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@xxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
