Re: [PATCH v3 1/6] iio: bmg160: Use i2c regmap instead of direct i2c access

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On 15/08/15 15:41, Jonathan Cameron wrote:
> On 12/08/15 17:01, Srinivas Pandruvada wrote:
>> On Wed, 2015-08-12 at 16:50 +0200, Markus Pargmann wrote:
>>> This patch introduces regmap usage into the driver. This is done to
>>> later easily support the SPI interface of this chip.
>>>
>>> Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
>> Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
> Applied to the togreg branch of iio.git.  Initially pushed out as testing.
> Unfortunately these have probably just missed the merge window for this
> cycle. I'll get them to Greg and hence into linux-next in about 3-4 weeks
> time.
> 
> Jonathan
One slight quirk from build test. I've added a static below.
>>> ---
>>>  drivers/iio/gyro/Kconfig  |   1 +
>>>  drivers/iio/gyro/bmg160.c | 198 ++++++++++++++++++++--------------------------
>>>  2 files changed, 88 insertions(+), 111 deletions(-)
>>>
>>> diff --git a/drivers/iio/gyro/Kconfig b/drivers/iio/gyro/Kconfig
>>> index 8d2439345673..cf82d74139a2 100644
>>> --- a/drivers/iio/gyro/Kconfig
>>> +++ b/drivers/iio/gyro/Kconfig
>>> @@ -55,6 +55,7 @@ config BMG160
>>>  	depends on I2C
>>>  	select IIO_BUFFER
>>>  	select IIO_TRIGGERED_BUFFER
>>> +	select REGMAP_I2C
>>>  	help
>>>  	  Say yes here to build support for Bosch BMG160 Tri-axis Gyro Sensor
>>>  	  driver. This driver also supports BMI055 gyroscope.
>>> diff --git a/drivers/iio/gyro/bmg160.c b/drivers/iio/gyro/bmg160.c
>>> index 460bf715d541..bbe02053e98a 100644
>>> --- a/drivers/iio/gyro/bmg160.c
>>> +++ b/drivers/iio/gyro/bmg160.c
>>> @@ -28,6 +28,7 @@
>>>  #include <linux/iio/events.h>
>>>  #include <linux/iio/trigger_consumer.h>
>>>  #include <linux/iio/triggered_buffer.h>
>>> +#include <linux/regmap.h>
>>>  
>>>  #define BMG160_DRV_NAME		"bmg160"
>>>  #define BMG160_IRQ_NAME		"bmg160_event"
>>> @@ -98,6 +99,7 @@
>>>  
>>>  struct bmg160_data {
>>>  	struct i2c_client *client;
>>> +	struct regmap *regmap;
>>>  	struct iio_trigger *dready_trig;
>>>  	struct iio_trigger *motion_trig;
>>>  	struct mutex mutex;
>>> @@ -134,12 +136,17 @@ static const struct {
>>>  			   { 133, BMG160_RANGE_250DPS},
>>>  			   { 66, BMG160_RANGE_125DPS} };
>>>  
>>> +struct regmap_config bmg160_regmap_i2c_conf = {
Should be static.

