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UPSTREAM: leds: multicolor: Introduce a multicolor class definition

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Introduce a multicolor class that groups colored LEDs
within a LED node.

The multicolor class groups monochrome LEDs and allows controlling two
aspects of the final combined color: hue and lightness. The former is
controlled via the intensity file and the latter is controlled
via brightness file.

Signed-off-by: Dan Murphy <[email protected]>
Acked-by: Jacek Anaszewski <[email protected]>
Signed-off-by: Pavel Machek <[email protected]>
[squashed leds: multicolor: Fix camel case in documentation in]

Bug: 260685629
(cherry picked from commit 55d5d3b46b08a4dc0b05343d24640744e7430ed7)
Change-Id: Ib1f41d74ace8e3a9c1071d52202c8d8b70a912e0
Signed-off-by: Farid Chahla <[email protected]>
This commit is contained in:
Dan Murphy 2020-07-16 13:19:56 -05:00 • committed by Treehugger Robot
commit 3e667a0854
7 changed files with 457 additions and 0 deletions
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35
Documentation/ABI/testing/sysfs-class-led-multicolor Normal file
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What: /sys/class/leds/<led>/brightness
Date: March 2020
KernelVersion: 5.9
Contact: Dan Murphy <[email protected]>
Description: read/write
Writing to this file will update all LEDs within the group to a
calculated percentage of what each color LED intensity is set
to. The percentage is calculated for each grouped LED via the
equation below:
led_brightness = brightness * multi_intensity/max_brightness
For additional details please refer to
Documentation/leds/leds-class-multicolor.rst.
The value of the LED is from 0 to
/sys/class/leds/<led>/max_brightness.
What: /sys/class/leds/<led>/multi_index
Date: March 2020
KernelVersion: 5.9
Contact: Dan Murphy <[email protected]>
Description: read
The multi_index array, when read, will output the LED colors
as an array of strings as they are indexed in the
multi_intensity file.
What: /sys/class/leds/<led>/multi_intensity
Date: March 2020
KernelVersion: 5.9
Contact: Dan Murphy <[email protected]>
Description: read/write
This file contains array of integers. Order of components is
described by the multi_index array. The maximum intensity should
not exceed /sys/class/leds/<led>/max_brightness.