIST_HEAD(&groups_list[i].attr_list);
> -
> - /* Register Signals */
> - err = counter_signals_register(groups_list, counter);
> - if (err)
> - goto err_free_groups_list;
> - num_groups += counter->num_signals;
> -
> - /* Register Counts and respective Synapses */
> - err = counter_counts_register(groups_list + num_groups, counter);
> - if (err)
> - goto err_free_groups_list;
> - num_groups += counter->num_counts;
> -
> - /* Register Counter global attributes */
> - err = counter_global_attr_register(groups_list + num_groups, counter);
> - if (err)
> - goto err_free_groups_list;
> - num_groups++;
> -
> - /* Store groups_list in device_state */
> - counter->device_state->groups_list = groups_list;
> - counter->device_state->num_groups = num_groups;
> -
> - return 0;
> -
> -err_free_groups_list:
> - counter_device_groups_list_free(groups_list, num_groups);
> - return err;
> -}
> -
> -static int counter_device_groups_prepare(
> - struct counter_device_state *const device_state)
> -{
> - size_t i, j;
> - struct counter_device_attr_group *group;
> - int err;
> - struct counter_device_attr *p;
> -
> - /* Allocate attribute groups for association with device */
> - device_state->groups = kcalloc(device_state->num_groups + 1,
> - sizeof(*device_state->groups),
> - GFP_KERNEL);
> - if (!device_state->groups)
> - return -ENOMEM;
> -
> - /* Prepare each group of attributes for association */
> - for (i = 0; i < device_state->num_groups; i++) {
> - group = device_state->groups_list + i;
> -
> - /* Allocate space for attribute pointers in attribute group */
> - group->attr_group.attrs = kcalloc(group->num_attr + 1,
> - sizeof(*group->attr_group.attrs), GFP_KERNEL);
> - if (!group->attr_group.attrs) {
> - err = -ENOMEM;
> - goto err_free_groups;
> - }
> -
> - /* Add attribute pointers to attribute group */
> - j = 0;
> - list_for_each_entry(p, &group->attr_list, l)
> - group->attr_group.attrs[j++] = &p->dev_attr.attr;
> -
> - /* Group attributes in attribute group */
> - device_state->groups[i] = &group->attr_group;
> - }
> - /* Associate attributes with device */
> - device_state->dev.groups = device_state->groups;
> -
> - return 0;
> -
> -err_free_groups:
> - do {
> - group = device_state->groups_list + i;
> - kfree(group->attr_group.attrs);
> - group->attr_group.attrs = NULL;
> - } while (i--);
> - kfree(device_state->groups);
> - return err;
> -}
> -
> -/* Provides a unique ID for each counter device */
> -static DEFINE_IDA(counter_ida);
> -
> -static void counter_device_release(struct device *dev)
> -{
> - struct counter_device *const counter = dev_get_drvdata(dev);
> - struct counter_device_state *const device_state = counter->device_state;
> -
> - kfree(device_state->groups);
> - counter_device_groups_list_free(device_state->groups_list,
> - device_state->num_groups);
> - ida_simple_remove(&counter_ida, device_state->id);
> - kfree(device_state);
> -}
> -
> -static struct device_type counter_device_type = {
> - .name = "counter_device",
> - .release = counter_device_release
> -};
> -
> -static struct bus_type counter_bus_type = {
> - .name = "counter"
> -};
> -
> -/**
> - * counter_register - register Counter to the system
> - * @counter: pointer to Counter to register
> - *
> - * This function registers a Counter to the system. A sysfs "counter" directory
> - * will be created and populated with sysfs attributes correlating with the
> - * Counter Signals, Synapses, and Counts respectively.
> - */
> -int counter_register(struct counter_device *const counter)
> -{
> - struct counter_device_state *device_state;
> - int err;
> -
> - /* Allocate internal state container for Counter device */
> - device_state = kzalloc(sizeof(*device_state), GFP_KERNEL);
> - if (!device_state)
> - return -ENOMEM;
> - counter->device_state = device_state;
> -
> - /* Acquire unique ID */
> - device_state->id = ida_simple_get(&counter_ida, 0, 0, GFP_KERNEL);
> - if (device_state->id < 0) {
> - err = device_state->id;
> - goto err_free_device_state;
> - }
> -
> - /* Configure device structure for Counter */
> - device_state->dev.type = &counter_device_type;
> - device_state->dev.bus = &counter_bus_type;
> - if (counter->parent) {
> - device_state->dev.parent = counter->parent;
> - device_state->dev.of_node = counter->parent->of_node;
> - }
> - dev_set_name(&device_state->dev, "counter%d", device_state->id);
> - device_initialize(&device_state->dev);
> - dev_set_drvdata(&device_state->dev, counter);
> -
> - /* Prepare device attributes */
> - err = counter_device_groups_list_prepare(counter);
> - if (err)
> - goto err_free_id;
> -
> - /* Organize device attributes to groups and match to device */
> - err = counter_device_groups_prepare(device_state);
> - if (err)
> - goto err_free_groups_list;
> -
> - /* Add device to system */
> - err = device_add(&device_state->dev);
> - if (err)
> - goto err_free_groups;
> -
> - return 0;
> -
> -err_free_groups:
> - kfree(device_state->groups);
> -err_free_groups_list:
> - counter_device_groups_list_free(device_state->groups_list,
> - device_state->num_groups);
> -err_free_id:
> - ida_simple_remove(&counter_ida, device_state->id);
> -err_free_device_state:
> - kfree(device_state);
> - return err;
> -}
> -EXPORT_SYMBOL_GPL(counter_register);
> -
> -/**
> - * counter_unregister - unregister Counter from the system
> - * @counter: pointer to Counter to unregister
> - *
> - * The Counter is unregistered from the system; all allocated memory is freed.
> - */
> -void counter_unregister(struct counter_device *const counter)
> -{
> - if (counter)
> - device_del(&counter->device_state->dev);
> -}
> -EXPORT_SYMBOL_GPL(counter_unregister);
> -
> -static void devm_counter_unreg(struct device *dev, void *res)
> -{
> - counter_unregister(*(struct counter_device **)res);
> -}
> -
> -/**
> - * devm_counter_register - Resource-managed counter_register
> - * @dev: device to allocate counter_device for
> - * @counter: pointer to Counter to register
> - *
> - * Managed counter_register. The Counter registered with this function is
> - * automatically unregistered on driver detach. This function calls
> - * counter_register internally. Refer to that function for more information.
> - *
> - * If an Counter registered with this function needs to be unregistered
> - * separately, devm_counter_unregister must be used.
> - *
> - * RETURNS:
> - * 0 on success, negative error number on failure.
> - */
> -int devm_counter_register(struct device *dev,
> - struct counter_device *const counter)
> -{
> - struct counter_device **ptr;
> - int ret;
> -
> - ptr = devres_alloc(devm_counter_unreg, sizeof(*ptr), GFP_KERNEL);
> - if (!ptr)
> - return -ENOMEM;
> -
> - ret = counter_register(counter);
> - if (!ret) {
> - *ptr = counter;
> - devres_add(dev, ptr);
> - } else {
> - devres_free(ptr);
> - }
> -
> - return ret;
> -}
> -EXPORT_SYMBOL_GPL(devm_counter_register);
> -
> -static int devm_counter_match(struct device *dev, void *res, void *data)
> -{
> - struct counter_device **r = res;
> -
> - if (!r || !*r) {
> - WARN_ON(!r || !*r);
> - return 0;
> - }
> -
> - return *r == data;
> -}
> -
> -/**
> - * devm_counter_unregister - Resource-managed counter_unregister
> - * @dev: device this counter_device belongs to
> - * @counter: pointer to Counter associated with the device
> - *
> - * Unregister Counter registered with devm_counter_register.
