drivers/leds/trigger/ledtrig-audio.c

   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
  10 static struct led_trigger *ledtrig_audio[NUM_AUDIO_LEDS];
  11 static enum led_brightness audio_state[NUM_AUDIO_LEDS];
  12
  13 enum led_brightness ledtrig_audio_get(enum led_audio type)
  14 {
  15         return audio_state[type];
  16 }
  17 EXPORT_SYMBOL_GPL(ledtrig_audio_get);
  18
  19 void ledtrig_audio_set(enum led_audio type, enum led_brightness state)
  20 {
  21         audio_state[type] = state;
  22         led_trigger_event(ledtrig_audio[type], state);
  23 }
  24 EXPORT_SYMBOL_GPL(ledtrig_audio_set);
  25
  26 static int __init ledtrig_audio_init(void)
  27 {
  28         led_trigger_register_simple("audio-mute",
  29                                     &ledtrig_audio[LED_AUDIO_MUTE]);
  30         led_trigger_register_simple("audio-micmute",
  31                                     &ledtrig_audio[LED_AUDIO_MICMUTE]);
  32         return 0;
  33 }
  34 module_init(ledtrig_audio_init);
  35
  36 static void __exit ledtrig_audio_exit(void)
  37 {
  38         led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MUTE]);
  39         led_trigger_unregister_simple(ledtrig_audio[LED_AUDIO_MICMUTE]);
  40 }
  41 module_exit(ledtrig_audio_exit);
  42
  43 MODULE_DESCRIPTION("LED trigger for audio mute control");
  44 MODULE_LICENSE("GPL v2");