Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 018/102] iio: magnetometer: ak8974: Fix negative raw values in sysfs | Date | Wed, 1 Apr 2020 18:17:21 +0200 |
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From: Stephan Gerhold <stephan@gerhold.net>
commit b500c086e4110829a308c23e83a7cdc65b26228a 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: 7c94a8b2ee8c ("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>
--- drivers/iio/magnetometer/ak8974.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iio/magnetometer/ak8974.c +++ b/drivers/iio/magnetometer/ak8974.c @@ -477,7 +477,7 @@ static int ak8974_read_raw(struct iio_de * 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; }
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