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>
#include <linux/cpumask.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)
{
    /* run sysrq poweroff on boot cpu */
    schedule_work_on(cpumask_first(cpu_online_mask), &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 __init pm_sysrq_init(void)
{
    register_sysrq_key('o', &sysrq_poweroff_op);
    return 0;
}

subsys_initcall(pm_sysrq_init);