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>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/iio/dac/ad5446.c b/drivers/iio/dac/ad5446.c
index 8e28d3633e22..1263b0e5ad84 100644
--- 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;
 }