[PATCH 5.10 034/599] iio: inkern: apply consumer scale on IIO_VAL_INT cases

From: Greg Kroah-Hartman
Date: Tue Apr 05 2022 - 17:57:48 EST

From: Liam Beguin <liambeguin@xxxxxxxxx>

commit 1bca97ff95c732a516ebb68da72814194980e0a5 upstream.

When a consumer calls iio_read_channel_processed() and the channel has
an integer scale, the scale channel scale is applied and the processed
value is returned as expected.

On the other hand, if the consumer calls iio_convert_raw_to_processed()
the scaling factor requested by the consumer is not applied.

This for example causes the consumer to process mV when expecting uV.
Make sure to always apply the scaling factor requested by the consumer.

Fixes: 48e44ce0f881 ("iio:inkern: Add function to read the processed value")
Signed-off-by: Liam Beguin <liambeguin@xxxxxxxxx>
Reviewed-by: Peter Rosin <peda@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220108205319.2046348-2-liambeguin@xxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/iio/inkern.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -582,7 +582,7 @@ static int iio_convert_raw_to_processed_

switch (scale_type) {
- *processed = raw64 * scale_val;
+ *processed = raw64 * scale_val * scale;
if (scale_val2 < 0)