> - */
> -void devm_counter_unregister(struct device *dev,
> - struct counter_device *const counter)
> -{
> - int rc;
> -
> - rc = devres_release(dev, devm_counter_unreg, devm_counter_match,
> - counter);
> - WARN_ON(rc);
> -}
> -EXPORT_SYMBOL_GPL(devm_counter_unregister);
> -
> -static int __init counter_init(void)
> -{
> - return bus_register(&counter_bus_type);
> -}
> -
> -static void __exit counter_exit(void)
> -{
> - bus_unregister(&counter_bus_type);
> -}
> -
> -subsys_initcall(counter_init);
> -module_exit(counter_exit);
> -
> -MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@xxxxxxxxx>");
> -MODULE_DESCRIPTION("Generic Counter interface");
> -MODULE_LICENSE("GPL v2");
> diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c
> index c2b3fdfd8b77..450353f495a2 100644
> --- a/drivers/counter/ftm-quaddec.c
> +++ b/drivers/counter/ftm-quaddec.c
> @@ -151,29 +151,19 @@ static const char * const ftm_quaddec_prescaler[] = {
> "1", "2", "4", "8", "16", "32", "64", "128"
> };
>
> -static struct counter_count_enum_ext ftm_quaddec_prescaler_enum = {
> - .items = ftm_quaddec_prescaler,
> - .num_items = ARRAY_SIZE(ftm_quaddec_prescaler),
> - .get = ftm_quaddec_get_prescaler,
> - .set = ftm_quaddec_set_prescaler
> -};
> -
> -enum ftm_quaddec_synapse_action {
> - FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES,
> -};
> +static DEFINE_COUNTER_ENUM(ftm_quaddec_prescaler_enum, ftm_quaddec_prescaler);
>
> -static enum counter_synapse_action ftm_quaddec_synapse_actions[] = {
> - [FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES] =
> +static const enum counter_synapse_action ftm_quaddec_synapse_actions[] = {
> COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> };
>
> enum ftm_quaddec_count_function {
> - FTM_QUADDEC_COUNT_ENCODER_MODE_1,
> + FTM_QUADDEC_COUNT_ENCODER_MODE_1 =
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X4
> };
>
> static const enum counter_count_function ftm_quaddec_count_functions[] = {
> - [FTM_QUADDEC_COUNT_ENCODER_MODE_1] =
> - COUNTER_COUNT_FUNCTION_QUADRATURE_X4
> + FTM_QUADDEC_COUNT_ENCODER_MODE_1
> };
>
> static int ftm_quaddec_count_read(struct counter_device *counter,
> @@ -208,7 +198,7 @@ static int ftm_quaddec_count_write(struct counter_device *counter,
>
> static int ftm_quaddec_count_function_get(struct counter_device *counter,
> struct counter_count *count,
> - size_t *function)
> + enum counter_count_function *function)
> {
> *function = FTM_QUADDEC_COUNT_ENCODER_MODE_1;
>
> @@ -218,20 +208,13 @@ static int ftm_quaddec_count_function_get(struct counter_device *counter,
> static int ftm_quaddec_action_get(struct counter_device *counter,
> struct counter_count *count,
> struct counter_synapse *synapse,
> - size_t *action)
> + enum counter_synapse_action *action)
> {
> - *action = FTM_QUADDEC_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
>
> return 0;
> }
>
> -static const struct counter_ops ftm_quaddec_cnt_ops = {
> - .count_read = ftm_quaddec_count_read,
> - .count_write = ftm_quaddec_count_write,
> - .function_get = ftm_quaddec_count_function_get,
> - .action_get = ftm_quaddec_action_get,
> -};
> -
> static struct counter_signal ftm_quaddec_signals[] = {
> {
> .id = 0,
> @@ -256,9 +239,11 @@ static struct counter_synapse ftm_quaddec_count_synapses[] = {
> }
> };
>
> -static const struct counter_count_ext ftm_quaddec_count_ext[] = {
> - COUNTER_COUNT_ENUM("prescaler", &ftm_quaddec_prescaler_enum),
> - COUNTER_COUNT_ENUM_AVAILABLE("prescaler", &ftm_quaddec_prescaler_enum),
> +static struct counter_data ftm_quaddec_count_ext[] = {
> + COUNTER_DATA_ENUM_AND_AVAILABLE("prescaler",
> + ftm_quaddec_get_prescaler,
> + ftm_quaddec_set_prescaler,
> + ftm_quaddec_prescaler_enum),
> };
>
> static struct counter_count ftm_quaddec_counts = {
> @@ -302,7 +287,10 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
> }
> ftm->counter.name = dev_name(&pdev->dev);
> ftm->counter.parent = &pdev->dev;
> - ftm->counter.ops = &ftm_quaddec_cnt_ops;
> + ftm->counter.count_read = ftm_quaddec_count_read;
> + ftm->counter.count_write = ftm_quaddec_count_write;
> + ftm->counter.function_read = ftm_quaddec_count_function_get;
> + ftm->counter.action_read = ftm_quaddec_action_get;
> ftm->counter.counts = &ftm_quaddec_counts;
> ftm->counter.num_counts = 1;
> ftm->counter.signals = ftm_quaddec_signals;
> diff --git a/drivers/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c
> index 8e276eb655f5..53ca88533831 100644
> --- a/drivers/counter/stm32-lptimer-cnt.c
> +++ b/drivers/counter/stm32-lptimer-cnt.c
> @@ -352,30 +352,44 @@ static const struct iio_chan_spec stm32_lptim_cnt_channels = {
> * @STM32_LPTIM_ENCODER_BOTH_EDGE: count on both edges (IN1 & IN2 quadrature)
> */
> enum stm32_lptim_cnt_function {
> - STM32_LPTIM_COUNTER_INCREASE,
> - STM32_LPTIM_ENCODER_BOTH_EDGE,
> + STM32_LPTIM_COUNTER_INCREASE = COUNTER_COUNT_FUNCTION_INCREASE,
> + STM32_LPTIM_ENCODER_BOTH_EDGE = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
> };
>
> static enum counter_count_function stm32_lptim_cnt_functions[] = {
> - [STM32_LPTIM_COUNTER_INCREASE] = COUNTER_COUNT_FUNCTION_INCREASE,
> - [STM32_LPTIM_ENCODER_BOTH_EDGE] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
> + STM32_LPTIM_COUNTER_INCREASE,
> + STM32_LPTIM_ENCODER_BOTH_EDGE,
> };
>
> enum stm32_lptim_synapse_action {
> + /* Index must match with stm32_lptim_cnt_polarity[] (priv->polarity) */
> STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE,
> STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE,
> STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES,
> STM32_LPTIM_SYNAPSE_ACTION_NONE,
> };
>
> -static enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = {
> - /* Index must match with stm32_lptim_cnt_polarity[] (priv->polarity) */
> +static const enum stm32_lptim_synapse_action stm32_lptim_c2l_actions_map[] = {
> + [COUNTER_SYNAPSE_ACTION_RISING_EDGE] = STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE,
> + [COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE,
> + [COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES,
> + [COUNTER_SYNAPSE_ACTION_NONE] = STM32_LPTIM_SYNAPSE_ACTION_NONE,
> +};
> +
> +static const enum counter_synapse_action stm32_lptim_l2c_actions_map[] = {
> [STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> [STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE] = COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> [STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> [STM32_LPTIM_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> };
>
> +static const enum counter_synapse_action stm32_lptim_cnt_synapse_actions[] = {
> + stm32_lptim_l2c_actions_map[STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE],
> + stm32_lptim_l2c_actions_map[STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE],
> + stm32_lptim_l2c_actions_map[STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES],
> + stm32_lptim_l2c_actions_map[STM32_LPTIM_SYNAPSE_ACTION_NONE],
> +};
> +
> static int stm32_lptim_cnt_read(struct counter_device *counter,
> struct counter_count *count, unsigned long *val)
> {
> @@ -394,7 +408,7 @@ static int stm32_lptim_cnt_read(struct counter_device *counter,
>
> static int stm32_lptim_cnt_function_get(struct counter_device *counter,
> struct counter_count *count,
> - size_t *function)
> + enum counter_count_function *function)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
>
> @@ -413,7 +427,7 @@ static int stm32_lptim_cnt_function_get(struct counter_device *counter,
>
> static int stm32_lptim_cnt_function_set(struct counter_device *counter,
> struct counter_count *count,
> - size_t function)
> + enum counter_count_function function)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
>
> @@ -423,19 +437,20 @@ static int stm32_lptim_cnt_function_set(struct counter_device *counter,
> switch (function) {
> case STM32_LPTIM_COUNTER_INCREASE:
> priv->quadrature_mode = 0;
> - return 0;
> + break;
> case STM32_LPTIM_ENCODER_BOTH_EDGE:
> priv->quadrature_mode = 1;
