Input: wacom - move Bamboo Touch irq to its own function

This is in preparation of pen support in same irq handler.
Signed-off-by: NChris Bagwell <chris@cnpbagwell.com>
Acked-by: NPing Cheng <pingc@wacom.com>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

drivers/input/tablet/wacom_wac.c

@@ -855,7 +855,7 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, size_t len)
 	return retval;
 }
 
-static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len)
+static int wacom_bpt_touch(struct wacom_wac *wacom)
 {
 	struct wacom_features *features = &wacom->features;
 	struct input_dev *input = wacom->input;
@@ -863,9 +863,6 @@ static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len)
 	int sp = 0, sx = 0, sy = 0, count = 0;
 	int i;
 
-	if (len != WACOM_PKGLEN_BBTOUCH)
-		return 0;
-
 	for (i = 0; i < 2; i++) {
 		int p = data[9 * i + 2];
 		input_mt_slot(input, i);
@@ -907,6 +904,14 @@ static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len)
 	return 0;
 }
 
+static int wacom_bpt_irq(struct wacom_wac *wacom, size_t len)
+{
+	if (len == WACOM_PKGLEN_BBTOUCH)
+		return wacom_bpt_touch(wacom);
+
+	return 0;
+}
+
 void wacom_wac_irq(struct wacom_wac *wacom_wac, size_t len)
 {
 	bool sync;