drivers/leds/trigger/ledtrig-camera.c

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