[Bug 252236] atp(4): Need EVDEV support for modern input stack

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252236

--- Comment #19 from Vladimir Kondratyev <wulf at freebsd.org> ---
(In reply to Greg V from comment #18)
> hmm right now quirks can only exclude a whole device, not just an interface.
> That would prevent usbhid from attaching to the keyboard interface.
Does touchpad interface have a HID report descriptor?
If it has and it is properly sized, we can move wsp to hidbus.
If no than we can try to ignore HID-class usb devices which do not have report
descriptor or boot protocol support.

> Looks like it didn't help.
That is strange. USB xfers starts with calling of usbd_transfer_start() in
wsp_start_read(), and I can`t understand yet what blocks them when
wsp_ev_open() is called from evdev when event device node is open()-ed.

> hmm does the usb_fifo_alloc_buffer stuff matter?
Directly only for /dev/wsp0 

> (also looks like closing moused would always kill evdev events -
> wsp_fifo_stop_read doesn't check for evdev)
Yes. This is inherited from ums(4). I tried to fix this in previous patch but
it appeared to be broken too.

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