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staging:iio:dac:ad5446: Return cached value for 'raw' attribute

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We can not read back the value from the device, but we cache the value anyway so
we might as well return the cached value instead of an error.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lars-Peter Clausen 2012-04-25 09:45:00 +02:00 committed by Greg Kroah-Hartman
parent cae329e04a
commit 5e06bdfb46
1 changed files with 3 additions and 0 deletions
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drivers/staging/iio/dac/ad5446.c
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@ -229,6 +229,9 @@ static int ad5446_read_raw(struct iio_dev *indio_dev,
unsigned long scale_uv;
switch (m) {
case IIO_CHAN_INFO_RAW:
*val = st->cached_val;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
scale_uv = (st->vref_mv * 1000) >> chan->scan_type.realbits;
*val = scale_uv / 1000;