From ae76751f67110f497848afd71d06a0b6bb4a7c89 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Sat, 28 Sep 2013 10:31:00 +0100 Subject: [PATCH] iio:ad5755: Report scale as fractional value Move the complexity of calculating the fixed point scale to the core. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- drivers/iio/dac/ad5755.c | 17 +++++------------ 1 file changed, 5 insertions(+), 12 deletions(-) diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c index f305a0c..bd31dbc 100644 --- a/drivers/iio/dac/ad5755.c +++ b/drivers/iio/dac/ad5755.c @@ -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; -- 2.7.4