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| 2 | |
| 3 | * poweroff.c - sysrq handler to gracefully power down machine.
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| 4 |
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| 5 |
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| 6 | #include <linux/kernel.h>
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| 7 | #include <linux/sysrq.h>
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| 8 | #include <linux/init.h>
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| 9 | #include <linux/pm.h>
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| 10 | #include <linux/workqueue.h>
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| 11 | #include <linux/reboot.h>
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| 12 | #include <linux/cpumask.h>
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| 13 |
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| 14 | |
| 15 | * When the user hits Sys-Rq o to power down the machine this is the
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| 16 | * callback we use.
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| 17 |
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| 18 |
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| 19 | static void do_poweroff(struct work_struct *dummy)
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| 20 | {
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| 21 | kernel_power_off();
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| 22 | }
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| 23 |
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| 24 | static DECLARE_WORK(poweroff_work, do_poweroff);
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| 25 |
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| 26 | static void handle_poweroff(u8 key)
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| 27 | {
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| 28 |
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| 29 | schedule_work_on(cpumask_first(cpu_online_mask), &poweroff_work);
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| 30 | }
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| 31 |
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| 32 | static const struct sysrq_key_op sysrq_poweroff_op = {
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| 33 | .handler = handle_poweroff,
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| 34 | .help_msg = "poweroff(o)",
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| 35 | .action_msg = "Power Off",
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| 36 | .enable_mask = SYSRQ_ENABLE_BOOT,
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| 37 | };
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| 38 |
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| 39 | static int __init pm_sysrq_init(void)
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| 40 | {
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| 41 | register_sysrq_key('o', &sysrq_poweroff_op);
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| 42 | return 0;
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| 43 | }
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| 44 |
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| 45 | subsys_initcall(pm_sysrq_init);
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