Previously, the driver always used the amount of precision bits of
differential input channels to provide the scale to mV. Though,
differential and common-mode voltage channels have different amount of
precision bits and the correct number of precision bits must be considered
to get to a proper mV scale factor for each one. Use channel specific
number of precision bits to provide the correct scale value for each
channel.

Fixes: de67f28abe58 ("iio: adc: ad4030: check scan_type for error")
Fixes: 949abd1ca5a4 ("iio: adc: ad4030: add averaging support")
Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
---
 drivers/iio/adc/ad4030.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad4030.c b/drivers/iio/adc/ad4030.c
index 1bc2f9a22470..d8bee6a4215a 100644
--- a/drivers/iio/adc/ad4030.c
+++ b/drivers/iio/adc/ad4030.c
@@ -385,7 +385,7 @@ static int ad4030_get_chan_scale(struct iio_dev *indio_dev,
 	struct ad4030_state *st = iio_priv(indio_dev);
 	const struct iio_scan_type *scan_type;
 
-	scan_type = iio_get_current_scan_type(indio_dev, st->chip->channels);
+	scan_type = iio_get_current_scan_type(indio_dev, chan);
 	if (IS_ERR(scan_type))
 		return PTR_ERR(scan_type);
 
-- 
2.50.1

On 9/18/25 12:37 PM, Marcelo Schmitt wrote:
> Previously, the driver always used the amount of precision bits of
> differential input channels to provide the scale to mV. Though,
> differential and common-mode voltage channels have different amount of
> precision bits and the correct number of precision bits must be considered
> to get to a proper mV scale factor for each one. Use channel specific
> number of precision bits to provide the correct scale value for each
> channel.
> 
> Fixes: de67f28abe58 ("iio: adc: ad4030: check scan_type for error")
> Fixes: 949abd1ca5a4 ("iio: adc: ad4030: add averaging support")
> Signed-off-by: Marcelo Schmitt <marcelo.schmitt@analog.com>
> ---
Reviewed-by: David Lechner <dlechner@baylibre.com>