Merge HEAD from master.kernel.org:/home/rmk/linux-2.6-serial.git
[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         /* Here, we support only S4BIOS, those we set the wakeup address */
25         /* S4OS is only supported for now via swsusp.. */
26         if (acpi_state == ACPI_STATE_S3 || acpi_state == ACPI_STATE_S4) {
27                 if (!acpi_wakeup_address) {
28                         return -EFAULT;
29                 }
30                 acpi_set_firmware_waking_vector((acpi_physical_address)
31                                                 virt_to_phys((void *)
32                                                              acpi_wakeup_address));
33
34         }
35         ACPI_FLUSH_CPU_CACHE();
36         acpi_enable_wakeup_device_prep(acpi_state);
37 #endif
38         if (acpi_state == ACPI_STATE_S5) {
39                 acpi_wakeup_gpe_poweroff_prepare();
40         }
41         acpi_enter_sleep_state_prep(acpi_state);
42         return 0;
43 }
44
45 #ifdef CONFIG_PM
46
47 void acpi_power_off(void)
48 {
49         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
50         printk("%s called\n", __FUNCTION__);
51         local_irq_disable();
52         /* Some SMP machines only can poweroff in boot CPU */
53         acpi_enter_sleep_state(ACPI_STATE_S5);
54 }
55
56 static int acpi_shutdown(struct sys_device *x)
57 {
58         if (system_state == SYSTEM_POWER_OFF) {
59                 /* Prepare if we are going to power off the system */
60                 return acpi_sleep_prepare(ACPI_STATE_S5);
61         }
62         return 0;
63 }
64
65 static struct sysdev_class acpi_sysclass = {
66         set_kset_name("acpi"),
67         .shutdown = acpi_shutdown
68 };
69
70 static struct sys_device device_acpi = {
71         .id = 0,
72         .cls = &acpi_sysclass,
73 };
74
75 static int acpi_poweroff_init(void)
76 {
77         if (!acpi_disabled) {
78                 u8 type_a, type_b;
79                 acpi_status status;
80
81                 status =
82                     acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
83                 if (ACPI_SUCCESS(status)) {
84                         int error;
85                         error = sysdev_class_register(&acpi_sysclass);
86                         if (!error)
87                                 error = sysdev_register(&device_acpi);
88                         if (!error)
89                                 pm_power_off = acpi_power_off;
90                         return error;
91                 }
92         }
93         return 0;
94 }
95
96 late_initcall(acpi_poweroff_init);
97
98 #endif /* CONFIG_PM */