[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>

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;

	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);
		}

	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;

	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);
		}
}
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>
	12
	13	static LIST_HEAD(syscore_ops_list);
	14	static DEFINE_MUTEX(syscore_ops_lock);
	15
	16	/**
	17	* register_syscore_ops - Register a set of system core operations.
	18	* @ops: System core operations to register.
	19	*/
	20	void register_syscore_ops(struct syscore_ops *ops)
	21	{
	22	mutex_lock(&syscore_ops_lock);
	23	list_add_tail(&ops->node, &syscore_ops_list);
	24	mutex_unlock(&syscore_ops_lock);
	25	}
	26	EXPORT_SYMBOL_GPL(register_syscore_ops);
	27
	28	/**
	29	* unregister_syscore_ops - Unregister a set of system core operations.
	30	* @ops: System core operations to unregister.
	31	*/
	32	void unregister_syscore_ops(struct syscore_ops *ops)
	33	{
	34	mutex_lock(&syscore_ops_lock);
	35	list_del(&ops->node);
	36	mutex_unlock(&syscore_ops_lock);
	37	}
	38	EXPORT_SYMBOL_GPL(unregister_syscore_ops);
	39
	40	#ifdef CONFIG_PM_SLEEP
	41	/**
	42	* syscore_suspend - Execute all the registered system core suspend callbacks.
	43	*
	44	* This function is executed with one CPU on-line and disabled interrupts.
	45	*/
	46	int syscore_suspend(void)
	47	{
	48	struct syscore_ops *ops;
	49	int ret = 0;
	50
	51	WARN_ONCE(!irqs_disabled(),
	52	"Interrupts enabled before system core suspend.\n");
	53
	54	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
	55	if (ops->suspend) {
	56	if (initcall_debug)
	57	pr_info("PM: Calling %pF\n", ops->suspend);
	58	ret = ops->suspend();
	59	if (ret)
	60	goto err_out;
	61	WARN_ONCE(!irqs_disabled(),
	62	"Interrupts enabled after %pF\n", ops->suspend);
	63	}
	64
65	return 0;
66
67	err_out:
68	pr_err("PM: System core suspend callback %pF failed.\n", ops->suspend);
69
70	list_for_each_entry_continue(ops, &syscore_ops_list, node)
71	if (ops->resume)
72	ops->resume();
73
74	return ret;
75	}
19234c08	76	EXPORT_SYMBOL_GPL(syscore_suspend);
40dc166c RW	77
	78	/**
	79	* syscore_resume - Execute all the registered system core resume callbacks.
	80	*
	81	* This function is executed with one CPU on-line and disabled interrupts.
	82	*/
	83	void syscore_resume(void)
	84	{
	85	struct syscore_ops *ops;
	86
	87	WARN_ONCE(!irqs_disabled(),
	88	"Interrupts enabled before system core resume.\n");
	89
	90	list_for_each_entry(ops, &syscore_ops_list, node)
	91	if (ops->resume) {
	92	if (initcall_debug)
	93	pr_info("PM: Calling %pF\n", ops->resume);
	94	ops->resume();
	95	WARN_ONCE(!irqs_disabled(),
	96	"Interrupts enabled after %pF\n", ops->resume);
	97	}
	98	}
19234c08	99	EXPORT_SYMBOL_GPL(syscore_resume);
40dc166c RW	100	#endif /* CONFIG_PM_SLEEP */
	101
	102	/**
	103	* syscore_shutdown - Execute all the registered system core shutdown callbacks.
	104	*/
	105	void syscore_shutdown(void)
	106	{
	107	struct syscore_ops *ops;
	108
	109	mutex_lock(&syscore_ops_lock);
	110
	111	list_for_each_entry_reverse(ops, &syscore_ops_list, node)
	112	if (ops->shutdown) {
	113	if (initcall_debug)
	114	pr_info("PM: Calling %pF\n", ops->shutdown);
	115	ops->shutdown();
	116	}
	117
	118	mutex_unlock(&syscore_ops_lock);
	119	}