Merge branch 'bkl_removal' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[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_devices - Enable wake-up device GPEs.
25  * @sleep_state: ACPI system sleep state.
26  *
27  * Enable wakeup device power of devices with the state.enable flag set and set
28  * the wakeup enable mask bits in the GPE registers that correspond to wakeup
29  * devices.
30  */
31 void acpi_enable_wakeup_devices(u8 sleep_state)
32 {
33         struct list_head *node, *next;
34
35         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
36                 struct acpi_device *dev =
37                         container_of(node, struct acpi_device, wakeup_list);
38
39                 if (!dev->wakeup.flags.valid
40                     || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count)
41                     || sleep_state > (u32) dev->wakeup.sleep_state)
42                         continue;
43
44                 if (dev->wakeup.state.enabled)
45                         acpi_enable_wakeup_device_power(dev, sleep_state);
46
47                 /* The wake-up power should have been enabled already. */
48                 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
49                                 ACPI_GPE_ENABLE);
50         }
51 }
52
53 /**
54  * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
55  * @sleep_state: ACPI system sleep state.
56  */
57 void acpi_disable_wakeup_devices(u8 sleep_state)
58 {
59         struct list_head *node, *next;
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                     || !(dev->wakeup.state.enabled || dev->wakeup.prepare_count)
67                     || (sleep_state > (u32) dev->wakeup.sleep_state))
68                         continue;
69
70                 acpi_gpe_wakeup(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
71                                 ACPI_GPE_DISABLE);
72
73                 if (dev->wakeup.state.enabled)
74                         acpi_disable_wakeup_device_power(dev);
75         }
76 }
77
78 int __init acpi_wakeup_device_init(void)
79 {
80         struct list_head *node, *next;
81
82         mutex_lock(&acpi_device_lock);
83         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
84                 struct acpi_device *dev = container_of(node,
85                                                        struct acpi_device,
86                                                        wakeup_list);
87                 if (dev->wakeup.flags.always_enabled)
88                         dev->wakeup.state.enabled = 1;
89         }
90         mutex_unlock(&acpi_device_lock);
91         return 0;
92 }