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AYANEO has multiple models that all use the same AT Translated Set 2 Keyboard device with 3-4 buttons available. Starting with the AYANEO 2 there was a change to the IMU programming they were using that caused the scancodes to no longer present the correct values in Linux. This change adds a blanket scancode mapping to present the correct keycodes as designed by the OEM. In some cases a kernel bug will cause the AT Translated Set 2 Keyboard to present as an AT Raw Set 2 keyboard. I have also adjusted the scancodes for this scenario as well so they are in line with expected behavior. Currently only the Kun is still experiencing this bug. Example userspace tool refs: https://github.com/ShadowBlip/InputPlumber/blob/main/rootfs/usr/lib/udev/hwdb.d/59-inputplumber.hwdb https://github.com/ShadowBlip/HandyGCCS/blob/main/usr/lib/udev/hwdb.d/59-handygccs-ayaneo.hwdb https://github.com/hhd-dev/hhd/tree/master/usr/lib/udev/hwdb.d
Files in this directory specify a description of hardware devices, in the form of mappings from modalias-like keys (which identify specific hardware devices) to udev properties. Files in this directory are not read by udev directly. Instead, man:systemd-hwdb(8) compiles them into a binary database. See man:hwdb(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of the udev daemon. Use 'systemd-analyze cat-config udev/hwdb.d' to display the effective config.