On Wed, October 5, 2016 2:35 am, Benjamin Tissoires wrote:

On Oct 04 2016 or thereabouts, Roderick Colenbrander wrote:

quoted

+		/*
+		 * The first 7 bits of the first byte is a counter and bit 8 is
+		 * a touch indicator that is 0 when pressed and 1 when not
+		 * pressed.
+		 * The next 3 bytes are two 12 bit touch coordinates, X and Y.
+		 * The data for the second touch is in the same format and
+		 * immediately follows the data for the first.
+		 */
+		for (n = 0; n < 2; n++) {
+			u16 x, y;
+			bool active;
+
+			x = rd[offset+1] | ((rd[offset+2] & 0xF) << 8);
+			y = ((rd[offset+2] & 0xF0) >> 4) | (rd[offset+3] << 4);
+
+			active = !(rd[offset] >> 7);
+			input_mt_slot(input_dev, n);

Just to be sure, the device reports 2 touches only, and the
"num_touch_data" chunks are just the history of these 2 touches, the
last chunk being the last known touches?

FYI - Community knowledge/understanding...
http://www.psdevwiki.com/ps4/DS4-BT#HID_INPUT_reports

Simon