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authorToshi Kikuchi <toshik@chromium.org>2015-05-13 04:15:14 +0300
committerBryan Wu <cooloney@gmail.com>2015-05-25 23:26:47 +0300
commit7ff6b23251955dc1cf108eb4619b4a2eeac75bca (patch)
tree445abaa5486aa9aa884221aaf1b00386db8c8b6e /Documentation
parent52da81eafaff1388b2df97b79d317c93a048899c (diff)
downloadlinux-7ff6b23251955dc1cf108eb4619b4a2eeac75bca.tar.xz
Documentation: leds-lp5523: describe master fader attributes
Add the usage of the new attributes for master faders. Signed-off-by: Toshi Kikuchi <toshik@chromium.org> Acked-by: Milo Kim <milo.kim@ti.com> Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/leds/leds-lp5523.txt30
1 files changed, 30 insertions, 0 deletions
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.