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faa2541f5b
This patch adds a new LED trigger for coupling the audio mixer change with the LED on laptops or other devices. Currently there are two trigger types, "audio-mute" and "audio-micmute". The audio driver triggers the LED brightness change via ledtrig_audio_set() call with the proper type (either mute or mic-mute). OTOH, the consumers may call ledtrig_audio_get() for the initial brightness value that may have been set by the audio driver beforehand. This new stuff will be used by HD-audio codec driver and some platform drivers (thinkpad_acpi and dell-laptop, also upcoming huawei-wmi). Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Acked-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Audio Mute LED trigger
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//
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#include <linux/kernel.h>
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#include <linux/leds.h>
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#include <linux/module.h>
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static struct led_trigger *ledtrig_audio[NUM_AUDIO_LEDS];
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static enum led_brightness audio_state[NUM_AUDIO_LEDS];
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enum led_brightness ledtrig_audio_get(enum led_audio type)
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{
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return audio_state[type];
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}
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EXPORT_SYMBOL_GPL(ledtrig_audio_get);
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void ledtrig_audio_set(enum led_audio type, enum led_brightness state)
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{
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audio_state[type] = state;
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led_trigger_event(ledtrig_audio[type], state);
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}
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EXPORT_SYMBOL_GPL(ledtrig_audio_set);
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static int __init ledtrig_audio_init(void)
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{
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led_trigger_register_simple("audio-mute",
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&ledtrig_audio[LED_AUDIO_MUTE]);
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led_trigger_register_simple("audio-micmute",
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&ledtrig_audio[LED_AUDIO_MICMUTE]);
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return 0;
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}
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module_init(ledtrig_audio_init);
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static void __exit ledtrig_audio_exit(void)
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{
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led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MUTE]);
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led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MICMUTE]);
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}
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module_exit(ledtrig_audio_exit);
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MODULE_DESCRIPTION("LED trigger for audio mute control");
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MODULE_LICENSE("GPL v2");
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