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
16DEFINE_LED_TRIGGER(ledtrig_disk);
17DEFINE_LED_TRIGGER(ledtrig_disk_read);
18DEFINE_LED_TRIGGER(ledtrig_disk_write);
19
20void ledtrig_disk_activity(bool write)
21{
22 led_trigger_blink_oneshot(trigger: ledtrig_disk, BLINK_DELAY, BLINK_DELAY, invert: 0);
23 if (write)
24 led_trigger_blink_oneshot(trigger: ledtrig_disk_write,
25 BLINK_DELAY, BLINK_DELAY, invert: 0);
26 else
27 led_trigger_blink_oneshot(trigger: ledtrig_disk_read,
28 BLINK_DELAY, BLINK_DELAY, invert: 0);
29}
30EXPORT_SYMBOL(ledtrig_disk_activity);
31
32static int __init ledtrig_disk_init(void)
33{
34 led_trigger_register_simple(name: "disk-activity", trigger: &ledtrig_disk);
35 led_trigger_register_simple(name: "disk-read", trigger: &ledtrig_disk_read);
36 led_trigger_register_simple(name: "disk-write", trigger: &ledtrig_disk_write);
37
38 return 0;
39}
40device_initcall(ledtrig_disk_init);
41

source code of linux/drivers/leds/trigger/ledtrig-disk.c