1// SPDX-License-Identifier: GPL-2.0
2//
3// Audio Mute LED trigger
4//
5
6#include <linux/kernel.h>
7#include <linux/leds.h>
8#include <linux/module.h>
9#include "../leds.h"
10
11static enum led_brightness audio_state[NUM_AUDIO_LEDS];
12
13static int ledtrig_audio_mute_activate(struct led_classdev *led_cdev)
14{
15 led_set_brightness_nosleep(led_cdev, value: audio_state[LED_AUDIO_MUTE]);
16 return 0;
17}
18
19static int ledtrig_audio_micmute_activate(struct led_classdev *led_cdev)
20{
21 led_set_brightness_nosleep(led_cdev, value: audio_state[LED_AUDIO_MICMUTE]);
22 return 0;
23}
24
25static struct led_trigger ledtrig_audio[NUM_AUDIO_LEDS] = {
26 [LED_AUDIO_MUTE] = {
27 .name = "audio-mute",
28 .activate = ledtrig_audio_mute_activate,
29 },
30 [LED_AUDIO_MICMUTE] = {
31 .name = "audio-micmute",
32 .activate = ledtrig_audio_micmute_activate,
33 },
34};
35
36enum led_brightness ledtrig_audio_get(enum led_audio type)
37{
38 return audio_state[type];
39}
40EXPORT_SYMBOL_GPL(ledtrig_audio_get);
41
42void ledtrig_audio_set(enum led_audio type, enum led_brightness state)
43{
44 audio_state[type] = state;
45 led_trigger_event(trigger: &ledtrig_audio[type], event: state);
46}
47EXPORT_SYMBOL_GPL(ledtrig_audio_set);
48
49static int __init ledtrig_audio_init(void)
50{
51 led_trigger_register(trigger: &ledtrig_audio[LED_AUDIO_MUTE]);
52 led_trigger_register(trigger: &ledtrig_audio[LED_AUDIO_MICMUTE]);
53 return 0;
54}
55module_init(ledtrig_audio_init);
56
57static void __exit ledtrig_audio_exit(void)
58{
59 led_trigger_unregister(trigger: &ledtrig_audio[LED_AUDIO_MUTE]);
60 led_trigger_unregister(trigger: &ledtrig_audio[LED_AUDIO_MICMUTE]);
61}
62module_exit(ledtrig_audio_exit);
63
64MODULE_DESCRIPTION("LED trigger for audio mute control");
65MODULE_LICENSE("GPL v2");
66MODULE_ALIAS("ledtrig:audio-mute");
67MODULE_ALIAS("ledtrig:audio-micmute");
68

source code of linux/drivers/leds/trigger/ledtrig-audio.c