/* * 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(struct work_struct *dummy){	kernel_power_off();} static DECLARE_WORK(poweroff_work, do_poweroff); static void handle_poweroff(int key, 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);