linux-kernel - [PATCH 4/5] ARM: pxa168: added special case handler for keypad interrupts

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Date:	Thu, 26 Aug 2010 05:18:58 -0400
From:	"Mark F. Brown" <mark.brown314@...il.com>
To:	Eric Miao <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	"Mark F. Brown" <mark.brown314@...il.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Cc:	"Mark F. Brown" <mark.brown314@...il.com>
Subject: [PATCH 4/5] ARM: pxa168: added special case handler for keypad interrupts

Signed-off-by: Mark F. Brown <mark.brown314@...il.com>
---
 arch/arm/mach-mmp/irq-pxa168.c |   23 ++++++++++++++++++++++-
 1 files changed, 22 insertions(+), 1 deletions(-)

diff --git a/arch/arm/mach-mmp/irq-pxa168.c b/arch/arm/mach-mmp/irq-pxa168.c
index 52ff2f0..bfb0984 100644
--- a/arch/arm/mach-mmp/irq-pxa168.c
+++ b/arch/arm/mach-mmp/irq-pxa168.c
@@ -17,6 +17,8 @@
 #include <linux/io.h>
 
 #include <mach/regs-icu.h>
+#include <mach/regs-apmu.h>
+#include <mach/cputype.h>
 
 #include "common.h"
 
@@ -42,6 +44,19 @@ static struct irq_chip icu_irq_chip = {
 	.unmask	= icu_unmask_irq,
 };
 
+void handle_pxa168_keypad_irq(unsigned int irq, struct irq_desc *desc)
+{
+	uint32_t val;
+	uint32_t mask = APMU_PXA168_KP_WAKE_CLR;
+
+	/* clear keypad wake event */
+	val = __raw_readl(APMU_WAKE_CLR);
+	__raw_writel(val |  mask, APMU_WAKE_CLR);
+
+	/* handle irq */
+	handle_level_irq(irq, desc);
+}
+
 void __init icu_init_irq(void)
 {
 	int irq;
@@ -49,7 +64,13 @@ void __init icu_init_irq(void)
 	for (irq = 0; irq < 64; irq++) {
 		icu_mask_irq(irq);
 		set_irq_chip(irq, &icu_irq_chip);
-		set_irq_handler(irq, handle_level_irq);
+
+		/* special handler for keypad */
+		if (cpu_is_pxa168() && irq == IRQ_PXA168_KEYPAD)
+			set_irq_handler(irq, handle_pxa168_keypad_irq);
+		else
+			set_irq_handler(irq, handle_level_irq);
+
 		set_irq_flags(irq, IRQF_VALID);
 	}
 }
-- 
1.7.0.4

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