blob: 7a4144ba3afd41a070ab340cab472dfe50f19978 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Eric W. Biedermanff319772005-07-26 11:47:32 -060012#include <linux/reboot.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
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(void *dummy)
20{
Eric W. Biedermanff319772005-07-26 11:47:32 -060021 kernel_power_off();
Linus Torvalds1da177e2005-04-16 15:20:36 -070022}
23
24static DECLARE_WORK(poweroff_work, do_poweroff, NULL);
25
26static void handle_poweroff(int key, struct pt_regs *pt_regs,
27 struct tty_struct *tty)
28{
29 schedule_work(&poweroff_work);
30}
31
32static struct sysrq_key_op sysrq_poweroff_op = {
33 .handler = handle_poweroff,
34 .help_msg = "powerOff",
35 .action_msg = "Power Off",
36 .enable_mask = SYSRQ_ENABLE_BOOT,
37};
38
39static int pm_sysrq_init(void)
40{
41 register_sysrq_key('o', &sysrq_poweroff_op);
42 return 0;
43}
44
45subsys_initcall(pm_sysrq_init);