1/*
2 * poweroff.c - sysrq handler to gracefully power down machine.
3 *
4 * This file is released under the GPL v2
5 */
6
7#include <linux/kernel.h>
8#include <linux/sysrq.h>
9#include <linux/init.h>
10#include <linux/pm.h>
11#include <linux/workqueue.h>
12#include <linux/reboot.h>
13
14/*
15 * When the user hits Sys-Rq o to power down the machine this is the
16 * callback we use.
17 */
18
19static void do_poweroff(struct work_struct *dummy)
20{
21	kernel_power_off();
22}
23
24static DECLARE_WORK(poweroff_work, do_poweroff);
25
26static void handle_poweroff(int key, struct tty_struct *tty)
27{
28	schedule_work(&poweroff_work);
29}
30
31static struct sysrq_key_op	sysrq_poweroff_op = {
32	.handler        = handle_poweroff,
33	.help_msg       = "powerOff",
34	.action_msg     = "Power Off",
35 	.enable_mask	= SYSRQ_ENABLE_BOOT,
36};
37
38static int pm_sysrq_init(void)
39{
40	register_sysrq_key('o', &sysrq_poweroff_op);
41	return 0;
42}
43
44subsys_initcall(pm_sysrq_init);
45