> priv->polarity = STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES;
> - return 0;
> + break;
> + default: return -EINVAL;
> }
>
> - return -EINVAL;
> + return 0;
> }
>
> -static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_lptim_cnt_enable_read(struct counter_device *counter,
> + struct counter_count *count,
> + bool *enable)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> int ret;
> @@ -444,22 +459,18 @@ static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter,
> if (ret < 0)
> return ret;
>
> - return scnprintf(buf, PAGE_SIZE, "%u\n", ret);
> + *enable = ret;
> +
> + return 0;
> }
>
> -static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_lptim_cnt_enable_write(struct counter_device *counter,
> + struct counter_count *count,
> + bool enable)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> - bool enable;
> int ret;
>
> - ret = kstrtobool(buf, &enable);
> - if (ret)
> - return ret;
> -
> /* Check nobody uses the timer, or already disabled/enabled */
> ret = stm32_lptim_is_enabled(priv);
> if ((ret < 0) || (!ret && !enable))
> @@ -475,48 +486,51 @@ static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter,
> if (ret)
> return ret;
>
> - return len;
> + return 0;
> }
>
> -static ssize_t stm32_lptim_cnt_ceiling_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_lptim_cnt_ceiling_read(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long *ceiling)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
>
> - return stm32_lptim_cnt_get_ceiling(priv, buf);
> + *ceiling = priv->ceiling;
> +
> + return 0;
> }
>
> -static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long ceiling)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
>
> - return stm32_lptim_cnt_set_ceiling(priv, buf, len);
> + if (stm32_lptim_is_enabled(priv))
> + return -EBUSY;
> +
> + priv->ceiling = ceiling;
> +
> + if (ceiling > STM32_LPTIM_MAX_ARR)
> + return -EINVAL;
> +
> + return 0;
> }
>
> -static const struct counter_count_ext stm32_lptim_cnt_ext[] = {
> - {
> - .name = "enable",
> - .read = stm32_lptim_cnt_enable_read,
> - .write = stm32_lptim_cnt_enable_write
> - },
> - {
> - .name = "ceiling",
> - .read = stm32_lptim_cnt_ceiling_read,
> - .write = stm32_lptim_cnt_ceiling_write
> - },
> +static struct counter_data stm32_lptim_cnt_ext[] = {
> + COUNTER_DATA_ENABLE(stm32_lptim_cnt_enable_read,
> + stm32_lptim_cnt_enable_write),
> + COUNTER_DATA_CEILING(stm32_lptim_cnt_ceiling_read,
> + stm32_lptim_cnt_ceiling_write),
> };
>
> static int stm32_lptim_cnt_action_get(struct counter_device *counter,
> struct counter_count *count,
> struct counter_synapse *synapse,
> - size_t *action)
> + enum counter_synapse_action *action)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> - size_t function;
> + enum counter_count_function function;
> int err;
>
> err = stm32_lptim_cnt_function_get(counter, count, &function);
> @@ -527,25 +541,27 @@ static int stm32_lptim_cnt_action_get(struct counter_device *counter,
> case STM32_LPTIM_COUNTER_INCREASE:
> /* LP Timer acts as up-counter on input 1 */
> if (synapse->signal->id == count->synapses[0].signal->id)
> - *action = priv->polarity;
> + *action = stm32_lptim_l2c_actions_map[priv->polarity];
> else
> - *action = STM32_LPTIM_SYNAPSE_ACTION_NONE;
> - return 0;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> + break;
> case STM32_LPTIM_ENCODER_BOTH_EDGE:
> - *action = priv->polarity;
> - return 0;
> + *action = stm32_lptim_l2c_actions_map[priv->polarity];
> + break;
> + default: return -EINVAL;
> }
>
> - return -EINVAL;
> + return 0;
> }
>
> static int stm32_lptim_cnt_action_set(struct counter_device *counter,
> struct counter_count *count,
> struct counter_synapse *synapse,
> - size_t action)
> + enum counter_synapse_action action)
> {
> struct stm32_lptim_cnt *const priv = counter->priv;
> - size_t function;
> + enum counter_count_function function;
> + enum stm32_lptim_cnt_function cnt_function;
> int err;
>
> if (stm32_lptim_is_enabled(priv))
> @@ -554,29 +570,18 @@ static int stm32_lptim_cnt_action_set(struct counter_device *counter,
> err = stm32_lptim_cnt_function_get(counter, count, &function);
> if (err)
> return err;
> + cnt_function = function;
>
> /* only set polarity when in counter mode (on input 1) */
> - if (function == STM32_LPTIM_COUNTER_INCREASE
> - && synapse->signal->id == count->synapses[0].signal->id) {
> - switch (action) {
> - case STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE:
> - case STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE:
> - case STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES:
> - priv->polarity = action;
> - return 0;
> - }
> - }
> + if (cnt_function != STM32_LPTIM_COUNTER_INCREASE
> + || synapse->signal->id != count->synapses[0].signal->id
> + || action == COUNTER_SYNAPSE_ACTION_NONE)
> + return -EINVAL;
>
> - return -EINVAL;
> -}
> + priv->polarity = stm32_lptim_c2l_actions_map[action];
>
> -static const struct counter_ops stm32_lptim_cnt_ops = {
> - .count_read = stm32_lptim_cnt_read,
> - .function_get = stm32_lptim_cnt_function_get,
> - .function_set = stm32_lptim_cnt_function_set,
> - .action_get = stm32_lptim_cnt_action_get,
> - .action_set = stm32_lptim_cnt_action_set,
> -};
> + return 0;
> +}
>
> static struct counter_signal stm32_lptim_cnt_signals[] = {
> {
> @@ -660,7 +665,11 @@ static int stm32_lptim_cnt_probe(struct platform_device *pdev)
> /* Initialize Counter device */
> priv->counter.name = dev_name(&pdev->dev);
> priv->counter.parent = &pdev->dev;
> - priv->counter.ops = &stm32_lptim_cnt_ops;
> + priv->counter.count_read = stm32_lptim_cnt_read;
> + priv->counter.function_read = stm32_lptim_cnt_function_get;
> + priv->counter.function_write = stm32_lptim_cnt_function_set;
> + priv->counter.action_read = stm32_lptim_cnt_action_get;
> + priv->counter.action_write = stm32_lptim_cnt_action_set;
> if (ddata->has_encoder) {
> priv->counter.counts = &stm32_lptim_enc_counts;
> priv->counter.num_signals = ARRAY_SIZE(stm32_lptim_cnt_signals);
> diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
> index ef2a974a2f10..09e87cf79ce9 100644
> --- a/drivers/counter/stm32-timer-cnt.c
> +++ b/drivers/counter/stm32-timer-cnt.c
> @@ -45,17 +45,17 @@ struct stm32_timer_cnt {
> */
> enum stm32_count_function {
> STM32_COUNT_SLAVE_MODE_DISABLED = -1,
> + STM32_COUNT_ENCODER_MODE_1 = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
> + STM32_COUNT_ENCODER_MODE_2 = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B,
> + STM32_COUNT_ENCODER_MODE_3 = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
> +};
> +
> +static const enum counter_count_function stm32_count_functions[] = {
> STM32_COUNT_ENCODER_MODE_1,
> STM32_COUNT_ENCODER_MODE_2,
> STM32_COUNT_ENCODER_MODE_3,
> };
>
> -static enum counter_count_function stm32_count_functions[] = {
> - [STM32_COUNT_ENCODER_MODE_1] = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
> - [STM32_COUNT_ENCODER_MODE_2] = COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B,
> - [STM32_COUNT_ENCODER_MODE_3] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
> -};
> -
> static int stm32_count_read(struct counter_device *counter,
> struct counter_count *count, unsigned long *val)
> {
> @@ -82,7 +82,7 @@ static int stm32_count_write(struct counter_device *counter,
>
> static int stm32_count_function_get(struct counter_device *counter,
> struct counter_count *count,
> - size_t *function)
> + enum counter_count_function *function)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 smcr;
> @@ -106,7 +106,7 @@ static int stm32_count_function_get(struct counter_device *counter,
>
> static int stm32_count_function_set(struct counter_device *counter,
> struct counter_count *count,
> - size_t function)
> + enum counter_count_function function)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 cr1, sms;
> @@ -146,78 +146,66 @@ static int stm32_count_function_set(struct counter_device *counter,
> return 0;
> }
>
> -static ssize_t stm32_count_direction_read(struct counter_device *counter,
