linux-kernel - [PATCH] Jornada 720: Fixes "Invalid argument" when changing backlight brightness.

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Message-Id: <1329958651-8575-1-git-send-email-chris.diamand@gmail.com>
Date:	Thu, 23 Feb 2012 00:57:30 +0000
From:	Chris Diamand <chris.diamand@...il.com>
To:	kristoffer.ericson@...il.com
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	Chris Diamand <chris.diamand@...il.com>
Subject: [PATCH] Jornada 720: Fixes "Invalid argument" when changing backlight brightness.

Sorry - this patch I just sent is for kernels 2.6.24/2.6.26.
(I think it's actually been fixed on versions >3.0 but they versions don't
seem to work on the jornada for various other reasons...)

Thanks,
Chris.

---------------------
On jornada 720. Running:
echo n > /sys/class/backlight/s1d13806fb/brightness
would give a "write error: Invalid argument" as the max_brightness
was not set, so any value other that 0 exceeds it. Now sets
max_brightness to 255 when the module is loaded.

Backlight can also be turned on and off using
echo 0-4 > /sys/class/backlight/s1d13806fb/bl_power

Also added some extra braces so jornada720_ssp.c.

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