[Bug 250724] USB gamepads are tagged as a mouse by udev

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250724

--- Comment #3 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Alex S from comment #2)
> X11 itself lacks any support for joysticks,
> it only knows (and able to present to applications)
> keyboard and pointer devices.
Actually, X11 does know of joystick presence. See udev autoconfiguration
backend sources:
https://gitlab.freedesktop.org/xorg/xserver/-/blob/master/config/udev.c#L254

But... FreeBSD does not have sysfs and most likely will never have, so libudev
is a shim which uses libmagic-alike heuristics taken from xf86-input-evdev to
detect device type and type tag based on device's evdev descriptor: 
https://github.com/FreeBSDDesktop/libudev-devd/blob/master/udev-utils.c#L410

It is highly likely that this logic was not ever tested and just does not work
in joystick part. So we can try to fix it or e.g. steal from alternative
udev-shim library:
https://github.com/jiixyj/libudev-fbsd/blob/master/src/libudev.c#L245

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