RE: [PATCH v2 1/4] iio: bmc150: Use i2c regmap

From: Tirdea, Irina
Date: Wed Sep 09 2015 - 10:37:42 EST



> -----Original Message-----
> From: Markus Pargmann [mailto:mpa@xxxxxxxxxxxxxx]
> Sent: 20 August, 2015 15:50
> To: Jonathan Cameron
> Cc: Srinivas Pandruvada; Tirdea, Irina; Lars-Peter Clausen; linux-iio@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx; Markus Pargmann
> Subject: [PATCH v2 1/4] iio: bmc150: Use i2c regmap
>
> This replaces all usage of direct i2c accesses with regmap accesses.
>
> Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
> ---

This patch works, but I would wait for the rebased version and check again.
One minor comment below.

> drivers/iio/accel/Kconfig | 2 +
> drivers/iio/accel/bmc150-accel.c | 219 +++++++++++++++++----------------------
> 2 files changed, 95 insertions(+), 126 deletions(-)
>
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 00e7bcbdbe24..01dd03d194d1 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -22,6 +22,8 @@ config BMC150_ACCEL
> depends on I2C
> select IIO_BUFFER
> select IIO_TRIGGERED_BUFFER
> + select REGMAP
> + select REGMAP_I2C
> help
> Say yes here to build support for the following Bosch accelerometers:
> BMC150, BMI055, BMA250E, BMA222E, BMA255, BMA280.
> diff --git a/drivers/iio/accel/bmc150-accel.c b/drivers/iio/accel/bmc150-accel.c
> index 55751d9e1ade..c5c773e75173 100644
> --- a/drivers/iio/accel/bmc150-accel.c
> +++ b/drivers/iio/accel/bmc150-accel.c
> @@ -35,6 +35,7 @@
> #include <linux/iio/trigger.h>
> #include <linux/iio/trigger_consumer.h>
> #include <linux/iio/triggered_buffer.h>
> +#include <linux/regmap.h>
>
> #define BMC150_ACCEL_DRV_NAME "bmc150_accel"
> #define BMC150_ACCEL_IRQ_NAME "bmc150_accel_event"
> @@ -185,6 +186,8 @@ enum bmc150_accel_trigger_id {
>
> struct bmc150_accel_data {
> struct i2c_client *client;
> + struct regmap *regmap;
> + struct device *dev;
> struct bmc150_accel_interrupt interrupts[BMC150_ACCEL_INTERRUPTS];
> atomic_t active_intr;
> struct bmc150_accel_trigger triggers[BMC150_ACCEL_TRIGGERS];
> @@ -241,6 +244,11 @@ static const struct {
> {500000, BMC150_ACCEL_SLEEP_500_MS},
> {1000000, BMC150_ACCEL_SLEEP_1_SEC} };
>
> +static const struct regmap_config bmc150_i2c_regmap_conf = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0x3f,
> +};
>
> static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
> enum bmc150_power_modes mode,
> @@ -270,8 +278,7 @@ static int bmc150_accel_set_mode(struct bmc150_accel_data *data,
>
> dev_dbg(&data->client->dev, "Set Mode bits %x\n", lpw_bits);
>
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_PMU_LPW, lpw_bits);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_LPW, lpw_bits);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n");
> return ret;
> @@ -289,8 +296,7 @@ static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
> for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) {
> if (bmc150_accel_samp_freq_table[i].val == val &&
> bmc150_accel_samp_freq_table[i].val2 == val2) {
> - ret = i2c_smbus_write_byte_data(
> - data->client,
> + ret = regmap_write(data->regmap,
> BMC150_ACCEL_REG_PMU_BW,
> bmc150_accel_samp_freq_table[i].bw_bits);
> if (ret < 0)
> @@ -307,26 +313,19 @@ static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val,
>
> static int bmc150_accel_update_slope(struct bmc150_accel_data *data)
> {
> - int ret, val;
> + int ret;
>
> - ret = i2c_smbus_write_byte_data(data->client, BMC150_ACCEL_REG_INT_6,
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_6,
> data->slope_thres);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_int_6\n");
> return ret;
> }
>
> - ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_INT_5);
> + ret = regmap_update_bits(data->regmap, BMC150_ACCEL_REG_INT_5,
> + BMC150_ACCEL_SLOPE_DUR_MASK, data->slope_dur);
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_5\n");
> - return ret;
> - }
> -
> - val = (ret & ~BMC150_ACCEL_SLOPE_DUR_MASK) | data->slope_dur;
> - ret = i2c_smbus_write_byte_data(data->client, BMC150_ACCEL_REG_INT_5,
> - val);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error write reg_int_5\n");
> + dev_err(&data->client->dev, "Error updating reg_int_5\n");
> return ret;
> }
>
> @@ -348,17 +347,18 @@ static int bmc150_accel_any_motion_setup(struct bmc150_accel_trigger *t,
> static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
> {
> int ret;
> + unsigned int val;
>
> - ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_CHIP_ID);
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_CHIP_ID, &val);
> if (ret < 0) {
> dev_err(&data->client->dev,
> "Error: Reading chip id\n");
> return ret;
> }
>
> - dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
> - if (ret != data->chip_info->chip_id) {
> - dev_err(&data->client->dev, "Invalid chip %x\n", ret);
> + dev_dbg(&data->client->dev, "Chip Id %x\n", val);
> + if (val != data->chip_info->chip_id) {
> + dev_err(&data->client->dev, "Invalid chip %x\n", val);
> return -ENODEV;
> }
>
> @@ -372,9 +372,8 @@ static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
> return ret;
>
> /* Set Default Range */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_PMU_RANGE,
> - BMC150_ACCEL_DEF_RANGE_4G);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_RANGE,
> + BMC150_ACCEL_DEF_RANGE_4G);
> if (ret < 0) {
> dev_err(&data->client->dev,
> "Error writing reg_pmu_range\n");
> @@ -391,10 +390,9 @@ static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
> return ret;
>
> /* Set default as latched interrupts */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_INT |
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> if (ret < 0) {
> dev_err(&data->client->dev,
> "Error writing reg_int_rst_latch\n");
> @@ -527,38 +525,18 @@ static int bmc150_accel_set_interrupt(struct bmc150_accel_data *data, int i,
> return ret;
>
> /* map the interrupt to the appropriate pins */
> - ret = i2c_smbus_read_byte_data(data->client, info->map_reg);
> + ret = regmap_update_bits(data->regmap, info->map_reg, info->map_bitmask,
> + (state ? info->map_bitmask : 0));
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_map\n");
> - goto out_fix_power_state;
> - }
> - if (state)
> - ret |= info->map_bitmask;
> - else
> - ret &= ~info->map_bitmask;
> -
> - ret = i2c_smbus_write_byte_data(data->client, info->map_reg,
> - ret);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_map\n");
> + dev_err(&data->client->dev, "Error updating reg_int_map\n");
> goto out_fix_power_state;
> }
>
> /* enable/disable the interrupt */
> - ret = i2c_smbus_read_byte_data(data->client, info->en_reg);
> + ret = regmap_update_bits(data->regmap, info->en_reg, info->en_bitmask,
> + (state ? info->en_bitmask : 0));
> if (ret < 0) {
> - dev_err(&data->client->dev, "Error reading reg_int_en\n");
> - goto out_fix_power_state;
> - }
> -
> - if (state)
> - ret |= info->en_bitmask;
> - else
> - ret &= ~info->en_bitmask;
> -
> - ret = i2c_smbus_write_byte_data(data->client, info->en_reg, ret);
> - if (ret < 0) {
> - dev_err(&data->client->dev, "Error writing reg_int_en\n");
> + dev_err(&data->client->dev, "Error updating reg_int_en\n");
> goto out_fix_power_state;
> }
>
> @@ -581,8 +559,7 @@ static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
>
> for (i = 0; i < ARRAY_SIZE(data->chip_info->scale_table); ++i) {
> if (data->chip_info->scale_table[i].scale == val) {
> - ret = i2c_smbus_write_byte_data(
> - data->client,
> + ret = regmap_write(data->regmap,
> BMC150_ACCEL_REG_PMU_RANGE,
> data->chip_info->scale_table[i].reg_range);
> if (ret < 0) {
> @@ -602,16 +579,17 @@ static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
> static int bmc150_accel_get_temp(struct bmc150_accel_data *data, int *val)
> {
> int ret;
> + unsigned int value;
>
> mutex_lock(&data->mutex);
>
> - ret = i2c_smbus_read_byte_data(data->client, BMC150_ACCEL_REG_TEMP);
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_TEMP, &value);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading reg_temp\n");
> mutex_unlock(&data->mutex);
> return ret;
> }
> - *val = sign_extend32(ret, 7);
> + *val = sign_extend32(value, 7);
>
> mutex_unlock(&data->mutex);
>
> @@ -624,6 +602,7 @@ static int bmc150_accel_get_axis(struct bmc150_accel_data *data,
> {
> int ret;
> int axis = chan->scan_index;
> + unsigned int raw_val;
>
> mutex_lock(&data->mutex);
> ret = bmc150_accel_set_power_state(data, true);
> @@ -632,15 +611,15 @@ static int bmc150_accel_get_axis(struct bmc150_accel_data *data,
> return ret;
> }
>
> - ret = i2c_smbus_read_word_data(data->client,
> - BMC150_ACCEL_AXIS_TO_REG(axis));
> + ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_AXIS_TO_REG(axis),
> + &raw_val, 2);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading axis %d\n", axis);
> bmc150_accel_set_power_state(data, false);
> mutex_unlock(&data->mutex);
> return ret;
> }
> - *val = sign_extend32(ret >> chan->scan_type.shift,
> + *val = sign_extend32(raw_val >> chan->scan_type.shift,
> chan->scan_type.realbits - 1);
> ret = bmc150_accel_set_power_state(data, false);
> mutex_unlock(&data->mutex);
> @@ -904,52 +883,34 @@ static int bmc150_accel_set_watermark(struct iio_dev *indio_dev, unsigned val)
> * We must read at least one full frame in one burst, otherwise the rest of the
> * frame data is discarded.
