Root/kernel/power/poweroff.c

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#include <linux/cpumask.h>
14
15/*
16 * When the user hits Sys-Rq o to power down the machine this is the
17 * callback we use.
18 */
19
20static void do_poweroff(struct work_struct *dummy)
21{
22    kernel_power_off();
23}
24
25static DECLARE_WORK(poweroff_work, do_poweroff);
26
27static void handle_poweroff(int key)
28{
29    /* run sysrq poweroff on boot cpu */
30    schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work);
31}
32
33static struct sysrq_key_op sysrq_poweroff_op = {
34    .handler = handle_poweroff,
35    .help_msg = "powerOff",
36    .action_msg = "Power Off",
37    .enable_mask = SYSRQ_ENABLE_BOOT,
38};
39
40static int pm_sysrq_init(void)
41{
42    register_sysrq_key('o', &sysrq_poweroff_op);
43    return 0;
44}
45
46subsys_initcall(pm_sysrq_init);
47

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