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
);