| /* |
| * 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 "internals.h" |
| |
| /** |
| * suspend_device_irqs - disable all currently enabled interrupt lines |
| * |
| * During system-wide suspend or hibernation device drivers need to be prevented |
| * from receiving interrupts and this function is provided for this purpose. |
| * It marks all interrupt lines in use, except for the timer ones, as disabled |
| * and sets the IRQ_SUSPENDED flag for each of them. |
| */ |
| void suspend_device_irqs(void) |
| { |
| struct irq_desc *desc; |
| int irq; |
| |
| for_each_irq_desc(irq, desc) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&desc->lock, flags); |
| __disable_irq(desc, irq, true); |
| spin_unlock_irqrestore(&desc->lock, flags); |
| } |
| |
| for_each_irq_desc(irq, desc) |
| if (desc->status & IRQ_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(irq, desc) { |
| unsigned long flags; |
| bool is_early = desc->action && |
| desc->action->flags & IRQF_EARLY_RESUME; |
| |
| if (is_early != want_early) |
| continue; |
| |
| spin_lock_irqsave(&desc->lock, flags); |
| __enable_irq(desc, irq, true); |
| spin_unlock_irqrestore(&desc->lock, flags); |
| } |
| } |
| |
| /** |
| * irq_pm_syscore_ops - enable interrupt lines early |
| * |
| * Enable all interrupt lines with %IRQF_EARLY_RESUME set. |
| */ |
| void irq_pm_syscore_resume(void) |
| { |
| resume_irqs(true); |
| } |
| |
| /** |
| * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs() |
| * |
| * Enable all non-%IRQF_EARLY_RESUME interrupt lines previously |
| * disabled by suspend_device_irqs() that have the IRQS_SUSPENDED flag |
| * set as well as those with %IRQF_FORCE_RESUME. |
| */ |
| void resume_device_irqs(void) |
| { |
| resume_irqs(false); |
| } |
| EXPORT_SYMBOL_GPL(resume_device_irqs); |
| |
| /** |
| * check_wakeup_irqs - check if any wake-up interrupts are pending |
| */ |
| int check_wakeup_irqs(void) |
| { |
| struct irq_desc *desc; |
| int irq; |
| |
| for_each_irq_desc(irq, desc) |
| if ((desc->status & IRQ_WAKEUP) && (desc->status & IRQ_PENDING)) |
| return -EBUSY; |
| |
| return 0; |
| } |