linux-kernel - [PATCH 5.4 52/86] iio: ad5504: Fix setting power-down state

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Message-Id: <20210125183203.247995037@linuxfoundation.org>
Date:   Mon, 25 Jan 2021 19:39:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.4 52/86] iio: ad5504: Fix setting power-down state

From: Lars-Peter Clausen <lars@...afoo.de>

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@...afoo.de>
Acked-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
Link: https://lore.kernel.org/r/20201209104649.5794-1-lars@metafoo.de
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/dac/ad5504.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -188,9 +188,9 @@ static ssize_t ad5504_write_dac_powerdow
 		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) |