[PATCH 3/3] Input: synaptics - ignore bogus mt packet

["Henrik Rydberg" <rydberg@euromail.se>]

In multitouch mode, at least one device (fw: 7.4 id: 0x1c0b1) sometimes
sends a final main packet with x == 1. Since the normal values are above
1472, this is clearly bogus. At the same time, a two-finger touch is
signaled, even though only one finger was on the pad to begin with. This
patch ignores the packet altogether, removing the problem.

Acked-by: Chris Bagwell <chris@cnpbagwell.com>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
---
 drivers/input/mouse/synaptics.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 2f8a97a..ae85ab2 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -548,7 +548,7 @@ static void synaptics_process_packet(struct psmouse *psmouse)
 		return;
 	}
 
-	if (hw.z > 0) {
+	if (hw.z > 0 && hw.x > 1) {
 		num_fingers = 1;
 		finger_width = 5;
 		if (SYN_CAP_EXTENDED(priv->capabilities)) {
@@ -582,7 +582,7 @@ static void synaptics_process_packet(struct psmouse *psmouse)
 	if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
 	if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
 
-	if (hw.z > 0) {
+	if (num_fingers > 0) {
 		input_report_abs(dev, ABS_X, hw.x);
 		input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
 	}
-- 
1.7.2.3