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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2015-03-17 07:19:56 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2015-06-12 04:18:11 +0300
commitf60c8ba77dcea80af8facfd786a0d2c3ace86f3d (patch)
tree4dc115384ea35ba027b7514ca5e6f5fd388daf61 /Documentation/leds/leds-class.txt
parentcf99289d67688c4f92175da42bd1647695f6fddc (diff)
downloadlinux-f60c8ba77dcea80af8facfd786a0d2c3ace86f3d.tar.xz
Input: export LEDs as class devices in sysfs
This change creates a new input handler called "leds" that exports LEDs on input devices as standard LED class devices in sysfs and allows controlling their state via sysfs or via any of the standard LED triggers. This allows to re-purpose and reassign LDEs on the keyboards to represent states other than the standard keyboard states (CapsLock, NumLock, etc). The old API of controlling input LEDs by writing into /dev/input/eventX devices is still present and will take precedence over accessing via LEDs subsystem (i.e. it may override state set by a trigger). If input device is "grabbed" then requests coming through LED subsystem will be ignored. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Tested-by: Pavel Machek <pavel@ucw.cz> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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LED handling under Linux
========================
-If you're reading this and thinking about keyboard leds, these are
-handled by the input subsystem and the led class is *not* needed.
-
In its simplest form, the LED class just allows control of LEDs from
userspace. LEDs appear in /sys/class/leds/. The maximum brightness of the
LED is defined in max_brightness file. The brightness file will set the brightness