[PATCH v2 00/16] HID: Add Legion Go and Go S Drivers

["Derek J. Clark" <derekjohn.clark@gmail.com>]

This series adds configuration driver support for the Legion Go S,
Legion Go, and Legion Go 2 built-in controller HID interfaces. This
allows for configuring hardware specific attributes such as the auso
sleep timeout, rumble intensity, etc. non-configuration reports are
forwarded to the HID subsystem to ensure no loss of functionality in
userspace. Basic gamepad functionality is provided through xpad, while
advanced features are currently only implemented in userspace daemons
such as InputPlumber[1]. I plan to move this functionality into the
kernel in a later patch series.

Three new device.h macros are added that solve a fairly specific
problem. Many of the attributes need to have the same name as other
attributes when they are in separate attribute subdirectories. The
previous version of this series, along with the upcoming his-asus-ally
driver[2] use this macro to simplify the sysfs by removing redundancy.
An upcoming out of tree driver for the Zotac Zone [3] also found this
macro to be useful. This greatly reduces the path length and term
redundancy of file paths in the sysfs, while also allowing for cleaner
subdirectories that are grouped by functionality. Rather than carry the
same macro in four drivers, it seems beneficial to me that we include the
macro with the other device macros.

A new HID uevent property is also added, HID_FIRMWARE_VERSION, so as to
permit fwupd to read the firmware version of the Go S HID interface without
detaching the kernel driver.

Finally, there are some checkpatch warnings that will need to be surpressed:
WARNING: ENOSYS means 'invalid syscall nr' and nothing else
1292: FILE: drivers/hid/lenovo-legos-hid/lenovo-legos-hid-config.c:1085:
+       case -ENOSYS: /* during rmmod -ENOSYS is expected */

This error handling case was added as it is experienced in the real world
when the driver is rmmod. The LED subsystem produces this error code in
its legacy code and this is not a new novel use of -ENOSYS, we are simply
catching the case to avoid spurious errors in dmesg when the drivers are
removed.

[1]: https://github.com/ShadowBlip/InputPlumber/tree/main/src/drivers/lego
[2]: https://lore.kernel.org/all/20240806081212.56860-1-luke@ljones.dev/
[3]: https://github.com/flukejones/linux/tree/wip/zotac-zone-6.15/drivers/hid/zotac-zone-hid
Signed-off-by: Derek J. Clark <derekjohn.clark@gmail.com>
---
Change Log
V2:
  - Break up adding the Go S driver into feature specific patches
  - Drop the arbitrary uevent properties patch
  - Add Go serires driver
  - Move DEVICE_ATTR_NAMED macros to device.h
V1:

Derek J. Clark (15):
  include: device.h: Add named device attributes
  HID: hid-lenovo-go: Add Lenovo Legion Go Series HID Driver
  HID: hid-lenovo-go: Add Feature Status Attributes
  HID: hid-lenovo-go: Add Rumble and Haptic Settings
  HID: hid-lenovo-go: Add FPS Mode DPI settings
  HID: hid-lenovo-go: Add RGB LED control interface
  HID: hid-lenovo-go: Add Calibration Settings
  HID: hid-lenovo-go: Add OS Mode Toggle
  HID: hid-lenovo-go-s: Add Lenovo Legion Go S Series HID Driver
  HID: hid-lenovo-go-s: Add MCU ID Attribute
  HID: hid-lenovo-go-s: Add Feature Status Attributes
  HID: hid-lenovo-go-s: Add Touchpad Mode Attributes
  HID: hid-lenovo-go-s: Add RGB LED control interface
  HID: hid-lenovo-go-s: Add IMU and Touchpad RO Attributes
  HID: Add documentation for Lenovo Legion Go drivers

Mario Limonciello (1):
  HID: Include firmware version in the uevent

 .../ABI/testing/sysfs-driver-hid-lenovo-go    |  724 +++++
 .../ABI/testing/sysfs-driver-hid-lenovo-go-s  |  304 +++
 MAINTAINERS                                   |    9 +
 drivers/hid/Kconfig                           |   24 +
 drivers/hid/Makefile                          |    2 +
 drivers/hid/hid-core.c                        |    5 +
 drivers/hid/hid-ids.h                         |    7 +
 drivers/hid/hid-lenovo-go-s.c                 | 1577 +++++++++++
 drivers/hid/hid-lenovo-go.c                   | 2399 +++++++++++++++++
 include/linux/device.h                        |   46 +
 include/linux/hid.h                           |    1 +
 11 files changed, 5098 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-hid-lenovo-go
 create mode 100644 Documentation/ABI/testing/sysfs-driver-hid-lenovo-go-s
 create mode 100644 drivers/hid/hid-lenovo-go-s.c
 create mode 100644 drivers/hid/hid-lenovo-go.c

-- 
2.51.2