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iio: magnetometer: ak8974: Fix negative raw values in sysfs 

commit b500c086e4 upstream.

At the moment, reading from in_magn_*_raw in sysfs tends to return
large values around 65000, even though the output of ak8974 is actually
limited to ±32768. This happens because the value is never converted
to the signed 16-bit integer variant.

Add an explicit cast to s16 to fix this.

Fixes: 7c94a8b2ee ("iio: magn: add a driver for AK8974")
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Reviewed-by: Linus Waleij <linus.walleij@linaro.org>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Stephan Gerhold 2020-02-14 12:03:24 +01:00 committed by Greg Kroah-Hartman
parent 6387b40023
commit a79f53a2f5
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/magnetometer/ak8974.c
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@ -564,7 +564,7 @@ static int ak8974_read_raw(struct iio_dev *indio_dev,
* We read all axes and discard all but one, for optimized
* reading, use the triggered buffer.
*/
*val = le16_to_cpu(hw_values[chan->address]);
*val = (s16)le16_to_cpu(hw_values[chan->address]);
ret = IIO_VAL_INT;
}