iio:ad7476: Report scale as fractional value

Move the complexity of calculating the fixed point scale to the core.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index 8d808b9de909..d141d452c3d1 100644
--- a/drivers/iio/adc/ad7476.c
+++ b/drivers/iio/adc/ad7476.c
@@ -127,10 +127,9 @@ static int ad7476_read_raw(struct iio_dev *indio_dev,
                 } else {
                         scale_uv = st->chip_info->int_vref_uv;
                 }
-                scale_uv >>= chan->scan_type.realbits;
-                *val =  scale_uv / 1000;
-                *val2 = (scale_uv % 1000) * 1000;
-                return IIO_VAL_INT_PLUS_MICRO;
+                *val = scale_uv / 1000;
+                *val2 = chan->scan_type.realbits;
+                return IIO_VAL_FRACTIONAL_LOG2;
         }
         return -EINVAL;
 }