On 05/01/17 11:03, Song Hongyan wrote: > Linear acceleration is a soft sensor it differs from a standard > accel sensor, it provides a three-dimensional vector representing > acceleration along each device axis, excluding gravity. > The sensor data is derives from standard accelerometer device > by filtering out the acceleration which is caused by the force > of Earth’s gravity. > > The value can be used to perform gesture detection, it can also > serve as input to an inertial navigation system, which uses > dead reckoning. > > More information can be found in: > http://www.usb.org/developers/hidpage/HUTRR59_-_Usages_for_Wearables.pdf > > Linear accel sensor, gravity sensor and accelerometer have similar > channels and share channel usage ids. So the most of the code for > accel_3d can be reused. > > Signed-off-by: Song Hongyan <hongyan.song@xxxxxxxxx> Applied to the togreg branch of iio.git - initially pushed out as testing sometime soonish. Thanks, Jonathan > --- > changes: unify name not use underline as separator. > > drivers/iio/accel/hid-sensor-accel-3d.c | 42 +++++++++++++++++++++++++++++++++ > include/linux/hid-sensor-ids.h | 3 +++ > 2 files changed, 45 insertions(+) > > diff --git a/drivers/iio/accel/hid-sensor-accel-3d.c b/drivers/iio/accel/hid-sensor-accel-3d.c > index 9edd574..8829dad 100644 > --- a/drivers/iio/accel/hid-sensor-accel-3d.c > +++ b/drivers/iio/accel/hid-sensor-accel-3d.c > @@ -91,6 +91,41 @@ struct accel_3d_state { > }; > > /* Channel definitions */ > +static const struct iio_chan_spec linearaccel_3d_channels[] = { > + { > + .type = IIO_LINEARACCEL, > + .modified = 1, > + .channel2 = IIO_MOD_X, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_SAMP_FREQ) | > + BIT(IIO_CHAN_INFO_HYSTERESIS), > + .scan_index = CHANNEL_SCAN_INDEX_X, > + }, { > + .type = IIO_LINEARACCEL, > + .modified = 1, > + .channel2 = IIO_MOD_Y, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_SAMP_FREQ) | > + BIT(IIO_CHAN_INFO_HYSTERESIS), > + .scan_index = CHANNEL_SCAN_INDEX_Y, > + }, { > + .type = IIO_LINEARACCEL, > + .modified = 1, > + .channel2 = IIO_MOD_Z, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_SAMP_FREQ) | > + BIT(IIO_CHAN_INFO_HYSTERESIS), > + .scan_index = CHANNEL_SCAN_INDEX_Z, > + } > +}; > + > +/* Channel definitions */ > static const struct iio_chan_spec gravity_channels[] = { > { > .type = IIO_GRAVITY, > @@ -354,6 +389,10 @@ static int hid_accel_3d_probe(struct platform_device *pdev) > name = "accel_3d"; > channel_spec = accel_3d_channels; > channel_size = sizeof(accel_3d_channels); > + } else if (hsdev->usage == HID_USAGE_SENSOR_LINEARACCEL_3D) { > + name = "linearaccel_3d"; > + channel_spec = linearaccel_3d_channels; > + channel_size = sizeof(linearaccel_3d_channels); > } else { > name = "gravity"; > channel_spec = gravity_channels; > @@ -452,6 +491,9 @@ static int hid_accel_3d_remove(struct platform_device *pdev) > { /* gravity sensor */ > .name = "HID-SENSOR-20007b", > }, > + { /* linear_accel sensor */ > + .name = "HID-SENSOR-20007c", > + }, > { /* sentinel */ } > }; > MODULE_DEVICE_TABLE(platform, hid_accel_3d_ids); > diff --git a/include/linux/hid-sensor-ids.h b/include/linux/hid-sensor-ids.h > index b6778fd2..bab8375 100644 > --- a/include/linux/hid-sensor-ids.h > +++ b/include/linux/hid-sensor-ids.h > @@ -55,6 +55,9 @@ > /* Gravity vector */ > #define HID_USAGE_SENSOR_GRAVITY_VECTOR 0x20007B > > +/* linear accel */ > +#define HID_USAGE_SENSOR_LINEARACCEL_3D 0x20007C > + > /* ORIENTATION: Compass 3D: (200083) */ > #define HID_USAGE_SENSOR_COMPASS_3D 0x200083 > #define HID_USAGE_SENSOR_DATA_ORIENTATION 0x200470 > -- 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
