[deliverable/linux.git] / drivers / base / syscore.c

/*
 *  syscore.c - Execution of system core operations.
 *
 *  Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 *
 *  This file is released under the GPLv2.
 */

#include <linux/syscore_ops.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include <trace/events/power.h>

static LIST_HEAD(syscore_ops_list);
static DEFINE_MUTEX(syscore_ops_lock);

/**
 * register_syscore_ops - Register a set of system core operations.
 * @ops: System core operations to register.
 */
void register_syscore_ops(struct syscore_ops *ops)
{
	mutex_lock(&syscore_ops_lock);
	list_add_tail(&ops->node, &syscore_ops_list);
	mutex_unlock(&syscore_ops_lock);
}
EXPORT_SYMBOL_GPL(register_syscore_ops);

/**
 * unregister_syscore_ops - Unregister a set of system core operations.
 * @ops: System core operations to unregister.
 */
void unregister_syscore_ops(struct syscore_ops *ops)
{
	mutex_lock(&syscore_ops_lock);
	list_del(&ops->node);
	mutex_unlock(&syscore_ops_lock);
}
EXPORT_SYMBOL_GPL(unregister_syscore_ops);

#ifdef CONFIG_PM_SLEEP
/**
 * syscore_suspend - Execute all the registered system core suspend callbacks.
 *
 * This function is executed with one CPU on-line and disabled interrupts.
 */
int syscore_suspend(void)
{
	struct syscore_ops *ops;
	int ret = 0;

	trace_suspend_resume(TPS("syscore_suspend"), 0, true);
	pr_debug("Checking wakeup interrupts\n");

	/* Return error code if there are any wakeup interrupts pending. */
	if (pm_wakeup_pending())
		return -EBUSY;

	WARN_ONCE(!irqs_disabled(),
		"Interrupts enabled before system core suspend.\n");

	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
		if (ops->suspend) {
			if (initcall_debug)
				pr_info("PM: Calling %pF\n", ops->suspend);
			ret = ops->suspend();
			if (ret)
				goto err_out;
			WARN_ONCE(!irqs_disabled(),
				"Interrupts enabled after %pF\n", ops->suspend);
		}

	trace_suspend_resume(TPS("syscore_suspend"), 0, false);
	return 0;

 err_out:
	pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);

	list_for_each_entry_continue(ops, &syscore_ops_list, node)
		if (ops->resume)
			ops->resume();

	return ret;
}
EXPORT_SYMBOL_GPL(syscore_suspend);

/**
 * syscore_resume - Execute all the registered system core resume callbacks.
 *
 * This function is executed with one CPU on-line and disabled interrupts.
 */
void syscore_resume(void)
{
	struct syscore_ops *ops;

	trace_suspend_resume(TPS("syscore_resume"), 0, true);
	WARN_ONCE(!irqs_disabled(),
		"Interrupts enabled before system core resume.\n");

	list_for_each_entry(ops, &syscore_ops_list, node)
		if (ops->resume) {
			if (initcall_debug)
				pr_info("PM: Calling %pF\n", ops->resume);
			ops->resume();
			WARN_ONCE(!irqs_disabled(),
				"Interrupts enabled after %pF\n", ops->resume);
		}
	trace_suspend_resume(TPS("syscore_resume"), 0, false);
}
EXPORT_SYMBOL_GPL(syscore_resume);
#endif /* CONFIG_PM_SLEEP */

/**
 * syscore_shutdown - Execute all the registered system core shutdown callbacks.
 */
void syscore_shutdown(void)
{
	struct syscore_ops *ops;

	mutex_lock(&syscore_ops_lock);

