iio:ad7266: 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>
diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
index 656aa3e..f5723cb 100644
--- a/drivers/iio/adc/ad7266.c
+++ b/drivers/iio/adc/ad7266.c
@@ -27,7 +27,7 @@
struct ad7266_state {
struct spi_device *spi;
struct regulator *reg;
- unsigned long vref_uv;
+ unsigned long vref_mv;
struct spi_transfer single_xfer[3];
struct spi_message single_msg;
@@ -156,7 +156,7 @@
struct iio_chan_spec const *chan, int *val, int *val2, long m)
{
struct ad7266_state *st = iio_priv(indio_dev);
- unsigned long scale_uv;
+ unsigned long scale_mv;
int ret;
switch (m) {
@@ -174,16 +174,15 @@
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- scale_uv = (st->vref_uv * 100);
+ scale_mv = st->vref_mv;
if (st->mode == AD7266_MODE_DIFF)
- scale_uv *= 2;
+ scale_mv *= 2;
if (st->range == AD7266_RANGE_2VREF)
- scale_uv *= 2;
+ scale_mv *= 2;
- scale_uv >>= chan->scan_type.realbits;
- *val = scale_uv / 100000;
- *val2 = (scale_uv % 100000) * 10;
- return IIO_VAL_INT_PLUS_MICRO;
+ *val = scale_mv;
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_OFFSET:
if (st->range == AD7266_RANGE_2VREF &&
st->mode != AD7266_MODE_DIFF)
@@ -414,10 +413,10 @@
if (ret < 0)
goto error_disable_reg;
- st->vref_uv = ret;
+ st->vref_mv = ret / 1000;
} else {
/* Use internal reference */
- st->vref_uv = 2500000;
+ st->vref_mv = 2500;
}
if (pdata) {