[PATCH] genirq: add irq-wake (power-management) support

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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index b61784ee78b2..3ed7aee84865 100644
--- a/kernel/irq/manage.c
+++ b/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->chip->set_wake)
+                ret = desc->chip->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