> */
> -static int bmc150_accel_fifo_transfer(const struct i2c_client *client,
> +static int bmc150_accel_fifo_transfer(struct bmc150_accel_data *data,
> char *buffer, int samples)
> {
> int sample_length = 3 * 2;
> - u8 reg_fifo_data = BMC150_ACCEL_REG_FIFO_DATA;
> - int ret = -EIO;
> -
> - if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> - struct i2c_msg msg[2] = {
> - {
> - .addr = client->addr,
> - .flags = 0,
> - .buf = &reg_fifo_data,
> - .len = sizeof(reg_fifo_data),
> - },
> - {
> - .addr = client->addr,
> - .flags = I2C_M_RD,
> - .buf = (u8 *)buffer,
> - .len = samples * sample_length,
> - }
> - };
> + int ret;
> + int total_length = samples * sample_length;
> + int i;
> + int step = regmap_get_raw_read_max(data->regmap);
>
> - ret = i2c_transfer(client->adapter, msg, 2);
> - if (ret != 2)
> - ret = -EIO;
> - else
> - ret = 0;
> - } else {
> - int i, step = I2C_SMBUS_BLOCK_MAX / sample_length;
> -
> - for (i = 0; i < samples * sample_length; i += step) {
> - ret = i2c_smbus_read_i2c_block_data(client,
> - reg_fifo_data, step,
> - &buffer[i]);
> - if (ret != step) {
> - ret = -EIO;
> - break;
> - }
> + if (!step || step > total_length)
> + step = total_length;
> + else if (step < total_length)
> + step = sample_length;
>
> - ret = 0;
> - }
> + /*
> + * Seems we have a bus with size limitation so we have to execute
> + * multiple reads
> + */
> + for (i = 0; i < total_length; i += step) {
> + ret = regmap_raw_read(data->regmap, BMC150_ACCEL_REG_FIFO_DATA,
> + &buffer[i], step);
> + if (ret)
> + break;
> }
>
> if (ret)
> - dev_err(&client->dev, "Error transferring data from fifo\n");
> + dev_err(data->dev, "Error transferring data from fifo in single steps of %zu\n",
> + step);

step is declared as int, so using %zu will generate the following warning at build:
drivers/iio/accel/bmc150-accel.c:859:4: warning: format '%zu' expects argument of type 'size_t', but argument 3 has type 'int' [-Wformat=]
step);
^
>
> return ret;
> }
> @@ -963,14 +924,15 @@ static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev,
> u16 buffer[BMC150_ACCEL_FIFO_LENGTH * 3];
> int64_t tstamp;
> uint64_t sample_period;
> - ret = i2c_smbus_read_byte_data(data->client,
> - BMC150_ACCEL_REG_FIFO_STATUS);
> + unsigned int val;
> +
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_FIFO_STATUS, &val);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading reg_fifo_status\n");
> return ret;
> }
>
> - count = ret & 0x7F;
> + count = val & 0x7F;
>
> if (!count)
> return 0;
> @@ -1009,7 +971,7 @@ static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev,
> if (samples && count > samples)
> count = samples;
>
> - ret = bmc150_accel_fifo_transfer(data->client, (u8 *)buffer, count);
> + ret = bmc150_accel_fifo_transfer(data, (u8 *)buffer, count);
> if (ret)
> return ret;
>
> @@ -1206,17 +1168,19 @@ static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p)
> struct iio_dev *indio_dev = pf->indio_dev;
> struct bmc150_accel_data *data = iio_priv(indio_dev);
> int bit, ret, i = 0;
> + unsigned int raw_val;
>
> mutex_lock(&data->mutex);
> for_each_set_bit(bit, indio_dev->active_scan_mask,
> indio_dev->masklength) {
> - ret = i2c_smbus_read_word_data(data->client,
> - BMC150_ACCEL_AXIS_TO_REG(bit));
> + ret = regmap_bulk_read(data->regmap,
> + BMC150_ACCEL_AXIS_TO_REG(bit), &raw_val,
> + 2);
> if (ret < 0) {
> mutex_unlock(&data->mutex);
> goto err_read;
> }
> - data->buffer[i++] = ret;
> + data->buffer[i++] = raw_val;
> }
> mutex_unlock(&data->mutex);
>
> @@ -1240,10 +1204,9 @@ static int bmc150_accel_trig_try_reen(struct iio_trigger *trig)
>
> mutex_lock(&data->mutex);
