How to support new buttons?

[Nils Faerber <nils-t93Ne7XHvje5bSeCtf/tX7NAH6kLmebB@public.gmane.org>]

Hi all!
First off: Many thanks for your big efforts on getting ACPI into Linux!
ACPI is not at all easy (from what I have seen now) and it is a lot of
work. I appreciate this very much.

So. And now that I own a brand new laptop which only works partially
with ACPI I would like to help a little. As a small first task I would
like to support the additional buttons I have here which very obviously
cause ACPI events. The machine I am talking about is an Asus L3800C.
This machine has four hotkey on top of the keyboard. One is supposed to
be a speedstep control button, on is "email" (what nonsense :), and the
other two have some strange symbols on them (no idea what they are
supposed to be good for). When I enable ACPI debugging I can see that
"something" happens when I press those buttons and this "something" is
different for all four of them. Oh, and ACPI interrupt is triggered on
press. But /proc/acpi/event does not show an event.
I suspect that those buttons are simply not supported by the button
driver yet. Looking at button.c I see that only power, sleep and lid are
supported.

So, how can I add support for those additional buttons?
Oh, I don't expect a detailed a full answer. Just a pointer for an ACPI
newbe please :)

CU
  nils faerber

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