[PATCH v3 0/4] Add WoM feature as an IIO event

[inv.git-commit@tdk.com]

From: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@tdk.com>

Add WoM (Wake-on-Motion) feature for all chips supporting it (all except
MPU-6000/6050/9150). WoM compares the magnitude of the current accel sample
with the previous one against a threshold and returns an interrupt event if
the value is higher.

WoM is checking against all axes and maps best to ROC since it compares the
last 2 samples. Thus report WoM as an accel x|y|z roc_rising IIO event, add
system wakeup functionality if WoM is on and put the chip in low-power mode
when the system is suspended. Corresponding ROC value is in SI units since
the chip is using an absolute value in mg.

v2:
- Rework to use accel x|y|z roc for reporting WoM event
- Use only datasheet advertised bits for MPU-6500 family chips

v3
- Coding style fixes
- Convert mutex usage to guard/scoped_guard

Jean-Baptiste Maneyrol (4):
  iio: imu: inv_mpu6050: add WoM (Wake-on-Motion) sensor
  iio: imu: inv_mpu6050: add WoM event as accel event
  iio: imu: inv_mpu6050: add new interrupt handler for WoM events
  iio: imu: inv_mpu6050: add WoM suspend wakeup with low-power mode

 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c    | 542 ++++++++++++++++--
 drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h     |  36 +-
 drivers/iio/imu/inv_mpu6050/inv_mpu_ring.c    |  17 +-
 drivers/iio/imu/inv_mpu6050/inv_mpu_trigger.c |  83 ++-
 4 files changed, 595 insertions(+), 83 deletions(-)

-- 
2.34.1