PM: Add missing syscore_suspend() and syscore_resume() calls
[linux-2.6.git] / drivers / base / syscore.c
1 /*
2  *  syscore.c - Execution of system core operations.
3  *
4  *  Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
5  *
6  *  This file is released under the GPLv2.
7  */
8
9 #include <linux/syscore_ops.h>
10 #include <linux/mutex.h>
11 #include <linux/module.h>
12
13 static LIST_HEAD(syscore_ops_list);
14 static DEFINE_MUTEX(syscore_ops_lock);
15
16 /**
17  * register_syscore_ops - Register a set of system core operations.
18  * @ops: System core operations to register.
19  */
20 void register_syscore_ops(struct syscore_ops *ops)
21 {
22         mutex_lock(&syscore_ops_lock);
23         list_add_tail(&ops->node, &syscore_ops_list);
24         mutex_unlock(&syscore_ops_lock);
25 }
26 EXPORT_SYMBOL_GPL(register_syscore_ops);
27
28 /**
29  * unregister_syscore_ops - Unregister a set of system core operations.
30  * @ops: System core operations to unregister.
31  */
32 void unregister_syscore_ops(struct syscore_ops *ops)
33 {
34         mutex_lock(&syscore_ops_lock);
35         list_del(&ops->node);
36         mutex_unlock(&syscore_ops_lock);
37 }
38 EXPORT_SYMBOL_GPL(unregister_syscore_ops);
39
40 #ifdef CONFIG_PM_SLEEP
41 /**
42  * syscore_suspend - Execute all the registered system core suspend callbacks.
43  *
44  * This function is executed with one CPU on-line and disabled interrupts.
45  */
46 int syscore_suspend(void)
47 {
48         struct syscore_ops *ops;
49         int ret = 0;
50
51         WARN_ONCE(!irqs_disabled(),
52                 "Interrupts enabled before system core suspend.\n");
53
54         list_for_each_entry_reverse(ops, &syscore_ops_list, node)
55                 if (ops->suspend) {
56                         if (initcall_debug)
57                                 pr_info("PM: Calling %pF\n", ops->suspend);
58                         ret = ops->suspend();
59                         if (ret)
60                                 goto err_out;
61                         WARN_ONCE(!irqs_disabled(),
62                                 "Interrupts enabled after %pF\n", ops->suspend);
63                 }
64
65         return 0;
66
67  err_out:
68         pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
69
70         list_for_each_entry_continue(ops, &syscore_ops_list, node)
71                 if (ops->resume)
72                         ops->resume();
73
74         return ret;
75 }
76 EXPORT_SYMBOL_GPL(syscore_suspend);
77
78 /**
79  * syscore_resume - Execute all the registered system core resume callbacks.
80  *
81  * This function is executed with one CPU on-line and disabled interrupts.
82  */
83 void syscore_resume(void)
84 {
85         struct syscore_ops *ops;
86
87         WARN_ONCE(!irqs_disabled(),
88                 "Interrupts enabled before system core resume.\n");
89
90         list_for_each_entry(ops, &syscore_ops_list, node)
91                 if (ops->resume) {
92                         if (initcall_debug)
93                                 pr_info("PM: Calling %pF\n", ops->resume);
94                         ops->resume();
95                         WARN_ONCE(!irqs_disabled(),
96                                 "Interrupts enabled after %pF\n", ops->resume);
97                 }
98 }
99 EXPORT_SYMBOL_GPL(syscore_resume);
100 #endif /* CONFIG_PM_SLEEP */
101
102 /**
103  * syscore_shutdown - Execute all the registered system core shutdown callbacks.
104  */
105 void syscore_shutdown(void)
106 {
107         struct syscore_ops *ops;
108
109         mutex_lock(&syscore_ops_lock);
110
111         list_for_each_entry_reverse(ops, &syscore_ops_list, node)
112                 if (ops->shutdown) {
113                         if (initcall_debug)
114                                 pr_info("PM: Calling %pF\n", ops->shutdown);
115                         ops->shutdown();
116                 }
117
118         mutex_unlock(&syscore_ops_lock);
119 }