> +static int stm32_count_direction_read(struct counter_device *counter,
> struct counter_count *count,
> - void *private, char *buf)
> + enum counter_count_direction *direction)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> - const char *direction;
> u32 cr1;
>
> regmap_read(priv->regmap, TIM_CR1, &cr1);
> - direction = (cr1 & TIM_CR1_DIR) ? "backward" : "forward";
> + *direction = (cr1 & TIM_CR1_DIR) ? COUNTER_COUNT_DIRECTION_BACKWARD :
> + COUNTER_COUNT_DIRECTION_FORWARD;
>
> - return scnprintf(buf, PAGE_SIZE, "%s\n", direction);
> + return 0;
> }
>
> -static ssize_t stm32_count_ceiling_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_count_ceiling_read(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long *ceiling)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 arr;
>
> regmap_read(priv->regmap, TIM_ARR, &arr);
>
> - return snprintf(buf, PAGE_SIZE, "%u\n", arr);
> + *ceiling = arr;
> +
> + return 0;
> }
>
> -static ssize_t stm32_count_ceiling_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_count_ceiling_write(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long ceiling)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> - unsigned int ceiling;
> - int ret;
> -
> - ret = kstrtouint(buf, 0, &ceiling);
> - if (ret)
> - return ret;
>
> /* TIMx_ARR register shouldn't be buffered (ARPE=0) */
> regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_ARPE, 0);
> regmap_write(priv->regmap, TIM_ARR, ceiling);
>
> priv->ceiling = ceiling;
> - return len;
> + return 0;
> }
>
> -static ssize_t stm32_count_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *private, char *buf)
> +static int stm32_count_enable_read(struct counter_device *counter,
> + struct counter_count *count, bool *enable)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> u32 cr1;
>
> regmap_read(priv->regmap, TIM_CR1, &cr1);
>
> - return scnprintf(buf, PAGE_SIZE, "%d\n", (bool)(cr1 & TIM_CR1_CEN));
> + *enable = cr1 & TIM_CR1_CEN;
> +
> + return 0;
> }
>
> -static ssize_t stm32_count_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *private,
> - const char *buf, size_t len)
> +static int stm32_count_enable_write(struct counter_device *counter,
> + struct counter_count *count, bool enable)
> {
> struct stm32_timer_cnt *const priv = counter->priv;
> - int err;
> u32 cr1;
> - bool enable;
> -
> - err = kstrtobool(buf, &enable);
> - if (err)
> - return err;
>
> if (enable) {
> regmap_read(priv->regmap, TIM_CR1, &cr1);
> @@ -236,46 +224,31 @@ static ssize_t stm32_count_enable_write(struct counter_device *counter,
> /* Keep enabled state to properly handle low power states */
> priv->enabled = enable;
>
> - return len;
> + return 0;
> }
>
> -static const struct counter_count_ext stm32_count_ext[] = {
> - {
> - .name = "direction",
> - .read = stm32_count_direction_read,
> - },
> - {
> - .name = "enable",
> - .read = stm32_count_enable_read,
> - .write = stm32_count_enable_write
> - },
> - {
> - .name = "ceiling",
> - .read = stm32_count_ceiling_read,
> - .write = stm32_count_ceiling_write
> - },
> -};
> -
> -enum stm32_synapse_action {
> - STM32_SYNAPSE_ACTION_NONE,
> - STM32_SYNAPSE_ACTION_BOTH_EDGES
> +static struct counter_data stm32_count_ext[] = {
> + COUNTER_DATA_DIRECTION(stm32_count_direction_read),
> + COUNTER_DATA_ENABLE(stm32_count_enable_read, stm32_count_enable_write),
> + COUNTER_DATA_CEILING(stm32_count_ceiling_read,
> + stm32_count_ceiling_write),
> };
>
> -static enum counter_synapse_action stm32_synapse_actions[] = {
> - [STM32_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> - [STM32_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> +static const enum counter_synapse_action stm32_synapse_actions[] = {
> + COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> };
>
> static int stm32_action_get(struct counter_device *counter,
> struct counter_count *count,
> struct counter_synapse *synapse,
> - size_t *action)
> + enum counter_synapse_action *action)
> {
> - size_t function;
> + enum counter_count_function function;
> int err;
>
> /* Default action mode (e.g. STM32_COUNT_SLAVE_MODE_DISABLED) */
> - *action = STM32_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
>
> err = stm32_count_function_get(counter, count, &function);
> if (err)
> @@ -285,30 +258,23 @@ static int stm32_action_get(struct counter_device *counter,
> case STM32_COUNT_ENCODER_MODE_1:
> /* counts up/down on TI1FP1 edge depending on TI2FP2 level */
> if (synapse->signal->id == count->synapses[0].signal->id)
> - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> break;
> case STM32_COUNT_ENCODER_MODE_2:
> /* counts up/down on TI2FP2 edge depending on TI1FP1 level */
> if (synapse->signal->id == count->synapses[1].signal->id)
> - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> break;
> case STM32_COUNT_ENCODER_MODE_3:
> /* counts up/down on both TI1FP1 and TI2FP2 edges */
> - *action = STM32_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> break;
> + default: return -EINVAL;
> }
>
> return 0;
> }
>
> -static const struct counter_ops stm32_timer_cnt_ops = {
> - .count_read = stm32_count_read,
> - .count_write = stm32_count_write,
> - .function_get = stm32_count_function_get,
> - .function_set = stm32_count_function_set,
> - .action_get = stm32_action_get,
> -};
> -
> static struct counter_signal stm32_signals[] = {
> {
> .id = 0,
> @@ -363,7 +329,11 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev)
>
> priv->counter.name = dev_name(dev);
> priv->counter.parent = dev;
> - priv->counter.ops = &stm32_timer_cnt_ops;
> + priv->counter.count_read = stm32_count_read;
> + priv->counter.count_write = stm32_count_write;
> + priv->counter.function_read = stm32_count_function_get;
> + priv->counter.function_write = stm32_count_function_set;
> + priv->counter.action_read = stm32_action_get;
> priv->counter.counts = &stm32_counts;
> priv->counter.num_counts = 1;
> priv->counter.signals = stm32_signals;
> diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c
> index 1ff07faef27f..b1fac22a0a4f 100644
> --- a/drivers/counter/ti-eqep.c
> +++ b/drivers/counter/ti-eqep.c
> @@ -74,16 +74,10 @@ enum {
>
> /* Position Counter Input Modes */
> enum {
> - TI_EQEP_COUNT_FUNC_QUAD_COUNT,
> - TI_EQEP_COUNT_FUNC_DIR_COUNT,
> - TI_EQEP_COUNT_FUNC_UP_COUNT,
> - TI_EQEP_COUNT_FUNC_DOWN_COUNT,
> -};
> -
> -enum {
> - TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES,
> - TI_EQEP_SYNAPSE_ACTION_RISING_EDGE,
> - TI_EQEP_SYNAPSE_ACTION_NONE,
> + TI_EQEP_COUNT_FUNC_QUAD_COUNT = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
> + TI_EQEP_COUNT_FUNC_DIR_COUNT = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
> + TI_EQEP_COUNT_FUNC_UP_COUNT = COUNTER_COUNT_FUNCTION_INCREASE,
> + TI_EQEP_COUNT_FUNC_DOWN_COUNT = COUNTER_COUNT_FUNCTION_DECREASE,
> };
>
> struct ti_eqep_cnt {
> @@ -118,7 +112,8 @@ static int ti_eqep_count_write(struct counter_device *counter,
> }
>
> static int ti_eqep_function_get(struct counter_device *counter,
> - struct counter_count *count, size_t *function)
> + struct counter_count *count,
> + enum counter_count_function *function)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 qdecctl;
> @@ -130,7 +125,8 @@ static int ti_eqep_function_get(struct counter_device *counter,
> }
>
> static int ti_eqep_function_set(struct counter_device *counter,
> - struct counter_count *count, size_t function)
> + struct counter_count *count,
> + enum counter_count_function function)
> {
> struct ti_eqep_cnt *priv = counter->priv;
>
> @@ -140,10 +136,11 @@ static int ti_eqep_function_set(struct counter_device *counter,
>
> static int ti_eqep_action_get(struct counter_device *counter,
> struct counter_count *count,
> - struct counter_synapse *synapse, size_t *action)
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> - size_t function;
> + enum counter_count_function function;
> u32 qdecctl;
> int err;
>
> @@ -156,7 +153,7 @@ static int ti_eqep_action_get(struct counter_device *counter,
> /* In quadrature mode, the rising and falling edge of both
> * QEPA and QEPB trigger QCLK.
