/*
 * linux/kernel/irq/pm.c
 *
 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
 *
 * This file contains power management functions related to interrupts.
 */

#include <linux/irq.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/syscore_ops.h>

#include "internals.h"

void suspend_device_irqs(void)
{
	struct irq_desc *desc;
	int irq;

	for_each_irq_desc(irq, desc) {
		unsigned long flags;

		raw_spin_lock_irqsave(&desc->lock, flags);
		__disable_irq(desc, irq, true);
		raw_spin_unlock_irqrestore(&desc->lock, flags);
	}

	for_each_irq_desc(irq, desc)
		if (desc->istate & IRQS_SUSPENDED)
			synchronize_irq(irq);
}
EXPORT_SYMBOL_GPL(suspend_device_irqs);

static void resume_irqs(bool want_early)
{
	struct irq_desc *desc;
	int irq;

	for_each_irq_desc_reverse(irq, desc) {
		unsigned long flags;
		bool is_early = desc->action &&
			desc->action->flags & IRQF_EARLY_RESUME;

		if (is_early != want_early)
			continue;

		raw_spin_lock_irqsave(&desc->lock, flags);
		__enable_irq(desc, irq, true);
		raw_spin_unlock_irqrestore(&desc->lock, flags);
	}
}

static void irq_pm_syscore_resume(void)
{
	resume_irqs(true);
}

static struct syscore_ops irq_pm_syscore_ops = {
	.resume		= irq_pm_syscore_resume,
};

static int __init irq_pm_init_ops(void)
{
	register_syscore_ops(&irq_pm_syscore_ops);
	return 0;
}

device_initcall(irq_pm_init_ops);

void resume_device_irqs(void)
{
	resume_irqs(false);
}
EXPORT_SYMBOL_GPL(resume_device_irqs);

int check_wakeup_irqs(void)
{
	struct irq_desc *desc;
	int irq;

	for_each_irq_desc(irq, desc) {
		if (irqd_is_wakeup_set(&desc->irq_data)) {
			if (desc->istate & IRQS_PENDING) {
				pr_info("Wakeup IRQ %d %s pending, suspend aborted\n",
					irq,
					desc->action && desc->action->name ?
					desc->action->name : "");
				return -EBUSY;
			}
			continue;
		}
		if (desc->istate & IRQS_SUSPENDED &&
		    irq_desc_get_chip(desc)->flags & IRQCHIP_MASK_ON_SUSPEND)
			mask_irq(desc);
	}

	return 0;
}