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 14/* 15 * When the user hits Sys-Rq o to power down the machine this is the 16 * callback we use. 17 */ 18 19static void do_poweroff(struct work_struct *dummy) 20{ 21 kernel_power_off(); 22} 23 24static DECLARE_WORK(poweroff_work, do_poweroff); 25 26static void handle_poweroff(int key, struct tty_struct *tty) 27{ 28 schedule_work(&poweroff_work); 29} 30 31static struct sysrq_key_op sysrq_poweroff_op = { 32 .handler = handle_poweroff, 33 .help_msg = "powerOff", 34 .action_msg = "Power Off", 35 .enable_mask = SYSRQ_ENABLE_BOOT, 36}; 37 38static int pm_sysrq_init(void) 39{ 40 register_sysrq_key('o', &sysrq_poweroff_op); 41 return 0; 42} 43 44subsys_initcall(pm_sysrq_init); 45