linux-kernel - Re: Re (hello?): [PATCH] Let keyboard notifiers modify key codes

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Message-ID: <20090112225112.GE5026@const.famille.thibault.fr>
Date:	Mon, 12 Jan 2009 23:51:12 +0100
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Derek Fawcus <dfawcus@...co.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, dmitry.torokhov@...il.com,
	linux-input@...r.kernel.org
Subject: Re: Re (hello?): [PATCH] Let keyboard notifiers modify key codes

Derek Fawcus, le Mon 12 Jan 2009 22:36:21 +0000, a écrit :
> On Fri, Jan 09, 2009 at 11:23:41PM +0100, Samuel Thibault wrote:
> > Alan Cox, le Fri 09 Jan 2009 22:01:44 +0000, a écrit :
> > > > > Surely that is just a new keymap ?
> > > > 
> > > > No. That would mean a lot of keymapSSS. Doing it the keymap way
> > > 
> > > Why - its an  algorithmic question about how to edit them - remember you
> > > can edit keymaps in programs at runtime and live.
> > 
> > Right. I'm still afraid by that: we'd need to know how to remap the
> > various keycodes (amiga, atari, i386, mc, sun).
> 
> Err - just use EVIOCSKEYCODE to swap the keycodes around,  this works
> in terms of the evdev keycodes.  I use it in a small program to swap
> around a bunch of keys.
> 
> A bit more of a challange would be listening to evdev,  and when
> detecting the 'swap' keycode,  doing the reload with the actual swaps.

Yes, that seems a bit unsafe to me.  Another solution is to just grab
all the keyboard devices, and reemit the wanted evdev keycodes.  Quite
clumsy.

> I'm not sure w/o reading the code if the kernel will allow this to be
> shared between the tty and evdev on the same vt,

What do you mean by "this"?  The raw keycode -> input keycode
translation?  My guess is that it is recorded for the device itself, not
related to things like VTs, and thus is global.

> but then one could run a controller program talking through a pty and
> direct to the keyboard.

Ugh.  I'd prefer grabing evdev rather that using a pty.

Samuel
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