iio: ad5504: Fix setting power-down state

commit efd597b2839a9895e8a98fcb0b76d2f545802cd4 upstream.

The power-down mask of the ad5504 is actually a power-up mask. Meaning if
a bit is set the corresponding channel is powered up and if it is not set
the channel is powered down.

The driver currently has this the wrong way around, resulting in the
channel being powered up when requested to be powered down and vice versa.

Fixes: 3bbbf150ffde ("staging:iio:dac:ad5504: Use strtobool for boolean values")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20201209104649.5794-1-lars@metafoo.de
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/dac/ad5504.c b/drivers/iio/dac/ad5504.c
index c64e6898ff20ab043b7437921c9f959ce34d0ffb..d1ffc8cb08ed600816d047eee080d8c17bd8cf3c 100644 (file)
--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -188,9 +188,9 @@ static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
                return ret;
 
        if (pwr_down)
-               st->pwr_down_mask |= (1 << chan->channel);
-       else
                st->pwr_down_mask &= ~(1 << chan->channel);
+       else
+               st->pwr_down_mask |= (1 << chan->channel);
 
        ret = ad5504_spi_write(st, AD5504_ADDR_CTRL,
                                AD5504_DAC_PWRDWN_MODE(st->pwr_down_mode) |