[PATCH v2 0/2] Input: drv260x: restore configuration across power loss

[Maurizio Casciano <mauriziocasciano7@gmail.com>]

The DRV260x enable GPIO disables the I2C interface and resets volatile
configuration when lowered. Closing the input device or suspending the
system can therefore leave the controller unconfigured when it is used
again.

Restore the actuator configuration when the input device is reopened and
after system resume. Quiesce asynchronous force-feedback work during
suspend, restore a usable state if regulator shutdown fails, and keep the
firmware-selected actuator mode unchanged during playback.

Changes since v1:

- add a separate first patch restoring configuration after input close;
- stop overwriting the configured actuator mode during playback; and
- retain the suspend/resume sequencing fix while restoring all volatile
  configuration after the enable GPIO is asserted.

The previously posted optional-vbat change is withdrawn, as requested by
Dmitry. The Yoga Book enable-GPIO mapping has also been removed from the
generic Input driver and is provided by board software nodes in the
separately posted platform/x86 v2 series.

Both patches pass strict checkpatch, W=1 and sparse v0.6.5-rc1. They were
tested on a Lenovo Yoga Book YB1-X91L with both DRV2604 devices. An
RTC-timed suspend-to-RAM and resume completed without rebooting, and both
force-feedback devices played effects afterwards without drv260x, I2C or
configuration-restore errors.

With Best Regards,
Maurizio Casciano

Maurizio Casciano (2):
  Input: drv260x: Restore configuration after device close
  Input: drv260x: Fix suspend and resume sequencing

 drivers/input/misc/drv260x.c | 58 +++++++++++++++++++++++++++++-------
 1 file changed, 48 insertions(+), 10 deletions(-)


base-commit: 9a29ee801f525bcad71fea021bfe2a030885c8df
-- 
2.53.0