Add new channel types support for linear accel sensor. Linear acceleration differs from a standard accelerometor, its value depends on standard accel sensor and gravity sensor. Conceptually, this three sensors have following relationship: linear acceleration = acceleration - acceleration due to gravity At rest, standard accelerometer displays 1g due to earth’s gravitational pull while a liner accelerometer will show 0g. More information can be found in: http://www.usb.org/developers/hidpage/HUTRR59_-_Usages_for_Wearables.pdf Signed-off-by: Song Hongyan <hongyan.song@xxxxxxxxx> --- changes: unify the name not use underline as separator. Documentation/ABI/testing/sysfs-bus-iio | 13 +++++++++++++ drivers/iio/industrialio-core.c | 1 + include/uapi/linux/iio/types.h | 1 + tools/iio/iio_event_monitor.c | 2 ++ 4 files changed, 17 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index ed5bc2b..0204473 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -170,6 +170,19 @@ Description: Has all of the equivalent parameters as per voltageY. Units after application of scale and offset are m/s^2. +What: /sys/bus/iio/devices/iio:deviceX/in_linearaccel_x_raw +What: /sys/bus/iio/devices/iio:deviceX/in_linearaccel_y_raw +What: /sys/bus/iio/devices/iio:deviceX/in_linearaccel_z_raw +KernelVersion: 4.11 +Contact: linux-iio@xxxxxxxxxxxxxxx +Description: + Linear Acceleration in direction x, y or z (may be arbitrarily + assigned but should match other such assignments on device). + The sensor data is derives from standard accelerometer device + by filtering out the acceleration which is caused by the force + of Earth’s gravity.Units after application of scale and offset + are m/s^2. + What: /sys/bus/iio/devices/iio:deviceX/in_gravity_x_raw What: /sys/bus/iio/devices/iio:deviceX/in_gravity_y_raw What: /sys/bus/iio/devices/iio:deviceX/in_gravity_z_raw diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index c601698..a1fc446 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -84,6 +84,7 @@ struct bus_type iio_bus_type = { [IIO_COUNT] = "count", [IIO_INDEX] = "index", [IIO_GRAVITY] = "gravity", + [IIO_LINEARACCEL] = "linearaccel", }; static const char * const iio_modifier_names[] = { diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h index ffafd6c..41d8465 100644 --- a/include/uapi/linux/iio/types.h +++ b/include/uapi/linux/iio/types.h @@ -43,6 +43,7 @@ enum iio_chan_type { IIO_COUNT, IIO_INDEX, IIO_GRAVITY, + IIO_LINEARACCEL, }; enum iio_modifier { diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c index b61245e..a8e7896 100644 --- a/tools/iio/iio_event_monitor.c +++ b/tools/iio/iio_event_monitor.c @@ -58,6 +58,7 @@ [IIO_PH] = "ph", [IIO_UVINDEX] = "uvindex", [IIO_GRAVITY] = "gravity", + [IIO_LINEARACCEL] = "linearaccel", }; static const char * const iio_ev_type_text[] = { @@ -151,6 +152,7 @@ static bool event_is_known(struct iio_event_data *event) case IIO_PH: case IIO_UVINDEX: case IIO_GRAVITY: + case IIO_LINEARACCEL: break; default: return false; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
