Commit ae76751f authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Jonathan Cameron
Browse files

iio:ad5755: Report scale as fractional value 



Move the complexity of calculating the fixed point scale to the core.

Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent ecc7e948

drivers/iio/dac/ad5755.c

+5 −12
Original line number Diff line number Diff line
@@ -253,15 +253,6 @@ static inline int ad5755_get_offset(struct ad5755_state *st, 
	return (min * (1 << chan->scan_type.realbits)) / (max - min);

}



static inline int ad5755_get_scale(struct ad5755_state *st,

	struct iio_chan_spec const *chan)

{

	int min, max;



	ad5755_get_min_max(st, chan, &min, &max);

	return ((max - min) * 1000000000ULL) >> chan->scan_type.realbits;

}



static int ad5755_chan_reg_info(struct ad5755_state *st,

	struct iio_chan_spec const *chan, long info, bool write,

	unsigned int *reg, unsigned int *shift, unsigned int *offset)
@@ -303,13 +294,15 @@ static int ad5755_read_raw(struct iio_dev *indio_dev, 
{

	struct ad5755_state *st = iio_priv(indio_dev);

	unsigned int reg, shift, offset;

	int min, max;

	int ret;



	switch (info) {

	case IIO_CHAN_INFO_SCALE:

		*val = 0;

		*val2 = ad5755_get_scale(st, chan);

		return IIO_VAL_INT_PLUS_NANO;

		ad5755_get_min_max(st, chan, &min, &max);

		*val = max - min;

		*val2 = chan->scan_type.realbits;

		return IIO_VAL_FRACTIONAL_LOG2;

	case IIO_CHAN_INFO_OFFSET:

		*val = ad5755_get_offset(st, chan);

		return IIO_VAL_INT;