[Bug 232040] wmt driver fails to attach to Synaptics Touchscreen

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232040

            Bug ID: 232040
           Summary: wmt driver fails to attach to Synaptics Touchscreen
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: sakhmatd at darkn.space

I have a Lenovo YOGA 12 Thinkpad with a Synaptics Touchscreen. 

It gets detected as 

ugen0.2: <SYNAPTICS Synaptics Touch Digitizer V04> at usbus0, cfg=0 md=HOST
spd=FULL (12Mbps) pwr=ON (400mA)

by usbconfig and I get a corresponding /dev/uhid0 device.

usbconfig -d ugen0.2 dump_all_desc:
https://ghostbin.com/paste/3fq7o

I can get the touchscreen working through webcamd, but the touch screen has
issues detecting ButtonRelease when configured that way.

Trying to hook /dev/uhid0 up as a mouse through xorg.conf gives me a segfault
when launching X.

I also have a usb_quirk setup to make the touchscreen get ignored by UMS, since
moused likes to attach itself to it every time in the console. It does not seem
to function as ums0, however.

Synaptics driver doesn't work with it either.

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