From d27eb7931c98a1ebfc9b2fcc48939846bcbfc804 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Thu, 18 Dec 2014 09:55:14 -0800 Subject: [PATCH] Input: alps - v7: fix finger counting for > 2 fingers on clickpads 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 Tested-by: Benjamin Tissoires Signed-off-by: Dmitry Torokhov --- 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 bfa62a63942f..b48c6fb317ed 100644 --- a/drivers/input/mouse/alps.c +++ b/drivers/input/mouse/alps.c @@ -933,6 +933,7 @@ 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); @@ -963,15 +964,22 @@ 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;