> */
> - *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> break;
> case TI_EQEP_COUNT_FUNC_DIR_COUNT:
> /* In direction-count mode only rising edge of QEPA is counted
> @@ -164,10 +161,10 @@ static int ti_eqep_action_get(struct counter_device *counter,
> */
> switch (synapse->signal->id) {
> case TI_EQEP_SIGNAL_QEPA:
> - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> break;
> default:
> - *action = TI_EQEP_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> break;
> }
> break;
> @@ -183,134 +180,103 @@ static int ti_eqep_action_get(struct counter_device *counter,
> return err;
>
> if (qdecctl & QDECCTL_XCR)
> - *action = TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES;
> + *action = COUNTER_SYNAPSE_ACTION_BOTH_EDGES;
> else
> - *action = TI_EQEP_SYNAPSE_ACTION_RISING_EDGE;
> + *action = COUNTER_SYNAPSE_ACTION_RISING_EDGE;
> break;
> default:
> - *action = TI_EQEP_SYNAPSE_ACTION_NONE;
> + *action = COUNTER_SYNAPSE_ACTION_NONE;
> break;
> }
> break;
> + default: return -EINVAL;
> }
>
> return 0;
> }
>
> -static const struct counter_ops ti_eqep_counter_ops = {
> - .count_read = ti_eqep_count_read,
> - .count_write = ti_eqep_count_write,
> - .function_get = ti_eqep_function_get,
> - .function_set = ti_eqep_function_set,
> - .action_get = ti_eqep_action_get,
> -};
> -
> -static ssize_t ti_eqep_position_ceiling_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, char *buf)
> +static int ti_eqep_position_ceiling_read(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long *ceiling)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 qposmax;
>
> regmap_read(priv->regmap32, QPOSMAX, &qposmax);
>
> - return sprintf(buf, "%u\n", qposmax);
> + *ceiling = qposmax;
> +
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_ceiling_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, const char *buf,
> - size_t len)
> +static int ti_eqep_position_ceiling_write(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long ceiling)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> - int err;
> - u32 res;
>
> - err = kstrtouint(buf, 0, &res);
> - if (err < 0)
> - return err;
> + regmap_write(priv->regmap32, QPOSMAX, ceiling);
>
> - regmap_write(priv->regmap32, QPOSMAX, res);
> -
> - return len;
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_floor_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, char *buf)
> +static int ti_eqep_position_floor_read(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long *floor)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 qposinit;
>
> regmap_read(priv->regmap32, QPOSINIT, &qposinit);
>
> - return sprintf(buf, "%u\n", qposinit);
> + *floor = qposinit;
> +
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_floor_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, const char *buf,
> - size_t len)
> +static int ti_eqep_position_floor_write(struct counter_device *counter,
> + struct counter_count *count,
> + unsigned long floor)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> - int err;
> - u32 res;
>
> - err = kstrtouint(buf, 0, &res);
> - if (err < 0)
> - return err;
> + regmap_write(priv->regmap32, QPOSINIT, floor);
>
> - regmap_write(priv->regmap32, QPOSINIT, res);
> -
> - return len;
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_enable_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, char *buf)
> +static int ti_eqep_position_enable_read(struct counter_device *counter,
> + struct counter_count *count,
> + bool *enable)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> u32 qepctl;
>
> regmap_read(priv->regmap16, QEPCTL, &qepctl);
>
> - return sprintf(buf, "%u\n", !!(qepctl & QEPCTL_PHEN));
> + *enable = !!(qepctl & QEPCTL_PHEN);
> +
> + return 0;
> }
>
> -static ssize_t ti_eqep_position_enable_write(struct counter_device *counter,
> - struct counter_count *count,
> - void *ext_priv, const char *buf,
> - size_t len)
> +static int ti_eqep_position_enable_write(struct counter_device *counter,
> + struct counter_count *count,
> + bool enable)
> {
> struct ti_eqep_cnt *priv = counter->priv;
> - int err;
> - bool res;
>
> - err = kstrtobool(buf, &res);
> - if (err < 0)
> - return err;
> -
> - regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, res ? -1 : 0);
> + regmap_write_bits(priv->regmap16, QEPCTL, QEPCTL_PHEN, enable ? -1 : 0);
>
> - return len;
> + return 0;
> }
>
> -static struct counter_count_ext ti_eqep_position_ext[] = {
> - {
> - .name = "ceiling",
> - .read = ti_eqep_position_ceiling_read,
> - .write = ti_eqep_position_ceiling_write,
> - },
> - {
> - .name = "floor",
> - .read = ti_eqep_position_floor_read,
> - .write = ti_eqep_position_floor_write,
> - },
> - {
> - .name = "enable",
> - .read = ti_eqep_position_enable_read,
> - .write = ti_eqep_position_enable_write,
> - },
> +static struct counter_data ti_eqep_position_ext[] = {
> + COUNTER_DATA_CEILING(ti_eqep_position_ceiling_read,
> + ti_eqep_position_ceiling_write),
> + COUNTER_DATA_FLOOR(ti_eqep_position_floor_read,
> + ti_eqep_position_floor_write),
> + COUNTER_DATA_ENABLE(ti_eqep_position_enable_read,
> + ti_eqep_position_enable_write),
> };
>
> static struct counter_signal ti_eqep_signals[] = {
> @@ -325,16 +291,16 @@ static struct counter_signal ti_eqep_signals[] = {
> };
>
> static const enum counter_count_function ti_eqep_position_functions[] = {
> - [TI_EQEP_COUNT_FUNC_QUAD_COUNT] = COUNTER_COUNT_FUNCTION_QUADRATURE_X4,
> - [TI_EQEP_COUNT_FUNC_DIR_COUNT] = COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
> - [TI_EQEP_COUNT_FUNC_UP_COUNT] = COUNTER_COUNT_FUNCTION_INCREASE,
> - [TI_EQEP_COUNT_FUNC_DOWN_COUNT] = COUNTER_COUNT_FUNCTION_DECREASE,
> + TI_EQEP_COUNT_FUNC_QUAD_COUNT,
> + TI_EQEP_COUNT_FUNC_DIR_COUNT,
> + TI_EQEP_COUNT_FUNC_UP_COUNT,
> + TI_EQEP_COUNT_FUNC_DOWN_COUNT,
> };
>
> static const enum counter_synapse_action ti_eqep_position_synapse_actions[] = {
> - [TI_EQEP_SYNAPSE_ACTION_BOTH_EDGES] = COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> - [TI_EQEP_SYNAPSE_ACTION_RISING_EDGE] = COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> - [TI_EQEP_SYNAPSE_ACTION_NONE] = COUNTER_SYNAPSE_ACTION_NONE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_NONE,
> };
>
> static struct counter_synapse ti_eqep_position_synapses[] = {
> @@ -406,7 +372,11 @@ static int ti_eqep_probe(struct platform_device *pdev)
>
> priv->counter.name = dev_name(dev);
> priv->counter.parent = dev;
> - priv->counter.ops = &ti_eqep_counter_ops;
> + priv->counter.count_read = ti_eqep_count_read;
> + priv->counter.count_write = ti_eqep_count_write;
> + priv->counter.function_read = ti_eqep_function_get;
> + priv->counter.function_write = ti_eqep_function_set;
> + priv->counter.action_read = ti_eqep_action_get;
> priv->counter.counts = ti_eqep_counts;
> priv->counter.num_counts = ARRAY_SIZE(ti_eqep_counts);
> priv->counter.signals = ti_eqep_signals;
> diff --git a/include/linux/counter.h b/include/linux/counter.h
> index 9dbd5df4cd34..d628c7eaf754 100644
> --- a/include/linux/counter.h
> +++ b/include/linux/counter.h
> @@ -6,449 +6,286 @@
> #ifndef _COUNTER_H_
> #define _COUNTER_H_
>
> -#include <linux/counter_enum.h>
> #include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> #include <linux/types.h>
> +#include <uapi/linux/counter-types.h>
>
> -enum counter_count_direction {
> - COUNTER_COUNT_DIRECTION_FORWARD = 0,
> - COUNTER_COUNT_DIRECTION_BACKWARD
> -};
> -extern const char *const counter_count_direction_str[2];
> -
> -enum counter_count_mode {
> - COUNTER_COUNT_MODE_NORMAL = 0,
> - COUNTER_COUNT_MODE_RANGE_LIMIT,
> - COUNTER_COUNT_MODE_NON_RECYCLE,
> - COUNTER_COUNT_MODE_MODULO_N
> -};
> -extern const char *const counter_count_mode_str[4];
> -
> -struct counter_device;
> -struct counter_signal;
> -
> -/**
> - * struct counter_signal_ext - Counter Signal extensions
> - * @name: attribute name
> - * @read: read callback for this attribute; may be NULL
> - * @write: write callback for this attribute; may be NULL
> - * @priv: data private to the driver
> - */
> -struct counter_signal_ext {
> +struct counter_data {
> + enum counter_data_type type;
> const char *name;
> - ssize_t (*read)(struct counter_device *counter,
> - struct counter_signal *signal, void *priv, char *buf);
> - ssize_t (*write)(struct counter_device *counter,
> - struct counter_signal *signal, void *priv,
> - const char *buf, size_t len);
> + void *read;
> + void *write;
> void *priv;
> };
>
> /**
> * struct counter_signal - Counter Signal node
> - * @id: unique ID used to identify signal
> - * @name: device-specific Signal name; ideally, this should match the name
> - * as it appears in the datasheet documentation
> - * @ext: optional array of Counter Signal extensions
> - * @num_ext: number of Counter Signal extensions specified in @ext
> - * @priv: optional private data supplied by driver
> + * @id: unique ID used to identify the Signal
> + * @name: device-specific Signal name
> + * @ext: optional array of Signal extensions
> + * @num_ext: number of Signal extensions specified in @ext
> */
> struct counter_signal {
> int id;
> const char *name;
>
> - const struct counter_signal_ext *ext;
> + struct counter_data *ext;
> size_t num_ext;
> -
> - void *priv;
> -};
> -
> -/**
> - * struct counter_signal_enum_ext - Signal enum extension attribute
> - * @items: Array of strings
> - * @num_items: Number of items specified in @items
> - * @set: Set callback function; may be NULL
> - * @get: Get callback function; may be NULL
> - *
> - * The counter_signal_enum_ext structure can be used to implement enum style
> - * Signal extension attributes. Enum style attributes are those which have a set
> - * of strings that map to unsigned integer values. The Generic Counter Signal
> - * enum extension helper code takes care of mapping between value and string, as
> - * well as generating a "_available" file which contains a list of all available
> - * items. The get callback is used to query the currently active item; the index
> - * of the item within the respective items array is returned via the 'item'
> - * parameter. The set callback is called when the attribute is updated; the
> - * 'item' parameter contains the index of the newly activated item within the
> - * respective items array.
