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authorLars-Peter Clausen <lars@metafoo.de>2013-09-28 10:31:00 +0100
committerJonathan Cameron <jic23@kernel.org>2013-10-01 16:19:10 +0100
commitae76751f67110f497848afd71d06a0b6bb4a7c89 (patch)
treeab3a7fb974ab00125f2db151bf7c64d60626f971 /drivers/iio/dac
parentecc7e948bca09b97b6b1d0f4b4516bee34e8ce6b (diff)
downloadblackbird-op-linux-ae76751f67110f497848afd71d06a0b6bb4a7c89.tar.gz
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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>
Diffstat (limited to 'drivers/iio/dac')
-rw-r--r--drivers/iio/dac/ad5755.c17
1 files changed, 5 insertions, 12 deletions
diff --git a/drivers/iio/dac/ad5755.c b/drivers/iio/dac/ad5755.c
index f305a0c83418..bd31dbc340c1 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;
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