From 3587c258078479824342f33dc513ca7c66d729bc Mon Sep 17 00:00:00 2001
From: "Mark F. Brown" <mark.brown314@gmail.com>
Date: Fri, 3 Sep 2010 18:28:09 -0400
Subject: ARM: pxa27x_keypad: added wakeup event handler for keypad interrupts

mach-mmp needs to clear wake event in order to clear the keypad interrupt

Signed-off-by: Mark F. Brown <mark.brown314@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

diff --git a/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h b/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h
index 7b4eadc..abcc36e 100644
--- a/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h
+++ b/arch/arm/plat-pxa/include/plat/pxa27x_keypad.h
@@ -25,6 +25,13 @@
  *
  * 4. matrix key and direct key will use the same debounce_interval by
  *    default, which should be sufficient in most cases
+ *
+ * pxa168 keypad platform specific parameter
+ *
+ * NOTE:
+ * clear_wakeup_event callback is a workaround required to clear the
+ * keypad interrupt. The keypad wake must be cleared in addition to
+ * reading the MI/DI bits in the KPC register.
  */
 struct pxa27x_keypad_platform_data {
 
@@ -52,6 +59,9 @@ struct pxa27x_keypad_platform_data {
 
 	/* key debounce interval */
 	unsigned int	debounce_interval;
+
+	/* clear wakeup event requirement for pxa168 */
+	void		(*clear_wakeup_event)(void);
 };
 
 extern void pxa_set_keypad_info(struct pxa27x_keypad_platform_data *info);
diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
index 731bd88..4b0ec35 100644
--- a/drivers/input/keyboard/pxa27x_keypad.c
+++ b/drivers/input/keyboard/pxa27x_keypad.c
@@ -330,11 +330,21 @@ static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
 	keypad->direct_key_state = new_state;
 }
 
+static void clear_wakeup_event(struct pxa27x_keypad *keypad)
+{
+	struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+
+	if (pdata->clear_wakeup_event)
+		(pdata->clear_wakeup_event)();
+}
+
 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
 {
 	struct pxa27x_keypad *keypad = dev_id;
 	unsigned long kpc = keypad_readl(KPC);
 
+	clear_wakeup_event(keypad);
+
 	if (kpc & KPC_DI)
 		pxa27x_keypad_scan_direct(keypad);
 
-- 
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