| 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 | |
| 20 | static void do_poweroff(struct work_struct *dummy) |
| 21 | { |
| 22 | kernel_power_off(); |
| 23 | } |
| 24 | |
| 25 | static DECLARE_WORK(poweroff_work, do_poweroff); |
| 26 | |
| 27 | static void handle_poweroff(int key, struct tty_struct *tty) |
| 28 | { |
| 29 | /* run sysrq poweroff on boot cpu */ |
| 30 | schedule_work_on(first_cpu(cpu_online_map), &poweroff_work); |
| 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); |