Input: wacom - support one finger touch the touchscreen way

There are two types of 1FGT devices supported in wacom_wac.c.
Changing them to follow the existing touchscreen format, i.e.,
only report BTN_TOUCH as a valid tool type.

Touch data will be ignored if pen is in proximity. This requires
a touch up event sent if touch was down when pen comes in. The
touch up event should be sent before any pen events are emitted.
Otherwise, two pointers would race for the cursor.

However, we can not send a touch up inside wacom_tpc_pen since
pen and touch are on different logical port. That is why we
have to check if touch is up before sending pen events.
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Reviewed-by: Chris Bagwell <chris@cnpbagwell.com>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/tablet/wacom_wac.c

@@ -675,51 +675,37 @@ static int wacom_intuos_irq(struct wacom_wac *wacom)
 	return 1;
 }
 
-static void wacom_tpc_touch_out(struct wacom_wac *wacom, int idx)
-{
-	struct input_dev *input = wacom->input;
-	int finger = idx + 1;
-
-	input_report_abs(input, ABS_X, 0);
-	input_report_abs(input, ABS_Y, 0);
-	input_report_abs(input, ABS_MISC, 0);
-	input_report_key(input, wacom->tool[finger], 0);
-	if (!idx)
-		input_report_key(input, BTN_TOUCH, 0);
-	input_event(input, EV_MSC, MSC_SERIAL, finger);
-	input_sync(input);
-}
-
-static void wacom_tpc_touch_in(struct wacom_wac *wacom, size_t len)
+static int wacom_tpc_single_touch(struct wacom_wac *wacom, size_t len)
 {
 	char *data = wacom->data;
 	struct input_dev *input = wacom->input;
+	bool prox;
+	int x = 0, y = 0;
 
-	wacom->tool[1] = BTN_TOOL_DOUBLETAP;
-	wacom->id[0] = TOUCH_DEVICE_ID;
+	if (!wacom->shared->stylus_in_proximity) {
+		if (len == WACOM_PKGLEN_TPC1FG) {
+			prox = data[0] & 0x01;
+			x = get_unaligned_le16(&data[1]);
+			y = get_unaligned_le16(&data[3]);
+		} else { /* with capacity */
+			prox = data[1] & 0x01;
+			x = le16_to_cpup((__le16 *)&data[2]);
+			y = le16_to_cpup((__le16 *)&data[4]);
+		}
+	} else
+		/* force touch out when pen is in prox */
+		prox = 0;
 
-	if (len != WACOM_PKGLEN_TPC1FG) {
+	if (prox) {
+		input_report_abs(input, ABS_X, x);
+		input_report_abs(input, ABS_Y, y);
+	}
+	input_report_key(input, BTN_TOUCH, prox);
 
-		switch (data[0]) {
+	/* keep touch state for pen events */
+	wacom->shared->touch_down = prox;
 
-		case WACOM_REPORT_TPC1FG:
-			input_report_abs(input, ABS_X, le16_to_cpup((__le16 *)&data[2]));
-			input_report_abs(input, ABS_Y, le16_to_cpup((__le16 *)&data[4]));
-			input_report_abs(input, ABS_PRESSURE, le16_to_cpup((__le16 *)&data[6]));
-			input_report_key(input, BTN_TOUCH, le16_to_cpup((__le16 *)&data[6]));
-			input_report_abs(input, ABS_MISC, wacom->id[0]);
-			input_report_key(input, wacom->tool[1], 1);
-			input_sync(input);
-			break;
-		}
-	} else {
-		input_report_abs(input, ABS_X, get_unaligned_le16(&data[1]));
-		input_report_abs(input, ABS_Y, get_unaligned_le16(&data[3]));
-		input_report_key(input, BTN_TOUCH, 1);
-		input_report_abs(input, ABS_MISC, wacom->id[1]);
-		input_report_key(input, wacom->tool[1], 1);
-		input_sync(input);
-	}
+	return 1;
 }
 
 static int wacom_tpc_pen(struct wacom_wac *wacom)
@@ -727,20 +713,18 @@ static int wacom_tpc_pen(struct wacom_wac *wacom)
 	struct wacom_features *features = &wacom->features;
 	char *data = wacom->data;
 	struct input_dev *input = wacom->input;
-	int prox, pressure;
-
-	prox = data[1] & 0x20;
+	int pressure;
+	bool prox = data[1] & 0x20;
 
