iio:ad5446: 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/dac/ad5446.c b/drivers/iio/dac/ad5446.c
index 8e28d36..1263b0e 100644 (file)
--- a/drivers/iio/dac/ad5446.c
+++ b/drivers/iio/dac/ad5446.c
@@ -163,18 +163,15 @@ static int ad5446_read_raw(struct iio_dev *indio_dev,
                           long m)
 {
        struct ad5446_state *st = iio_priv(indio_dev);
-       unsigned long scale_uv;
 
        switch (m) {
        case IIO_CHAN_INFO_RAW:
                *val = st->cached_val;
                return IIO_VAL_INT;
        case IIO_CHAN_INFO_SCALE:
-               scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
-               *val =  scale_uv / 1000;
-               *val2 = (scale_uv % 1000) * 1000;
-               return IIO_VAL_INT_PLUS_MICRO;
-
+               *val = st->vref_mv;
+               *val2 = chan->scan_type.realbits;
+               return IIO_VAL_FRACTIONAL_LOG2;
        }
        return -EINVAL;
 }