59 lines
1.6 KiB
Org Mode
59 lines
1.6 KiB
Org Mode
-*- org -*-
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It is somehow important to provide consistent interface to the
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userland. LED devices have one problem there, and that is naming of
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directories in /sys/class/leds. It would be nice if userland would
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just know right "name" for given LED function, but situation got more
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complex.
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Anyway, if backwards compatibility is not an issue, new code should
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use one of the "good" names from this list, and you should extend the
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list where applicable.
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Legacy names are listed, too; in case you are writing application that
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wants to use particular feature, you should probe for good name, first,
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but then try the legacy ones, too.
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Notice there's a list of functions in include/dt-bindings/leds/common.h .
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* Keyboards
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Good: "input*:*:capslock"
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Good: "input*:*:scrolllock"
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Good: "input*:*:numlock"
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Legacy: "shift-key-light" (Motorola Droid 4, capslock)
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Set of common keyboard LEDs, going back to PC AT or so.
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Legacy: "tpacpi::thinklight" (IBM/Lenovo Thinkpads)
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Legacy: "lp5523:kb{1,2,3,4,5,6}" (Nokia N900)
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Frontlight/backlight of main keyboard.
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Legacy: "button-backlight" (Motorola Droid 4)
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Some phones have touch buttons below screen; it is different from main
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keyboard. And this is their backlight.
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* Sound subsystem
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Good: "platform:*:mute"
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Good: "platform:*:micmute"
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LEDs on notebook body, indicating that sound input / output is muted.
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* System notification
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Legacy: "status-led:{red,green,blue}" (Motorola Droid 4)
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Legacy: "lp5523:{r,g,b}" (Nokia N900)
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Phones usually have multi-color status LED.
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* Power management
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Good: "platform:*:charging" (allwinner sun50i)
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* Screen
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Good: ":backlight" (Motorola Droid 4)
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