> - */
> -struct counter_signal_enum_ext {
> - const char * const *items;
> - size_t num_items;
> - int (*get)(struct counter_device *counter,
> - struct counter_signal *signal, size_t *item);
> - int (*set)(struct counter_device *counter,
> - struct counter_signal *signal, size_t item);
> -};
> -
> -/**
> - * COUNTER_SIGNAL_ENUM() - Initialize Signal enum extension
> - * @_name: Attribute name
> - * @_e: Pointer to a counter_signal_enum_ext structure
> - *
> - * This should usually be used together with COUNTER_SIGNAL_ENUM_AVAILABLE()
> - */
> -#define COUNTER_SIGNAL_ENUM(_name, _e) \
> -{ \
> - .name = (_name), \
> - .read = counter_signal_enum_read, \
> - .write = counter_signal_enum_write, \
> - .priv = (_e) \
> -}
> -
> -/**
> - * COUNTER_SIGNAL_ENUM_AVAILABLE() - Initialize Signal enum available extension
> - * @_name: Attribute name ("_available" will be appended to the name)
> - * @_e: Pointer to a counter_signal_enum_ext structure
> - *
> - * Creates a read only attribute that lists all the available enum items in a
> - * newline separated list. This should usually be used together with
> - * COUNTER_SIGNAL_ENUM()
> - */
> -#define COUNTER_SIGNAL_ENUM_AVAILABLE(_name, _e) \
> -{ \
> - .name = (_name "_available"), \
> - .read = counter_signal_enum_available_read, \
> - .priv = (_e) \
> -}
> -
> -enum counter_synapse_action {
> - COUNTER_SYNAPSE_ACTION_NONE = 0,
> - COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> - COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> - COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> };
>
> /**
> * struct counter_synapse - Counter Synapse node
> - * @action: index of current action mode
> * @actions_list: array of available action modes
> * @num_actions: number of action modes specified in @actions_list
> - * @signal: pointer to associated signal
> + * @signal: pointer to the associated Signal
> */
> struct counter_synapse {
> - size_t action;
> const enum counter_synapse_action *actions_list;
> size_t num_actions;
>
> struct counter_signal *signal;
> };
>
> -struct counter_count;
> -
> -/**
> - * struct counter_count_ext - Counter Count extension
> - * @name: attribute name
> - * @read: read callback for this attribute; may be NULL
> - * @write: write callback for this attribute; may be NULL
> - * @priv: data private to the driver
> - */
> -struct counter_count_ext {
> - const char *name;
> - ssize_t (*read)(struct counter_device *counter,
> - struct counter_count *count, void *priv, char *buf);
> - ssize_t (*write)(struct counter_device *counter,
> - struct counter_count *count, void *priv,
> - const char *buf, size_t len);
> - void *priv;
> -};
> -
> -enum counter_count_function {
> - COUNTER_COUNT_FUNCTION_INCREASE = 0,
> - COUNTER_COUNT_FUNCTION_DECREASE,
> - COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
> - COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A,
> - COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B,
> - COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
> - COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B,
> - COUNTER_COUNT_FUNCTION_QUADRATURE_X4
> -};
> -
> /**
> * struct counter_count - Counter Count node
> - * @id: unique ID used to identify Count
> - * @name: device-specific Count name; ideally, this should match
> - * the name as it appears in the datasheet documentation
> - * @function: index of current function mode
> - * @functions_list: array available function modes
> + * @id: unique ID used to identify the Count
> + * @name: device-specific Count name
> + * @functions_list: array of available function modes
> * @num_functions: number of function modes specified in @functions_list
> - * @synapses: array of synapses for initialization
> - * @num_synapses: number of synapses specified in @synapses
> - * @ext: optional array of Counter Count extensions
> - * @num_ext: number of Counter Count extensions specified in @ext
> - * @priv: optional private data supplied by driver
> + * @synapses: array of Synapses for initialization
> + * @num_synapses: number of Synapses specified in @synapses
> + * @ext: optional array of Count extensions
> + * @num_ext: number of Count extensions specified in @ext
> */
> struct counter_count {
> int id;
> const char *name;
>
> - size_t function;
> const enum counter_count_function *functions_list;
> size_t num_functions;
>
> struct counter_synapse *synapses;
> size_t num_synapses;
>
> - const struct counter_count_ext *ext;
> + struct counter_data *ext;
> size_t num_ext;
> -
> - void *priv;
> -};
> -
> -/**
> - * struct counter_count_enum_ext - Count enum extension attribute
> - * @items: Array of strings
> - * @num_items: Number of items specified in @items
> - * @set: Set callback function; may be NULL
> - * @get: Get callback function; may be NULL
> - *
> - * The counter_count_enum_ext structure can be used to implement enum style
> - * Count extension attributes. Enum style attributes are those which have a set
> - * of strings that map to unsigned integer values. The Generic Counter Count
> - * enum extension helper code takes care of mapping between value and string, as
> - * well as generating a "_available" file which contains a list of all available
> - * items. The get callback is used to query the currently active item; the index
> - * of the item within the respective items array is returned via the 'item'
> - * parameter. The set callback is called when the attribute is updated; the
> - * 'item' parameter contains the index of the newly activated item within the
> - * respective items array.
> - */
> -struct counter_count_enum_ext {
> - const char * const *items;
> - size_t num_items;
> - int (*get)(struct counter_device *counter, struct counter_count *count,
> - size_t *item);
> - int (*set)(struct counter_device *counter, struct counter_count *count,
> - size_t item);
> };
>
> /**
> - * COUNTER_COUNT_ENUM() - Initialize Count enum extension
> - * @_name: Attribute name
> - * @_e: Pointer to a counter_count_enum_ext structure
> - *
> - * This should usually be used together with COUNTER_COUNT_ENUM_AVAILABLE()
> - */
> -#define COUNTER_COUNT_ENUM(_name, _e) \
> -{ \
> - .name = (_name), \
> - .read = counter_count_enum_read, \
> - .write = counter_count_enum_write, \
> - .priv = (_e) \
> -}
> -
> -/**
> - * COUNTER_COUNT_ENUM_AVAILABLE() - Initialize Count enum available extension
> - * @_name: Attribute name ("_available" will be appended to the name)
> - * @_e: Pointer to a counter_count_enum_ext structure
> - *
> - * Creates a read only attribute that lists all the available enum items in a
> - * newline separated list. This should usually be used together with
> - * COUNTER_COUNT_ENUM()
> - */
> -#define COUNTER_COUNT_ENUM_AVAILABLE(_name, _e) \
> -{ \
> - .name = (_name "_available"), \
> - .read = counter_count_enum_available_read, \
> - .priv = (_e) \
> -}
> -
> -/**
> - * struct counter_device_attr_group - internal container for attribute group
> + * struct counter_attribute_group - internal container for attribute group
> * @attr_group: Counter sysfs attributes group
> * @attr_list: list to keep track of created Counter sysfs attributes
> * @num_attr: number of Counter sysfs attributes
> */
> -struct counter_device_attr_group {
> +struct counter_attribute_group {
> struct attribute_group attr_group;
> struct list_head attr_list;
> size_t num_attr;
> };
>
> /**
> - * struct counter_device_state - internal state container for a Counter device
> + * struct counter_device - Counter data structure
> + * @name: name of the device
> + * @parent: optional parent device providing the counters
> + * @signal_read: optional read callback for Signals. The read value of
> + * the respective Signal should be passed back via the
> + * value parameter.
> + * @count_read: optional read callback for Counts. The read value of the
> + * respective Count should be passed back via the value
> + * parameter.
> + * @count_write: optional write callback for Counts. The write value for
> + * the respective Count is passed in via the value
> + * parameter.
> + * @function_read: optional read callback the Count function modes. The
> + * read function mode of the respective Count should be
> + * passed back via the function parameter.
> + * @function_write: option write callback for Count function modes. The
> + * function mode to write for the respective Count is
> + * passed in via the function parameter.
> + * @action_read: optional read callback the Synapse action modes. The
> + * read action mode of the respective Synapse should be
> + * passed back via the action parameter.
> + * @action_write: option write callback for Synapse action modes. The
> + * action mode to write for the respective Synapse is
> + * passed in via the action parameter.
