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> --- Documentation/ABI/testing/sysfs-bus-iio | 10 ++++++++++ drivers/iio/industrialio-core.c | 1 + include/uapi/linux/iio/types.h | 1 + tools/iio/iio_event_monitor.c | 2 ++ 4 files changed, 14 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 60b7406..8091f3d 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -170,6 +170,16 @@ 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_linear_accel_x_raw +What: /sys/bus/iio/devices/iio:deviceX/in_linear_accel_y_raw +What: /sys/bus/iio/devices/iio:deviceX/in_linear_accel_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). + 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_gravity_x_raw What: /sys/bus/iio/devices/iio:deviceX/in_gravity_y_raw diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 72fc96a..da78c26 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -82,6 +82,7 @@ struct bus_type iio_bus_type = { [IIO_UVINDEX] = "uvindex", [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", [IIO_GRAVITY] = "gravity", + [IIO_LINEAR_ACCEL] = "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 d3f7ba7..d6df101 100644 --- a/include/uapi/linux/iio/types.h +++ b/include/uapi/linux/iio/types.h @@ -41,6 +41,7 @@ enum iio_chan_type { IIO_UVINDEX, IIO_ELECTRICALCONDUCTIVITY, IIO_GRAVITY, + IIO_LINEAR_ACCEL, }; enum iio_modifier { diff --git a/tools/iio/iio_event_monitor.c b/tools/iio/iio_event_monitor.c index b61245e..116644a 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_LINEAR_ACCEL] = "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_LINEAR_ACCEL: break; default: return false; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
