drivers/leds/trigger/ledtrig-camera.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Camera Flash and Torch On/Off Trigger
   4  *
   5  * based on ledtrig-ide-disk.c
   6  *
   7  * Copyright 2013 Texas Instruments
   8  *
   9  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/leds.h>
  16
  17 DEFINE_LED_TRIGGER(ledtrig_flash);
  18 DEFINE_LED_TRIGGER(ledtrig_torch);
  19
  20 void ledtrig_flash_ctrl(bool on)
  21 {
  22         enum led_brightness brt = on ? LED_FULL : LED_OFF;
  23
  24         led_trigger_event(ledtrig_flash, brt);
  25 }
  26 EXPORT_SYMBOL_GPL(ledtrig_flash_ctrl);
  27
  28 void ledtrig_torch_ctrl(bool on)
  29 {
  30         enum led_brightness brt = on ? LED_FULL : LED_OFF;
  31
  32         led_trigger_event(ledtrig_torch, brt);
  33 }
  34 EXPORT_SYMBOL_GPL(ledtrig_torch_ctrl);
  35
  36 static int __init ledtrig_camera_init(void)
  37 {
  38         led_trigger_register_simple("flash", &ledtrig_flash);
  39         led_trigger_register_simple("torch", &ledtrig_torch);
  40         return 0;
  41 }
  42 module_init(ledtrig_camera_init);
  43
  44 static void __exit ledtrig_camera_exit(void)
  45 {
  46         led_trigger_unregister_simple(ledtrig_torch);
  47         led_trigger_unregister_simple(ledtrig_flash);
  48 }
  49 module_exit(ledtrig_camera_exit);
  50
  51 MODULE_DESCRIPTION("LED Trigger for Camera Flash/Torch Control");
  52 MODULE_AUTHOR("Milo Kim");
  53 MODULE_LICENSE("GPL v2");