09-05-2016
I can't say anything about Linux, but in FreeBSD it would not be really hard.
You just have to tell devd (and possibly Xorg) to ignore that specific keyboard. If can do that, you are free to read /dev/ukbd0 (or ukbd1) as you please. What you get from there might be ascii or scancodes, or you might be able to choose.
It should be similar in Linux, devd is called udev there, I think.
Juha
This User Gave Thanks to Juha Nurmela For This Post:
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LEARN ABOUT OSX
setkeycodes
SETKEYCODES(8) Keyboard Support SETKEYCODES(8)
NAME
setkeycodes - load kernel scancode-to-keycode mapping table entries
SYNOPSIS
setkeycodes scancode keycode ...
DESCRIPTION
The setkeycodes command reads its arguments two at a time, each pair of arguments consisting of a scancode (given in hexadecimal) and a
keycode (given in decimal). For each such pair, it tells the kernel keyboard driver to map the specified scancode to the specified keycode.
This command is useful only for people with slightly unusual keyboards, that have a few keys which produce scancodes that the kernel does
not recognize.
THEORY
The usual PC keyboard produces a series of scancodes for each key press and key release. (Scancodes are shown by showkey -s, see
showkey(1).) The kernel parses this stream of scancodes, and converts it to a stream of keycodes (key press/release events). (Keycodes
are shown by showkey.) Apart from a few scancodes with special meaning, and apart from the sequence produced by the Pause key, and apart
from shiftstate related scancodes, and apart from the key up/down bit, the stream of scancodes consists of unescaped scancodes xx (7 bits)
and escaped scancodes e0 xx (8+7 bits). To these scancodes or scancode pairs, a corresponding keycode can be assigned (in the range
1-127). For example, if you have a Macro key that produces e0 6f according to showkey(1), the command
setkeycodes e06f 112
will assign the keycode 112 to it, and then loadkeys(1) can be used to define the function of this key.
Some older kernels might hardwire a low scancode range to the equivalent keycodes; setkeycodes will fail when you try to remap these.
2.6 KERNELS
In 2.6 kernels key codes lie in the range 1-255, instead of 1-127. (It might be best to confine oneself to the range 1-239.)
In 2.6 kernels raw mode, or scancode mode, is not very raw at all. The code returned by showkey -s will change after use of setkeycodes.
A kernel bug. See also showkey(1).
OPTIONS
None.
BUGS
The keycodes of X have nothing to do with those of Linux. Unusual keys can be made visible under Linux, but not under X.
SEE ALSO
dumpkeys (1), loadkeys (1), showkey (1), getkeycodes (8)
Local 8 Nov 1994 SETKEYCODES(8)