[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/interrupt.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. */
	ret = check_wakeup_irqs();
	if (ret)
		return ret;

	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>
88759622	12	#include <linux/interrupt.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. */
	57	ret = check_wakeup_irqs();
	58	if (ret)
	59	return ret;
	60
40dc166c RW	61	WARN_ONCE(!irqs_disabled(),
	62	"Interrupts enabled before system core suspend.\n");
	63
	64	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
	65	if (ops->suspend) {
	66	if (initcall_debug)
	67	pr_info("PM: Calling %pF\n", ops->suspend);
	68	ret = ops->suspend();
	69	if (ret)
	70	goto err_out;
	71	WARN_ONCE(!irqs_disabled(),
	72	"Interrupts enabled after %pF\n", ops->suspend);
	73	}
	74
bb3632c6	75	trace_suspend_resume(TPS("syscore_suspend"), 0, false);
40dc166c RW	76	return 0;
	77
	78	err_out:
	79	pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
	80
	81	list_for_each_entry_continue(ops, &syscore_ops_list, node)
	82	if (ops->resume)
	83	ops->resume();
	84
	85	return ret;
	86	}
19234c08	87	EXPORT_SYMBOL_GPL(syscore_suspend);
40dc166c RW	88
	89	/**
	90	* syscore_resume - Execute all the registered system core resume callbacks.
	91	*
	92	* This function is executed with one CPU on-line and disabled interrupts.
	93	*/
	94	void syscore_resume(void)
	95	{
	96	struct syscore_ops *ops;
	97
bb3632c6	98	trace_suspend_resume(TPS("syscore_resume"), 0, true);
40dc166c RW	99	WARN_ONCE(!irqs_disabled(),
	100	"Interrupts enabled before system core resume.\n");
	101
	102	list_for_each_entry(ops, &syscore_ops_list, node)
	103	if (ops->resume) {
	104	if (initcall_debug)
	105	pr_info("PM: Calling %pF\n", ops->resume);
	106	ops->resume();
	107	WARN_ONCE(!irqs_disabled(),
	108	"Interrupts enabled after %pF\n", ops->resume);
	109	}
bb3632c6	110	trace_suspend_resume(TPS("syscore_resume"), 0, false);
40dc166c	111	}
19234c08	112	EXPORT_SYMBOL_GPL(syscore_resume);
40dc166c RW	113	#endif /* CONFIG_PM_SLEEP */
	114
	115	/**
	116	* syscore_shutdown - Execute all the registered system core shutdown callbacks.
	117	*/
	118	void syscore_shutdown(void)
	119	{
	120	struct syscore_ops *ops;
	121
	122	mutex_lock(&syscore_ops_lock);
	123
	124	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
	125	if (ops->shutdown) {
	126	if (initcall_debug)
	127	pr_info("PM: Calling %pF\n", ops->shutdown);
	128	ops->shutdown();
	129	}
	130
	131	mutex_unlock(&syscore_ops_lock);
	132	}