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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
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

7
drivers/leds/trigger/Kconfig
View file

@ -136,4 +136,11 @@ config LEDS_TRIGGER_PATTERN
which is a series of tuples, of brightness and duration (ms).
If unsure, say N
config LEDS_TRIGGER_AUDIO
tristate "Audio Mute LED Trigger"
help
This allows LEDs to be controlled by audio drivers for following
the audio mute and mic-mute changes.
If unsure, say N
endif # LEDS_TRIGGERS

1
drivers/leds/trigger/Makefile
View file

@ -14,3 +14,4 @@ obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o
obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o
obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
obj-$(CONFIG_LEDS_TRIGGER_PATTERN) += ledtrig-pattern.o
obj-$(CONFIG_LEDS_TRIGGER_AUDIO) += ledtrig-audio.o

44
drivers/leds/trigger/ledtrig-audio.c Normal file
View file

@ -0,0 +1,44 @@
// SPDX-License-Identifier: GPL-2.0
//
// Audio Mute LED trigger
//
#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/module.h>
static struct led_trigger *ledtrig_audio[NUM_AUDIO_LEDS];
static enum led_brightness audio_state[NUM_AUDIO_LEDS];
enum led_brightness ledtrig_audio_get(enum led_audio type)
{
return audio_state[type];
}
EXPORT_SYMBOL_GPL(ledtrig_audio_get);
void ledtrig_audio_set(enum led_audio type, enum led_brightness state)
{
audio_state[type] = state;
led_trigger_event(ledtrig_audio[type], state);
}
EXPORT_SYMBOL_GPL(ledtrig_audio_set);
static int __init ledtrig_audio_init(void)
{
led_trigger_register_simple("audio-mute",
&ledtrig_audio[LED_AUDIO_MUTE]);
led_trigger_register_simple("audio-micmute",
&ledtrig_audio[LED_AUDIO_MICMUTE]);
return 0;
}
module_init(ledtrig_audio_init);
static void __exit ledtrig_audio_exit(void)
{
led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MUTE]);
led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MICMUTE]);
}
module_exit(ledtrig_audio_exit);
MODULE_DESCRIPTION("LED trigger for audio mute control");
MODULE_LICENSE("GPL v2");

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 */