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staging:iio:ad7780: Report scale as fractional value

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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 9324131b5a
commit c0d014122d
1 changed files with 3 additions and 6 deletions
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9
drivers/staging/iio/adc/ad7780.c
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@ -90,17 +90,14 @@ static int ad7780_read_raw(struct iio_dev *indio_dev,
long m) long m)
{ {
struct ad7780_state *st = iio_priv(indio_dev); struct ad7780_state *st = iio_priv(indio_dev);
unsigned long scale_uv;
switch (m) { switch (m) {
case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_RAW:
return ad_sigma_delta_single_conversion(indio_dev, chan, val); return ad_sigma_delta_single_conversion(indio_dev, chan, val);
case IIO_CHAN_INFO_SCALE: case IIO_CHAN_INFO_SCALE:
scale_uv = (st->int_vref_mv * 100000 * st->gain) *val = st->int_vref_mv * st->gain;
>> (chan->scan_type.realbits - 1); *val2 = chan->scan_type.realbits - 1;
*val = scale_uv / 100000; return IIO_VAL_FRACTIONAL_LOG2;
*val2 = (scale_uv % 100000) * 10;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OFFSET: case IIO_CHAN_INFO_OFFSET:
*val -= (1 << (chan->scan_type.realbits - 1)); *val -= (1 << (chan->scan_type.realbits - 1));
return IIO_VAL_INT; return IIO_VAL_INT;