[patch 23/50] genirq: add irq-wake (power-management) support

[patch 23/50] genirq: add irq-wake (power-management) support

[Ingo Molnar]

From: Thomas Gleixner <tglx@linutronix.de>

enable platforms to set the irq-wake (power-management) properties
of an IRQ.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 include/linux/interrupt.h |   14 ++++++++++++++
 kernel/irq/manage.c       |   21 +++++++++++++++++++++
 2 files changed, 35 insertions(+)

Index: linux-genirq.q/include/linux/interrupt.h
===================================================================
--- linux-genirq.q.orig/include/linux/interrupt.h
+++ linux-genirq.q/include/linux/interrupt.h
@@ -56,6 +56,20 @@ extern void free_irq(unsigned int, void 
 extern void disable_irq_nosync(unsigned int irq);
 extern void disable_irq(unsigned int irq);
 extern void enable_irq(unsigned int irq);
+
+/* IRQ wakeup (PM) control: */
+extern int set_irq_wake(unsigned int irq, unsigned int on);
+
+static inline int enable_irq_wake(unsigned int irq)
+{
+	return set_irq_wake(irq, 1);
+}
+
+static inline int disable_irq_wake(unsigned int irq)
+{
+	return set_irq_wake(irq, 0);
+}
+
 #endif
 
 #ifndef __ARCH_SET_SOFTIRQ_PENDING
Index: linux-genirq.q/kernel/irq/manage.c
===================================================================
--- linux-genirq.q.orig/kernel/irq/manage.c
+++ linux-genirq.q/kernel/irq/manage.c
@@ -133,6 +133,27 @@ void enable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(enable_irq);
 
+/**
+ *	set_irq_wake - control irq power management wakeup
+ *	@irq:	interrupt to control
+ *	@on:	enable/disable power management wakeup
+ *
+ *	Enable/disable power management wakeup mode
+ */
+int set_irq_wake(unsigned int irq, unsigned int on)
+{
+	struct irq_desc *desc = irq_desc + irq;
+	unsigned long flags;
+	int ret = -ENXIO;
+
+	spin_lock_irqsave(&desc->lock, flags);
+	if (desc->handler->set_wake)
+		ret = desc->handler->set_wake(irq, on);
+	spin_unlock_irqrestore(&desc->lock, flags);
+	return ret;
+}
+EXPORT_SYMBOL(set_irq_wake);
+
 /*
  * Internal function that tells the architecture code whether a
  * particular irq has been exclusively allocated or is available