linux-kernel - [PATCH] Fujitsu U810 keyboard light support

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Message-ID: <20080608204948.GA22405@panic.cs-bristol.org.uk>
Date:	Sun, 8 Jun 2008 21:49:48 +0100
From:	Julian Brown <jules@...ic.cs-bristol.org.uk>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH] Fujitsu U810 keyboard light support

Hi,

This patch contains support for the Fujitsu U810 mini-laptops'
keyboard-illuminating "headlights". Information on how to control these
was reverse-engineered from the ACPI DSDT and from disassembling the
Windows driver for the device (i.e. it's not 100% certain that this
patch won't make your laptop explode, but it works for me. A more likely
problem is that I might have broken support for other Fujitsu laptops,
but I can't test that).

The patched fujitsu-laptop module creates two entities in the /sys
hierarchy:

  /sys/devices/platform/fujitsu-laptop/kbd_light
  /sys/class/leds/kbd_light/*

So that then, the lights can be controlled by reading/writing to these
files. (Probably not all the LED class things are relevant, though).

The fujitsu-laptop module before patching only uses the FUJ02B1 ACPI "HID"
(namespace? Identifier?), but the keyboard LEDs (as well as several other
possibly-interesting things) hang off the FUJ02E3 ("FEXT") HID. I'm not
sure if adding the latter to the existing driver (vs. creating a new one)
was the right thing to do, but I think it's probably sensible.

Any comments/suggestions?

Thanks,

Julian

(Please CC me on replies.)

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