linux-kernel - Re: [PATCH] Console keyboard events and accessibility

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Date:	Tue, 21 Aug 2007 22:42:24 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>
cc:	linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, dtor@...l.ru
Subject: Re: [PATCH] Console keyboard events and accessibility


On Aug 21 2007 02:57, Samuel Thibault wrote:
>
>Some external modules like Speakup need to use the PC keyboard to control
>them and also need to get keyboard feedback (caps lock status, etc.)
>
>This adds a keyboard notifier that such modules can use to get the keyboard
>events and possibly eat them, at several stages:
>
>- keycodes: even before translation into keysym.

They can use the raw xlation for that. The "showkeys" utility and Xorg are
likely to do that. (In fact, there is a helping sysrq called Unraw in case
there are problems.)

>- unbound keycodes: when no keysym is bound.
>- unicode: when the keycode would get translated into a unicode character.
>- keysym: when the keycode would get translated into a keysym.
>- post_keysym: after the keysym got interpreted, so as to see the result
>  (caps lock, etc.)

For all these, I think new xlats should be added that have the desired
behavior.

>+	int shift;		/* Current shift mask */
>+	unsigned int value;	/* keycode, unicode value or keysym */
>+};
>+
>+extern int register_keyboard_notifier(struct notifier_block *nb);
>+extern int unregister_keyboard_notifier(struct notifier_block *nb);
> #endif
> 
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