drivers/leds/ledtrig-ide-disk.c

   1 /*
   2  * LED IDE-Disk Activity Trigger
   3  *
   4  * Copyright 2006 Openedhand Ltd.
   5  *
   6  * Author: Richard Purdie <rpurdie@openedhand.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/timer.h>
  18 #include <linux/leds.h>
  19
  20 static void ledtrig_ide_timerfunc(unsigned long data);
  21
  22 DEFINE_LED_TRIGGER(ledtrig_ide);
  23 static DEFINE_TIMER(ledtrig_ide_timer, ledtrig_ide_timerfunc, 0, 0);
  24 static int ide_activity;
  25 static int ide_lastactivity;
  26
  27 void ledtrig_ide_activity(void)
  28 {
  29         ide_activity++;
  30         if (!timer_pending(&ledtrig_ide_timer))
  31                 mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
  32 }
  33 EXPORT_SYMBOL(ledtrig_ide_activity);
  34
  35 static void ledtrig_ide_timerfunc(unsigned long data)
  36 {
  37         if (ide_lastactivity != ide_activity) {
  38                 ide_lastactivity = ide_activity;
  39                 led_trigger_event(ledtrig_ide, LED_FULL);
  40                 mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
  41         } else {
  42                 led_trigger_event(ledtrig_ide, LED_OFF);
  43         }
  44 }
  45
  46 static int __init ledtrig_ide_init(void)
  47 {
  48         led_trigger_register_simple("ide-disk", &ledtrig_ide);
  49         return 0;
  50 }
  51
  52 static void __exit ledtrig_ide_exit(void)
  53 {
  54         led_trigger_unregister_simple(ledtrig_ide);
  55 }
  56
  57 module_init(ledtrig_ide_init);
  58 module_exit(ledtrig_ide_exit);
  59
  60 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
  61 MODULE_DESCRIPTION("LED IDE Disk Activity Trigger");
  62 MODULE_LICENSE("GPL");