linux-kernel - AppleSMC: Support inotify on light sensor to adjust keyboard backlight

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Date:	Thu, 13 Oct 2011 19:56:49 +0200
From:	Nico Schottelius <nico-linux-20111013@...ottelius.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Henrik Rydberg <rydberg@...omail.se>,
	Nicolas Boichat <nicolas@...chat.ch>,
	Jesper Juhl <jesper.juhl@...il.com>,
	Robert Love <rml@...ell.com>,
	Nico Schottelius <nico-linux-20111013@...ottelius.org>
Subject: AppleSMC: Support inotify on light sensor to adjust keyboard
 backlight

Hello LKML,

I've written a small utility to adjust the keyboard backlight
on the Mac Book Air 4,2 depending on the information on the light
sensor [0].

Now is my problem that
  /sys/bus/platform/drivers/applesmc/applesmc.768/light
seems not to emit inotify events, if the content changes.
This feature would be great, so I do not need to do a
"while true; sleep X; done"-loop.

As I've no clue about inotify support in kernel, I'd be happy
if someone of you would implement this or else give me a pointer
on how to do so.

Secondly, having this feature for 
  /sys/bus/platform/drivers/applesmc/applesmc.768/leds/smc::kbd_backlight/brightness
as well, might be useful for other tools monitoring the keyboard
backlight brightness.

Cheers,

Nico

[0] http://git.schottelius.org/?p=kbsd;a=summary
    git://git.schottelius.org/kbsd

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