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>

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index c627a9a..80b5efb 100644 (file)
--- 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.

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 655755b..18a8ab9 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -74,6 +74,7 @@ static const char * const iio_chan_type_name_spec[] = {
        [IIO_STEPS] = "steps",
        [IIO_ENERGY] = "energy",
        [IIO_DISTANCE] = "distance",
+       [IIO_VELOCITY] = "velocity",
 };
 
 static const char * const iio_modifier_names[] = {
@@ -99,6 +100,7 @@ static const char * const iio_modifier_names[] = {
        [IIO_MOD_JOGGING] = "jogging",
        [IIO_MOD_WALKING] = "walking",
        [IIO_MOD_STILL] = "still",
+       [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)",
 };
 
 /* relies on pairs of these shared then separate */

diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
index a7de445..c3601c2 100644 (file)
--- a/include/linux/iio/types.h
+++ b/include/linux/iio/types.h
@@ -34,6 +34,7 @@ enum iio_chan_type {
        IIO_STEPS,
        IIO_ENERGY,
        IIO_DISTANCE,
+       IIO_VELOCITY,
 };
 
 enum iio_modifier {
@@ -68,6 +69,7 @@ enum iio_modifier {
        IIO_MOD_JOGGING,
        IIO_MOD_WALKING,
        IIO_MOD_STILL,
+       IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z,
 };
 
 enum iio_event_type {