Commit 734c4423 authored by Mikko Koivunen's avatar Mikko Koivunen Committed by Jonathan Cameron
Browse files

iio: light: rpr0521 proximity offset read/write 



Add sysfs read/write proximity offset feature. Offset is read/write from
sensor registers. Values are proximity raw 10-bit values. After applying
offset value, output values will be (measured_raw - offset_value). Output
values are unsigned so offset value doesn't make output negative.

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 c91a88ef

drivers/iio/light/rpr0521.c

+52 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#define RPR0521_REG_PXS_DATA		0x44 /* 16-bit, little endian */

#define RPR0521_REG_ALS_DATA0		0x46 /* 16-bit, little endian */

#define RPR0521_REG_ALS_DATA1		0x48 /* 16-bit, little endian */

#define RPR0521_REG_PS_OFFSET_LSB	0x53

#define RPR0521_REG_ID			0x92



#define RPR0521_MODE_ALS_MASK		BIT(7)
@@ -218,6 +219,7 @@ static const struct iio_chan_spec rpr0521_channels[] = { 
		.type = IIO_PROXIMITY,

		.address = RPR0521_CHAN_PXS,

		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

			BIT(IIO_CHAN_INFO_OFFSET) |

			BIT(IIO_CHAN_INFO_SCALE),

		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),

	}
@@ -431,6 +433,40 @@ static int rpr0521_write_samp_freq_common(struct rpr0521_data *data, 
		i);

}



static int rpr0521_read_ps_offset(struct rpr0521_data *data, int *offset)

{

	int ret;

	__le16 buffer;



	ret = regmap_bulk_read(data->regmap,

		RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));



	if (ret < 0) {

		dev_err(&data->client->dev, "Failed to read PS OFFSET register\n");

		return ret;

	}

	*offset = le16_to_cpu(buffer);



	return ret;

}



static int rpr0521_write_ps_offset(struct rpr0521_data *data, int offset)

{

	int ret;

	__le16 buffer;



	buffer = cpu_to_le16(offset & 0x3ff);

	ret = regmap_raw_write(data->regmap,

		RPR0521_REG_PS_OFFSET_LSB, &buffer, sizeof(buffer));



	if (ret < 0) {

		dev_err(&data->client->dev, "Failed to write PS OFFSET register\n");

		return ret;

	}



	return ret;

}



static int rpr0521_read_raw(struct iio_dev *indio_dev,

			    struct iio_chan_spec const *chan, int *val,

			    int *val2, long mask)
@@ -490,6 +526,15 @@ static int rpr0521_read_raw(struct iio_dev *indio_dev, 


		return IIO_VAL_INT_PLUS_MICRO;



	case IIO_CHAN_INFO_OFFSET:

		mutex_lock(&data->lock);

		ret = rpr0521_read_ps_offset(data, val);

		mutex_unlock(&data->lock);

		if (ret < 0)

			return ret;



		return IIO_VAL_INT;



	default:

		return -EINVAL;

	}
@@ -518,6 +563,13 @@ static int rpr0521_write_raw(struct iio_dev *indio_dev, 


		return ret;



	case IIO_CHAN_INFO_OFFSET:

		mutex_lock(&data->lock);

		ret = rpr0521_write_ps_offset(data, val);

		mutex_unlock(&data->lock);



		return ret;



	default:

		return -EINVAL;

	}

CRA Git | Maintained and supported by SUSTech CRA and CCSE