Needed to remap keys on my ELECOM Huge Trackball, so I wrote a .conf file to be loaded at boot by X.
The ELECOM Huge has 12 keys you can assign. I will be remapping Fn1 and Fn2 which are near my index finger to be used as regular Left Click and Middle Click
| Code | Default Key | Remap Key |
|---|---|---|
| 1 | Left | Left |
| 2 | Middle | Middle |
| 3 | Right | Right |
| 4 | Scroll Up | Scroll Up |
| 5 | Scroll Down | Scroll Down |
| 6 | Tilt Left | Tilt Left |
| 7 | Tilt Right | Tilt Right |
| 8 | Back | Back |
| 9 | Forward | Forward |
| 10 | Fn1 | Left |
| 11 | Fn2 | Middle |
| 12 | Fn3 | Fn3 |
I'm using libinput and you can get any related info about the keys you can remap and the name of the device you need to refer to in the config file using xinput. You can list which keys you can remap and also set the new remap on the fly.
$ xinput list
...
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ ....
⎜ ↳ ELECOM TrackBall Mouse HUGE TrackBall id=8 [slave pointer (2)]
⎜ ↳ ....
...
$ xinput get-button-map 8
1 2 3 4 5 6 7 8 9 10 11 12
$ xinput set-button-map 8 1 2 3 4 5 6 7 8 9 1 2 12
To make the change permanent, we need to create a file named 20-elecom-huge.conf in /etc/X11/xorg.conf.d that will load when startx runs
20-elecom-huge.conf
Section "InputClass"
Identifier "ELECOM TrackBall Mouse"
MatchProduct "HUGE TrackBall"
# MatchVendor "ELECOM TrackBall Mouse HUGE TrackBall "
# MatchIsPointer "on"
Driver "libinput"
Option "AccelSpeed" "0.2"
Option "Buttons" "12"
Option "ButtonMapping" "1 2 3 4 5 6 7 8 9 1 2 12" # L Middle R ScrollU ScrollD TiltL TiltR Back Forw Fn1 Fn2 Fn3 (Fn1 is L, Fn2 is Mid)
Option "EmulateWheel" "true"
Option "EmulateWheelButton" "12"
Option "EmulateWheelTimeout" "0"
Option "ScrollMethod" "Button"
Option "ScrollButton" "12"
EndSection
https://www.reddit.com/r/Trackballs/comments/qo8x3c/elecom_huge_libinput_help/
https://bbs.archlinux.org/viewtopic.php?id=254470
http://www.mario-konrad.ch/blog/linux/libinput-elecom-huge.html