- https://www.kernel.org/doc/Documentation/input/input.txt
- https://www.kernel.org/doc/Documentation/input/joystick.txt
- https://stackoverflow.com/questions/15949163/read-from-dev-input#15949311

`/proc/bus/input/devices`

`/sys/class/input`

----------

{{{
$ jstest /dev/input/js0
}}}