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
  13 static void
  14 acpi_power_off (void)
  15 {
  16         printk("%s called\n",__FUNCTION__);
  17         /* Some SMP machines only can poweroff in boot CPU */
  18         set_cpus_allowed(current, cpumask_of_cpu(0));
  19         acpi_enter_sleep_state_prep(ACPI_STATE_S5);
  20         ACPI_DISABLE_IRQS();
  21         acpi_enter_sleep_state(ACPI_STATE_S5);
  22 }
  23
  24 static int acpi_poweroff_init(void)
  25 {
  26         if (!acpi_disabled) {
  27                 u8 type_a, type_b;
  28                 acpi_status status;
  29
  30                 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
  31                 if (ACPI_SUCCESS(status))
  32                         pm_power_off = acpi_power_off;
  33         }
  34         return 0;
  35 }
  36
  37 late_initcall(acpi_poweroff_init);