This is a note to let you know that I've just added the patch titled

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

to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From b500c086e4110829a308c23e83a7cdc65b26228a Mon Sep 17 00:00:00 2001

From: Stephan Gerhold stephan@gerhold.net Date: Fri, 14 Feb 2020 12:03:24 +0100 Subject: iio: magnetometer: ak8974: Fix negative raw values in sysfs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

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 --- drivers/iio/magnetometer/ak8974.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/magnetometer/ak8974.c b/drivers/iio/magnetometer/ak8974.c index fc7e910f8e8b..d32996702110 100644 --- a/drivers/iio/magnetometer/ak8974.c +++ b/drivers/iio/magnetometer/ak8974.c @@ -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; }