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iio:ad5421: 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 4f2c188597
commit bc7c49bc77
1 changed files with 5 additions and 11 deletions
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16
drivers/iio/dac/ad5421.c
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@ -281,18 +281,11 @@ static inline unsigned int ad5421_get_offset(struct ad5421_state *st)
return (min * (1 << 16)) / (max - min);
}
static inline unsigned int ad5421_get_scale(struct ad5421_state *st)
{
unsigned int min, max;
ad5421_get_current_min_max(st, &min, &max);
return ((max - min) * 1000) / (1 << 16);
}
static int ad5421_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val, int *val2, long m)
{
struct ad5421_state *st = iio_priv(indio_dev);
unsigned int min, max;
int ret;
if (chan->type != IIO_CURRENT)
@ -306,9 +299,10 @@ static int ad5421_read_raw(struct iio_dev *indio_dev,
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = ad5421_get_scale(st);
return IIO_VAL_INT_PLUS_MICRO;
ad5421_get_current_min_max(st, &min, &max);
*val = max - min;
*val2 = (1 << 16) * 1000;
return IIO_VAL_FRACTIONAL;
case IIO_CHAN_INFO_OFFSET:
*val = ad5421_get_offset(st);
return IIO_VAL_INT;