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>

diff --git a/drivers/iio/dac/ad5421.c b/drivers/iio/dac/ad5421.c
index 1f78b14abb7dc684e44e159816376181f591e070..567c4bd546e5a5b35195b1a2649736a9bc2e88b7 100644 (file)
--- 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;