linux-kernel - Re: [PATCH] thinkpad_acpi: Add support for keyboard backlight

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Message-Id: <201601042140.02085@pali>
Date:	Mon, 4 Jan 2016 21:40:01 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	Darren Hart <dvhart@...radead.org>,
	ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Fabio D'Urso" <fabiodurso@...mail.it>
Subject: Re: [PATCH] thinkpad_acpi: Add support for keyboard backlight

On Monday 04 January 2016 21:23:52 Pali Rohár wrote:
> Looks like userspace already uses /sys/class/leds/*::kbd_backlight
> for keyboard backlight (light under the keyboard). At least other
> drivers uses this name and my KDE desktop recognized
> "dell::kbd_backlight" (from dell-laptop.ko) and
> "tpacpi::kbd_backlight" too.
> 
> So really for keyboard backlight use *::kbd_backlight it is already
> handled by existing userspace applications.

upower is one of tool used on linux desktops. See this source code:

http://cgit.freedesktop.org/upower/tree/src/up-kbd-backlight.c

It has function up_kbd_backlight_find() which do:

	/* find a led device that is a keyboard device */
	while ((filename = g_dir_read_name (dir)) != NULL) {
		if (g_strstr_len (filename, -1, "kbd_backlight") != NULL) {
			dir_path = g_build_filename ("/sys/class/leds",
						    filename, NULL);
			break;
		}
	}

-- 
Pali Rohár
pali.rohar@...il.com

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