iio: mma7455: Use scan_type when processing raw data

Use channel definition as root of trust and replace constant
when reading elements directly using the raw sysfs attributes.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Link: https://lore.kernel.org/r/20211104082413.3681212-4-gwendal@chromium.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/accel/mma7455_core.c b/drivers/iio/accel/mma7455_core.c
index 777c6c3..e6739ba 100644 (file)
--- a/drivers/iio/accel/mma7455_core.c
+++ b/drivers/iio/accel/mma7455_core.c
@@ -134,7 +134,8 @@ static int mma7455_read_raw(struct iio_dev *indio_dev,
                if (ret)
                        return ret;
 
-               *val = sign_extend32(le16_to_cpu(data), 9);
+               *val = sign_extend32(le16_to_cpu(data),
+                                    chan->scan_type.realbits - 1);
 
                return IIO_VAL_INT;