[PATCH 1/8] staging:iio:dac:ad5446: Do not exit powerdown when writing a sample

[Lars-Peter Clausen <lars@metafoo.de>]

Both the powerdown mode bits and the sample value are stored in the same
register, so writing a sample while the device is powered down will clear the
power down bits. To avoid this only update the cached value when the device is
powered down.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
---
 drivers/staging/iio/dac/ad5446.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/iio/dac/ad5446.c b/drivers/staging/iio/dac/ad5446.c
index ec6968b..0cfe445 100644
--- a/drivers/staging/iio/dac/ad5446.c
+++ b/drivers/staging/iio/dac/ad5446.c
@@ -282,7 +282,8 @@ static int ad5446_write_raw(struct iio_dev *indio_dev,
 		val <<= chan->scan_type.shift;
 		mutex_lock(&indio_dev->mlock);
 		st->cached_val = val;
-		st->chip_info->store_sample(st, val);
+		if (!st->pwr_down)
+			st->chip_info->store_sample(st, val);
 		ret = spi_sync(st->spi, &st->msg);
 		mutex_unlock(&indio_dev->mlock);
 		break;
-- 
1.7.9.5