git.oblomov.eu Git - linux-2.6/blob - 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  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   8  *
   9  * This file is released under the GPLv2.
  10  */
  11
  12 #include <linux/pm.h>
  13 #include <linux/init.h>
  14 #include <acpi/acpi_bus.h>
  15 #include <linux/sysdev.h>
  16 #include <asm/io.h>
  17 #include "sleep.h"
  18
  19 int acpi_sleep_prepare(u32 acpi_state)
  20 {
  21         /* do we have a wakeup address for S2 and S3? */
  22         if (acpi_state == ACPI_STATE_S3) {
  23                 if (!acpi_wakeup_address) {
  24                         return -EFAULT;
  25                 }
  26                 acpi_set_firmware_waking_vector((acpi_physical_address)
  27                                                 virt_to_phys((void *)
  28                                                              acpi_wakeup_address));
  29
  30         }
  31         ACPI_FLUSH_CPU_CACHE();
  32         acpi_enable_wakeup_device_prep(acpi_state);
  33         acpi_gpe_sleep_prepare(acpi_state);
  34         acpi_enter_sleep_state_prep(acpi_state);
  35         return 0;
  36 }
  37
  38 #ifdef CONFIG_PM
  39
  40 static void acpi_power_off_prepare(void)
  41 {
  42         /* Prepare to power off the system */
  43         acpi_sleep_prepare(ACPI_STATE_S5);
  44 }
  45
  46 static void acpi_power_off(void)
  47 {
  48         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
  49         printk("%s called\n", __FUNCTION__);
  50         local_irq_disable();
  51         /* Some SMP machines only can poweroff in boot CPU */
  52         acpi_enter_sleep_state(ACPI_STATE_S5);
  53 }
  54
  55 static int acpi_poweroff_init(void)
  56 {
  57         if (!acpi_disabled) {
  58                 u8 type_a, type_b;
  59                 acpi_status status;
  60
  61                 status =
  62                     acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
  63                 if (ACPI_SUCCESS(status)) {
  64                         pm_power_off_prepare = acpi_power_off_prepare;
  65                         pm_power_off = acpi_power_off;
  66                 }
  67         }
  68         return 0;
  69 }
  70
  71 late_initcall(acpi_poweroff_init);
  72
  73 #endif                          /* CONFIG_PM */