[PATCH 4/4] alps: v7: Fix finger counting for > 2 fingers on clickpads

[Hans de Goede <hdegoede@redhat.com>]

Protocol v7 uses the middle / right button bits on clickpads to communicate
"location" information of a 3th touch (and possible 4th) touch on clickpads.

Specifically when 3 touches are down, if one of the 3 touches is in the
left / right button area, this will get reported in the middle / right button
bits and the touchpad will still send a TWO type packet rather then a MULTI
type packet, so when this happens we must add the finger reported in the
button area to the finger count.

Likewise we must also add fingers reported this way to the finger count
when we get MULTI packets.

BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=86338
Cc: stable@vger.kernel.org # 3.17
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/input/mouse/alps.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index 77c7afe..d88d73d 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -961,6 +961,7 @@ static int alps_decode_packet_v7(struct alps_fields *f,
 				  unsigned char *p,
 				  struct psmouse *psmouse)
 {
+	struct alps_data *priv = psmouse->private;
 	unsigned char pkt_id;
 
 	pkt_id = alps_get_packet_id_v7(p);
@@ -991,15 +992,22 @@ static int alps_decode_packet_v7(struct alps_fields *f,
 
 	alps_get_finger_coordinate_v7(f->mt, p, pkt_id);
 
-	f->left = (p[0] & 0x80) >> 7;
-	f->right = (p[0] & 0x20) >> 5;
-	f->middle = (p[0] & 0x10) >> 4;
-
 	if (pkt_id == V7_PACKET_ID_TWO)
 		f->fingers = alps_get_mt_count(f->mt);
 	else /* pkt_id == V7_PACKET_ID_MULTI */
 		f->fingers = 3 + (p[5] & 0x03);
 
+	f->left = (p[0] & 0x80) >> 7;
+	if (priv->flags & ALPS_BUTTONPAD) {
+		if (p[0] & 0x20)
+			f->fingers++;
+		if (p[0] & 0x10)
+			f->fingers++;
+	} else {
+		f->right = (p[0] & 0x20) >> 5;
+		f->middle = (p[0] & 0x10) >> 4;
+	}
+
 	/* Sometimes a single touch is reported in mt[1] rather then mt[0] */
 	if (f->fingers == 1 && f->mt[0].x == 0 && f->mt[0].y == 0) {
 		f->mt[0].x = f->mt[1].x;
-- 
2.1.0