Re: [PATCH 11/13] iio: cros_ec: Expose hwfifo_timeout

From: Jonathan Cameron
Date: Sat Oct 05 2019 - 12:36:02 EST

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On Sun, 22 Sep 2019 10:50:19 -0700
Gwendal Grignou <gwendal@xxxxxxxxxxxx> wrote:

> Expose EC sampling rate through buffer/hwfifo_timeout.

This seems a bit odd unless EC term "sampling rate"
is rather different from what I'd expect. Code looks
fine though ;)

> Rename frequency to sampling_frequency to match IIO ABI.

That looks like a straight forward bug. We might
want to think about pushing that back to older kernels.

>
> Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

> ---
> .../common/cros_ec_sensors/cros_ec_sensors.c | 1 -
> .../cros_ec_sensors/cros_ec_sensors_core.c | 110 +++++++++++++-----
> drivers/iio/light/cros_ec_light_prox.c | 3 +-
> drivers/iio/pressure/cros_ec_baro.c | 3 +-
> 4 files changed, 81 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> index b78a942ac8e5..95a4b4cf8f87 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> @@ -255,7 +255,6 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
> BIT(IIO_CHAN_INFO_CALIBSCALE);
> channel->info_mask_shared_by_all =
> BIT(IIO_CHAN_INFO_SCALE) |
> - BIT(IIO_CHAN_INFO_FREQUENCY) |
> BIT(IIO_CHAN_INFO_SAMP_FREQ);
> channel->info_mask_shared_by_all_available =
> BIT(IIO_CHAN_INFO_SAMP_FREQ);
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index c4c37c6df301..a31a761e3a81 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -11,6 +11,7 @@
> #include <linux/iio/common/cros_ec_sensors_core.h>
> #include <linux/iio/iio.h>
> #include <linux/iio/kfifo_buf.h>
> +#include <linux/iio/sysfs.h>
> #include <linux/iio/trigger_consumer.h>
> #include <linux/iio/triggered_buffer.h>
> #include <linux/kernel.h>
> @@ -84,6 +85,75 @@ static void get_default_min_max_freq(enum motionsensor_type type,
> }
> }
>
> +static int cros_ec_sensor_set_ec_rate(struct cros_ec_sensors_core_state *st,
> + int rate)
> +{
> + int ret;
> +
> + mutex_lock(&st->cmd_lock);
> + st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
> + st->param.ec_rate.data = rate;
> + ret = cros_ec_motion_send_host_cmd(st, 0);
> + if (ret == 0)
> + st->curr_sampl_freq = rate;
> + mutex_unlock(&st->cmd_lock);
> + return ret;
> +}
> +
> +static ssize_t cros_ec_sensor_set_report_latency(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> + int integer, fract, ret;
> + int latency;
> +
> + ret = iio_str_to_fixpoint(buf, 100000, &integer, &fract);
> + if (ret)
> + return ret;
> +
> + /* EC rate is in ms. */
> + latency = integer * 1000 + fract / 1000;
> + ret = cros_ec_sensor_set_ec_rate(st, latency);
> + if (ret < 0)
> + return ret;
> +
> + return len;
> +}
> +
> +static ssize_t cros_ec_sensor_get_report_latency(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> + int latency, ret;
> +
> + mutex_lock(&st->cmd_lock);
> + st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
> + st->param.ec_rate.data = EC_MOTION_SENSE_NO_VALUE;
> +
> + ret = cros_ec_motion_send_host_cmd(st, 0);
> + latency = st->resp->ec_rate.ret;
> + mutex_unlock(&st->cmd_lock);
> + if (ret < 0)
> + return ret;
> +
> + return sprintf(buf, "%d.%06u\n",
> + latency / 1000,
> + (latency % 1000) * 1000);
> +}
> +
> +static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
> + cros_ec_sensor_get_report_latency,
> + cros_ec_sensor_set_report_latency, 0);
> +
> +static const struct attribute *cros_ec_sensor_fifo_attributes[] = {
> + &iio_dev_attr_hwfifo_timeout.dev_attr.attr,
> + NULL,
> +};
> +
> int cros_ec_sensors_push_data(
> struct iio_dev *indio_dev,
> s16 *data,
> @@ -194,6 +264,9 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> if (!buffer)
> return -ENOMEM;
>
> + iio_buffer_set_attrs(buffer,
> + cros_ec_sensor_fifo_attributes);
> +
> iio_device_attach_buffer(indio_dev, buffer);
> indio_dev->modes = INDIO_BUFFER_SOFTWARE;
> ret = cros_ec_sensorhub_register_push_data(
