linux-kernel - [PATCH 4.20 44/65] iio: dac: ad5686: fix bit shift read register

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Date:   Fri, 11 Jan 2019 15:15:30 +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,
        Mircea Caprioru <mircea.caprioru@...log.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 4.20 44/65] iio: dac: ad5686: fix bit shift read register

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mircea Caprioru <mircea.caprioru@...log.com>

commit 0e76df5c978338f3051e5126fc0c4245c57a307a upstream.

This patch solves the register readback issue with the bit shift. When the
dac resolution was lower than the register size (ex. 12 bits out of 16
bits) the readback value was not shifted with the difference in bits and
the value was higher. Also a mask is applied on the read value in order to
get the value relative to the actual bit size.

Fixes: 0357e488b8 ("iio:dac:ad5686: Refactor the driver")
Signed-off-by: Mircea Caprioru <mircea.caprioru@...log.com>
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/ad5686.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/iio/dac/ad5686.c
+++ b/drivers/iio/dac/ad5686.c
@@ -124,7 +124,8 @@ static int ad5686_read_raw(struct iio_de
 		mutex_unlock(&indio_dev->mlock);
 		if (ret < 0)
 			return ret;
-		*val = ret;
+		*val = (ret >> chan->scan_type.shift) &
+			GENMASK(chan->scan_type.realbits - 1, 0);
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		*val = st->vref_mv;