iio:ad5421: 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, 5 insertions, 11 deletions

diff --git a/drivers/iio/dac/ad5421.c b/drivers/iio/dac/ad5421.c
index 1f78b14abb7d..567c4bd546e5 100644
--- a/drivers/iio/dac/ad5421.c
+++ b/drivers/iio/dac/ad5421.c
@@ -281,18 +281,11 @@ static inline unsigned int ad5421_get_offset(struct ad5421_state *st)
         return (min * (1 << 16)) / (max - min);
 }
 
-static inline unsigned int ad5421_get_scale(struct ad5421_state *st)
-{
-        unsigned int min, max;
-
-        ad5421_get_current_min_max(st, &min, &max);
-        return ((max - min) * 1000) / (1 << 16);
-}
-
 static int ad5421_read_raw(struct iio_dev *indio_dev,
         struct iio_chan_spec const *chan, int *val, int *val2, long m)
 {
         struct ad5421_state *st = iio_priv(indio_dev);
+        unsigned int min, max;
         int ret;
 
         if (chan->type != IIO_CURRENT)
@@ -306,9 +299,10 @@ static int ad5421_read_raw(struct iio_dev *indio_dev,
                 *val = ret;
                 return IIO_VAL_INT;
         case IIO_CHAN_INFO_SCALE:
-                *val = 0;
-                *val2 = ad5421_get_scale(st);
-                return IIO_VAL_INT_PLUS_MICRO;
+                ad5421_get_current_min_max(st, &min, &max);
+                *val = max - min;
+                *val2 = (1 << 16) * 1000;
+                return IIO_VAL_FRACTIONAL;
         case IIO_CHAN_INFO_OFFSET:
                 *val = ad5421_get_offset(st);
                 return IIO_VAL_INT;