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iio: light: apds9960: Add proximity and gesture offset calibration

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Proximity and gesture offset registers perform offset correction to
improve cross-talk performance. Added `calibbias` to the proximity
and gesture channels.
Provided facility to set calibbias based on the channel number.

Signed-off-by: Abhash Jha <abhashkumarjha123@gmail.com>
Link: https://patch.msgid.link/20240804134212.51682-2-abhashkumarjha123@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Abhash Jha 2024-08-04 19:12:12 +05:30 committed by Jonathan Cameron
parent 6fc839dc32
commit 06e91ad344
1 changed files with 54 additions and 1 deletions
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55
drivers/iio/light/apds9960.c
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@ -146,6 +146,25 @@ struct apds9960_data {
/* gesture buffer */
u8 buffer[4]; /* 4 8-bit channels */
/* calibration value buffer */
int calibbias[5];
};
enum {
APDS9960_CHAN_PROXIMITY,
APDS9960_CHAN_GESTURE_UP,
APDS9960_CHAN_GESTURE_DOWN,
APDS9960_CHAN_GESTURE_LEFT,
APDS9960_CHAN_GESTURE_RIGHT,
};
static const unsigned int apds9960_offset_regs[][2] = {
[APDS9960_CHAN_PROXIMITY] = {APDS9960_REG_POFFSET_UR, APDS9960_REG_POFFSET_DL},
[APDS9960_CHAN_GESTURE_UP] = {APDS9960_REG_GOFFSET_U, 0},
[APDS9960_CHAN_GESTURE_DOWN] = {APDS9960_REG_GOFFSET_D, 0},
[APDS9960_CHAN_GESTURE_LEFT] = {APDS9960_REG_GOFFSET_L, 0},
[APDS9960_CHAN_GESTURE_RIGHT] = {APDS9960_REG_GOFFSET_R, 0},
};
static const struct reg_default apds9960_reg_defaults[] = {
@ -255,6 +274,7 @@ static const struct iio_event_spec apds9960_als_event_spec[] = {
#define APDS9960_GESTURE_CHANNEL(_dir, _si) { \
.type = IIO_PROXIMITY, \
.info_mask_separate = BIT(IIO_CHAN_INFO_CALIBBIAS), \
.channel = _si + 1, \
.scan_index = _si, \
.indexed = 1, \
@ -282,7 +302,8 @@ static const struct iio_chan_spec apds9960_channels[] = {
{
.type = IIO_PROXIMITY,
.address = APDS9960_REG_PDATA,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_CALIBBIAS),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
.channel = 0,
.indexed = 0,
@ -316,6 +337,28 @@ static const struct iio_chan_spec apds9960_channels[] = {
APDS9960_INTENSITY_CHANNEL(BLUE),
};
static int apds9960_set_calibbias(struct apds9960_data *data,
struct iio_chan_spec const *chan, int calibbias)
{
int ret, i;
if (calibbias < S8_MIN || calibbias > S8_MAX)
return -EINVAL;
guard(mutex)(&data->lock);
for (i = 0; i < 2; i++) {
if (apds9960_offset_regs[chan->channel][i] == 0)
break;
ret = regmap_write(data->regmap, apds9960_offset_regs[chan->channel][i], calibbias);
if (ret < 0)
return ret;
}
data->calibbias[chan->channel] = calibbias;
return 0;
}
/* integration time in us */
static const int apds9960_int_time[][2] = {
{ 28000, 246},
@ -531,6 +574,12 @@ static int apds9960_read_raw(struct iio_dev *indio_dev,
}
mutex_unlock(&data->lock);
break;
case IIO_CHAN_INFO_CALIBBIAS:
mutex_lock(&data->lock);
*val = data->calibbias[chan->channel];
ret = IIO_VAL_INT;
mutex_unlock(&data->lock);
break;
}
return ret;
@ -564,6 +613,10 @@ static int apds9960_write_raw(struct iio_dev *indio_dev,
default:
return -EINVAL;
}
case IIO_CHAN_INFO_CALIBBIAS:
if (val2 != 0)
return -EINVAL;
return apds9960_set_calibbias(data, chan, val);
default:
return -EINVAL;
}