poweroff.c
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/*
* poweroff.c - sysrq handler to gracefully power down machine.
*
* This file is released under the GPL v2
*/
#include <linux/kernel.h>
#include <linux/sysrq.h>
#include <linux/init.h>
#include <linux/pm.h>
#include <linux/workqueue.h>
#include <linux/reboot.h>
/*
* When the user hits Sys-Rq o to power down the machine this is the
* callback we use.
*/
static void do_poweroff(void *dummy)
{
kernel_power_off();
}
static DECLARE_WORK(poweroff_work, do_poweroff, NULL);
static void handle_poweroff(int key, struct pt_regs *pt_regs,
struct tty_struct *tty)
{
schedule_work(&poweroff_work);
}
static struct sysrq_key_op sysrq_poweroff_op = {
.handler = handle_poweroff,
.help_msg = "powerOff",
.action_msg = "Power Off",
.enable_mask = SYSRQ_ENABLE_BOOT,
};
static int pm_sysrq_init(void)
{
register_sysrq_key('o', &sysrq_poweroff_op);
return 0;
}
subsys_initcall(pm_sysrq_init);