Commit eb2c9ce2 authored by Tiberiu Breana's avatar Tiberiu Breana Committed by Jonathan Cameron
Browse files

iio: accel: Add sampling rate support for STK8BA50 



Added support for setting the STK8BA50 accelerometer's
sampling rate.

Signed-off-by: default avatarTiberiu Breana <tiberiu.a.breana@intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 003f4880

drivers/iio/accel/stk8ba50.c

+50 −7
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#define STK8BA50_REG_YOUT			0x04

#define STK8BA50_REG_ZOUT			0x06

#define STK8BA50_REG_RANGE			0x0F

#define STK8BA50_REG_BWSEL			0x10

#define STK8BA50_REG_POWMODE			0x11

#define STK8BA50_REG_SWRST			0x14
@@ -29,6 +30,7 @@ 
#define STK8BA50_MODE_POWERBIT			BIT(7)

#define STK8BA50_DATA_SHIFT			6

#define STK8BA50_RESET_CMD			0xB6

#define STK8BA50_SR_1792HZ_IDX			7



#define STK8BA50_DRIVER_NAME			"stk8ba50"
@@ -57,10 +59,20 @@ static const struct { 
	{3, 38400}, {5, 76700}, {8, 153400}, {12, 306900}

};



/* Sample rates are stored as { <register value>, <Hz value> } */

static const struct {

	u8 reg_val;

	u16 samp_freq;

} stk8ba50_samp_freq_table[] = {

	{0x08, 14},  {0x09, 25},  {0x0A, 56},  {0x0B, 112},

	{0x0C, 224}, {0x0D, 448}, {0x0E, 896}, {0x0F, 1792}

};



struct stk8ba50_data {

	struct i2c_client *client;

	struct mutex lock;

	int range;

	u8 sample_rate_idx;

};



#define STK8BA50_ACCEL_CHANNEL(reg, axis) {				\
@@ -70,6 +82,7 @@ struct stk8ba50_data { 
	.channel2 = IIO_MOD_##axis,					\

	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\

	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\

				    BIT(IIO_CHAN_INFO_SAMP_FREQ),	\

}



static const struct iio_chan_spec stk8ba50_channels[] = {
@@ -80,8 +93,11 @@ static const struct iio_chan_spec stk8ba50_channels[] = { 


static IIO_CONST_ATTR(in_accel_scale_available, STK8BA50_SCALE_AVAIL);



static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("14 25 56 112 224 448 896 1792");



static struct attribute *stk8ba50_attributes[] = {

	&iio_const_attr_in_accel_scale_available.dev_attr.attr,

	&iio_const_attr_sampling_frequency_available.dev_attr.attr,

	NULL,

};
@@ -119,6 +135,11 @@ static int stk8ba50_read_raw(struct iio_dev *indio_dev, 
		*val = 0;

		*val2 = stk8ba50_scale_table[data->range].scale_val;

		return IIO_VAL_INT_PLUS_MICRO;

	case IIO_CHAN_INFO_SAMP_FREQ:

		*val = stk8ba50_samp_freq_table

				[data->sample_rate_idx].samp_freq;

		*val2 = 0;

		return IIO_VAL_INT;

	}



	return -EINVAL;
@@ -155,6 +176,25 @@ static int stk8ba50_write_raw(struct iio_dev *indio_dev, 
		else

			data->range = index;



		return ret;

	case IIO_CHAN_INFO_SAMP_FREQ:

		for (i = 0; i < ARRAY_SIZE(stk8ba50_samp_freq_table); i++)

			if (val == stk8ba50_samp_freq_table[i].samp_freq) {

				index = i;

				break;

			}

		if (index < 0)

			return -EINVAL;



		ret = i2c_smbus_write_byte_data(data->client,

				STK8BA50_REG_BWSEL,

				stk8ba50_samp_freq_table[index].reg_val);

		if (ret < 0)

			dev_err(&data->client->dev,

					"failed to set sampling rate\n");

		else

			data->sample_rate_idx = index;



		return ret;

	}
@@ -231,6 +271,9 @@ static int stk8ba50_probe(struct i2c_client *client, 
	/* The default range is +/-2g */

	data->range = 0;



	/* The default sampling rate is 1792 Hz (maximum) */

	data->sample_rate_idx = STK8BA50_SR_1792HZ_IDX;



	ret = iio_device_register(indio_dev);

	if (ret < 0) {

		dev_err(&client->dev, "device_register failed\n");