From 9b3895637e6a040c60568f0e490213eee15f4002 Mon Sep 17 00:00:00 2001
From: David Brownell <dbrownell@users.sourceforge.net>
Date: Wed, 1 Oct 2008 14:46:18 -0700
Subject: [PATCH] --- yaml --- r: 116383 b: refs/heads/master c:
 0c5d1eb77a8be917b638344a22afe1398236482b h: refs/heads/master i:   116381:
 cffbf04a364560f23c5f27d87a60001dc9d170f6   116379:
 9ce7ee8d94a4a9366b3a31d77abd6d6d49f2d334   116375:
 34025af70a41e221673631b9c128e266efb91066   116367:
 068d07b20482ec676c2bc84a43601a2967835347   116351:
 639b340f8eaee44f9a800d366e311b131a42fb9b v: v3

---
 [refs]                       |  2 +-
 trunk/kernel/irq/chip.c      | 15 ++++++++-------
 trunk/kernel/irq/internals.h |  3 +++
 trunk/kernel/irq/manage.c    | 21 ++++++++++++++++++---
 4 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/[refs] b/[refs]
index 3ae37d50995c..e214795f2fe0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d6d5aeb661fc14655c417f3582ae7ec52985d2a8
+refs/heads/master: 0c5d1eb77a8be917b638344a22afe1398236482b
diff --git a/trunk/kernel/irq/chip.c b/trunk/kernel/irq/chip.c
index d663338cb4a8..5203a599d211 100644
--- a/trunk/kernel/irq/chip.c
+++ b/trunk/kernel/irq/chip.c
@@ -111,9 +111,9 @@ int set_irq_chip(unsigned int irq, struct irq_chip *chip)
 EXPORT_SYMBOL(set_irq_chip);
 
 /**
- *	set_irq_type - set the irq type for an irq
+ *	set_irq_type - set the irq trigger type for an irq
  *	@irq:	irq number
- *	@type:	interrupt type - see include/linux/interrupt.h
+ *	@type:	IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
  */
 int set_irq_type(unsigned int irq, unsigned int type)
 {
@@ -127,11 +127,12 @@ int set_irq_type(unsigned int irq, unsigned int type)
 	}
 
 	desc = irq_desc + irq;
-	if (desc->chip->set_type) {
-		spin_lock_irqsave(&desc->lock, flags);
-		ret = desc->chip->set_type(irq, type);
-		spin_unlock_irqrestore(&desc->lock, flags);
-	}
+	if (type == IRQ_TYPE_NONE)
+		return 0;
+
+	spin_lock_irqsave(&desc->lock, flags);
+	ret = __irq_set_trigger(desc, irq, flags);
+	spin_unlock_irqrestore(&desc->lock, flags);
 	return ret;
 }
 EXPORT_SYMBOL(set_irq_type);
diff --git a/trunk/kernel/irq/internals.h b/trunk/kernel/irq/internals.h
index 08a849a22447..422dd00c8bd3 100644
--- a/trunk/kernel/irq/internals.h
+++ b/trunk/kernel/irq/internals.h
@@ -10,6 +10,9 @@ extern void irq_chip_set_defaults(struct irq_chip *chip);
 /* Set default handler: */
 extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
 
+extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
+		unsigned long flags);
+
 #ifdef CONFIG_PROC_FS
 extern void register_irq_proc(unsigned int irq);
 extern void register_handler_proc(unsigned int irq, struct irqaction *action);
diff --git a/trunk/kernel/irq/manage.c b/trunk/kernel/irq/manage.c
index d62f69ba7453..e59157b591f8 100644
--- a/trunk/kernel/irq/manage.c
+++ b/trunk/kernel/irq/manage.c
@@ -216,7 +216,7 @@ void enable_irq(unsigned int irq)
 }
 EXPORT_SYMBOL(enable_irq);
 
-int set_irq_wake_real(unsigned int irq, unsigned int on)
+static int set_irq_wake_real(unsigned int irq, unsigned int on)
 {
 	struct irq_desc *desc = irq_desc + irq;
 	int ret = -ENXIO;
@@ -305,10 +305,11 @@ void compat_irq_chip_set_default_handler(struct irq_desc *desc)
 		desc->handle_irq = NULL;
 }
 
-static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
+int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 		unsigned long flags)
 {
 	int ret;
+	struct irq_chip *chip = desc->chip;
 
 	if (!chip || !chip->set_type) {
 		/*
@@ -326,6 +327,11 @@ static int __irq_set_trigger(struct irq_chip *chip, unsigned int irq,
 		pr_err("setting trigger mode %d for irq %u failed (%pF)\n",
 				(int)(flags & IRQF_TRIGGER_MASK),
 				irq, chip->set_type);
+	else {
+		/* note that IRQF_TRIGGER_MASK == IRQ_TYPE_SENSE_MASK */
+		desc->status &= ~IRQ_TYPE_SENSE_MASK;
+		desc->status |= flags & IRQ_TYPE_SENSE_MASK;
+	}
 
 	return ret;
 }
@@ -404,7 +410,7 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 
 		/* Setup the type (level, edge polarity) if configured: */
 		if (new->flags & IRQF_TRIGGER_MASK) {
-			ret = __irq_set_trigger(desc->chip, irq, new->flags);
+			ret = __irq_set_trigger(desc, irq, new->flags);
 
 			if (ret) {
 				spin_unlock_irqrestore(&desc->lock, flags);
@@ -430,6 +436,14 @@ int setup_irq(unsigned int irq, struct irqaction *new)
 
 		/* Set default affinity mask once everything is setup */
 		irq_select_affinity(irq);
+
+	} else if ((new->flags & IRQF_TRIGGER_MASK)
+			&& (new->flags & IRQF_TRIGGER_MASK)
+				!= (desc->status & IRQ_TYPE_SENSE_MASK)) {
+		/* hope the handler works with the actual trigger mode... */
+		pr_warning("IRQ %d uses trigger mode %d; requested %d\n",
+				irq, (int)(desc->status & IRQ_TYPE_SENSE_MASK),
+				(int)(new->flags & IRQF_TRIGGER_MASK));
 	}
 
 	*p = new;
@@ -586,6 +600,7 @@ EXPORT_SYMBOL(free_irq);
  *	IRQF_SHARED		Interrupt is shared
  *	IRQF_DISABLED	Disable local interrupts while processing
  *	IRQF_SAMPLE_RANDOM	The interrupt can be used for entropy
+ *	IRQF_TRIGGER_*		Specify active edge(s) or level
  *
  */
 int request_irq(unsigned int irq, irq_handler_t handler,