[PATCH v2 1/2] staging: iio: ad7780: update voltage on read

[Renato Lui Geh]

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it read an outdated value set at initialization.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 <renato...@gmail.com>
---
drivers/staging/iio/adc/ad7780.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index b67412db0318..27972563bb6a 100644
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -87,11 +87,15 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
                           long m)
{
        struct ad7780_state *st = iio_priv(indio_dev);
+       int voltage_uv = 0;

        switch (m) {
        case IIO_CHAN_INFO_RAW:
                return ad_sigma_delta_single_conversion(indio_dev, chan, val);
        case IIO_CHAN_INFO_SCALE:
+               voltage_uv = regulator_get_voltage(st->reg);
+               if (voltage_uv)
+                       st->int_vref_mv = voltage_uv/1000;
                *val = st->int_vref_mv * st->gain;
                *val2 = chan->scan_type.realbits - 1;
                return IIO_VAL_FRACTIONAL_LOG2;
--
2.19.1