AppleSMC: Support inotify on light sensor to adjust keyboard backlight

[Nico Schottelius <nico-linux-20111013@schottelius.org>]

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

-- 
PGP key: 7ED9 F7D3 6B10 81D7 0EC5  5C09 D7DC C8E4 3187 7DF0