46 lines
992 B
C
46 lines
992 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* poweroff.c - sysrq handler to gracefully power down machine.
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*/
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#include <linux/kernel.h>
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#include <linux/sysrq.h>
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#include <linux/init.h>
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#include <linux/pm.h>
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#include <linux/workqueue.h>
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#include <linux/reboot.h>
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#include <linux/cpumask.h>
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/*
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* When the user hits Sys-Rq o to power down the machine this is the
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* callback we use.
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*/
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static void do_poweroff(struct work_struct *dummy)
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{
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kernel_power_off();
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}
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static DECLARE_WORK(poweroff_work, do_poweroff);
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static void handle_poweroff(int key)
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{
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/* run sysrq poweroff on boot cpu */
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schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work);
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}
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static const struct sysrq_key_op sysrq_poweroff_op = {
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.handler = handle_poweroff,
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.help_msg = "poweroff(o)",
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.action_msg = "Power Off",
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.enable_mask = SYSRQ_ENABLE_BOOT,
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};
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static int __init pm_sysrq_init(void)
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{
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register_sysrq_key('o', &sysrq_poweroff_op);
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return 0;
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}
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subsys_initcall(pm_sysrq_init);
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