From: Stephan Gerhold <stephan@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Reviewed-by: Linus Waleij <linus.walleij@xxxxxxxxxx>
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
}