>>> +	.reg_bits = 8,
>>> +	.val_bits = 8,
>>> +	.max_register = 0x3f
>>> +};
>>> +
>>>  static int bmg160_set_mode(struct bmg160_data *data, u8 mode)
>>>  {
>>>  	int ret;
>>>  
>>> -	ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_PMU_LPW, mode);
>>> +	ret = regmap_write(data->regmap, BMG160_REG_PMU_LPW, mode);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error writing reg_pmu_lpw\n");
>>>  		return ret;
>>> @@ -169,8 +176,7 @@ static int bmg160_set_bw(struct bmg160_data *data, int val)
>>>  	if (bw_bits < 0)
>>>  		return bw_bits;
>>>  
>>> -	ret = i2c_smbus_write_byte_data(data->client, BMG160_REG_PMU_BW,
>>> -					bw_bits);
>>> +	ret = regmap_write(data->regmap, BMG160_REG_PMU_BW, bw_bits);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error writing reg_pmu_bw\n");
>>>  		return ret;
>>> @@ -184,16 +190,17 @@ static int bmg160_set_bw(struct bmg160_data *data, int val)
>>>  static int bmg160_chip_init(struct bmg160_data *data)
>>>  {
>>>  	int ret;
>>> +	unsigned int val;
>>>  
>>> -	ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_CHIP_ID);
>>> +	ret = regmap_read(data->regmap, BMG160_REG_CHIP_ID, &val);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error reading reg_chip_id\n");
>>>  		return ret;
>>>  	}
>>>  
>>> -	dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
>>> -	if (ret != BMG160_CHIP_ID_VAL) {
>>> -		dev_err(&data->client->dev, "invalid chip %x\n", ret);
>>> +	dev_dbg(&data->client->dev, "Chip Id %x\n", val);
>>> +	if (val != BMG160_CHIP_ID_VAL) {
>>> +		dev_err(&data->client->dev, "invalid chip %x\n", val);
>>>  		return -ENODEV;
>>>  	}
>>>  
>>> @@ -210,40 +217,31 @@ static int bmg160_chip_init(struct bmg160_data *data)
>>>  		return ret;
>>>  
>>>  	/* Set Default Range */
>>> -	ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_RANGE,
>>> -					BMG160_RANGE_500DPS);
>>> +	ret = regmap_write(data->regmap, BMG160_REG_RANGE, BMG160_RANGE_500DPS);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error writing reg_range\n");
>>>  		return ret;
>>>  	}
>>>  	data->dps_range = BMG160_RANGE_500DPS;
>>>  
>>> -	ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_SLOPE_THRES);
>>> +	ret = regmap_read(data->regmap, BMG160_REG_SLOPE_THRES, &val);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error reading reg_slope_thres\n");
>>>  		return ret;
>>>  	}
>>> -	data->slope_thres = ret;
>>> +	data->slope_thres = val;
>>>  
>>>  	/* Set default interrupt mode */
>>> -	ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_EN_1);
>>> -	if (ret < 0) {
>>> -		dev_err(&data->client->dev, "Error reading reg_int_en_1\n");
>>> -		return ret;
>>> -	}
>>> -	ret &= ~BMG160_INT1_BIT_OD;
>>> -	ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_INT_EN_1, ret);
>>> +	ret = regmap_update_bits(data->regmap, BMG160_REG_INT_EN_1,
>>> +				 BMG160_INT1_BIT_OD, 0);
>>>  	if (ret < 0) {
>>> -		dev_err(&data->client->dev, "Error writing reg_int_en_1\n");
>>> +		dev_err(&data->client->dev, "Error updating bits in reg_int_en_1\n");
>>>  		return ret;
>>>  	}
>>>  
>>> -	ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_INT_RST_LATCH,
>>> -					BMG160_INT_MODE_LATCH_INT |
>>> -					BMG160_INT_MODE_LATCH_RESET);
>>> +	ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
>>> +			   BMG160_INT_MODE_LATCH_INT |
>>> +			   BMG160_INT_MODE_LATCH_RESET);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev,
>>>  			"Error writing reg_motion_intr\n");
>>> @@ -284,41 +282,28 @@ static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
>>>  	int ret;
>>>  
>>>  	/* Enable/Disable INT_MAP0 mapping */
>>> -	ret = i2c_smbus_read_byte_data(data->client,  BMG160_REG_INT_MAP_0);
>>> -	if (ret < 0) {
