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staging:iio:ad7291: Use IIO_VAL_FRACTIONAL_LOG2 

This is a bit more straight forward and also allows better precession when using
the an in-kernel consumer.

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 2013-06-14 16:58:00 +01:00 committed by Jonathan Cameron
parent ab52a9580f
commit 73a4445f30
1 changed files with 3 additions and 5 deletions
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8
drivers/staging/iio/adc/ad7291.c
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@ -456,7 +456,6 @@ static int ad7291_read_raw(struct iio_dev *indio_dev,
{
int ret;
struct ad7291_chip_info *chip = iio_priv(indio_dev);
unsigned int scale_uv;
u16 regval;
s16 signval;
@ -513,10 +512,9 @@ static int ad7291_read_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VOLTAGE:
scale_uv = (chip->int_vref_mv * 1000) >> AD7291_BITS;
*val = scale_uv / 1000;
*val2 = (scale_uv % 1000) * 1000;
return IIO_VAL_INT_PLUS_MICRO;
*val = chip->int_vref_mv;
*val2 = AD7291_BITS;
return IIO_VAL_FRACTIONAL_LOG2;
case IIO_TEMP:
/*
* One LSB of the ADC corresponds to 0.25 deg C.