	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
		if (ops->shutdown) {
			if (initcall_debug)
				pr_info("PM: Calling %pF\n", ops->shutdown);
			ops->shutdown();
		}

	mutex_unlock(&syscore_ops_lock);
}
Commit	Line	Data
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>
9ce7a258	12	#include <linux/suspend.h>
bb3632c6	13	#include <trace/events/power.h>
40dc166c RW	14
	15	static LIST_HEAD(syscore_ops_list);
	16	static DEFINE_MUTEX(syscore_ops_lock);
	17
	18	/**
	19	* register_syscore_ops - Register a set of system core operations.
	20	* @ops: System core operations to register.
	21	*/
	22	void register_syscore_ops(struct syscore_ops *ops)
	23	{
	24	mutex_lock(&syscore_ops_lock);
	25	list_add_tail(&ops->node, &syscore_ops_list);
	26	mutex_unlock(&syscore_ops_lock);
	27	}
	28	EXPORT_SYMBOL_GPL(register_syscore_ops);
	29
	30	/**
	31	* unregister_syscore_ops - Unregister a set of system core operations.
	32	* @ops: System core operations to unregister.
	33	*/
	34	void unregister_syscore_ops(struct syscore_ops *ops)
	35	{
	36	mutex_lock(&syscore_ops_lock);
	37	list_del(&ops->node);
	38	mutex_unlock(&syscore_ops_lock);
	39	}
	40	EXPORT_SYMBOL_GPL(unregister_syscore_ops);
	41
	42	#ifdef CONFIG_PM_SLEEP
	43	/**
	44	* syscore_suspend - Execute all the registered system core suspend callbacks.
	45	*
	46	* This function is executed with one CPU on-line and disabled interrupts.
	47	*/
	48	int syscore_suspend(void)
	49	{
	50	struct syscore_ops *ops;
	51	int ret = 0;
	52
bb3632c6	53	trace_suspend_resume(TPS("syscore_suspend"), 0, true);
88759622 CC	54	pr_debug("Checking wakeup interrupts\n");
	55
	56	/* Return error code if there are any wakeup interrupts pending. */
9ce7a258 TG	57	if (pm_wakeup_pending())
9ce7a258 TG	58	return -EBUSY;
88759622	59
40dc166c RW	60	WARN_ONCE(!irqs_disabled(),
	61	"Interrupts enabled before system core suspend.\n");
	62
	63	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
	64	if (ops->suspend) {
	65	if (initcall_debug)
	66	pr_info("PM: Calling %pF\n", ops->suspend);
	67	ret = ops->suspend();
	68	if (ret)
	69	goto err_out;
	70	WARN_ONCE(!irqs_disabled(),
	71	"Interrupts enabled after %pF\n", ops->suspend);
	72	}
	73
bb3632c6	74	trace_suspend_resume(TPS("syscore_suspend"), 0, false);
40dc166c RW	75	return 0;
	76
	77	err_out:
	78	pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
	79
	80	list_for_each_entry_continue(ops, &syscore_ops_list, node)
	81	if (ops->resume)
	82	ops->resume();
	83
	84	return ret;
	85	}
19234c08	86	EXPORT_SYMBOL_GPL(syscore_suspend);
40dc166c RW	87
	88	/**
	89	* syscore_resume - Execute all the registered system core resume callbacks.
	90	*
	91	* This function is executed with one CPU on-line and disabled interrupts.
	92	*/
	93	void syscore_resume(void)
	94	{
	95	struct syscore_ops *ops;
	96
bb3632c6	97	trace_suspend_resume(TPS("syscore_resume"), 0, true);
40dc166c RW	98	WARN_ONCE(!irqs_disabled(),
	99	"Interrupts enabled before system core resume.\n");
	100
	101	list_for_each_entry(ops, &syscore_ops_list, node)
	102	if (ops->resume) {
	103	if (initcall_debug)
	104	pr_info("PM: Calling %pF\n", ops->resume);
	105	ops->resume();
	106	WARN_ONCE(!irqs_disabled(),
	107	"Interrupts enabled after %pF\n", ops->resume);
	108	}
bb3632c6	109	trace_suspend_resume(TPS("syscore_resume"), 0, false);
40dc166c	110	}
19234c08	111	EXPORT_SYMBOL_GPL(syscore_resume);
40dc166c RW	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	}