drivers/leds/trigger/ledtrig-disk.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * LED Disk Activity Trigger
   4  *
   5  * Copyright 2006 Openedhand Ltd.
   6  *
   7  * Author: Richard Purdie <rpurdie@openedhand.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/leds.h>
  13
  14 #define BLINK_DELAY 30
  15
  16 DEFINE_LED_TRIGGER(ledtrig_disk);
  17 DEFINE_LED_TRIGGER(ledtrig_disk_read);
  18 DEFINE_LED_TRIGGER(ledtrig_disk_write);
  19
  20 void ledtrig_disk_activity(bool write)
  21 {
  22         led_trigger_blink_oneshot(ledtrig_disk, BLINK_DELAY, BLINK_DELAY, 0);
  23         if (write)
  24                 led_trigger_blink_oneshot(ledtrig_disk_write,
  25                                           BLINK_DELAY, BLINK_DELAY, 0);
  26         else
  27                 led_trigger_blink_oneshot(ledtrig_disk_read,
  28                                           BLINK_DELAY, BLINK_DELAY, 0);
  29 }
  30 EXPORT_SYMBOL(ledtrig_disk_activity);
  31
  32 static int __init ledtrig_disk_init(void)
  33 {
  34         led_trigger_register_simple("disk-activity", &ledtrig_disk);
  35         led_trigger_register_simple("disk-read", &ledtrig_disk_read);
  36         led_trigger_register_simple("disk-write", &ledtrig_disk_write);
  37
  38         return 0;
  39 }
  40 device_initcall(ledtrig_disk_init);