regmap: name irq_chip based on regmap_irq_chip's name
[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 #include <linux/interrupt.h>
13
14 static LIST_HEAD(syscore_ops_list);
15 static DEFINE_MUTEX(syscore_ops_lock);
16
17 /**
18  * register_syscore_ops - Register a set of system core operations.
19  * @ops: System core operations to register.
20  */
21 void register_syscore_ops(struct syscore_ops *ops)
22 {
23         mutex_lock(&syscore_ops_lock);
24         list_add_tail(&ops->node, &syscore_ops_list);
25         mutex_unlock(&syscore_ops_lock);
26 }
27 EXPORT_SYMBOL_GPL(register_syscore_ops);
28
29 /**
30  * unregister_syscore_ops - Unregister a set of system core operations.
31  * @ops: System core operations to unregister.
32  */
33 void unregister_syscore_ops(struct syscore_ops *ops)
34 {
35         mutex_lock(&syscore_ops_lock);
36         list_del(&ops->node);
37         mutex_unlock(&syscore_ops_lock);
38 }
39 EXPORT_SYMBOL_GPL(unregister_syscore_ops);
40
41 #ifdef CONFIG_PM_SLEEP
42 /**
43  * syscore_suspend - Execute all the registered system core suspend callbacks.
44  *
45  * This function is executed with one CPU on-line and disabled interrupts.
46  */
47 int syscore_suspend(void)
48 {
49         struct syscore_ops *ops;
50         int ret = 0;
51
52         pr_debug("Checking wakeup interrupts\n");
53
54         /* Return error code if there are any wakeup interrupts pending. */
55         ret = check_wakeup_irqs();
56         if (ret)
57                 return ret;
58
59         WARN_ONCE(!irqs_disabled(),
60                 "Interrupts enabled before system core suspend.\n");
61
62         list_for_each_entry_reverse(ops, &syscore_ops_list, node)
63                 if (ops->suspend) {
64                         if (initcall_debug)
65                                 pr_info("PM: Calling %pF\n", ops->suspend);
66                         ret = ops->suspend();
67                         if (ret)
68                                 goto err_out;
69                         WARN_ONCE(!irqs_disabled(),
70                                 "Interrupts enabled after %pF\n", ops->suspend);
71                 }
72
73         return 0;
74
75  err_out:
76         pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
77
78         list_for_each_entry_continue(ops, &syscore_ops_list, node)
79                 if (ops->resume)
80                         ops->resume();
81
82         return ret;
83 }
84 EXPORT_SYMBOL_GPL(syscore_suspend);
85
86 /**
87  * syscore_resume - Execute all the registered system core resume callbacks.
88  *
89  * This function is executed with one CPU on-line and disabled interrupts.
90  */
91 void syscore_resume(void)
92 {
93         struct syscore_ops *ops;
94
95         WARN_ONCE(!irqs_disabled(),
96                 "Interrupts enabled before system core resume.\n");
97
98         list_for_each_entry(ops, &syscore_ops_list, node)
99                 if (ops->resume) {
100                         ops->resume();
101                         WARN_ONCE(!irqs_disabled(),
102                                 "Interrupts enabled after %pF\n", ops->resume);
103                 }
104         if (initcall_debug) {
105                 list_for_each_entry(ops, &syscore_ops_list, node)
106                         if (ops->resume) {
107                                 pr_info("PM: Called %pF\n", ops->resume);
108                         }
109         }
110 }
111 EXPORT_SYMBOL_GPL(syscore_resume);
112 #endif /* CONFIG_PM_SLEEP */
113
114 /**
115  * syscore_shutdown - Execute all the registered system core shutdown callbacks.
116  */
117 void syscore_shutdown(void)
118 {
119         struct syscore_ops *ops;
120
121         mutex_lock(&syscore_ops_lock);
122
123         list_for_each_entry_reverse(ops, &syscore_ops_list, node)
124                 if (ops->shutdown) {
125                         if (initcall_debug)
126                                 pr_info("PM: Calling %pF\n", ops->shutdown);
127                         ops->shutdown();
128                 }
129
130         mutex_unlock(&syscore_ops_lock);
131 }