Merge branch 'for-linus' from kernel.org:/.../shaggy/jfs-2.6 manually
[linux-2.6] / 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/sched.h>
16 #include <linux/sysdev.h>
17 #include <asm/io.h>
18 #include "sleep.h"
19
20 int acpi_sleep_prepare(u32 acpi_state)
21 {
22 #ifdef CONFIG_ACPI_SLEEP
23         /* do we have a wakeup address for S2 and S3? */
24         if (acpi_state == ACPI_STATE_S3) {
25                 if (!acpi_wakeup_address) {
26                         return -EFAULT;
27                 }
28                 acpi_set_firmware_waking_vector((acpi_physical_address)
29                                                 virt_to_phys((void *)
30                                                              acpi_wakeup_address));
31
32         }
33         ACPI_FLUSH_CPU_CACHE();
34         acpi_enable_wakeup_device_prep(acpi_state);
35 #endif
36         if (acpi_state == ACPI_STATE_S5) {
37                 acpi_wakeup_gpe_poweroff_prepare();
38         }
39         acpi_enter_sleep_state_prep(acpi_state);
40         return 0;
41 }
42
43 #ifdef CONFIG_PM
44
45 void acpi_power_off(void)
46 {
47         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
48         printk("%s called\n", __FUNCTION__);
49         local_irq_disable();
50         /* Some SMP machines only can poweroff in boot CPU */
51         acpi_enter_sleep_state(ACPI_STATE_S5);
52 }
53
54 static int acpi_shutdown(struct sys_device *x)
55 {
56         if (system_state == SYSTEM_POWER_OFF) {
57                 /* Prepare if we are going to power off the system */
58                 return acpi_sleep_prepare(ACPI_STATE_S5);
59         }
60         return 0;
61 }
62
63 static struct sysdev_class acpi_sysclass = {
64         set_kset_name("acpi"),
65         .shutdown = acpi_shutdown
66 };
67
68 static struct sys_device device_acpi = {
69         .id = 0,
70         .cls = &acpi_sysclass,
71 };
72
73 static int acpi_poweroff_init(void)
74 {
75         if (!acpi_disabled) {
76                 u8 type_a, type_b;
77                 acpi_status status;
78
79                 status =
80                     acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
81                 if (ACPI_SUCCESS(status)) {
82                         int error;
83                         error = sysdev_class_register(&acpi_sysclass);
84                         if (!error)
85                                 error = sysdev_register(&device_acpi);
86                         if (!error)
87                                 pm_power_off = acpi_power_off;
88                         return error;
89                 }
90         }
91         return 0;
92 }
93
94 late_initcall(acpi_poweroff_init);
95
96 #endif                          /* CONFIG_PM */