leds/trigger/ledtrig-audio.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 //
0003 // Audio Mute LED trigger
0004 //
0005
0006 #include <linux/kernel.h>
0007 #include <linux/leds.h>
0008 #include <linux/module.h>
0009 #include "../leds.h"
0010
0011 static enum led_brightness audio_state[NUM_AUDIO_LEDS];
0012
0013 static int ledtrig_audio_mute_activate(struct led_classdev *led_cdev)
0014 {
0015     led_set_brightness_nosleep(led_cdev, audio_state[LED_AUDIO_MUTE]);
0016     return 0;
0017 }
0018
0019 static int ledtrig_audio_micmute_activate(struct led_classdev *led_cdev)
0020 {
0021     led_set_brightness_nosleep(led_cdev, audio_state[LED_AUDIO_MICMUTE]);
0022     return 0;
0023 }
0024
0025 static struct led_trigger ledtrig_audio[NUM_AUDIO_LEDS] = {
0026     [LED_AUDIO_MUTE] = {
0027         .name     = "audio-mute",
0028         .activate = ledtrig_audio_mute_activate,
0029     },
0030     [LED_AUDIO_MICMUTE] = {
0031         .name     = "audio-micmute",
0032         .activate = ledtrig_audio_micmute_activate,
0033     },
0034 };
0035
0036 enum led_brightness ledtrig_audio_get(enum led_audio type)
0037 {
0038     return audio_state[type];
0039 }
0040 EXPORT_SYMBOL_GPL(ledtrig_audio_get);
0041
0042 void ledtrig_audio_set(enum led_audio type, enum led_brightness state)
0043 {
0044     audio_state[type] = state;
0045     led_trigger_event(&ledtrig_audio[type], state);
0046 }
0047 EXPORT_SYMBOL_GPL(ledtrig_audio_set);
0048
0049 static int __init ledtrig_audio_init(void)
0050 {
0051     led_trigger_register(&ledtrig_audio[LED_AUDIO_MUTE]);
0052     led_trigger_register(&ledtrig_audio[LED_AUDIO_MICMUTE]);
0053     return 0;
0054 }
0055 module_init(ledtrig_audio_init);
0056
0057 static void __exit ledtrig_audio_exit(void)
0058 {
0059     led_trigger_unregister(&ledtrig_audio[LED_AUDIO_MUTE]);
0060     led_trigger_unregister(&ledtrig_audio[LED_AUDIO_MICMUTE]);
0061 }
0062 module_exit(ledtrig_audio_exit);
0063
0064 MODULE_DESCRIPTION("LED trigger for audio mute control");
0065 MODULE_LICENSE("GPL v2");