>>> -		dev_err(&data->client->dev, "Error reading reg_int_map0\n");
>>> -		return ret;
>>> -	}
>>> -	if (status)
>>> -		ret |= BMG160_INT_MAP_0_BIT_ANY;
>>> -	else
>>> -		ret &= ~BMG160_INT_MAP_0_BIT_ANY;
>>> -
>>> -	ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_INT_MAP_0,
>>> -					ret);
>>> +	ret = regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_0,
>>> +				 BMG160_INT_MAP_0_BIT_ANY,
>>> +				 (status ? BMG160_INT_MAP_0_BIT_ANY : 0));
>>>  	if (ret < 0) {
>>> -		dev_err(&data->client->dev, "Error writing reg_int_map0\n");
>>> +		dev_err(&data->client->dev, "Error updating bits reg_int_map0\n");
>>>  		return ret;
>>>  	}
>>>  
>>>  	/* Enable/Disable slope interrupts */
>>>  	if (status) {
>>>  		/* Update slope thres */
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_SLOPE_THRES,
>>> -						data->slope_thres);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_SLOPE_THRES,
>>> +				   data->slope_thres);
>>>  		if (ret < 0) {
>>>  			dev_err(&data->client->dev,
>>>  				"Error writing reg_slope_thres\n");
>>>  			return ret;
>>>  		}
>>>  
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_MOTION_INTR,
>>> -						BMG160_INT_MOTION_X |
>>> -						BMG160_INT_MOTION_Y |
>>> -						BMG160_INT_MOTION_Z);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_MOTION_INTR,
>>> +				   BMG160_INT_MOTION_X | BMG160_INT_MOTION_Y |
>>> +				   BMG160_INT_MOTION_Z);
>>>  		if (ret < 0) {
>>>  			dev_err(&data->client->dev,
>>>  				"Error writing reg_motion_intr\n");
>>> @@ -331,10 +316,10 @@ static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
>>>  		 * to set latched mode, we will be flooded anyway with INTR
>>>  		 */
>>>  		if (!data->dready_trigger_on) {
>>> -			ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_INT_RST_LATCH,
>>> -						BMG160_INT_MODE_LATCH_INT |
>>> -						BMG160_INT_MODE_LATCH_RESET);
>>> +			ret = regmap_write(data->regmap,
>>> +					   BMG160_REG_INT_RST_LATCH,
>>> +					   BMG160_INT_MODE_LATCH_INT |
>>> +					   BMG160_INT_MODE_LATCH_RESET);
>>>  			if (ret < 0) {
>>>  				dev_err(&data->client->dev,
>>>  					"Error writing reg_rst_latch\n");
>>> @@ -342,14 +327,12 @@ static int bmg160_setup_any_motion_interrupt(struct bmg160_data *data,
>>>  			}
>>>  		}
>>>  
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_INT_EN_0,
>>> -						BMG160_DATA_ENABLE_INT);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0,
>>> +				   BMG160_DATA_ENABLE_INT);
>>>  
>>> -	} else
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_INT_EN_0,
>>> -						0);
>>> +	} else {
>>> +		ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0);
>>> +	}
>>>  
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error writing reg_int_en0\n");
>>> @@ -365,55 +348,39 @@ static int bmg160_setup_new_data_interrupt(struct bmg160_data *data,
>>>  	int ret;
>>>  
>>>  	/* Enable/Disable INT_MAP1 mapping */
>>> -	ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_MAP_1);
>>> -	if (ret < 0) {
>>> -		dev_err(&data->client->dev, "Error reading reg_int_map1\n");
>>> -		return ret;
>>> -	}
>>> -
>>> -	if (status)
>>> -		ret |= BMG160_INT_MAP_1_BIT_NEW_DATA;
>>> -	else
>>> -		ret &= ~BMG160_INT_MAP_1_BIT_NEW_DATA;
>>> -
>>> -	ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_INT_MAP_1,
>>> -					ret);
>>> +	ret = regmap_update_bits(data->regmap, BMG160_REG_INT_MAP_1,
>>> +				 BMG160_INT_MAP_1_BIT_NEW_DATA,
>>> +				 (status ? BMG160_INT_MAP_1_BIT_NEW_DATA : 0));
>>>  	if (ret < 0) {
>>> -		dev_err(&data->client->dev, "Error writing reg_int_map1\n");
>>> +		dev_err(&data->client->dev, "Error updating bits in reg_int_map1\n");
>>>  		return ret;
>>>  	}
>>>  
>>>  	if (status) {
