linux-kernel - [patch 0/2] [PATCH] input: correctly handle keys without hardware release event

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Date:	Fri, 11 May 2007 19:23:26 +0200
From:	Giel de Nijs <giel@...feinetrip.com>
To:	linux-kernel@...r.kernel.org
Cc:	Vojtech Pavlik <vojtech@...e.cz>,
	Dimitry Torokhov <dmitry.torokhov@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Matt Domsch <matt_domsch@...l.com>,
	Rezwanul Kabir <rezwanul_kabir@...l.com>,
	linux-input@...ey.karlin.mff.cuni.cz
Subject: [patch 0/2] [PATCH] input: correctly handle keys without hardware release event

Hi,

This patch adds a soft release key mask to input_dev, to enable keyboard
drivers to determine which keys never generate a hardware release event and
hence add a release event after every press event of such keys. The mask is
controlled by ioctls.

The Fn+F? key combinations of Dell Latitude series laptops (and possibly other
Dells or other brands) only generate a key press event and never a key release
event, which is most probable a hardware flaw (or feature?). Due to this flaw,
combinations like Fn+F1 for hibernate and Fn-F3 for showing battery status
cannot be used. Ubuntu has probably fixed this by patching the X input layer
and HAL, but other distributions (like Debian) cannot use these keys. This
patch adds a generic method to signal if keys with certain scancodes never
generate release events, so the keyboard driver can add those events right
after a key press event.

The ioctls used to read and write to this bitmask might be used in a program
like setkeycodes, which is normally used to map certain scancodes to keycodes.
With a command line option, this program could also set the soft release bit
for a certain scancode if desired. Patches for setkeycodes and getkeycodes
against the Debian console-tools can be found at
http://giel.operation0.org/keyboard-soft-release

This patch also uses the infrastructure for generating release events for
KEY_HANGEUL and KEY_HANJA, something which was already done in atkbd.c.

See also this thread: http://thread.gmane.org/gmane.linux.kernel/401378

Greetings,
Giel
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