- *x = ((pkt[0] & 0x1F) << 7) | (pkt[3] & 0x7F);
- *y = ((pkt[1] & 0x1F) << 7) | (pkt[4] & 0x7F);
- *press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);
- *touch = ~pkt[7] & 0x20;
+ int touch;
+ /*
+ * ITM devices report invalid x/y data if not touched.
+ * if the screen was touched before but is not touched any more
+ * report touch as 0 with the last valid x/y data once. then stop
+ * reporting data until touched again.
+ */
+ dev->press = ((pkt[2] & 0x01) << 7) | (pkt[5] & 0x7F);
+
+ touch = ~pkt[7] & 0x20;
+ if (!touch) {
+ if (dev->touch) {
+ dev->touch = 0;
+ return 1;
+ }