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

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>

diff --git a/drivers/staging/iio/dac/ad5446.c b/drivers/staging/iio/dac/ad5446.c
index 731cd05456ab8d9ef1cc5685d8ab8730ec696dea..9dc67c806016da7716abc742fb27d70f92924773 100644 (file)
--- a/drivers/staging/iio/dac/ad5446.c
+++ b/drivers/staging/iio/dac/ad5446.c
@@ -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;