Hi Vladimir,
this patch works great for me!
I'm testing this with a semi-mt Synaptics touchpad and a TrackPoint of a Lenovo T420. I'm running 12-CURRENT (amd64) and Xorg 1.19.3 from Matthew's CFT with the libudev-devd backend. The Evdev devices are picked up correctly by libudev-devd and xf86-input-libinput (even the TrackPoint). I haven't tested this with xf86-input-synaptics (which is in maintenance mode) or xf86-input-evdev. I am not
using xf86-input-mouse or xf86-input-keyboard.

What works (everything):
- true smooth scrolling with Xinput2 (tested with GTK3 Firefox or gtk3-demo)
 - TrackPoint scrolling holding the middle button
 - both horizontal/vertical scrolling
- two finger scrolling powered by libinput (this semi-mt touchpad doesn't really support more gestures than this)

The only thing that doesn't work out of the box is the mouse pointer on the VT console. It wouldn't be hard though to write a small tool that uses libinput to translate Evdev events into CONS_MOUSECTL ioctls needed for the VT pointer.

Some comments:
- PS2_MOUSE_SYNAPTICS_PRODUCT should be 0x0007, not 0x0009 (http://lxr.free-electrons.com/source/drivers/input/mouse/psmouse.h#L86) - The TrackPoint should be added with product id 0x000A as on Linux and with the INPUT_PROP_POINTING_STICK Evdev property set - I think it would be better if the same Evdev device names were exposed as on Linux (for example "SynPS/2 Synaptics TouchPad"). Many scripts using xinput to change device properties depend on the Linux device names.

I've added a patch and comments to https://reviews.freebsd.org/D10265 .

Even Linux 64-bit binaries work correctly with the created /dev/input/event* devices after applying those two patches here:
 - https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218625
 - https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218627

This will be very useful for Linux games using joysticks, game controllers etc.

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