-	if (!wacom->shared->stylus_in_proximity) { /* first in prox */
+	if (!wacom->shared->stylus_in_proximity) /* first in prox */
 		/* Going into proximity select tool */
 		wacom->tool[0] = (data[1] & 0x0c) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
-		if (wacom->tool[0] == BTN_TOOL_PEN)
-			wacom->id[0] = STYLUS_DEVICE_ID;
-		else
-			wacom->id[0] = ERASER_DEVICE_ID;
 
-		wacom->shared->stylus_in_proximity = true;
-	}
+	/* keep pen state for touch events */
+	wacom->shared->stylus_in_proximity = prox;
+
+	/* send pen events only when touch is up or forced out */
+	if (!wacom->shared->touch_down) {
 		input_report_key(input, BTN_STYLUS, data[1] & 0x02);
 		input_report_key(input, BTN_STYLUS2, data[1] & 0x10);
 		input_report_abs(input, ABS_X, le16_to_cpup((__le16 *)&data[2]));
@@ -750,48 +734,22 @@ static int wacom_tpc_pen(struct wacom_wac *wacom)
 			pressure = features->pressure_max + pressure + 1;
 		input_report_abs(input, ABS_PRESSURE, pressure);
 		input_report_key(input, BTN_TOUCH, data[1] & 0x05);
-	if (!prox) { /* out-prox */
-		wacom->id[0] = 0;
-		wacom->shared->stylus_in_proximity = false;
-	}
 		input_report_key(input, wacom->tool[0], prox);
-
 		return 1;
+	}
+
+	return 0;
 }
 
 static int wacom_tpc_irq(struct wacom_wac *wacom, size_t len)
 {
 	char *data = wacom->data;
-	int prox = 0;
 
 	dbg("wacom_tpc_irq: received report #%d", data[0]);
 
-	if (len == WACOM_PKGLEN_TPC1FG ||
-	    data[0] == WACOM_REPORT_TPC1FG) {	/* single touch */
-
-		if (wacom->shared->stylus_in_proximity) {
-			if (wacom->id[1] & 0x01)
-				wacom_tpc_touch_out(wacom, 0);
-
-			wacom->id[1] = 0;
-			return 0;
-		}
-
-		if (len == WACOM_PKGLEN_TPC1FG)
-			prox = data[0] & 0x01;
-		else  /* with capacity */
-			prox = data[1] & 0x01;
-
-		if (prox)
-			wacom_tpc_touch_in(wacom, len);
-		else {
-			wacom_tpc_touch_out(wacom, 0);
-
-			wacom->id[0] = 0;
-		}
-		/* keep prox bit to send proper out-prox event */
-		wacom->id[1] = prox;
-	} else if (data[0] == WACOM_REPORT_PENABLED)
+	if (len == WACOM_PKGLEN_TPC1FG || data[0] == WACOM_REPORT_TPC1FG)
+		return wacom_tpc_single_touch(wacom, len);
+	else if (data[0] == WACOM_REPORT_PENABLED)
 		return wacom_tpc_pen(wacom);
 
 	return 0;
@@ -1172,6 +1130,8 @@ void wacom_setup_input_capabilities(struct input_dev *input_dev,
 		/* fall through */
 
 	case TABLETPC:
+		__clear_bit(ABS_MISC, input_dev->absbit);
+
 		if (features->device_type == BTN_TOOL_DOUBLETAP ||
 		    features->device_type == BTN_TOOL_TRIPLETAP) {
 			input_abs_set_res(input_dev, ABS_X,
@@ -1180,7 +1140,6 @@ void wacom_setup_input_capabilities(struct input_dev *input_dev,
 			input_abs_set_res(input_dev, ABS_Y,
 				wacom_calculate_touch_res(features->y_max,
 							features->y_phy));
-			__set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);
 		}
 
 		if (features->device_type != BTN_TOOL_PEN)

drivers/input/tablet/wacom_wac.h

@@ -88,6 +88,7 @@ struct wacom_features {
 
 struct wacom_shared {
 	bool stylus_in_proximity;
+	bool touch_down;
 };
 
 struct wacom_wac {