Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
ff319777 | 12 | #include <linux/reboot.h> |
2f15fc4b | 13 | #include <linux/cpumask.h> |
1da177e4 LT |
14 | |
15 | /* | |
16 | * When the user hits Sys-Rq o to power down the machine this is the | |
17 | * callback we use. | |
18 | */ | |
19 | ||
65f27f38 | 20 | static void do_poweroff(struct work_struct *dummy) |
1da177e4 | 21 | { |
ff319777 | 22 | kernel_power_off(); |
1da177e4 LT |
23 | } |
24 | ||
65f27f38 | 25 | static DECLARE_WORK(poweroff_work, do_poweroff); |
1da177e4 | 26 | |
7d12e780 | 27 | static void handle_poweroff(int key, struct tty_struct *tty) |
1da177e4 | 28 | { |
2f15fc4b | 29 | /* run sysrq poweroff on boot cpu */ |
41c7bb95 | 30 | schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work); |
1da177e4 LT |
31 | } |
32 | ||
33 | static 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 | ||
40 | static int pm_sysrq_init(void) | |
41 | { | |
42 | register_sysrq_key('o', &sysrq_poweroff_op); | |
43 | return 0; | |
44 | } | |
45 | ||
46 | subsys_initcall(pm_sysrq_init); |