[PATCH 0/4] HID: lg-g15: G15 v2 LCD and game-mode support

[Torstein Eide <torsteine+linux@gmail.com>]

This series adds support for more of the Logitech G15 v2 hardware to
hid-lg-g15, plus a fix for the remove path.

Patch 1 exposes the GamePanel LCD contrast as a g15::lcd_contrast LED.

Patch 2 adds an optional fbdev framebuffer (HID_LOGITECH_G15_FB) for
the 160x43 monochrome LCD, updated through deferred I/O, so userspace
can draw on the LCD or bind fbcon to it without libg15/g15daemon.

Patch 3 binds the G15 v2's second interface (046D:C226), which is
currently handled by hid-generic, and exposes the Super-key-lock
("Game Mode") state as a read-only g15::game_mode LED. Normal key
input on that interface is left to hid-input.

Patch 4 fixes a use-after-free on remove: the LED work can be
rescheduled by a key press between cancel_work_sync() and
hid_hw_stop(). The bug predates this series, but the patch is
written against the remove path as changed by patches 1-3, so
it does not apply to the current tree on its own.

The LCD wire format and contrast commands follow libg15, hence the
Based-on-work-by tags for its authors.

All patches were tested on a Logitech G15 v2.

Torstein Eide (4):
  HID: lg-g15: add LCD contrast LED
  HID: lg-g15: add LCD pixel-content framebuffer
  HID: lg-g15: report Super-key-lock state on G15 v2's keyboard
    interface
  HID: lg-g15: cancel LED work only after stopping the hardware

 drivers/hid/Kconfig      |  13 +
 drivers/hid/hid-ids.h    |   1 +
 drivers/hid/hid-lg-g15.c | 599 ++++++++++++++++++++++++++++++++++++++-
 3 files changed, 606 insertions(+), 7 deletions(-)

-- 
2.53.0