[Bug 218495] New: NKRO does not work on Mistel MD770 (Holtek Semiconductor, Inc. USB-HID Keyboard)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218495

            Bug ID: 218495
           Summary: NKRO does not work on Mistel MD770 (Holtek
                    Semiconductor, Inc. USB-HID Keyboard)
           Product: Drivers
           Version: 2.5
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: USB
          Assignee: drivers_usb@kernel-bugs.kernel.org
          Reporter: ishitatsuyuki@gmail.com
        Regression: No

Created attachment 305872
  --> https://bugzilla.kernel.org/attachment.cgi?id=305872&action=edit
BPF program to fix the quirk

My Mistel MD770 (04d9:0339 Holtek Semiconductor, Inc. USB-HID Keyboard) seems
to have a descriptor quirk that prevents NKRO from working. A device
descriptor, a hid capture of NKRO sequence and proposed BPF program for fix is
attached.

It's the exact same error as the Topre quirk [1], but the descriptor and offset
is different.

NKRO works on Windows without extra vendor drivers. I'm not sure if Microsoft
just has a better quirk database, or they have some clever heuristics to detect
this. Before copy pasting the Topre code and calling it a patch, I would like
to ask about what's the best way to fix this.

[1]: https://gitlab.freedesktop.org/libinput/libinput/-/issues/804

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