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staging: iio: ad7780: update voltage on read

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[ Upstream commit 336650c785b62c3bea7c8cf6061c933a90241f67 ]

The ad7780 driver previously did not read the correct device output, as
it read an outdated value set at initialization. It now updates its
voltage on read.

Signed-off-by: Renato Lui Geh <renatogeh@gmail.com>
Acked-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Renato Lui Geh 2018-11-05 17:14:58 -02:00 committed by Greg Kroah-Hartman
parent 8a9cf43e72
commit d755ae852b
1 changed files with 5 additions and 1 deletions
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6
drivers/staging/iio/adc/ad7780.c
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@ -87,12 +87,16 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
long m)
{
struct ad7780_state *st = iio_priv(indio_dev);
int voltage_uv;
switch (m) {
case IIO_CHAN_INFO_RAW:
return ad_sigma_delta_single_conversion(indio_dev, chan, val);
case IIO_CHAN_INFO_SCALE:
*val = st->int_vref_mv * st->gain;
voltage_uv = regulator_get_voltage(st->reg);
if (voltage_uv < 0)
return voltage_uv;
*val = (voltage_uv / 1000) * st->gain;
*val2 = chan->scan_type.realbits - 1;
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_OFFSET: