iio:ad5360: 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/ad5360.c b/drivers/iio/dac/ad5360.c
index d2da71e..b968af5 100644 (file)
--- a/drivers/iio/dac/ad5360.c
+++ b/drivers/iio/dac/ad5360.c
@@ -379,15 +379,14 @@ static int ad5360_read_raw(struct iio_dev *indio_dev,
                *val = ret >> chan->scan_type.shift;
                return IIO_VAL_INT;
        case IIO_CHAN_INFO_SCALE:
-               /* vout = 4 * vref * dac_code */
-               scale_uv = ad5360_get_channel_vref(st, chan->channel) * 4 * 100;
+               scale_uv = ad5360_get_channel_vref(st, chan->channel);
                if (scale_uv < 0)
                        return scale_uv;
 
-               scale_uv >>= (chan->scan_type.realbits);
-               *val =  scale_uv / 100000;
-               *val2 = (scale_uv % 100000) * 10;
-               return IIO_VAL_INT_PLUS_MICRO;
+               /* vout = 4 * vref * dac_code */
+               *val = scale_uv * 4 / 1000;
+               *val2 = chan->scan_type.realbits;
+               return IIO_VAL_FRACTIONAL_LOG2;
        case IIO_CHAN_INFO_CALIBBIAS:
                ret = ad5360_read(indio_dev, AD5360_READBACK_OFFSET,
                        chan->address);