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Viewing changes to drivers/base/syscore.c

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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drivers/base/syscore.c
 
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/*
 
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 *  syscore.c - Execution of system core operations.
 
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 *
 
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 *  Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 
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 *
 
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 *  This file is released under the GPLv2.
 
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 */
 
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#include <linux/syscore_ops.h>
 
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#include <linux/mutex.h>
 
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#include <linux/module.h>
 
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#include <linux/interrupt.h>
 
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static LIST_HEAD(syscore_ops_list);
 
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static DEFINE_MUTEX(syscore_ops_lock);
 
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/**
 
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 * register_syscore_ops - Register a set of system core operations.
 
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 * @ops: System core operations to register.
 
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 */
 
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void register_syscore_ops(struct syscore_ops *ops)
 
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{
 
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        mutex_lock(&syscore_ops_lock);
 
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        list_add_tail(&ops->node, &syscore_ops_list);
 
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        mutex_unlock(&syscore_ops_lock);
 
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}
 
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EXPORT_SYMBOL_GPL(register_syscore_ops);
 
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/**
 
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 * unregister_syscore_ops - Unregister a set of system core operations.
 
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 * @ops: System core operations to unregister.
 
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 */
 
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void unregister_syscore_ops(struct syscore_ops *ops)
 
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{
 
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        mutex_lock(&syscore_ops_lock);
 
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        list_del(&ops->node);
 
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        mutex_unlock(&syscore_ops_lock);
 
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}
 
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EXPORT_SYMBOL_GPL(unregister_syscore_ops);
 
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#ifdef CONFIG_PM_SLEEP
 
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/**
 
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 * syscore_suspend - Execute all the registered system core suspend callbacks.
 
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 *
 
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 * This function is executed with one CPU on-line and disabled interrupts.
 
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 */
 
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int syscore_suspend(void)
 
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{
 
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        struct syscore_ops *ops;
 
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        int ret = 0;
 
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        pr_debug("Checking wakeup interrupts\n");
 
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        /* Return error code if there are any wakeup interrupts pending. */
 
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        ret = check_wakeup_irqs();
 
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        if (ret)
 
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                return ret;
 
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        WARN_ONCE(!irqs_disabled(),
 
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                "Interrupts enabled before system core suspend.\n");
 
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        list_for_each_entry_reverse(ops, &syscore_ops_list, node)
 
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                if (ops->suspend) {
 
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                        if (initcall_debug)
 
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                                pr_info("PM: Calling %pF\n", ops->suspend);
 
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                        ret = ops->suspend();
 
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                        if (ret)
 
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                                goto err_out;
 
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                        WARN_ONCE(!irqs_disabled(),
 
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                                "Interrupts enabled after %pF\n", ops->suspend);
 
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                }
 
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        return 0;
 
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 err_out:
 
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        pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
 
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        list_for_each_entry_continue(ops, &syscore_ops_list, node)
 
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                if (ops->resume)
 
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                        ops->resume();
 
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        return ret;
 
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}
 
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EXPORT_SYMBOL_GPL(syscore_suspend);
 
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/**
 
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 * syscore_resume - Execute all the registered system core resume callbacks.
 
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 *
 
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 * This function is executed with one CPU on-line and disabled interrupts.
 
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 */
 
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void syscore_resume(void)
 
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{
 
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        struct syscore_ops *ops;
 
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        WARN_ONCE(!irqs_disabled(),
 
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                "Interrupts enabled before system core resume.\n");
 
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        list_for_each_entry(ops, &syscore_ops_list, node)
 
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                if (ops->resume) {
 
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                        if (initcall_debug)
 
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                                pr_info("PM: Calling %pF\n", ops->resume);
 
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                        ops->resume();
 
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                        WARN_ONCE(!irqs_disabled(),
 
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                                "Interrupts enabled after %pF\n", ops->resume);
 
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                }
 
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}
 
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EXPORT_SYMBOL_GPL(syscore_resume);
 
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#endif /* CONFIG_PM_SLEEP */
 
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/**
 
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 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
 
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 */
 
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void syscore_shutdown(void)
 
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{
 
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        struct syscore_ops *ops;
 
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        mutex_lock(&syscore_ops_lock);
 
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        list_for_each_entry_reverse(ops, &syscore_ops_list, node)
 
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                if (ops->shutdown) {
 
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                        if (initcall_debug)
 
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                                pr_info("PM: Calling %pF\n", ops->shutdown);
 
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                        ops->shutdown();
 
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                }
 
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        mutex_unlock(&syscore_ops_lock);
 
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}