Commit | Line | Data |
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40dc166c RW |
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> | |
88759622 | 12 | #include <linux/interrupt.h> |
40dc166c RW |
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 | ||
88759622 CC |
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 | ||
40dc166c RW |
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 | } | |
19234c08 | 84 | EXPORT_SYMBOL_GPL(syscore_suspend); |
40dc166c RW |
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 | if (initcall_debug) | |
101 | pr_info("PM: Calling %pF\n", ops->resume); | |
102 | ops->resume(); | |
103 | WARN_ONCE(!irqs_disabled(), | |
104 | "Interrupts enabled after %pF\n", ops->resume); | |
105 | } | |
106 | } | |
19234c08 | 107 | EXPORT_SYMBOL_GPL(syscore_resume); |
40dc166c RW |
108 | #endif /* CONFIG_PM_SLEEP */ |
109 | ||
110 | /** | |
111 | * syscore_shutdown - Execute all the registered system core shutdown callbacks. | |
112 | */ | |
113 | void syscore_shutdown(void) | |
114 | { | |
115 | struct syscore_ops *ops; | |
116 | ||
117 | mutex_lock(&syscore_ops_lock); | |
118 | ||
119 | list_for_each_entry_reverse(ops, &syscore_ops_list, node) | |
120 | if (ops->shutdown) { | |
121 | if (initcall_debug) | |
122 | pr_info("PM: Calling %pF\n", ops->shutdown); | |
123 | ops->shutdown(); | |
124 | } | |
125 | ||
126 | mutex_unlock(&syscore_ops_lock); | |
127 | } |