On Mon, 2018-11-05 at 17:14 -0200, Renato Lui Geh wrote:
> 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 it read an outdated value set at initialization.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.
>
Looks good from my side.
Alex
> Signed-off-by: Renato Lui Geh <renatogeh@xxxxxxxxx>
> ---
> Changes in v3:
> - removed initialization (int voltage_uv = 0)
> - returns error when voltage_uv is null
> Changes in v4:
> - returns error when voltage_uv is negative
>
> drivers/staging/iio/adc/ad7780.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/iio/adc/ad7780.c
> b/drivers/staging/iio/adc/ad7780.c
> index b67412db0318..c7cb05cedbbc 100644
> --- a/drivers/staging/iio/adc/ad7780.c
> +++ b/drivers/staging/iio/adc/ad7780.c
> @@ -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:
