drivers/leds/trigger/ledtrig-disk.c

   1 /*
   2  * LED 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/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/leds.h>
  17
  18 #define BLINK_DELAY 30
  19
  20 DEFINE_LED_TRIGGER(ledtrig_disk);
  21 DEFINE_LED_TRIGGER(ledtrig_disk_read);
  22 DEFINE_LED_TRIGGER(ledtrig_disk_write);
  23 DEFINE_LED_TRIGGER(ledtrig_ide);
  24
  25 void ledtrig_disk_activity(bool write)
  26 {
  27         unsigned long blink_delay = BLINK_DELAY;
  28
  29         led_trigger_blink_oneshot(ledtrig_disk,
  30                                   &blink_delay, &blink_delay, 0);
  31         led_trigger_blink_oneshot(ledtrig_ide,
  32                                   &blink_delay, &blink_delay, 0);
  33         if (write)
  34                 led_trigger_blink_oneshot(ledtrig_disk_write,
  35                                           &blink_delay, &blink_delay, 0);
  36         else
  37                 led_trigger_blink_oneshot(ledtrig_disk_read,
  38                                           &blink_delay, &blink_delay, 0);
  39 }
  40 EXPORT_SYMBOL(ledtrig_disk_activity);
  41
  42 static int __init ledtrig_disk_init(void)
  43 {
  44         led_trigger_register_simple("disk-activity", &ledtrig_disk);
  45         led_trigger_register_simple("disk-read", &ledtrig_disk_read);
  46         led_trigger_register_simple("disk-write", &ledtrig_disk_write);
  47         led_trigger_register_simple("ide-disk", &ledtrig_ide);
  48
  49         return 0;
  50 }
  51 device_initcall(ledtrig_disk_init);