2 * poweroff.c - sysrq handler to gracefully power down machine.
4 * This file is released under the GPL v2
7 #include <linux/kernel.h>
8 #include <linux/sysrq.h>
9 #include <linux/init.h>
11 #include <linux/workqueue.h>
12 #include <linux/reboot.h>
13 #include <linux/cpumask.h>
16 * When the user hits Sys-Rq o to power down the machine this is the
20 static void do_poweroff(struct work_struct *dummy)
25 static DECLARE_WORK(poweroff_work, do_poweroff);
27 static void handle_poweroff(int key, struct tty_struct *tty)
29 /* run sysrq poweroff on boot cpu */
30 schedule_work_on(first_cpu(cpu_online_map), &poweroff_work);
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,
40 static int pm_sysrq_init(void)
42 register_sysrq_key('o', &sysrq_poweroff_op);
46 subsys_initcall(pm_sysrq_init);