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

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Message-ID: <20090109214357.GH5073@const.famille.thibault.fr>
Date:	Fri, 9 Jan 2009 22:43:57 +0100
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	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

Alan Cox, le Fri 09 Jan 2009 21:35:55 +0000, a écrit :
> Samuel Thibault <samuel.thibault@...-lyon.org> wrote:
> 
> > Came somebody have a look at this?  The need is real, the only question
> > that comes to my mind is whether notifiers are allowed to modify the
> > param they are given.  Since they are not marked const, I'd guess it'd
> > be ok?
> 
> The notifier code doesn't care.

I know, but I'm asking about current practice.

> > Make kbd_keycode() read param.value after calling the keyboard notification
> > chain, to let the callee change the translation on the fly. This for instance
> > permits to remap the physical positions of the keys independently of the
> > configured keymap, for e.g. single-handed people.
> 
> Surely that is just a new keymap ?

No. That would mean a lot of keymapSSS. Doing it the keymap way
would require to have us, us-revert-left, us-revert-right, en-uk,
uk-revert-left, uk-revert-right, etc. I really don't like that approach,
thus the "independently of the configured keymap".

This really is a problem that is orthogonal to keymaps: I'm here talking
about _physical_ keys remapping, not remapping what is printed on them
(which is done after that).

Samuel
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