LXR linux/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/jiffies.h>
  16#include <linux/kernel.h>
  17#include <linux/init.h>
  18#include <linux/timer.h>
  19#include <linux/leds.h>
  20
  21static void ledtrig_ide_timerfunc(unsigned long data);
  22
  23DEFINE_LED_TRIGGER(ledtrig_ide);
  24static DEFINE_TIMER(ledtrig_ide_timer, ledtrig_ide_timerfunc, 0, 0);
  25static int ide_activity;
  26static int ide_lastactivity;
  27
  28void ledtrig_ide_activity(void)
  29{
  30        ide_activity++;
  31        if (!timer_pending(&ledtrig_ide_timer))
  32                mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
  33}
  34EXPORT_SYMBOL(ledtrig_ide_activity);
  35
  36static void ledtrig_ide_timerfunc(unsigned long data)
  37{
  38        if (ide_lastactivity != ide_activity) {
  39                ide_lastactivity = ide_activity;
  40                /* INT_MAX will set each LED to its maximum brightness */
  41                led_trigger_event(ledtrig_ide, INT_MAX);
  42                mod_timer(&ledtrig_ide_timer, jiffies + msecs_to_jiffies(10));
  43        } else {
  44                led_trigger_event(ledtrig_ide, LED_OFF);
  45        }
  46}
  47
  48static int __init ledtrig_ide_init(void)
  49{
  50        led_trigger_register_simple("ide-disk", &ledtrig_ide);
  51        return 0;
  52}
  53
  54static void __exit ledtrig_ide_exit(void)
  55{
  56        led_trigger_unregister_simple(ledtrig_ide);
  57}
  58
  59module_init(ledtrig_ide_init);
  60module_exit(ledtrig_ide_exit);
  61
  62MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
  63MODULE_DESCRIPTION("LED IDE Disk Activity Trigger");
  64MODULE_LICENSE("GPL");
  65