81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
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/*
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* linux/kernel/irq/pm.c
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*
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* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*
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* This file contains power management functions related to interrupts.
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*/
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include "internals.h"
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/**
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* suspend_device_irqs - disable all currently enabled interrupt lines
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*
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* During system-wide suspend or hibernation device drivers need to be prevented
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* from receiving interrupts and this function is provided for this purpose.
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* It marks all interrupt lines in use, except for the timer ones, as disabled
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* and sets the IRQ_SUSPENDED flag for each of them.
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*/
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void suspend_device_irqs(void)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc) {
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unsigned long flags;
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spin_lock_irqsave(&desc->lock, flags);
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if (desc->wake_depth == 0)
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__disable_irq(desc, irq, true);
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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for_each_irq_desc(irq, desc)
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if (desc->status & IRQ_SUSPENDED)
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synchronize_irq(irq);
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}
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EXPORT_SYMBOL_GPL(suspend_device_irqs);
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/**
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* resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
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*
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* Enable all interrupt lines previously disabled by suspend_device_irqs() that
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* have the IRQ_SUSPENDED flag set.
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*/
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void resume_device_irqs(void)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc) {
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unsigned long flags;
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if (!(desc->status & IRQ_SUSPENDED))
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continue;
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spin_lock_irqsave(&desc->lock, flags);
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__enable_irq(desc, irq, true);
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spin_unlock_irqrestore(&desc->lock, flags);
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}
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}
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EXPORT_SYMBOL_GPL(resume_device_irqs);
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/**
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* check_wakeup_irqs - check if any wake-up interrupts are pending
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*/
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int check_wakeup_irqs(void)
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{
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struct irq_desc *desc;
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int irq;
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for_each_irq_desc(irq, desc)
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if ((desc->status & IRQ_WAKEUP) && (desc->status & IRQ_PENDING))
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return -EBUSY;
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return 0;
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}
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