staging: iio: ad7780: update voltage on read

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it read an outdated value set at initialization.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>

diff --git a/drivers/staging/iio/adc/ad7780.c b/drivers/staging/iio/adc/ad7780.c
index ff8e3b2d0efca31c3ba3143db11d5af4b0d3d82d..aa0521a309db2bc933244bdebaa237e46f8b87df 100644 (file)
--- a/drivers/staging/iio/adc/ad7780.c
+++ b/drivers/staging/iio/adc/ad7780.c
@@ -96,12 +96,16 @@ 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: