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iio: potentiometer: tpl0102: add IIO_AVAIL_RANGE support 

Report the step range of the respective potentiometers that are
possible to userspace.

Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
hifive-unleashed-5.1
Matt Ranostay 2018-10-28 13:43:54 -07:00 committed by Jonathan Cameron
parent fdbd710b35
commit 74cf7b8614
1 changed files with 27 additions and 7 deletions
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34
drivers/iio/potentiometer/tpl0102.c
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@ -15,7 +15,7 @@
struct tpl0102_cfg {
int wipers;
int max_pos;
int avail[3];
int kohms;
};
@ -28,11 +28,11 @@ enum tpl0102_type {
static const struct tpl0102_cfg tpl0102_cfg[] = {
/* on-semiconductor parts */
[CAT5140_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
[CAT5140_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
[CAT5140_503] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 50, },
[CAT5140_104] = { .wipers = 1, .avail = { 0, 1, 255 }, .kohms = 100, },
/* ti parts */
[TPL0102_104] = { .wipers = 2, .max_pos = 256, .kohms = 100 },
[TPL0401_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
[TPL0102_104] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 100 },
[TPL0401_103] = { .wipers = 1, .avail = { 0, 1, 127 }, .kohms = 10, },
};
struct tpl0102_data {
@ -52,6 +52,7 @@ static const struct regmap_config tpl0102_regmap_config = {
.channel = (ch), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW), \
}
static const struct iio_chan_spec tpl0102_channels[] = {
@ -73,13 +74,31 @@ static int tpl0102_read_raw(struct iio_dev *indio_dev,
}
case IIO_CHAN_INFO_SCALE:
*val = 1000 * data->cfg->kohms;
*val2 = data->cfg->max_pos;
*val2 = data->cfg->avail[2] + 1;
return IIO_VAL_FRACTIONAL;
}
return -EINVAL;
}
static int tpl0102_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long mask)
{
struct tpl0102_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
*length = ARRAY_SIZE(data->cfg->avail);
*vals = data->cfg->avail;
*type = IIO_VAL_INT;
return IIO_AVAIL_RANGE;
}
return -EINVAL;
}
static int tpl0102_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
@ -89,7 +108,7 @@ static int tpl0102_write_raw(struct iio_dev *indio_dev,
if (mask != IIO_CHAN_INFO_RAW)
return -EINVAL;
if (val >= data->cfg->max_pos || val < 0)
if (val > data->cfg->avail[2] || val < 0)
return -EINVAL;
return regmap_write(data->regmap, chan->channel, val);
@ -97,6 +116,7 @@ static int tpl0102_write_raw(struct iio_dev *indio_dev,
static const struct iio_info tpl0102_info = {
.read_raw = tpl0102_read_raw,
.read_avail = tpl0102_read_avail,
.write_raw = tpl0102_write_raw,
};