ACPI / Wakeup: Simplify enabling of wakeup devices
[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 || !dev->wakeup.state.enabled
40                     || sleep_state > (u32) dev->wakeup.sleep_state)
41                         continue;
42
43                 if (dev->wakeup.state.enabled)
44                         acpi_enable_wakeup_device_power(dev, sleep_state);
45
46                 /* The wake-up power should have been enabled already. */
47                 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
48                                 ACPI_GPE_TYPE_WAKE);
49         }
50 }
51
52 /**
53  * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
54  * @sleep_state: ACPI system sleep state.
55  */
56 void acpi_disable_wakeup_devices(u8 sleep_state)
57 {
58         struct list_head *node, *next;
59
60         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
61                 struct acpi_device *dev =
62                         container_of(node, struct acpi_device, wakeup_list);
63
64                 if (!dev->wakeup.flags.valid || !dev->wakeup.state.enabled
65                     || (sleep_state > (u32) dev->wakeup.sleep_state))
66                         continue;
67
68                 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
69                                 ACPI_GPE_TYPE_WAKE);
70                 acpi_disable_wakeup_device_power(dev);
71         }
72 }
73
74 int __init acpi_wakeup_device_init(void)
75 {
76         struct list_head *node, *next;
77
78         mutex_lock(&acpi_device_lock);
79         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
80                 struct acpi_device *dev = container_of(node,
81                                                        struct acpi_device,
82                                                        wakeup_list);
83                 if (dev->wakeup.flags.always_enabled)
84                         dev->wakeup.state.enabled = 1;
85         }
86         mutex_unlock(&acpi_device_lock);
87         return 0;
88 }