> + * @signals: array of Signals
> + * @num_signals: number of Signals specified in @signals
> + * @counts: array of Counts
> + * @num_counts: number of Counts specified in @counts
> + * @ext: optional array of Counter device extensions
> + * @num_ext: number of Counter device extensions specified in @ext
> + * @priv: optional private data supplied by driver
> * @id: unique ID used to identify the Counter
> * @dev: internal device structure
> + * @synapse_names_list: Synapse names list
> * @groups_list: attribute groups list (for Signals, Counts, and ext)
> * @num_groups: number of attribute groups containers
> * @groups: Counter sysfs attribute groups (to populate @dev.groups)
> */
> -struct counter_device_state {
> +struct counter_device {
> + const char *name;
> + struct device *parent;
> +
> + int (*signal_read)(struct counter_device *counter,
> + struct counter_signal *signal,
> + enum counter_signal_value *value);
> + int (*count_read)(struct counter_device *counter,
> + struct counter_count *count, unsigned long *value);
> + int (*count_write)(struct counter_device *counter,
> + struct counter_count *count, unsigned long value);
> + int (*function_read)(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_function *function);
> + int (*function_write)(struct counter_device *counter,
> + struct counter_count *count,
> + enum counter_count_function function);
> + int (*action_read)(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action *action);
> + int (*action_write)(struct counter_device *counter,
> + struct counter_count *count,
> + struct counter_synapse *synapse,
> + enum counter_synapse_action action);
> +
> + struct counter_signal *signals;
> + size_t num_signals;
> + struct counter_count *counts;
> + size_t num_counts;
> +
> + struct counter_data *ext;
> + size_t num_ext;
> +
> + void *priv;
> +
> int id;
> struct device dev;
> - struct counter_device_attr_group *groups_list;
> + struct list_head synapse_names_list;
> + struct counter_attribute_group *groups_list;
> size_t num_groups;
> const struct attribute_group **groups;
> };
>
> -enum counter_signal_value {
> - COUNTER_SIGNAL_LOW = 0,
> - COUNTER_SIGNAL_HIGH
> -};
> +int counter_register(struct counter_device *const counter);
> +void counter_unregister(struct counter_device *const counter);
> +int devm_counter_register(struct device *dev,
> + struct counter_device *const counter);
> +void devm_counter_unregister(struct device *dev,
> + struct counter_device *const counter);
>
> -/**
> - * struct counter_ops - Callbacks from driver
> - * @signal_read: optional read callback for Signal attribute. The read
> - * value of the respective Signal should be passed back via
> - * the val parameter.
> - * @count_read: optional read callback for Count attribute. The read
> - * value of the respective Count should be passed back via
> - * the val parameter.
> - * @count_write: optional write callback for Count attribute. The write
> - * value for the respective Count is passed in via the val
> - * parameter.
> - * @function_get: function to get the current count function mode. Returns
> - * 0 on success and negative error code on error. The index
> - * of the respective Count's returned function mode should
> - * be passed back via the function parameter.
> - * @function_set: function to set the count function mode. function is the
> - * index of the requested function mode from the respective
> - * Count's functions_list array.
> - * @action_get: function to get the current action mode. Returns 0 on
> - * success and negative error code on error. The index of
> - * the respective Synapse's returned action mode should be
> - * passed back via the action parameter.
> - * @action_set: function to set the action mode. action is the index of
> - * the requested action mode from the respective Synapse's
> - * actions_list array.
> - */
> -struct counter_ops {
> - int (*signal_read)(struct counter_device *counter,
> - struct counter_signal *signal,
> - enum counter_signal_value *val);
> - int (*count_read)(struct counter_device *counter,
> - struct counter_count *count, unsigned long *val);
> - int (*count_write)(struct counter_device *counter,
> - struct counter_count *count, unsigned long val);
> - int (*function_get)(struct counter_device *counter,
> - struct counter_count *count, size_t *function);
> - int (*function_set)(struct counter_device *counter,
> - struct counter_count *count, size_t function);
> - int (*action_get)(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse, size_t *action);
> - int (*action_set)(struct counter_device *counter,
> - struct counter_count *count,
> - struct counter_synapse *synapse, size_t action);
> -};
> +#define COUNTER_DATA_BOOL(_name, _read, _write) \
> +{ \
> + .type = COUNTER_DATA_TYPE_BOOL, \
> + .name = (_name), \
> + .read = (_read), \
> + .write = (_write), \
> +}
>
> -/**
> - * struct counter_device_ext - Counter device extension
> - * @name: attribute name
> - * @read: read callback for this attribute; may be NULL
> - * @write: write callback for this attribute; may be NULL
> - * @priv: data private to the driver
> - */
> -struct counter_device_ext {
> - const char *name;
> - ssize_t (*read)(struct counter_device *counter, void *priv, char *buf);
> - ssize_t (*write)(struct counter_device *counter, void *priv,
> - const char *buf, size_t len);
> - void *priv;
> +#define COUNTER_DATA_UNSIGNED_LONG(_name, _read, _write) \
> +{ \
> + .type = COUNTER_DATA_TYPE_UNSIGNED_LONG, \
> + .name = (_name), \
> + .read = (_read), \
> + .write = (_write), \
> +}
> +
> +#define COUNTER_DATA_STRING(_name, _read, _write) \
> +{ \
> + .type = COUNTER_DATA_TYPE_STRING, \
> + .name = (_name), \
> + .read = (_read), \
> + .write = (_write), \
> +}
> +
> +struct counter_available {
> + void *items;
> + size_t num_items;
> };
>
> -/**
> - * struct counter_device_enum_ext - Counter enum extension attribute
> - * @items: Array of strings
> - * @num_items: Number of items specified in @items
> - * @set: Set callback function; may be NULL
> - * @get: Get callback function; may be NULL
> - *
> - * The counter_device_enum_ext structure can be used to implement enum style
> - * Counter extension attributes. Enum style attributes are those which have a
> - * set of strings that map to unsigned integer values. The Generic Counter enum
> - * extension helper code takes care of mapping between value and string, as well
> - * as generating a "_available" file which contains a list of all available
> - * items. The get callback is used to query the currently active item; the index
> - * of the item within the respective items array is returned via the 'item'
> - * parameter. The set callback is called when the attribute is updated; the
> - * 'item' parameter contains the index of the newly activated item within the
> - * respective items array.
> - */
> -struct counter_device_enum_ext {
> +#define DEFINE_COUNTER_AVAILABLE(_name, _items) \
> + struct counter_available _name = { \
> + .items = (_items), \
> + .num_items = ARRAY_SIZE(_items), \
> + }
> +
> +struct counter_enum {
> const char * const *items;
> size_t num_items;
> - int (*get)(struct counter_device *counter, size_t *item);
> - int (*set)(struct counter_device *counter, size_t item);
> };
>
> -/**
> - * COUNTER_DEVICE_ENUM() - Initialize Counter enum extension
> - * @_name: Attribute name
> - * @_e: Pointer to a counter_device_enum_ext structure
> - *
> - * This should usually be used together with COUNTER_DEVICE_ENUM_AVAILABLE()
> - */
> -#define COUNTER_DEVICE_ENUM(_name, _e) \
> +#define DEFINE_COUNTER_ENUM(_name, _items) \
> + struct counter_enum _name = { \
> + .items = (_items), \
> + .num_items = ARRAY_SIZE(_items), \
> + }
> +
> +#define COUNTER_DATA_ENUM(_name, _get, _set, _enum) \
> { \
> + .type = COUNTER_DATA_TYPE_ENUM, \
> .name = (_name), \
> - .read = counter_device_enum_read, \
> - .write = counter_device_enum_write, \
> - .priv = (_e) \
> + .read = (_get), \
> + .write = (_set), \
> + .priv = &(_enum), \