> @@ -553,18 +626,6 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
>
> switch (mask) {
> case IIO_CHAN_INFO_SAMP_FREQ:
> - st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
> - st->param.ec_rate.data =
> - EC_MOTION_SENSE_NO_VALUE;
> -
> - ret = cros_ec_motion_send_host_cmd(st, 0);
> - if (ret)
> - break;
> -
> - *val = st->resp->ec_rate.ret;
> - ret = IIO_VAL_INT;
> - break;
> - case IIO_CHAN_INFO_FREQUENCY:
> st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR;
> st->param.sensor_odr.data =
> EC_MOTION_SENSE_NO_VALUE;
> @@ -613,23 +674,16 @@ int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
> int ret;
>
> switch (mask) {
> - case IIO_CHAN_INFO_FREQUENCY:
> + case IIO_CHAN_INFO_SAMP_FREQ:
> st->param.cmd = MOTIONSENSE_CMD_SENSOR_ODR;
> st->param.sensor_odr.data = val;
>
> /* Always roundup, so caller gets at least what it asks for. */
> st->param.sensor_odr.roundup = 1;
>
> - ret = cros_ec_motion_send_host_cmd(st, 0);
> - break;
> - case IIO_CHAN_INFO_SAMP_FREQ:
> - st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
> - st->param.ec_rate.data = val;
> -
> ret = cros_ec_motion_send_host_cmd(st, 0);
> if (ret)
> break;
> - st->curr_sampl_freq = val;
> break;
> default:
> ret = -EINVAL;
> @@ -643,6 +697,7 @@ static int __maybe_unused cros_ec_sensors_prepare(struct device *dev)
> {
> struct iio_dev *indio_dev = dev_get_drvdata(dev);
> struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
> + int ret = 0;
>
> if (st->curr_sampl_freq == 0)
> return 0;
> @@ -652,13 +707,10 @@ static int __maybe_unused cros_ec_sensors_prepare(struct device *dev)
> * sleep. Set sampling to a long period if necessary.
> */
> if (st->curr_sampl_freq < CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY) {
> - mutex_lock(&st->cmd_lock);
> - st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
> - st->param.ec_rate.data = CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY;
> - cros_ec_motion_send_host_cmd(st, 0);
> - mutex_unlock(&st->cmd_lock);
> + ret = cros_ec_sensor_set_ec_rate(st,
> + CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY);
> }
> - return 0;
> + return ret;
> }
>
> static void __maybe_unused cros_ec_sensors_complete(struct device *dev)
> @@ -670,11 +722,7 @@ static void __maybe_unused cros_ec_sensors_complete(struct device *dev)
> return;
>
> if (st->curr_sampl_freq < CROS_EC_MIN_SUSPEND_SAMPLING_FREQUENCY) {
> - mutex_lock(&st->cmd_lock);
> - st->param.cmd = MOTIONSENSE_CMD_EC_RATE;
> - st->param.ec_rate.data = st->curr_sampl_freq;
> - cros_ec_motion_send_host_cmd(st, 0);
> - mutex_unlock(&st->cmd_lock);
> + cros_ec_sensor_set_ec_rate(st, st->curr_sampl_freq);
> }
> }
>
> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> index d58f010880ce..e9b0072d5c88 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -199,8 +199,7 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
>
> /* Common part */
> channel->info_mask_shared_by_all =
> - BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> - BIT(IIO_CHAN_INFO_FREQUENCY);
> + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> channel->info_mask_shared_by_all_available =
> BIT(IIO_CHAN_INFO_SAMP_FREQ);
> channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> diff --git a/drivers/iio/pressure/cros_ec_baro.c b/drivers/iio/pressure/cros_ec_baro.c
> index c7538e93d24f..aa3cae5a1a15 100644
> --- a/drivers/iio/pressure/cros_ec_baro.c
> +++ b/drivers/iio/pressure/cros_ec_baro.c
> @@ -148,8 +148,7 @@ static int cros_ec_baro_probe(struct platform_device *pdev)
> channel->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
> channel->info_mask_shared_by_all =
> BIT(IIO_CHAN_INFO_SCALE) |
> - BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> - BIT(IIO_CHAN_INFO_FREQUENCY);
> + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> channel->scan_type.shift = 0;

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