pcmcia: do not use io_req_t after call to pcmcia_request_io()
[linux-2.6.git] / drivers / acpi / wakeup.c
1 /*
2  * wakeup.c - support wakeup devices
3  * Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
4  */
5
6 #include <linux/init.h>
7 #include <linux/acpi.h>
8 #include <acpi/acpi_drivers.h>
9 #include <linux/kernel.h>
10 #include <linux/types.h>
11
12 #include "internal.h"
13 #include "sleep.h"
14
15 /*
16  * We didn't lock acpi_device_lock in the file, because it invokes oops in
17  * suspend/resume and isn't really required as this is called in S-state. At
18  * that time, there is no device hotplug
19  **/
20 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
21 ACPI_MODULE_NAME("wakeup_devices")
22
23 /**
24  * acpi_enable_wakeup_device_prep - Prepare wake-up devices.
25  * @sleep_state: ACPI system sleep state.
26  *
27  * Enable all wake-up devices' power, unless the requested system sleep state is
28  * too deep.
29  */
30 void acpi_enable_wakeup_device_prep(u8 sleep_state)
31 {
32         struct list_head *node, *next;
33
34         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
35                 struct acpi_device *dev = container_of(node,
36                                                        struct acpi_device,
37                                                        wakeup_list);
38
39                 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
40                     || (sleep_state > (u32) dev->wakeup.sleep_state))
41                         continue;
42
43                 acpi_enable_wakeup_device_power(dev, sleep_state);
44         }
45 }
46
47 /**
48  * acpi_enable_wakeup_device - Enable wake-up device GPEs.
49  * @sleep_state: ACPI system sleep state.
50  *
51  * Enable all wake-up devices' GPEs, with the assumption that
52  * acpi_disable_all_gpes() was executed before, so we don't need to disable any
53  * GPEs here.
54  */
55 void acpi_enable_wakeup_device(u8 sleep_state)
56 {
57         struct list_head *node, *next;
58
59         /* 
60          * Caution: this routine must be invoked when interrupt is disabled 
61          * Refer ACPI2.0: P212
62          */
63         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
64                 struct acpi_device *dev =
65                         container_of(node, struct acpi_device, wakeup_list);
66
67                 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
68                     || sleep_state > (u32) dev->wakeup.sleep_state)
69                         continue;
70
71                 /* The wake-up power should have been enabled already. */
72                 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
73                                 ACPI_GPE_TYPE_WAKE);
74         }
75 }
76
77 /**
78  * acpi_disable_wakeup_device - Disable devices' wakeup capability.
79  * @sleep_state: ACPI system sleep state.
80  *
81  * This function only affects devices with wakeup.state.enabled set, which means
82  * that it reverses the changes made by acpi_enable_wakeup_device_prep().
83  */
84 void acpi_disable_wakeup_device(u8 sleep_state)
85 {
86         struct list_head *node, *next;
87
88         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
89                 struct acpi_device *dev =
90                         container_of(node, struct acpi_device, wakeup_list);
91
92                 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
93                     || (sleep_state > (u32) dev->wakeup.sleep_state))
94                         continue;
95
96                 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
97                                 ACPI_GPE_TYPE_WAKE);
98                 acpi_disable_wakeup_device_power(dev);
99         }
100 }
101
102 int __init acpi_wakeup_device_init(void)
103 {
104         struct list_head *node, *next;
105
106         mutex_lock(&acpi_device_lock);
107         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
108                 struct acpi_device *dev = container_of(node,
109                                                        struct acpi_device,
110                                                        wakeup_list);
111                 if (dev->wakeup.flags.always_enabled)
112                         dev->wakeup.state.enabled = 1;
113         }
114         mutex_unlock(&acpi_device_lock);
115         return 0;
116 }