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Message-Id: <1431479714-25846-1-git-send-email-toshik@chromium.org> Date: Tue, 12 May 2015 18:15:14 -0700 From: Toshi Kikuchi <toshik@...omium.org> To: linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org, milo.kim@...com, cooloney@...il.com, j.anaszewski@...sung.com Subject: [PATCH] Documentation: leds-lp5523: describe master fader attributes Add the usage of the new attributes for master faders. Signed-off-by: Toshi Kikuchi <toshik@...omium.org> --- Documentation/leds/leds-lp5523.txt | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/Documentation/leds/leds-lp5523.txt b/Documentation/leds/leds-lp5523.txt index 5b3e91d..0dbbd27 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. -- 2.2.1.62.g3f15098 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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