2 * syscore.c - Execution of system core operations.
4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
6 * This file is released under the GPLv2.
9 #include <linux/syscore_ops.h>
10 #include <linux/mutex.h>
11 #include <linux/module.h>
12 #include <linux/interrupt.h>
13 #include <linux/wakeup_reason.h>
15 static LIST_HEAD(syscore_ops_list);
16 static DEFINE_MUTEX(syscore_ops_lock);
19 * register_syscore_ops - Register a set of system core operations.
20 * @ops: System core operations to register.
22 void register_syscore_ops(struct syscore_ops *ops)
24 mutex_lock(&syscore_ops_lock);
25 list_add_tail(&ops->node, &syscore_ops_list);
26 mutex_unlock(&syscore_ops_lock);
28 EXPORT_SYMBOL_GPL(register_syscore_ops);
31 * unregister_syscore_ops - Unregister a set of system core operations.
32 * @ops: System core operations to unregister.
34 void unregister_syscore_ops(struct syscore_ops *ops)
36 mutex_lock(&syscore_ops_lock);
38 mutex_unlock(&syscore_ops_lock);
40 EXPORT_SYMBOL_GPL(unregister_syscore_ops);
42 #ifdef CONFIG_PM_SLEEP
44 * syscore_suspend - Execute all the registered system core suspend callbacks.
46 * This function is executed with one CPU on-line and disabled interrupts.
48 int syscore_suspend(void)
50 struct syscore_ops *ops;
53 pr_debug("Checking wakeup interrupts\n");
55 /* Return error code if there are any wakeup interrupts pending. */
56 ret = check_wakeup_irqs();
60 WARN_ONCE(!irqs_disabled(),
61 "Interrupts enabled before system core suspend.\n");
63 list_for_each_entry_reverse(ops, &syscore_ops_list, node)
66 pr_info("PM: Calling %pF\n", ops->suspend);
70 WARN_ONCE(!irqs_disabled(),
71 "Interrupts enabled after %pF\n", ops->suspend);
77 log_suspend_abort_reason("System core suspend callback %pF failed",
79 pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
81 list_for_each_entry_continue(ops, &syscore_ops_list, node)
87 EXPORT_SYMBOL_GPL(syscore_suspend);
90 * syscore_resume - Execute all the registered system core resume callbacks.
92 * This function is executed with one CPU on-line and disabled interrupts.
94 void syscore_resume(void)
96 struct syscore_ops *ops;
98 WARN_ONCE(!irqs_disabled(),
99 "Interrupts enabled before system core resume.\n");
101 list_for_each_entry(ops, &syscore_ops_list, node)
104 pr_info("PM: Calling %pF\n", ops->resume);
106 WARN_ONCE(!irqs_disabled(),
107 "Interrupts enabled after %pF\n", ops->resume);
110 EXPORT_SYMBOL_GPL(syscore_resume);
111 #endif /* CONFIG_PM_SLEEP */
114 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
116 void syscore_shutdown(void)
118 struct syscore_ops *ops;
120 mutex_lock(&syscore_ops_lock);
122 list_for_each_entry_reverse(ops, &syscore_ops_list, node)
125 pr_info("PM: Calling %pF\n", ops->shutdown);
129 mutex_unlock(&syscore_ops_lock);