linux-kernel - Re: [PATCH] kbd: (#7063) make CapsLock work as expected even for non-ASCII

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Date:	Thu, 19 Nov 2009 16:18:54 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	hpa@...or.com, alan@...rguk.ukuu.org.uk, mgarski@...t.pl
Subject: Re: [PATCH] kbd: (#7063) make CapsLock work as expected even for
 non-ASCII

On Tue, Nov 17, 2009 at 02:23:58PM +0100, Samuel Thibault wrote:
> Alexey Dobriyan, le Tue 17 Nov 2009 14:55:03 +0300, a écrit :
> > On Tue, Nov 17, 2009 at 12:15:20AM +0100, Samuel Thibault wrote:
> > > Alexey Dobriyan, le Tue 17 Nov 2009 02:05:23 +0300, a écrit :
> > > > On Mon, Nov 16, 2009 at 11:54:29PM +0100, Samuel Thibault wrote:
> > > > > Samuel Thibault, le Mon 16 Nov 2009 23:27:38 +0100, a écrit :
> > > > > > > My keymap contains
> > > > > > > 
> > > > > > > 				keycode 44 = +z
> > > > > > > 		shift           keycode 44 = +Z
> > > > > > > 	altgr                   keycode 44 = U+044F        # CYRILLIC SMALL LETTER YA
> > > > > > > 	altgr   shift           keycode 44 = U+042F        # CYRILLIC CAPITAL LETTER YA
> > > > > > 
> > > > > > And U+044F / U+042F is not KT_LETTER.
> > > > > > 
> > > > > > Yes, there's no way you can express a unicode character in KT_LETTER.
> > > > > > Limited interface, but that's not a reason to break other interfaces.
> > > > > 
> > > > > One way to go would be to decrete that keysyms between 0xD800 and 0xE000
> > > > 
> > > > And this is going to help me with U+042F/U+044F how?
> > 
> > > --- a/drivers/char/keyboard.c
> > > +++ b/drivers/char/keyboard.c
> > > @@ -1258,6 +1258,15 @@ static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
> > >  	type = KTYP(keysym);
> > >  
> > >  	if (type < 0xf0) {
> > > +		if (keysym >= 0xD800 && keysym < 0xE000) {
> > 
> > keysym is 0x044F at this point.
> 
> I'm precisely suggesting that instead of 0x044F, the keymap provides
> 0xdc4f, just like for +z the keysym is not K(KT_LATIN,0x0079), but
> K(KT_LETTER,0x79) (that's the difference between just z and +z, i.e.
> whether it's KT_LATIN or KT_LETTER, i.e. whether capslock acts on it or
> not, that's the whole point of capslock vs shift lock!).
> 
> More precisely, in the kbd source code, in the add_capslock function, in
> the unicode case, instead of ignoring the '+', add 0xD800 to the unicode
> value if it is below 0x0800.

You suggest to change kernel and keymap and kbd and introduce 0xD800 hack.
This is not going to fly.

> But again, that's a very limited fix and just fixing the LED interface
> would allow to just use modifiers and permit much more powerful keymaps.
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