Input: atmel_mxt_ts - implement T9 vector/orientation support

The atmel touch messages contain orientation information as a byte in a
packed format which can be passed straight on to Android if the input
device configuration is correct.

This requires vector reports to be enabled in maXTouch config (zero
DISVECT bit 3 in T9 CTRL field)

Android converts the format in InputReader.cpp, search for
ORIENTATION_CALIBRATION_VECTOR.

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

@@ -746,6 +746,7 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 	int y;
 	int area;
 	int amplitude;
+	u8 vector;
 
 	id = message[0] - data->T9_reportid_min;
 	status = message[1];
@@ -760,9 +761,10 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 
 	area = message[5];
 	amplitude = message[6];
+	vector = message[7];
 
 	dev_dbg(dev,
-		"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
+		"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u vector: %02X\n",
 		id,
 		(status & MXT_T9_DETECT) ? 'D' : '.',
 		(status & MXT_T9_PRESS) ? 'P' : '.',
@@ -772,7 +774,7 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 		(status & MXT_T9_AMP) ? 'A' : '.',
 		(status & MXT_T9_SUPPRESS) ? 'S' : '.',
 		(status & MXT_T9_UNGRIP) ? 'U' : '.',
-		x, y, area, amplitude);
+		x, y, area, amplitude, vector);
 
 	input_mt_slot(input_dev, id);
 
@@ -794,6 +796,7 @@ static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
 		input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);
 		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
+		input_report_abs(input_dev, ABS_MT_ORIENTATION, vector);
 	} else {
 		/* Touch no longer active, close out slot */
 		input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 0);
@@ -2076,8 +2079,9 @@ static int mxt_initialize_input_device(struct mxt_data *data)
 				     0, 255, 0, 0);
 	}
 
-	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
-	    data->t100_aux_vect) {
+	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
+	    (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
+	    data->t100_aux_vect)) {
 		input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
 				     0, 255, 0, 0);
 	}