LXR linux-bk/kernel/power/poweroff.c

   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
  13/*
  14 * When the user hits Sys-Rq o to power down the machine this is the
  15 * callback we use.
  16 */
  17
  18static void do_poweroff(void *dummy)
  19{
  20        if (pm_power_off)
  21                pm_power_off();
  22}
  23
  24static DECLARE_WORK(poweroff_work, do_poweroff, NULL);
  25
  26static void handle_poweroff(int key, struct pt_regs *pt_regs,
  27                                struct tty_struct *tty)
  28{
  29        schedule_work(&poweroff_work);
  30}
  31
  32static struct sysrq_key_op      sysrq_poweroff_op = {
  33        .handler        = handle_poweroff,
  34        .help_msg       = "powerOff",
  35        .action_msg     = "Power Off"
  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