staging:iio:ad7746: 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/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
index 75a533b..862d68d 100644 (file)
--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -656,20 +656,21 @@ static int ad7746_read_raw(struct iio_dev *indio_dev,
                switch (chan->type) {
                case IIO_CAPACITANCE:
                        /* 8.192pf / 2^24 */
-                       *val2 = 488;
                        *val =  0;
+                       *val2 = 488;
+                       ret = IIO_VAL_INT_PLUS_NANO;
                        break;
                case IIO_VOLTAGE:
                        /* 1170mV / 2^23 */
-                       *val2 = 139475;
-                       *val =  0;
+                       *val = 1170;
+                       *val2 = 23;
+                       ret = IIO_VAL_FRACTIONAL_LOG2;
                        break;
                default:
-                       ret =  -EINVAL;
-                       goto out;
+                       ret = -EINVAL;
+                       break;
                }
 
-               ret = IIO_VAL_INT_PLUS_NANO;
                break;
        default:
                ret = -EINVAL;