> }
>
> -/**
> - * COUNTER_DEVICE_ENUM_AVAILABLE() - Initialize Counter enum available extension
> - * @_name: Attribute name ("_available" will be appended to the name)
> - * @_e: Pointer to a counter_device_enum_ext structure
> - *
> - * Creates a read only attribute that lists all the available enum items in a
> - * newline separated list. This should usually be used together with
> - * COUNTER_DEVICE_ENUM()
> - */
> -#define COUNTER_DEVICE_ENUM_AVAILABLE(_name, _e) \
> +#define COUNTER_DATA_ENUM_AVAILABLE(_name, _read, _enum) \
> { \
> + .type = COUNTER_DATA_TYPE_ENUM_AVAILABLE, \
> .name = (_name "_available"), \
> - .read = counter_device_enum_available_read, \
> - .priv = (_e) \
> + .read = (_read), \
> + .priv = &(_enum), \
> }
>
> -/**
> - * struct counter_device - Counter data structure
> - * @name: name of the device as it appears in the datasheet
> - * @parent: optional parent device providing the counters
> - * @device_state: internal device state container
> - * @ops: callbacks from driver
> - * @signals: array of Signals
> - * @num_signals: number of Signals specified in @signals
> - * @counts: array of Counts
> - * @num_counts: number of Counts specified in @counts
> - * @ext: optional array of Counter device extensions
> - * @num_ext: number of Counter device extensions specified in @ext
> - * @priv: optional private data supplied by driver
> - */
> -struct counter_device {
> - const char *name;
> - struct device *parent;
> - struct counter_device_state *device_state;
> +#define COUNTER_DATA_ENUM_AND_AVAILABLE(_name, _get, _set, _enum) \
> + COUNTER_DATA_ENUM(_name, _get, _set, _enum), \
> + COUNTER_DATA_ENUM_AVAILABLE(_name, _get, _enum)
>
> - const struct counter_ops *ops;
> +#define COUNTER_DATA_CEILING(_read, _write) \
> + COUNTER_DATA_UNSIGNED_LONG("ceiling", _read, _write)
>
> - struct counter_signal *signals;
> - size_t num_signals;
> - struct counter_count *counts;
> - size_t num_counts;
> +#define COUNTER_DATA_COUNT_MODE(_read, _write) \
> +{ \
> + .type = COUNTER_DATA_TYPE_COUNT_MODE, \
> + .name = "count_mode", \
> + .read = (_read), \
> + .write = (_write), \
> +}
>
> - const struct counter_device_ext *ext;
> - size_t num_ext;
> +#define COUNTER_DATA_COUNT_MODE_AVAILABLE(_read, _available) \
> +{ \
> + .type = COUNTER_DATA_TYPE_COUNT_MODE_AVAILABLE, \
> + .name = "count_mode_available", \
> + .read = (_read), \
> + .priv = &(_available), \
> +}
>
> - void *priv;
> -};
> +#define COUNTER_DATA_COUNT_MODE_AND_AVAILABLE(_read, _write, _available) \
> + COUNTER_DATA_COUNT_MODE(_read, _write), \
> + COUNTER_DATA_COUNT_MODE_AVAILABLE(_read, _available)
>
> -int counter_register(struct counter_device *const counter);
> -void counter_unregister(struct counter_device *const counter);
> -int devm_counter_register(struct device *dev,
> - struct counter_device *const counter);
> -void devm_counter_unregister(struct device *dev,
> - struct counter_device *const counter);
> +#define COUNTER_DATA_DIRECTION(_read) \
> +{ \
> + .type = COUNTER_DATA_TYPE_COUNT_DIRECTION, \
> + .name = "direction", \
> + .read = (_read), \
> +}
> +
> +#define COUNTER_DATA_ENABLE(_read, _write) \
> + COUNTER_DATA_BOOL("enable", _read, _write)
> +
> +#define COUNTER_DATA_ERROR_NOISE_AND_AVAILABLE(_read, _available) \
> + COUNTER_DATA_STRING("error_noise", _read, NULL), \
> + COUNTER_DATA_STRING("error_noise_available", _available, NULL)
> +
> +#define COUNTER_DATA_FLOOR(_read, _write) \
> + COUNTER_DATA_UNSIGNED_LONG("floor", _read, _write)
> +
> +#define COUNTER_DATA_PRESET(_read, _write) \
> + COUNTER_DATA_UNSIGNED_LONG("preset", _read, _write)
> +
> +#define COUNTER_DATA_PRESET_ENABLE(_read, _write) \
> + COUNTER_DATA_BOOL("preset_enable", _read, _write)
>
> #endif /* _COUNTER_H_ */
> diff --git a/include/linux/counter_enum.h b/include/linux/counter_enum.h
> deleted file mode 100644
> index 9f917298a88f..000000000000
> --- a/include/linux/counter_enum.h
> +++ /dev/null
> @@ -1,45 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0 */
> -/*
> - * Counter interface enum functions
> - * Copyright (C) 2018 William Breathitt Gray
> - */
> -#ifndef _COUNTER_ENUM_H_
> -#define _COUNTER_ENUM_H_
> -
> -#include <linux/types.h>
> -
> -struct counter_device;
> -struct counter_signal;
> -struct counter_count;
> -
> -ssize_t counter_signal_enum_read(struct counter_device *counter,
> - struct counter_signal *signal, void *priv,
> - char *buf);
> -ssize_t counter_signal_enum_write(struct counter_device *counter,
> - struct counter_signal *signal, void *priv,
> - const char *buf, size_t len);
> -
> -ssize_t counter_signal_enum_available_read(struct counter_device *counter,
> - struct counter_signal *signal,
> - void *priv, char *buf);
> -
> -ssize_t counter_count_enum_read(struct counter_device *counter,
> - struct counter_count *count, void *priv,
> - char *buf);
> -ssize_t counter_count_enum_write(struct counter_device *counter,
> - struct counter_count *count, void *priv,
> - const char *buf, size_t len);
> -
> -ssize_t counter_count_enum_available_read(struct counter_device *counter,
> - struct counter_count *count,
> - void *priv, char *buf);
> -
> -ssize_t counter_device_enum_read(struct counter_device *counter, void *priv,
> - char *buf);
> -ssize_t counter_device_enum_write(struct counter_device *counter, void *priv,
> - const char *buf, size_t len);
> -
> -ssize_t counter_device_enum_available_read(struct counter_device *counter,
> - void *priv, char *buf);
> -
> -#endif /* _COUNTER_ENUM_H_ */
> diff --git a/include/uapi/linux/counter-types.h b/include/uapi/linux/counter-types.h
> new file mode 100644
> index 000000000000..757256775949
> --- /dev/null
> +++ b/include/uapi/linux/counter-types.h
> @@ -0,0 +1,67 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * Counter interface data types
> + * Copyright (C) 2020 William Breathitt Gray
> + */
> +#ifndef _UAPI_COUNTER_TYPES_H_
> +#define _UAPI_COUNTER_TYPES_H_
> +
> +enum counter_count_direction {
> + COUNTER_COUNT_DIRECTION_FORWARD = 0,
> + COUNTER_COUNT_DIRECTION_BACKWARD
> +};
> +
> +enum counter_count_mode {
> + COUNTER_COUNT_MODE_NORMAL = 0,
> + COUNTER_COUNT_MODE_RANGE_LIMIT,
> + COUNTER_COUNT_MODE_NON_RECYCLE,
> + COUNTER_COUNT_MODE_MODULO_N
> +};
> +
> +enum counter_count_function {
> + COUNTER_COUNT_FUNCTION_INCREASE = 0,
> + COUNTER_COUNT_FUNCTION_DECREASE,
> + COUNTER_COUNT_FUNCTION_PULSE_DIRECTION,
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A,
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B,
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A,
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B,
> + COUNTER_COUNT_FUNCTION_QUADRATURE_X4
> +};
> +
> +enum counter_signal_value {
> + COUNTER_SIGNAL_LOW = 0,
> + COUNTER_SIGNAL_HIGH
> +};
> +
> +enum counter_synapse_action {
> + COUNTER_SYNAPSE_ACTION_NONE = 0,
> + COUNTER_SYNAPSE_ACTION_RISING_EDGE,
> + COUNTER_SYNAPSE_ACTION_FALLING_EDGE,
> + COUNTER_SYNAPSE_ACTION_BOTH_EDGES
> +};
> +
> +enum counter_data_type {
> + COUNTER_DATA_TYPE_BOOL = 0,
> + COUNTER_DATA_TYPE_UNSIGNED_LONG,
> + COUNTER_DATA_TYPE_SIZE,
> + COUNTER_DATA_TYPE_STRING,
> + COUNTER_DATA_TYPE_COUNT_FUNCTION,
> + COUNTER_DATA_TYPE_COUNT_FUNCTION_AVAILABLE,
> + COUNTER_DATA_TYPE_SIGNAL,
> + COUNTER_DATA_TYPE_SYNAPSE_ACTION,
> + COUNTER_DATA_TYPE_SYNAPSE_ACTION_AVAILABLE,
> + COUNTER_DATA_TYPE_ENUM,
> + COUNTER_DATA_TYPE_ENUM_AVAILABLE,
> + COUNTER_DATA_TYPE_COUNT_DIRECTION,
> + COUNTER_DATA_TYPE_COUNT_MODE,
> + COUNTER_DATA_TYPE_COUNT_MODE_AVAILABLE,
> +};
> +
> +enum counter_owner_type {
> + COUNTER_OWNER_TYPE_DEVICE,
> + COUNTER_OWNER_TYPE_SIGNAL,
> + COUNTER_OWNER_TYPE_COUNT,
> +};
> +
> +#endif /* _UAPI_COUNTER_TYPES_H_ */

Next message: Adam Ford: "Re: [RFC PATCH 4/4] arm64: dts: imx8mm: Add GPU nodes for 2D and 3D core using Etnaviv"
Previous message: Jens Axboe: "Re: [PATCH v4] eventfd: convert to f_op->read_iter()"
In reply to: kbuild test robot: "Re: [PATCH 1/4] counter: Internalize sysfs interface code"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]