drivers/acpi/sleep/poweroff.c

   1 /*
   2  * poweroff.c - ACPI handler for powering off the system.
   3  *
   4  * AKA S5, but it is independent of whether or not the kernel supports
   5  * any other sleep support in the system.
   6  */
   7
   8 #include <linux/pm.h>
   9 #include <linux/init.h>
  10 #include <acpi/acpi_bus.h>
  11 #include <linux/sched.h>
  12 #include "sleep.h"
  13
  14 static void
  15 acpi_power_off (void)
  16 {
  17         printk("%s called\n",__FUNCTION__);
  18         /* Some SMP machines only can poweroff in boot CPU */
  19         set_cpus_allowed(current, cpumask_of_cpu(0));
  20         acpi_wakeup_gpe_poweroff_prepare();
  21         acpi_enter_sleep_state_prep(ACPI_STATE_S5);
  22         ACPI_DISABLE_IRQS();
  23         acpi_enter_sleep_state(ACPI_STATE_S5);
  24 }
  25
  26 static int acpi_poweroff_init(void)
  27 {
  28         if (!acpi_disabled) {
  29                 u8 type_a, type_b;
  30                 acpi_status status;
  31
  32                 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
  33                 if (ACPI_SUCCESS(status))
  34                         pm_power_off = acpi_power_off;
  35         }
  36         return 0;
  37 }
  38
  39 late_initcall(acpi_poweroff_init);