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

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Date:	Mon, 16 Nov 2009 23:54:29 +0100
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Alexey Dobriyan <adobriyan@...il.com>, 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

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
(unused anyway) are "KT_LETTER" versions of the unicode 0x0000 - 0x0800.
That however covers only part of Unicode and doesn't solve the case of
keyboards where the upper case of a letter is not simply at the shifted
position.

The real correct solution is really to have kbd use modifiers just like
console-setup and provide a way for them to configure which leds should
be lit when some modifier is locked.  That way building a keymap becomes
just orthogonal, no need to upload a table of lower/upper pairs (which
depend on the locale see for instance i/I vs i/İ).

Samuel
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