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Commit c91a88ef authored by Mikko Koivunen's avatar Mikko Koivunen Committed by Jonathan Cameron
Browse files

iio: light: rpr0521 sample_frequency read/write 



Add sysfs read/write sample frequency.

Signed-off-by: default avatarMikko Koivunen <mikko.koivunen@fi.rohmeurope.com>
Acked-by: default avatarDaniel Baluta <daniel.baluta@nxp.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 624c389e

drivers/iio/light/rpr0521.c

+117 −0
Original line number Diff line number Diff line
@@ -132,6 +132,30 @@ static const struct rpr0521_gain_info { 
	},

};



struct rpr0521_samp_freq {

	int	als_hz;

	int	als_uhz;

	int	pxs_hz;

	int	pxs_uhz;

};



static const struct rpr0521_samp_freq rpr0521_samp_freq_i[13] = {

/*	{ALS, PXS},		   W==currently writable option */

	{0, 0, 0, 0},		/* W0000, 0=standby */

	{0, 0, 100, 0},		/*  0001 */

	{0, 0, 25, 0},		/*  0010 */

	{0, 0, 10, 0},		/*  0011 */

	{0, 0, 2, 500000},	/*  0100 */

	{10, 0, 20, 0},		/*  0101 */

	{10, 0, 10, 0},		/* W0110 */

	{10, 0, 2, 500000},	/*  0111 */

	{2, 500000, 20, 0},	/*  1000, measurement 100ms, sleep 300ms */

	{2, 500000, 10, 0},	/*  1001, measurement 100ms, sleep 300ms */

	{2, 500000, 0, 0},	/*  1010, high sensitivity mode */

	{2, 500000, 2, 500000},	/* W1011, high sensitivity mode */

	{20, 0, 20, 0}	/* 1100, ALS_data x 0.5, see specification P.18 */

};



struct rpr0521_data {

	struct i2c_client *client;
@@ -154,9 +178,16 @@ struct rpr0521_data { 
static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);

static IIO_CONST_ATTR(in_proximity_scale_available, RPR0521_PXS_SCALE_AVAIL);



/*

 * Start with easy freq first, whole table of freq combinations is more

 * complicated.

 */

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2.5 10");



static struct attribute *rpr0521_attributes[] = {

	&iio_const_attr_in_intensity_scale_available.dev_attr.attr,

	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,

	&iio_const_attr_sampling_frequency_available.dev_attr.attr,

	NULL,

};
@@ -172,6 +203,7 @@ static const struct iio_chan_spec rpr0521_channels[] = { 
		.channel2 = IIO_MOD_LIGHT_BOTH,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

			BIT(IIO_CHAN_INFO_SCALE),

		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),

	},

	{

		.type = IIO_INTENSITY,
@@ -180,12 +212,14 @@ static const struct iio_chan_spec rpr0521_channels[] = { 
		.channel2 = IIO_MOD_LIGHT_IR,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

			BIT(IIO_CHAN_INFO_SCALE),

		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),

	},

	{

		.type = IIO_PROXIMITY,

		.address = RPR0521_CHAN_PXS,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

			BIT(IIO_CHAN_INFO_SCALE),

		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),

	}

};
@@ -331,6 +365,72 @@ static int rpr0521_set_gain(struct rpr0521_data *data, int chan, 
				  idx << rpr0521_gain[chan].shift);

}



static int rpr0521_read_samp_freq(struct rpr0521_data *data,

				enum iio_chan_type chan_type,

			    int *val, int *val2)

{

	int reg, ret;



	ret = regmap_read(data->regmap, RPR0521_REG_MODE_CTRL, &reg);

	if (ret < 0)

		return ret;



	reg &= RPR0521_MODE_MEAS_TIME_MASK;

	if (reg >= ARRAY_SIZE(rpr0521_samp_freq_i))

		return -EINVAL;



	switch (chan_type) {

	case IIO_INTENSITY:

		*val = rpr0521_samp_freq_i[reg].als_hz;

		*val2 = rpr0521_samp_freq_i[reg].als_uhz;

		return 0;



	case IIO_PROXIMITY:

		*val = rpr0521_samp_freq_i[reg].pxs_hz;

		*val2 = rpr0521_samp_freq_i[reg].pxs_uhz;

		return 0;



	default:

		return -EINVAL;

	}

}



static int rpr0521_write_samp_freq_common(struct rpr0521_data *data,

				enum iio_chan_type chan_type,

				int val, int val2)

{

	int i;



	/*

	 * Ignore channel

	 * both pxs and als are setup only to same freq because of simplicity

	 */

	switch (val) {

	case 0:

		i = 0;

		break;



	case 2:

		if (val2 != 500000)

			return -EINVAL;



		i = 11;

		break;



	case 10:

		i = 6;

		break;



	default:

		return -EINVAL;

	}



	return regmap_update_bits(data->regmap,

		RPR0521_REG_MODE_CTRL,

		RPR0521_MODE_MEAS_TIME_MASK,

		i);

}



static int rpr0521_read_raw(struct iio_dev *indio_dev,

			    struct iio_chan_spec const *chan, int *val,

			    int *val2, long mask)
@@ -381,6 +481,15 @@ static int rpr0521_read_raw(struct iio_dev *indio_dev, 


		return IIO_VAL_INT_PLUS_MICRO;



	case IIO_CHAN_INFO_SAMP_FREQ:

		mutex_lock(&data->lock);

		ret = rpr0521_read_samp_freq(data, chan->type, val, val2);

		mutex_unlock(&data->lock);

		if (ret < 0)

			return ret;



		return IIO_VAL_INT_PLUS_MICRO;



	default:

		return -EINVAL;

	}
@@ -401,6 +510,14 @@ static int rpr0521_write_raw(struct iio_dev *indio_dev, 


		return ret;



	case IIO_CHAN_INFO_SAMP_FREQ:

		mutex_lock(&data->lock);

		ret = rpr0521_write_samp_freq_common(data, chan->type,

						     val, val2);

		mutex_unlock(&data->lock);



		return ret;



	default:

		return -EINVAL;

	}