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Commit 6cff8d60 authored by Gabriele Mazzotta's avatar Gabriele Mazzotta Committed by Darren Hart
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platform: x86: dell-laptop: Add support for keyboard backlight 



This patch adds the support for the configuration of the keyboard
backlight on supported Dell laptops.

With this patch it is possible to set:
* keyboard backlight level
* timeout after which the backlight will be automatically turned off
* input activity triggers (keyboard, touchpad, mouse) that enable the backlight
* ambient light settings

The settings are exposed via /sys/class/leds/dell::kbd_backlight/

The code is based on the newly released documentation by Dell in the
libsmbios project.

Signed-off-by: default avatarPali Rohár <pali.rohar@gmail.com>
Signed-off-by: default avatarGabriele Mazzotta <gabriele.mzt@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarDarren Hart <dvhart@linux.intel.com>
parent 9659bee4

Documentation/ABI/testing/sysfs-platform-dell-laptop

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What:		/sys/class/leds/dell::kbd_backlight/als_enabled

Date:		December 2014

KernelVersion:	3.19

Contact:	Gabriele Mazzotta <gabriele.mzt@gmail.com>,

		Pali Rohár <pali.rohar@gmail.com>

Description:

		This file allows to control the automatic keyboard

		illumination mode on some systems that have an ambient

		light sensor. Write 1 to this file to enable the auto

		mode, 0 to disable it.



What:		/sys/class/leds/dell::kbd_backlight/als_setting

Date:		December 2014

KernelVersion:	3.19

Contact:	Gabriele Mazzotta <gabriele.mzt@gmail.com>,

		Pali Rohár <pali.rohar@gmail.com>

Description:

		This file allows to specifiy the on/off threshold value,

		as reported by the ambient light sensor.



What:		/sys/class/leds/dell::kbd_backlight/start_triggers

Date:		December 2014

KernelVersion:	3.19

Contact:	Gabriele Mazzotta <gabriele.mzt@gmail.com>,

		Pali Rohár <pali.rohar@gmail.com>

Description:

		This file allows to control the input triggers that

		turn on the keyboard backlight illumination that is

		disabled because of inactivity.

		Read the file to see the triggers available. The ones

		enabled are preceded by '+', those disabled by '-'.



		To enable a trigger, write its name preceded by '+' to

		this file. To disable a trigger, write its name preceded

		by '-' instead.



		For example, to enable the keyboard as trigger run:

		    echo +keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers

		To disable it:

		    echo -keyboard > /sys/class/leds/dell::kbd_backlight/start_triggers



		Note that not all the available triggers can be configured.



What:		/sys/class/leds/dell::kbd_backlight/stop_timeout

Date:		December 2014

KernelVersion:	3.19

Contact:	Gabriele Mazzotta <gabriele.mzt@gmail.com>,

		Pali Rohár <pali.rohar@gmail.com>

Description:

		This file allows to specify the interval after which the

		keyboard illumination is disabled because of inactivity.

		The timeouts are expressed in seconds, minutes, hours and

		days, for which the symbols are 's', 'm', 'h' and 'd'

		respectively.



		To configure the timeout, write to this file a value along

		with any the above units. If no unit is specified, the value

		is assumed to be expressed in seconds.



		For example, to set the timeout to 10 minutes run:

		    echo 10m > /sys/class/leds/dell::kbd_backlight/stop_timeout



		Note that when this file is read, the returned value might be

		expressed in a different unit than the one used when the timeout

		was set.



		Also note that only some timeouts are supported and that

		some systems might fall back to a specific timeout in case

		an invalid timeout is written to this file.

drivers/platform/x86/dell-laptop.c

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