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authorFrederic Weisbecker <fweisbec@gmail.com>2009-09-23 17:08:43 -0400
committerFrederic Weisbecker <fweisbec@gmail.com>2009-09-23 17:08:43 -0400
commitd7a4b414eed51f1653bb05ebe84122bf9a7ae18b (patch)
treebd6603a0c27de4c138a1767871897e9cd3e1a1d2 /Documentation/leds-class.txt
parent1f0ab40976460bc4673fa204ce917a725185d8f2 (diff)
parenta724eada8c2a7b62463b73ccf73fd0bb6e928aeb (diff)
Merge commit 'linus/master' into tracing/kprobes
Conflicts: kernel/trace/Makefile kernel/trace/trace.h kernel/trace/trace_event_types.h kernel/trace/trace_export.c Merge reason: Sync with latest significant tracing core changes.
Diffstat (limited to 'Documentation/leds-class.txt')
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1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/leds-class.txt b/Documentation/leds-class.txt
index 6399557cdab3..8fd5ca2ae32d 100644
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@@ -1,3 +1,4 @@
1
1LED handling under Linux 2LED handling under Linux
2======================== 3========================
3 4
@@ -5,10 +6,10 @@ If you're reading this and thinking about keyboard leds, these are
5handled by the input subsystem and the led class is *not* needed. 6handled by the input subsystem and the led class is *not* needed.
6 7
7In its simplest form, the LED class just allows control of LEDs from 8In its simplest form, the LED class just allows control of LEDs from
8userspace. LEDs appear in /sys/class/leds/. The brightness file will 9userspace. LEDs appear in /sys/class/leds/. The maximum brightness of the
9set the brightness of the LED (taking a value 0-255). Most LEDs don't 10LED is defined in max_brightness file. The brightness file will set the brightness
10have hardware brightness support so will just be turned on for non-zero 11of the LED (taking a value 0-max_brightness). Most LEDs don't have hardware
11brightness settings. 12brightness support so will just be turned on for non-zero brightness settings.
12 13
13The class also introduces the optional concept of an LED trigger. A trigger 14The class also introduces the optional concept of an LED trigger. A trigger
14is a kernel based source of led events. Triggers can either be simple or 15is a kernel based source of led events. Triggers can either be simple or