iio:max1363: 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/max1363.c b/drivers/iio/adc/max1363.c
index b4bc166d57b0a85b7fdc8ca167d804452d51f30f..2b34d2f02cf33d91473f52460479197e4490963d 100644 (file)
--- a/drivers/iio/adc/max1363.c
+++ b/drivers/iio/adc/max1363.c
@@ -397,7 +397,6 @@ static int max1363_read_raw(struct iio_dev *indio_dev,
 {
        struct max1363_state *st = iio_priv(indio_dev);
        int ret;
-       unsigned long scale_uv;
 
        switch (m) {
        case IIO_CHAN_INFO_RAW:
@@ -406,10 +405,9 @@ static int max1363_read_raw(struct iio_dev *indio_dev,
                        return ret;
                return IIO_VAL_INT;
        case IIO_CHAN_INFO_SCALE:
-               scale_uv = st->vref_uv >> st->chip_info->bits;
-               *val = scale_uv / 1000;
-               *val2 = (scale_uv % 1000) * 1000;
-               return IIO_VAL_INT_PLUS_MICRO;
+               *val = st->vref_uv / 1000;
+               *val2 = st->chip_info->bits;
+               return IIO_VAL_FRACTIONAL_LOG2;
        default:
                return -EINVAL;
        }