ACPI / Button: Avoid disabling wakeup unnecessarily on remove
[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                     || sleep_state > (u32) dev->wakeup.sleep_state
41                     || !(device_may_wakeup(&dev->dev)
42                         || dev->wakeup.prepare_count))
43                         continue;
44
45                 if (device_may_wakeup(&dev->dev))
46                         acpi_enable_wakeup_device_power(dev, sleep_state);
47
48                 /* The wake-up power should have been enabled already. */
49                 acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
50                                 ACPI_GPE_ENABLE);
51         }
52 }
53
54 /**
55  * acpi_disable_wakeup_devices - Disable devices' wakeup capability.
56  * @sleep_state: ACPI system sleep state.
57  */
58 void acpi_disable_wakeup_devices(u8 sleep_state)
59 {
60         struct list_head *node, *next;
61
62         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
63                 struct acpi_device *dev =
64                         container_of(node, struct acpi_device, wakeup_list);
65
66                 if (!dev->wakeup.flags.valid
67                     || sleep_state > (u32) dev->wakeup.sleep_state
68                     || !(device_may_wakeup(&dev->dev)
69                         || dev->wakeup.prepare_count))
70                         continue;
71
72                 acpi_set_gpe_wake_mask(dev->wakeup.gpe_device, dev->wakeup.gpe_number,
73                                 ACPI_GPE_DISABLE);
74
75                 if (device_may_wakeup(&dev->dev))
76                         acpi_disable_wakeup_device_power(dev);
77         }
78 }
79
80 int __init acpi_wakeup_device_init(void)
81 {
82         struct list_head *node, *next;
83
84         mutex_lock(&acpi_device_lock);
85         list_for_each_safe(node, next, &acpi_wakeup_device_list) {
86                 struct acpi_device *dev = container_of(node,
87                                                        struct acpi_device,
88                                                        wakeup_list);
89                 if (device_can_wakeup(&dev->dev)) {
90                         /* Button GPEs are supposed to be always enabled. */
91                         acpi_enable_gpe(dev->wakeup.gpe_device,
92                                         dev->wakeup.gpe_number);
93                         device_set_wakeup_enable(&dev->dev, true);
94                 }
95         }
96         mutex_unlock(&acpi_device_lock);
97         return 0;
98 }