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iio:mcp4725: 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>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
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 998f129c76
commit b117f96f49
1 changed files with 3 additions and 5 deletions
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8
drivers/iio/dac/mcp4725.c
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@ -239,17 +239,15 @@ static int mcp4725_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask) int *val, int *val2, long mask)
{ {
struct mcp4725_data *data = iio_priv(indio_dev); struct mcp4725_data *data = iio_priv(indio_dev);
unsigned long scale_uv;
switch (mask) { switch (mask) {
case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_RAW:
*val = data->dac_value; *val = data->dac_value;
return IIO_VAL_INT; return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE: case IIO_CHAN_INFO_SCALE:
scale_uv = (data->vref_mv * 1000) >> 12; *val = data->vref_mv;
*val = scale_uv / 1000000; *val2 = 12;
*val2 = scale_uv % 1000000; return IIO_VAL_FRACTIONAL_LOG2;
return IIO_VAL_INT_PLUS_MICRO;
} }
return -EINVAL; return -EINVAL;
} }