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iio: adc: ad7923: fix channel readings for some variants 

commit f4f43f01cf upstream.

Some of the supported devices have 4 or 2 LSB trailing bits that should
not be taken into account. Hence we need to shift these bits out which
fits perfectly on the scan type shift property. This change fixes both
raw and buffered reads.

Fixes: f2f7a44970 ("iio:adc:ad7923: Add support for the ad7904/ad7914/ad7924")
Fixes: 851644a60d ("iio: adc: ad7923: Add support for the ad7908/ad7918/ad7928")
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220912081223.173584-2-nuno.sa@analog.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nuno Sá 2022-09-12 10:12:21 +02:00 committed by Greg Kroah-Hartman
parent 14fd9ed9bc
commit fe2852bc80
1 changed files with 3 additions and 1 deletions
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4
drivers/iio/adc/ad7923.c
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@ -93,6 +93,7 @@ enum ad7923_id {
.sign = 'u', \
.realbits = (bits), \
.storagebits = 16, \
.shift = 12 - (bits), \
.endianness = IIO_BE, \
}, \
}
@ -268,7 +269,8 @@ static int ad7923_read_raw(struct iio_dev *indio_dev,
return ret;
if (chan->address == EXTRACT(ret, 12, 4))
*val = EXTRACT(ret, 0, 12);
*val = EXTRACT(ret, chan->scan_type.shift,
chan->scan_type.realbits);
else
return -EIO;