Hi, all

Following patch [1] adds support for generic MS Windows 7/8/10 - compatible USB HID multi-touch touchscreens via evdev protocol. It is intended to be a native replacement of hid-miltitouch.c driver found in Linux distributions and multimedia/webcamd port.

Patch is made for 12-CURRENT and most probably can be applied to recent 11-STABLE and 11.1-RELEASE (not tested)

How to test.

1. Apply patch [1]
2. To compile this driver into the kernel, place the following lines into your kernel configuration file:
      device wmt
      device usb
      device evdev
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
3. Install x11-drivers/xf86-input-evdev or x11-drivers/xf86-input-libinput port
4. Tell XOrg to use evdev or libinput driver for the device:

Section "ServerLayout"
    InputDevice    "TouchScreen0" "SendCoreEvents"

Section "InputDevice"
    Identifier  "TouchScreen0"
    Driver      "evdev"
#   Driver      "libinput"
    Option      "Device" "/dev/input/eventXXX"

Exact value of "/dev/input/eventXXX" can be obtained with evemu-record utility from devel/evemu.

Note1: Currently, driver does not support pens or touchpads.
Note2: wmt.ko should be kld-loaded before uhid driver to take precedence over it! Otherwise uhid can be kld-unloaded after loading of wmt.

[1] wmt review: https://reviews.freebsd.org/D12017
Raw diff: https://reviews.freebsd.org/file/data/ruebvnmyzymnhc7ho37f/PHID-FILE-nue7bjzefxyvwjkcfepd/D12017.diff

Vladimir Kondratyev
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