From 7ff6b23251955dc1cf108eb4619b4a2eeac75bca Mon Sep 17 00:00:00 2001 From: Toshi Kikuchi Date: Tue, 12 May 2015 18:15:14 -0700 Subject: Documentation: leds-lp5523: describe master fader attributes Add the usage of the new attributes for master faders. Signed-off-by: Toshi Kikuchi Acked-by: Milo Kim Acked-by: Jacek Anaszewski Signed-off-by: Bryan Wu --- Documentation/leds/leds-lp5523.txt | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'Documentation/leds') diff --git a/Documentation/leds/leds-lp5523.txt b/Documentation/leds/leds-lp5523.txt index 5b3e91d4ac59..0dbbd279c9b9 100644 --- a/Documentation/leds/leds-lp5523.txt +++ b/Documentation/leds/leds-lp5523.txt @@ -49,6 +49,36 @@ There are two ways to run LED patterns. 2) Firmware interface - LP55xx common interface For the details, please refer to 'firmware' section in leds-lp55xx.txt +LP5523 has three master faders. If a channel is mapped to one of +the master faders, its output is dimmed based on the value of the master +fader. + +For example, + + echo "123000123" > master_fader_leds + +creates the following channel-fader mappings: + + channel 0,6 to master_fader1 + channel 1,7 to master_fader2 + channel 2,8 to master_fader3 + +Then, to have 25% of the original output on channel 0,6: + + echo 64 > master_fader1 + +To have 0% of the original output (i.e. no output) channel 1,7: + + echo 0 > master_fader2 + +To have 100% of the original output (i.e. no dimming) on channel 2,8: + + echo 255 > master_fader3 + +To clear all master fader controls: + + echo "000000000" > master_fader_leds + Selftest uses always the current from the platform data. Each channel contains led current settings. -- cgit