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leds: trigger: Introduce audio mute LED trigger

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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>
This commit is contained in:
Takashi Iwai 2018-11-26 17:47:44 +01:00
parent 9ff01193a2
commit faa2541f5b
4 changed files with 72 additions and 0 deletions
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20
include/linux/leds.h
View file

@ -487,4 +487,24 @@ struct led_pattern {
int brightness;
};
enum led_audio {
LED_AUDIO_MUTE, /* master mute LED */
LED_AUDIO_MICMUTE, /* mic mute LED */
NUM_AUDIO_LEDS
};
#if IS_ENABLED(CONFIG_LEDS_TRIGGER_AUDIO)
enum led_brightness ledtrig_audio_get(enum led_audio type);
void ledtrig_audio_set(enum led_audio type, enum led_brightness state);
#else
static inline enum led_brightness ledtrig_audio_get(enum led_audio type)
{
return LED_OFF;
}
static inline void ledtrig_audio_set(enum led_audio type,
enum led_brightness state)
{
}
#endif
#endif /* __LINUX_LEDS_H_INCLUDED */