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 712d86b4be09b86ad5b6e224054f9bc69e57659e..7a2cda108a97e84551fe6acc6cd3968072a16a49 100644 (file)
--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -189,9 +189,9 @@ 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) |