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_INT_RST_LATCH,
>>> -						BMG160_INT_MODE_NON_LATCH_INT |
>>> -						BMG160_INT_MODE_LATCH_RESET);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
>>> +				   BMG160_INT_MODE_NON_LATCH_INT |
>>> +				   BMG160_INT_MODE_LATCH_RESET);
>>>  		if (ret < 0) {
>>>  			dev_err(&data->client->dev,
>>>  				"Error writing reg_rst_latch\n");
>>>  				return ret;
>>>  		}
>>>  
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_INT_EN_0,
>>> -						BMG160_DATA_ENABLE_INT);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0,
>>> +				   BMG160_DATA_ENABLE_INT);
>>>  
>>>  	} else {
>>>  		/* Restore interrupt mode */
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_INT_RST_LATCH,
>>> -						BMG160_INT_MODE_LATCH_INT |
>>> -						BMG160_INT_MODE_LATCH_RESET);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
>>> +				   BMG160_INT_MODE_LATCH_INT |
>>> +				   BMG160_INT_MODE_LATCH_RESET);
>>>  		if (ret < 0) {
>>>  			dev_err(&data->client->dev,
>>>  				"Error writing reg_rst_latch\n");
>>>  				return ret;
>>>  		}
>>>  
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -						BMG160_REG_INT_EN_0,
>>> -						0);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_INT_EN_0, 0);
>>>  	}
>>>  
>>>  	if (ret < 0) {
>>> @@ -444,10 +411,8 @@ static int bmg160_set_scale(struct bmg160_data *data, int val)
>>>  
>>>  	for (i = 0; i < ARRAY_SIZE(bmg160_scale_table); ++i) {
>>>  		if (bmg160_scale_table[i].scale == val) {
>>> -			ret = i2c_smbus_write_byte_data(
>>> -					data->client,
>>> -					BMG160_REG_RANGE,
>>> -					bmg160_scale_table[i].dps_range);
>>> +			ret = regmap_write(data->regmap, BMG160_REG_RANGE,
>>> +					   bmg160_scale_table[i].dps_range);
>>>  			if (ret < 0) {
>>>  				dev_err(&data->client->dev,
>>>  					"Error writing reg_range\n");
>>> @@ -464,6 +429,7 @@ static int bmg160_set_scale(struct bmg160_data *data, int val)
>>>  static int bmg160_get_temp(struct bmg160_data *data, int *val)
>>>  {
>>>  	int ret;
>>> +	unsigned int raw_val;
>>>  
>>>  	mutex_lock(&data->mutex);
>>>  	ret = bmg160_set_power_state(data, true);
>>> @@ -472,7 +438,7 @@ static int bmg160_get_temp(struct bmg160_data *data, int *val)
>>>  		return ret;
>>>  	}
>>>  
>>> -	ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_TEMP);
>>> +	ret = regmap_read(data->regmap, BMG160_REG_TEMP, &raw_val);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error reading reg_temp\n");
>>>  		bmg160_set_power_state(data, false);
>>> @@ -480,7 +446,7 @@ static int bmg160_get_temp(struct bmg160_data *data, int *val)
>>>  		return ret;
>>>  	}
>>>  
>>> -	*val = sign_extend32(ret, 7);
>>> +	*val = sign_extend32(raw_val, 7);
>>>  	ret = bmg160_set_power_state(data, false);
>>>  	mutex_unlock(&data->mutex);
>>>  	if (ret < 0)
>>> @@ -492,6 +458,7 @@ static int bmg160_get_temp(struct bmg160_data *data, int *val)
>>>  static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
>>>  {
>>>  	int ret;
>>> +	unsigned int raw_val;
>>>  
>>>  	mutex_lock(&data->mutex);
>>>  	ret = bmg160_set_power_state(data, true);
>>> @@ -500,7 +467,8 @@ static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
>>>  		return ret;
>>>  	}
>>>  
>>> -	ret = i2c_smbus_read_word_data(data->client, BMG160_AXIS_TO_REG(axis));
>>> +	ret = regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(axis), &raw_val,
>>> +			       2);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error reading axis %d\n", axis);
>>>  		bmg160_set_power_state(data, false);
>>> @@ -508,7 +476,7 @@ static int bmg160_get_axis(struct bmg160_data *data, int axis, int *val)
>>>  		return ret;
>>>  	}
>>>  
>>> -	*val = sign_extend32(ret, 15);
