linux/drivers/base/syscore.c
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   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
  14static LIST_HEAD(syscore_ops_list);
  15static 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 */
  21void 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}
  27EXPORT_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 */
  33void 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}
  39EXPORT_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 */
  47int 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}
  84EXPORT_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 */
  91void 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}
 107EXPORT_SYMBOL_GPL(syscore_resume);
 108#endif /* CONFIG_PM_SLEEP */
 109
 110/**
 111 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
 112 */
 113void 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}
 128
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