1 files changed, 79 insertions, 0 deletions

diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
new file mode 100644
index 000000000000..638d8bedec14
--- /dev/null
+++ b/kernel/irq/pm.c
@@ -0,0 +1,79 @@
+/*
+ * 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 interrupts need to be
+ * disabled at the chip level and this function is provided for this purpose.
+ * It disables all interrupt lines that are enabled at the moment and sets the
+ * IRQ_SUSPENDED flag for 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);
+
+/**
+ * resume_device_irqs - enable interrupt lines disabled by suspend_device_irqs()
+ *
+ * Enable all interrupt lines previously disabled by suspend_device_irqs() that
+ * have the IRQ_SUSPENDED flag set.
+ */
+void resume_device_irqs(void)
+{
+        struct irq_desc *desc;
+        int irq;
+
+        for_each_irq_desc(irq, desc) {
+                unsigned long flags;
+
+                if (!(desc->status & IRQ_SUSPENDED))
+                        continue;
+
+                spin_lock_irqsave(&desc->lock, flags);
+                __enable_irq(desc, irq, true);
+                spin_unlock_irqrestore(&desc->lock, flags);
+        }
+}
+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;
+}