2 * poweroff.c - ACPI handler for powering off the system.
4 * AKA S5, but it is independent of whether or not the kernel supports
5 * any other sleep support in the system.
7 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
9 * This file is released under the GPLv2.
13 #include <linux/init.h>
14 #include <acpi/acpi_bus.h>
15 #include <linux/sysdev.h>
19 int acpi_sleep_prepare(u32 acpi_state)
21 #ifdef CONFIG_ACPI_SLEEP
22 /* do we have a wakeup address for S2 and S3? */
23 if (acpi_state == ACPI_STATE_S3) {
24 if (!acpi_wakeup_address) {
27 acpi_set_firmware_waking_vector((acpi_physical_address)
29 acpi_wakeup_address));
32 ACPI_FLUSH_CPU_CACHE();
33 acpi_enable_wakeup_device_prep(acpi_state);
35 acpi_gpe_sleep_prepare(acpi_state);
36 acpi_enter_sleep_state_prep(acpi_state);
42 void acpi_power_off(void)
44 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
45 printk("%s called\n", __FUNCTION__);
47 /* Some SMP machines only can poweroff in boot CPU */
48 acpi_enter_sleep_state(ACPI_STATE_S5);
51 static int acpi_shutdown(struct sys_device *x)
53 switch (system_state) {
54 case SYSTEM_POWER_OFF:
55 /* Prepare to power off the system */
56 return acpi_sleep_prepare(ACPI_STATE_S5);
57 case SYSTEM_SUSPEND_DISK:
58 /* Prepare to suspend the system to disk */
59 return acpi_sleep_prepare(ACPI_STATE_S4);
65 static struct sysdev_class acpi_sysclass = {
66 set_kset_name("acpi"),
67 .shutdown = acpi_shutdown
70 static struct sys_device device_acpi = {
72 .cls = &acpi_sysclass,
75 static int acpi_poweroff_init(void)
82 acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
83 if (ACPI_SUCCESS(status)) {
85 error = sysdev_class_register(&acpi_sysclass);
87 error = sysdev_register(&device_acpi);
89 pm_power_off = acpi_power_off;
96 late_initcall(acpi_poweroff_init);
98 #endif /* CONFIG_PM */