Hi, FreeBSD laptop users

Following patch [1] bring in multitouch EVDEV support for Synaptics and Elan PS/2 touchpads found in many laptops. (And for generic relative PS/2 mices as well). This allows to replace our limited in-kernel gesture processor with full-blown
one from xf86-input-synaptics or xf86-input-libinput driver and makes
Synaptics and Elan PS/2 touchpad support to be mostly on par with Linux

Other mostly evdev-unrelated fixes and improvements are:

1. Fix rare but quite annoying issue in Elan hw v.4 touchpads support.
Triple-finger taps are reported as double-finger taps under several circumstances. 2. Adjust tap min queue size on Elans to make multifinger tap detection more reliable. 3. Adjust Elantech palm width threshold to nearly match synaptics defaults 4. Discard pointer movements rather then mouse packets on palm detection to reduce cursor jumping.
5. Enable palm detection on two finger touches for multitouch trackpads.
6. Reduce synaptics touch sensitivity
   Increase hw.psm.synaptics.min_pressure default value from 16 to 32
   to nearly match Linux driver (30-35 hysteresis loop).
   This makes libinput tap detection more reliable.
7. Serialize atkbdc ports and psm softc access with mutexes
   and mark psm interrupt and cdev handlers MPSAFE

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

How to test.

1. Apply patch [1]
2. Add `device evdev` and `options EVDEV_SUPPORT` to kernel config file and rebuild kernel 3. Add hw.psm.elantech_support=1 or hw.psm.synaptics_support=1 to /boot/loader.conf 4. Add kern.evdev.rcpt_mask=12 to /etc/sysctl.conf to enable psm source and disable sysmouse 5. Install x11-drivers/xf86-input-synaptics port compiled with EVDEV support enabled or
6. Tell XOrg to use synaptics or libinput driver as primary mouse driver:

Section "InputDevice"
    Identifier  "Mouse0"
    Driver      "synaptics"
#   Driver      "libinput"
    Option      "Device" "/dev/input/eventXXX"

Exact value of "/dev/input/eventXXX" can be obtained with evemu-record utiliy [2]. In most cases I have seen psm event device is located at /dev/input/event2.
Lenovo trackpoint should appear as separate relative event device and is
handled with xf86-input-evdev driver (not tested yet)
Note: Neither HAL nor DEVD Xorg configuration backends support evdev at present time so x11-servers/xorg-server should be recompiled w/o autoconfiguration support. Alternatively DEVD or UDEV backends from coming Xorg update [3] can be used
7. Reboot and test touchpad with XOrg or evemu-record

[1] psm(4) evdev support: https://reviews.freebsd.org/D10207
Raw diff: https://reviews.freebsd.org/file/data/pqjvpuhwfgsu5nnamibg/PHID-FILE-uuyjx66blb344hre3nc2/D10207.vson.id27478.whitespaceignore-most.diff [2] evemu port: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218383 Not commited yet. [3] Xorg 1.19.3 update: https://lists.freebsd.org/pipermail/freebsd-x11/2017-March/019100.html (Patch content is slightly garbled)

Vladimir Kondratyev
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