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| author | Németh Márton <nm127@freemail.hu> | 2008-03-09 20:54:37 +0000 |
|---|---|---|
| committer | Richard Purdie <rpurdie@rpsys.net> | 2008-04-24 23:34:18 +0100 |
| commit | 0013b23d66a2768f5babbb0ea9f03ab067a990d8 (patch) | |
| tree | 14d60a50bb68e422767a268cd737f70ef4e6e19d /Documentation/leds-class.txt | |
| parent | b3ba31f84ea041c0945b5904d4c407ce14b2b72c (diff) | |
| download | lwn-0013b23d66a2768f5babbb0ea9f03ab067a990d8.tar.gz lwn-0013b23d66a2768f5babbb0ea9f03ab067a990d8.zip | |
leds: disable triggers on brightness set
Disable any active triggers when the brightness attribute is
set to zero.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Diffstat (limited to 'Documentation/leds-class.txt')
| -rw-r--r-- | Documentation/leds-class.txt | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Documentation/leds-class.txt b/Documentation/leds-class.txt index 56757c751d6f..18860ad9935a 100644 --- a/Documentation/leds-class.txt +++ b/Documentation/leds-class.txt @@ -19,6 +19,12 @@ optimises away. Complex triggers whilst available to all LEDs have LED specific parameters and work on a per LED basis. The timer trigger is an example. +The timer trigger will periodically change the LED brightness between +LED_OFF and the current brightness setting. The "on" and "off" time can +be specified via /sys/class/leds/<device>/delay_{on,off} in milliseconds. +You can change the brightness value of a LED independently of the timer +trigger. However, if you set the brightness value to LED_OFF it will +also disable the timer trigger. You can change triggers in a similar manner to the way an IO scheduler is chosen (via /sys/class/leds/<device>/trigger). Trigger specific @@ -63,9 +69,9 @@ value if it is called with *delay_on==0 && *delay_off==0 parameters. In this case the driver should give back the chosen value through delay_on and delay_off parameters to the leds subsystem. -Any call to the brightness_set() callback function should cancel the -previously programmed hardware blinking function so setting the brightness -to 0 can also cancel the blinking of the LED. +Setting the brightness to zero with brightness_set() callback function +should completely turn off the LED and cancel the previously programmed +hardware blinking function, if any. Known Issues |