iio: Added ABI description for quaternion

Added documentation for reading quaternion components for 3D rotations.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 58ba3330030576e582843a263fa16fd34aafba64..6b74691dc2816b110160e27c3fa78f8ca7432c94 100644 (file)
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -792,6 +792,7 @@ What:               /sys/.../iio:deviceX/scan_elements/in_incli_x_en
 What:          /sys/.../iio:deviceX/scan_elements/in_incli_y_en
 What:          /sys/.../iio:deviceX/scan_elements/in_pressureY_en
 What:          /sys/.../iio:deviceX/scan_elements/in_pressure_en
+What:          /sys/.../iio:deviceX/scan_elements/in_rot_quaternion_en
 KernelVersion: 2.6.37
 Contact:       linux-iio@vger.kernel.org
 Description:
@@ -807,6 +808,7 @@ What:               /sys/.../iio:deviceX/scan_elements/in_voltageY_supply_type
 What:          /sys/.../iio:deviceX/scan_elements/in_timestamp_type
 What:          /sys/.../iio:deviceX/scan_elements/in_pressureY_type
 What:          /sys/.../iio:deviceX/scan_elements/in_pressure_type
+What:          /sys/.../iio:deviceX/scan_elements/in_rot_quaternion_type
 KernelVersion: 2.6.37
 Contact:       linux-iio@vger.kernel.org
 Description:
@@ -853,6 +855,7 @@ What:               /sys/.../iio:deviceX/scan_elements/in_incli_y_index
 What:          /sys/.../iio:deviceX/scan_elements/in_timestamp_index
 What:          /sys/.../iio:deviceX/scan_elements/in_pressureY_index
 What:          /sys/.../iio:deviceX/scan_elements/in_pressure_index
+What:          /sys/.../iio:deviceX/scan_elements/in_rot_quaternion_index
 KernelVersion: 2.6.37
 Contact:       linux-iio@vger.kernel.org
 Description:
@@ -899,3 +902,12 @@ Contact:   linux-iio@vger.kernel.org
 Description:
                This attribute is used to get/set the integration time in
                seconds.
+
+What:          /sys/bus/iio/devices/iio:deviceX/in_rot_quaternion_raw
+KernelVersion: 3.15
+Contact:       linux-iio@vger.kernel.org
+Description:
+               Raw value of quaternion components using a format
+               x y z w. Here x, y, and z component represents the axis about
+               which a rotation will occur and w component represents the
+               amount of rotation.