>>> +	*val = sign_extend32(raw_val, 15);
>>>  	ret = bmg160_set_power_state(data, false);
>>>  	mutex_unlock(&data->mutex);
>>>  	if (ret < 0)
>>> @@ -807,12 +775,13 @@ static irqreturn_t bmg160_trigger_handler(int irq, void *p)
>>>  	struct iio_dev *indio_dev = pf->indio_dev;
>>>  	struct bmg160_data *data = iio_priv(indio_dev);
>>>  	int bit, ret, i = 0;
>>> +	unsigned int 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,
>>> -					       BMG160_AXIS_TO_REG(bit));
>>> +		ret = regmap_bulk_read(data->regmap, BMG160_AXIS_TO_REG(bit),
>>> +				       &val, 2);
>>>  		if (ret < 0) {
>>>  			mutex_unlock(&data->mutex);
>>>  			goto err;
>>> @@ -840,10 +809,9 @@ static int bmg160_trig_try_reen(struct iio_trigger *trig)
>>>  		return 0;
>>>  
>>>  	/* Set latched mode interrupt and clear any latched interrupt */
>>> -	ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_INT_RST_LATCH,
>>> -					BMG160_INT_MODE_LATCH_INT |
>>> -					BMG160_INT_MODE_LATCH_RESET);
>>> +	ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
>>> +			   BMG160_INT_MODE_LATCH_INT |
>>> +			   BMG160_INT_MODE_LATCH_RESET);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error writing reg_rst_latch\n");
>>>  		return ret;
>>> @@ -907,33 +875,34 @@ static irqreturn_t bmg160_event_handler(int irq, void *private)
>>>  	struct bmg160_data *data = iio_priv(indio_dev);
>>>  	int ret;
>>>  	int dir;
>>> +	unsigned int val;
>>>  
>>> -	ret = i2c_smbus_read_byte_data(data->client, BMG160_REG_INT_STATUS_2);
>>> +	ret = regmap_read(data->regmap, BMG160_REG_INT_STATUS_2, &val);
>>>  	if (ret < 0) {
>>>  		dev_err(&data->client->dev, "Error reading reg_int_status2\n");
>>>  		goto ack_intr_status;
>>>  	}
>>>  
>>> -	if (ret & 0x08)
>>> +	if (val & 0x08)
>>>  		dir = IIO_EV_DIR_RISING;
>>>  	else
>>>  		dir = IIO_EV_DIR_FALLING;
>>>  
>>> -	if (ret & BMG160_ANY_MOTION_BIT_X)
>>> +	if (val & BMG160_ANY_MOTION_BIT_X)
>>>  		iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
>>>  							0,
>>>  							IIO_MOD_X,
>>>  							IIO_EV_TYPE_ROC,
>>>  							dir),
>>>  							iio_get_time_ns());
>>> -	if (ret & BMG160_ANY_MOTION_BIT_Y)
>>> +	if (val & BMG160_ANY_MOTION_BIT_Y)
>>>  		iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
>>>  							0,
>>>  							IIO_MOD_Y,
>>>  							IIO_EV_TYPE_ROC,
>>>  							dir),
>>>  							iio_get_time_ns());
>>> -	if (ret & BMG160_ANY_MOTION_BIT_Z)
>>> +	if (val & BMG160_ANY_MOTION_BIT_Z)
>>>  		iio_push_event(indio_dev, IIO_MOD_EVENT_CODE(IIO_ANGL_VEL,
>>>  							0,
>>>  							IIO_MOD_Z,
>>> @@ -943,10 +912,9 @@ static irqreturn_t bmg160_event_handler(int irq, void *private)
>>>  
>>>  ack_intr_status:
>>>  	if (!data->dready_trigger_on) {
>>> -		ret = i2c_smbus_write_byte_data(data->client,
>>> -					BMG160_REG_INT_RST_LATCH,
>>> -					BMG160_INT_MODE_LATCH_INT |
>>> -					BMG160_INT_MODE_LATCH_RESET);
>>> +		ret = regmap_write(data->regmap, BMG160_REG_INT_RST_LATCH,
>>> +				   BMG160_INT_MODE_LATCH_INT |
>>> +				   BMG160_INT_MODE_LATCH_RESET);
>>>  		if (ret < 0)
>>>  			dev_err(&data->client->dev,
>>>  				"Error writing reg_rst_latch\n");
>>> @@ -1038,6 +1006,14 @@ static int bmg160_probe(struct i2c_client *client,
>>>  	struct iio_dev *indio_dev;
>>>  	int ret;
>>>  	const char *name = NULL;
>>> +	struct regmap *regmap;
>>> +
>>> +	regmap = devm_regmap_init_i2c(client, &bmg160_regmap_i2c_conf);
>>> +	if (IS_ERR(regmap)) {
>>> +		dev_err(&client->dev, "Failed to register i2c regmap %d\n",
>>> +			(int)PTR_ERR(regmap));
>>> +		return PTR_ERR(regmap);
>>> +	}
>>>  
>>>  	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
>>>  	if (!indio_dev)
>>
>>
> 
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