iio: core: Introduce IIO_VELOCITY and IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z

Some devices export the current speed value of the user.

One of this devices is Freescale's MMA9553L
(http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf)
that computes the speed of the user based on the number of steps and
stride length.

Introduce a new channel type VELOCITY and a modifier for the magniture or
norm of the velocity vector, IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index c627a9a1cd56..80b5efb1cdbf 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -295,6 +295,7 @@ What:		/sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_tilt_comp_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_pressureY_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_pressure_scale
 What:           /sys/bus/iio/devices/iio:deviceX/in_humidityrelative_scale
+What:           /sys/bus/iio/devices/iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_scale
 KernelVersion:  2.6.35
 Contact:        linux-iio@vger.kernel.org
 Description:
@@ -1164,3 +1165,12 @@ Contact:	linux-iio@vger.kernel.org
 Description:
                 This attribute is used to read the number of steps taken by the user
                 since the last reboot while activated.
+
+What:           /sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_input
+What:           /sys/.../iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_raw
+KernelVersion:  3.19
+Contact:        linux-iio@vger.kernel.org
+Description:
+                This attribute is used to read the current speed value of the
+                user (which is the norm or magnitude of the velocity vector).
+                Units after application of scale are m/s.