iio:max517: 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/max517.c b/drivers/iio/dac/max517.c
index 83adcbf..d26be14 100644 (file)
--- a/drivers/iio/dac/max517.c
+++ b/drivers/iio/dac/max517.c
@@ -82,15 +82,13 @@ static int max517_read_raw(struct iio_dev *indio_dev,
                           long m)
 {
        struct max517_data *data = iio_priv(indio_dev);
-       unsigned int scale_uv;
 
        switch (m) {
        case IIO_CHAN_INFO_SCALE:
                /* Corresponds to Vref / 2^(bits) */
-               scale_uv = (data->vref_mv[chan->channel] * 1000) >> 8;
-               *val =  scale_uv / 1000000;
-               *val2 = scale_uv % 1000000;
-               return IIO_VAL_INT_PLUS_MICRO;
+               *val = data->vref_mv[chan->channel];
+               *val2 = 8;
+               return IIO_VAL_FRACTIONAL_LOG2;
        default:
                break;
        }