Input: pxa27x_keypad direct key may be low active

KPDK_DK only indicates the pin level of direct key.
So it is related to board, and low level may be active which
indicates that a key is pressed.
Signed-off-by: NChao Xie <chao.xie@marvell.com>
Signed-off-by: NHaojian Zhuang <haojian.zhuang@gmail.com>

arch/arm/plat-pxa/include/plat/pxa27x_keypad.h

@@ -44,6 +44,8 @@ struct pxa27x_keypad_platform_data {
 	/* direct keys */
 	int		direct_key_num;
 	unsigned int	direct_key_map[MAX_DIRECT_KEY_NUM];
+	/* the key output may be low active */
+	int		direct_key_low_active;
 
 	/* rotary encoders 0 */
 	int		enable_rotary0;

drivers/input/keyboard/pxa27x_keypad.c

@@ -311,7 +311,15 @@ static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
 	if (pdata->enable_rotary0 || pdata->enable_rotary1)
 		pxa27x_keypad_scan_rotary(keypad);
 
-	new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
+	/*
+	 * The KPDR_DK only output the key pin level, so it relates to board,
+	 * and low level may be active.
+	 */
+	if (pdata->direct_key_low_active)
+		new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
+	else
+		new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
+
 	bits_changed = keypad->direct_key_state ^ new_state;
 
 	if (bits_changed == 0)