> /* clear any latched interrupt */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_INT |
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> mutex_unlock(&data->mutex);
> if (ret < 0) {
> dev_err(&data->client->dev,
> @@ -1300,34 +1263,34 @@ static int bmc150_accel_handle_roc_event(struct iio_dev *indio_dev)
> struct bmc150_accel_data *data = iio_priv(indio_dev);
> int dir;
> int ret;
> + unsigned int val;
>
> - ret = i2c_smbus_read_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_STATUS_2);
> + ret = regmap_read(data->regmap, BMC150_ACCEL_REG_INT_STATUS_2, &val);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error reading reg_int_status_2\n");
> return ret;
> }
>
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_SIGN)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_SIGN)
> dir = IIO_EV_DIR_FALLING;
> else
> dir = IIO_EV_DIR_RISING;
>
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_X)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_X)
> iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL,
> 0,
> IIO_MOD_X,
> IIO_EV_TYPE_ROC,
> dir),
> data->timestamp);
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_Y)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_Y)
> iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL,
> 0,
> IIO_MOD_Y,
> IIO_EV_TYPE_ROC,
> dir),
> data->timestamp);
> - if (ret & BMC150_ACCEL_ANY_MOTION_BIT_Z)
> + if (val & BMC150_ACCEL_ANY_MOTION_BIT_Z)
> iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ACCEL,
> 0,
> IIO_MOD_Z,
> @@ -1360,10 +1323,9 @@ static irqreturn_t bmc150_accel_irq_thread_handler(int irq, void *private)
> }
>
> if (ack) {
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_INT |
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_INT |
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> if (ret)
> dev_err(&data->client->dev, "Error writing reg_int_rst_latch\n");
> ret = IRQ_HANDLED;
> @@ -1516,7 +1478,7 @@ static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data)
> u8 reg = BMC150_ACCEL_REG_FIFO_CONFIG1;
> int ret;
>
> - ret = i2c_smbus_write_byte_data(data->client, reg, data->fifo_mode);
> + ret = regmap_write(data->regmap, reg, data->fifo_mode);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_fifo_config1\n");
> return ret;
> @@ -1525,9 +1487,8 @@ static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data)
> if (!data->fifo_mode)
> return 0;
>
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_FIFO_CONFIG0,
> - data->watermark);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_FIFO_CONFIG0,
> + data->watermark);
> if (ret < 0)
> dev_err(&data->client->dev, "Error writing reg_fifo_config0\n");
>
> @@ -1627,6 +1588,13 @@ static int bmc150_accel_probe(struct i2c_client *client,
> data = iio_priv(indio_dev);
> i2c_set_clientdata(client, indio_dev);
> data->client = client;
> + data->dev = &client->dev;
> +
> + data->regmap = devm_regmap_init_i2c(client, &bmc150_i2c_regmap_conf);
> + if (IS_ERR(data->regmap)) {
> + dev_err(&client->dev, "Failed to initialize i2c regmap\n");
> + return PTR_ERR(data->regmap);
> + }
>
> if (id) {
> name = id->name;
> @@ -1680,9 +1648,8 @@ static int bmc150_accel_probe(struct i2c_client *client,
> * want to use latch mode when we can to prevent interrupt
> * flooding.
> */
> - ret = i2c_smbus_write_byte_data(data->client,
> - BMC150_ACCEL_REG_INT_RST_LATCH,
> - BMC150_ACCEL_INT_MODE_LATCH_RESET);
> + ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH,
> + BMC150_ACCEL_INT_MODE_LATCH_RESET);
> if (ret < 0) {
> dev_err(&data->client->dev, "Error writing reg_int_rst_latch\n");
> goto err_buffer_cleanup;
> --
> 2.4.6

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