Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / 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 wakeup devices
25  *      @sleep_state:   ACPI state
26  * Enable all wakup devices power if the devices' wakeup level
27  * is higher than requested sleep level
28  */
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 ||
40                     !dev->wakeup.state.enabled ||
41                     (sleep_state > (u32) dev->wakeup.sleep_state))
42                         continue;
43
44                 acpi_enable_wakeup_device_power(dev, sleep_state);
45         }
46 }
47
48 /**
49  * acpi_enable_wakeup_device - enable wakeup devices
50  *      @sleep_state:   ACPI state
51  * Enable all wakup devices's GPE
52  */
53 void acpi_enable_wakeup_device(u8 sleep_state)
54 {
55         struct list_head *node, *next;
56
57         /* 
58          * Caution: this routine must be invoked when interrupt is disabled 
59          * Refer ACPI2.0: P212
60          */
61         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
62                 struct acpi_device *dev =
63                         container_of(node, struct acpi_device, wakeup_list);
64
65                 if (!dev->wakeup.flags.valid)
66                         continue;
67
68                 /* If users want to disable run-wake GPE,
69                  * we only disable it for wake and leave it for runtime
70                  */
71                 if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
72                     || sleep_state > (u32) dev->wakeup.sleep_state) {
73                         if (dev->wakeup.flags.run_wake) {
74                                 /* set_gpe_type will disable GPE, leave it like that */
75                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
76                                                   dev->wakeup.gpe_number,
77                                                   ACPI_GPE_TYPE_RUNTIME);
78                         }
79                         continue;
80                 }
81                 if (!dev->wakeup.flags.run_wake)
82                         acpi_enable_gpe(dev->wakeup.gpe_device,
83                                         dev->wakeup.gpe_number);
84         }
85 }
86
87 /**
88  * acpi_disable_wakeup_device - disable devices' wakeup capability
89  *      @sleep_state:   ACPI state
90  * Disable all wakup devices's GPE and wakeup capability
91  */
92 void acpi_disable_wakeup_device(u8 sleep_state)
93 {
94         struct list_head *node, *next;
95
96         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
97                 struct acpi_device *dev =
98                         container_of(node, struct acpi_device, wakeup_list);
99
100                 if (!dev->wakeup.flags.valid)
101                         continue;
102
103                 if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
104                     || sleep_state > (u32) dev->wakeup.sleep_state) {
105                         if (dev->wakeup.flags.run_wake) {
106                                 acpi_set_gpe_type(dev->wakeup.gpe_device,
107                                                   dev->wakeup.gpe_number,
108                                                   ACPI_GPE_TYPE_WAKE_RUN);
109                                 /* Re-enable it, since set_gpe_type will disable it */
110                                 acpi_enable_gpe(dev->wakeup.gpe_device,
111                                                 dev->wakeup.gpe_number);
112                         }
113                         continue;
114                 }
115
116                 acpi_disable_wakeup_device_power(dev);
117                 /* Never disable run-wake GPE */
118                 if (!dev->wakeup.flags.run_wake) {
119                         acpi_disable_gpe(dev->wakeup.gpe_device,
120                                          dev->wakeup.gpe_number);
121                         acpi_clear_gpe(dev->wakeup.gpe_device,
122                                        dev->wakeup.gpe_number, ACPI_NOT_ISR);
123                 }
124         }
125 }
126
127 int __init acpi_wakeup_device_init(void)
128 {
129         struct list_head *node, *next;
130
131         mutex_lock(&acpi_device_lock);
132         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
133                 struct acpi_device *dev = container_of(node,
134                                                        struct acpi_device,
135                                                        wakeup_list);
136                 /* In case user doesn't load button driver */
137                 if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
138                         continue;
139                 acpi_set_gpe_type(dev->wakeup.gpe_device,
140                                   dev->wakeup.gpe_number,
141                                   ACPI_GPE_TYPE_WAKE_RUN);
142                 acpi_enable_gpe(dev->wakeup.gpe_device,
143                                 dev->wakeup.gpe_number);
144                 dev->wakeup.state.enabled = 1;
145         }
146         mutex_unlock(&acpi_device_lock);
147         return 0;
148 }