[PATCH 00/15] HID: hid-oxp: fix and extend X2-family controller support

[Andrei Aldea <andrei1998@gmail.com>]

This 15-patch series fixes existing hid-oxp configuration and RGB issues
and adds controller and lighting support for ONEXPLAYER X2-family devices,
including the ONEXPLAYER 3 and X2 Mini Pro.

The fixes correct the M1/M2 defaults, validate input reports and RGB state,
correct brightness and color scaling, serialize RGB updates, and make
configuration state and delayed-work lifetime local to each HID interface.
They also handle controller reinitialization across system suspend.

The X2 support selects configuration interface 2, supplies the required
three-page button map, and adds the Gen3 protocol for joystick-ring zones
1, 2 and 7. The Guide button and rear logo receive independent multicolor
LED devices using zones 5 and 6, with monocolor and breathing effects.
The final patch documents the controller and lighting sysfs ABI.

Patches 1-10 contain behavioral fixes. Patch 11 groups existing declarations.
Patch 12 adds X2 button maps and interface selection; patch 13 provides the
shared LED representation; patches 14-15 add X2 lighting support.

This series is based on mainline commit
50d05c7c76c96b90462f24debacca971d2e86713.

Testing:

I tested this series on an ONEXPLAYER 3 running Bazzite 44 with kernel
7.2.0-ogc6.1.fc44.x86_64. Testing covered front controls, rear paddles,
Steam and Quick Access behavior, independent RGB effects, brightness/off
controls, and suspend/resume restoration. I also built the module with
W=1. X2 Mini Pro hardware testing remains outstanding.

All 15 patches apply cleanly to the stated base and pass git diff --check
and checkpatch.pl with zero errors and zero warnings.

Development and review:
https://github.com/OpenGamingCollective/linux-unstable/pull/13

I used LLM assistance for protocol analysis, implementation,
documentation, code review, and test orchestration.

Andrei Aldea (15):
  HID: hid-oxp: fix default M1 and M2 key mappings
  HID: hid-oxp: validate input report lengths before decoding
  HID: hid-oxp: retain fractional brightness when reading RGB status
  HID: hid-oxp: reject invalid Gen2 RGB status values
  HID: hid-oxp: fix multicolor LED intensity scaling
  HID: hid-oxp: serialize complete RGB updates
  HID: hid-oxp: select brightness policy for the new RGB effect
  HID: hid-oxp: stop configuration work during teardown
  HID: hid-oxp: keep configuration state per HID interface
  HID: hid-oxp: handle controller reinitialization across suspend
  HID: hid-oxp: group declarations and protocol definitions
  HID: hid-oxp: support three-page button maps on X2 controllers
  HID: hid-oxp: represent RGB LEDs with a common array
  HID: hid-oxp: add Gen3 joystick ring RGB support
  HID: hid-oxp: add X2 auxiliary RGB zones

 .../ABI/testing/sysfs-driver-hid-oxp          |  196 ++
 MAINTAINERS                                   |    1 +
 drivers/hid/hid-oxp.c                         | 1743 ++++++++++++++---
 3 files changed, 1623 insertions(+), 317 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-hid-oxp


base-commit: 50d05c7c76c96b90462f24debacca971d2e86713