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>

diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index 8d808b9..d141d45 100644 (file)
--- 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;
 }