From 253f8e4152b6c36b87756bb23b16512c3abf7cb8 Mon Sep 17 00:00:00 2001
From: Peter Hutterer <peter.hutterer@who-t.net>
Date: Fri, 24 Jul 2015 11:13:41 +1000
Subject: [PATCH libinput] touchpad: serial synaptics need to fake new touches
 on TRIPLETAP

On the 4.1 kernels synaptics pretends to have 3 slots (the serial fw only does
2). This was added to avoid cursor jumps but has since been reverted for 4.2
(kernel commit dbf3c37086, 4.1.3 is still buggy). In some cases a TRIPLETAP
may be triggered without slot 2 ever activating.

While there are still those kernels out there, work around this bug by opening
a new touch point where none exists if the fake finger count exceeds the slot
count.

Reported-by: Jan Alexander Steffens <jan.steffens@gmail.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Tested-by: Jan Alexander Steffens <jan.steffens@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
---
 src/evdev-mt-touchpad.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/src/evdev-mt-touchpad.c b/src/evdev-mt-touchpad.c
index a683d9a..5ef03d5 100644
--- a/src/evdev-mt-touchpad.c
+++ b/src/evdev-mt-touchpad.c
@@ -369,13 +369,23 @@ tp_restore_synaptics_touches(struct tp_dispatch *tp,
 	for (i = 0; i < tp->num_slots; i++) {
 		struct tp_touch *t = tp_get_touch(tp, i);
 
-		if (t->state != TOUCH_END)
+		switch(t->state) {
+		case TOUCH_HOVERING:
+		case TOUCH_BEGIN:
+		case TOUCH_UPDATE:
 			continue;
-
-		/* new touch, move it through begin to update immediately */
-		tp_new_touch(tp, t, time);
-		tp_begin_touch(tp, t, time);
-		t->state = TOUCH_UPDATE;
+		case TOUCH_NONE:
+			/* new touch, move it through to begin immediately */
+			tp_new_touch(tp, t, time);
+			tp_begin_touch(tp, t, time);
+			break;
+		case TOUCH_END:
+			/* touch just ended ,we need need to restore it to update */
+			tp_new_touch(tp, t, time);
+			tp_begin_touch(tp, t, time);
+			t->state = TOUCH_UPDATE;
+			break;
+		}
 	}
 }
 
-- 
2.4.3