HID: wacom - Cleanup touch arbitration logic

stylus_in_proximity was introduced to support touch arbitration
before in range was supported. With in range event, the logic
changed. stylus_in_proximity should be set for both in prox and
in range events.

To finish a clean touch arbitration logic, we should send touch
up (if it was down) before posting any general pen events.

Signed-off-by: Ping Cheng <[email protected]>
Reviewed-by: Jason Gerecke <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>

Author: Pinglinux

drivers/hid/wacom_wac.c

@@ -674,19 +674,22 @@ static int wacom_intuos_inout(struct wacom_wac *wacom)
 			wacom->tool[idx] = BTN_TOOL_PEN;
 			break;
 		}
+		wacom->shared->stylus_in_proximity = true;
 		return 1;
 	}
 
-	wacom->shared->stylus_in_proximity = true;
-	if (wacom->shared->touch_down)
-		return 1;
+	/* in Range */
+	if ((data[1] & 0xfe) == 0x20) {
+		wacom->shared->stylus_in_proximity = true;
 
-	/* in Range while exiting */
-	if (((data[1] & 0xfe) == 0x20) && wacom->reporting_data) {
-		input_report_key(input, BTN_TOUCH, 0);
-		input_report_abs(input, ABS_PRESSURE, 0);
-		input_report_abs(input, ABS_DISTANCE, wacom->features.distance_max);
-		return 2;
+		/* in Range while exiting */
+		if (wacom->reporting_data) {
+			input_report_key(input, BTN_TOUCH, 0);
+			input_report_abs(input, ABS_PRESSURE, 0);
+			input_report_abs(input, ABS_DISTANCE, wacom->features.distance_max);
+			return 2;
+		}
+		return 1;
 	}
 
 	/* Exit report */
@@ -871,6 +874,9 @@ static int wacom_intuos_general(struct wacom_wac *wacom)
 		data[0] != WACOM_REPORT_INTUOS_PEN)
 		return 0;
 
+	if (wacom->shared->touch_down)
+		return 1;
+
 	/* don't report events if we don't know the tool ID */
 	if (!wacom->id[idx]) {
 		/* but reschedule a read of the current tool */