Input: atmel_mxt_ts - handle reports from T47 Stylus object

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Acked-by: Benson Leung <bleung@chromium.org>
Acked-by: Yufeng Shen <miletus@chromium.org>

drivers/input/touchscreen/atmel_mxt_ts.c

@@ -750,6 +750,7 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 	int area;
 	int amplitude;
 	u8 vector;
+	int tool;
 
 	id = message[0] - data->T9_reportid_min;
 	status = message[1];
@@ -763,6 +764,7 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 		y >>= 2;
 
 	area = message[5];
+
 	amplitude = message[6];
 	vector = message[7];
 
@@ -793,8 +795,16 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 			mxt_input_sync(data);
 		}
 
+		/* A size of zero indicates touch is from a linked T47 Stylus */
+		if (area == 0) {
+			area = MXT_TOUCH_MAJOR_DEFAULT;
+			tool = MT_TOOL_PEN;
+		} else {
+			tool = MT_TOOL_FINGER;
+		}
+
 		/* Touch active */
-		input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1);
+		input_mt_report_slot_state(input_dev, tool, 1);
 		input_report_abs(input_dev, ABS_MT_POSITION_X, x);
 		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
 		input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);