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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 <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen 2013-09-28 10:31:00 +01:00 committed by Jonathan Cameron
parent ecc7e948bc
commit ae76751f67
1 changed files with 5 additions and 12 deletions
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17
drivers/iio/dac/ad5755.c
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@ -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;