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Diffstat (limited to 'Documentation/leds-class.txt')
| -rw-r--r-- | Documentation/leds-class.txt | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/leds-class.txt b/Documentation/leds-class.txt index 6399557cdab3..8fd5ca2ae32d 100644 --- a/Documentation/leds-class.txt +++ b/Documentation/leds-class.txt | |||
| @@ -1,3 +1,4 @@ | |||
| 1 | |||
| 1 | LED handling under Linux | 2 | LED handling under Linux |
| 2 | ======================== | 3 | ======================== |
| 3 | 4 | ||
| @@ -5,10 +6,10 @@ If you're reading this and thinking about keyboard leds, these are | |||
| 5 | handled by the input subsystem and the led class is *not* needed. | 6 | handled by the input subsystem and the led class is *not* needed. |
| 6 | 7 | ||
| 7 | In its simplest form, the LED class just allows control of LEDs from | 8 | In its simplest form, the LED class just allows control of LEDs from |
| 8 | userspace. LEDs appear in /sys/class/leds/. The brightness file will | 9 | userspace. LEDs appear in /sys/class/leds/. The maximum brightness of the |
| 9 | set the brightness of the LED (taking a value 0-255). Most LEDs don't | 10 | LED is defined in max_brightness file. The brightness file will set the brightness |
| 10 | have hardware brightness support so will just be turned on for non-zero | 11 | of the LED (taking a value 0-max_brightness). Most LEDs don't have hardware |
| 11 | brightness settings. | 12 | brightness support so will just be turned on for non-zero brightness settings. |
| 12 | 13 | ||
| 13 | The class also introduces the optional concept of an LED trigger. A trigger | 14 | The class also introduces the optional concept of an LED trigger. A trigger |
| 14 | is a kernel based source of led events. Triggers can either be simple or | 15 | is a kernel based source of led events. Triggers can either be simple or |