iio: hid-sensors: Convert units and exponent
HID sensor hub specify a default unit and alternative units. This
along with unit exponent can be used adjust scale. This change
change HID sensor data units to IIO defined units for each
sensor type. So in this way user space can use a simply use:
"(data + offset) * scale" to get final result.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index b70cfd7..89626b2 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h
@@ -223,4 +223,8 @@
int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
u32 report_id, int field_index, u32 usage_id);
+int hid_sensor_format_scale(u32 usage_id,
+ struct hid_sensor_hub_attribute_info *attr_info,
+ int *val0, int *val1);
+
#endif
