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iio: adc: mcp3911: make use of the sign bit

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[ Upstream commit 8f89e33bf040bbef66386c426198622180233178 ]

The device supports negative values as well.

Fixes: 3a89b289df ("iio: adc: add support for mcp3911")
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20220722130726.7627-2-marcus.folkesson@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marcus Folkesson 2022-07-22 15:07:18 +02:00 • committed by Greg Kroah-Hartman
commit ddc6e82321
1 changed files with 2 additions and 0 deletions
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drivers/iio/adc/mcp3911.c
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@ -111,6 +111,8 @@ static int mcp3911_read_raw(struct iio_dev *indio_dev,
if (ret)
goto out;
*val = sign_extend32(*val, 23);
ret = IIO_VAL_INT;
break;