Drop hack for drivers that emit zero ABS_MT_TOUCH_MAJOR.

Bug: 5064702

When using Linux MT Protocol A, drivers are supposed to omit
fingers that go up and to send an empty sync with no fingers
(can be just an SYN_MT_REPORT / SYN_REPORT) when no fingers
remain.

This makes Android more compliant with the protocol standard.

Change-Id: I5775feb14ab7db015824a32b1e2c015da239385d

diff --git a/services/input/InputReader.cpp b/services/input/InputReader.cpp
index c9fac81..3e041f3 100644 (file)
--- a/services/input/InputReader.cpp
+++ b/services/input/InputReader.cpp
@@ -5082,11 +5082,6 @@ void MultiTouchInputMapper::sync(nsecs_t when) {
         }
 
         if (fields & Accumulator::FIELD_ABS_MT_TOUCH_MAJOR) {
-            if (inSlot.absMTTouchMajor <= 0) {
-                // Some devices send sync packets with X / Y but with a 0 touch major to indicate
-                // a pointer going up.  Drop this finger.
-                continue;
-            }
             outPointer.touchMajor = inSlot.absMTTouchMajor;
         } else {
             // Default touch area to 0 if absent.