Input: wacom - share pen info with touch of the same ID

Touch enbaled devices share the same product ID with pen. However,
we do not want to post touch events while pen is in prox. To do so,
we used to keep a local static variable to keep track of if pen is
in prox or not. This works fine for Tablet PC devices since there
is only one device attached. With the newer touch enabled regular
tablets, we can not make this assumption any more, i.e, one system
may have more than one identical tablet plugged in.

This patch adds an new entry, shared, into the struct wacom_wac so
touch data can access pen data to locally. This solution assumes
the two tools (touch and pen) of the same ID will be probed one
after the other without interruption in between by another Wacom
device of the same ID.

1 files changed, 12 insertions, 21 deletions

diff --git a/drivers/input/tablet/wacom_wac.c b/drivers/input/tablet/wacom_wac.c
index b3ba3437a2e..428144af865 100644
--- a/drivers/input/tablet/wacom_wac.c
+++ b/drivers/input/tablet/wacom_wac.c
@@ -688,7 +688,6 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, void *wcombo)
 	struct wacom_features *features = &wacom->features;
 	char *data = wacom->data;
 	int prox = 0, pressure, idx = -1;
-	static int stylusInProx, touchInProx = 1, touchOut;
 	struct urb *urb = ((struct wacom_combo *)wcombo)->urb;
 
 	dbg("wacom_tpc_irq: received report #%d", data[0]);
@@ -707,16 +706,12 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, void *wcombo)
 				prox = data[1] & 0x03;
 		}
 
-		if (!stylusInProx) { /* stylus not in prox */
+		if (!wacom->shared->stylus_in_proximity) {
 			if (prox) {
-				if (touchInProx) {
-					wacom_tpc_touch_in(wacom, wcombo);
-					touchOut = 1;
-					return 1;
-				}
+				wacom_tpc_touch_in(wacom, wcombo);
 			} else {
-				/* 2FGT out-prox */
 				if (data[0] == WACOM_REPORT_TPC2FG) {
+					/* 2FGT out-prox */
 					idx = (wacom->id[1] & 0x01) - 1;
 					if (idx == 0) {
 						wacom_tpc_touch_out(wacom, wcombo, idx);
@@ -727,23 +722,19 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, void *wcombo)
 					idx = (wacom->id[1] & 0x02) - 1;
 					if (idx == 1)
 						wacom_tpc_touch_out(wacom, wcombo, idx);
-				} else /* one finger touch */
+				} else {
+					/* one finger touch */
 					wacom_tpc_touch_out(wacom, wcombo, 0);
-				touchOut = 0;
-				touchInProx = 1;
-				return 1;
+				}
+				wacom->id[0] = 0;
 			}
-		} else if (touchOut || !prox) { /* force touch out-prox */
+		} else if (wacom->id[0]) { /* force touch out-prox */
 			wacom_tpc_touch_out(wacom, wcombo, 0);
-			touchOut = 0;
-			touchInProx = 1;
-			return 1;
 		}
+		return 1;
 	} else if (data[0] == WACOM_REPORT_PENABLED) { /* Penabled */
 		prox = data[1] & 0x20;
 
-		touchInProx = 0;
-
 		if (!wacom->id[0]) { /* first in prox */
 			/* Going into proximity select tool */
 			wacom->tool[0] = (data[1] & 0x0c) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
@@ -751,6 +742,8 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, void *wcombo)
 				wacom->id[0] = STYLUS_DEVICE_ID;
 			else
 				wacom->id[0] = ERASER_DEVICE_ID;
+
+			wacom->shared->stylus_in_proximity = true;
 		}
 		wacom_report_key(wcombo, BTN_STYLUS, data[1] & 0x02);
 		wacom_report_key(wcombo, BTN_STYLUS2, data[1] & 0x10);
@@ -763,12 +756,10 @@ static int wacom_tpc_irq(struct wacom_wac *wacom, void *wcombo)
 		wacom_report_key(wcombo, BTN_TOUCH, data[1] & 0x05);
 		if (!prox) { /* out-prox */
 			wacom->id[0] = 0;
-			/* pen is out so touch can be enabled now */
-			touchInProx = 1;
+			wacom->shared->stylus_in_proximity = false;
 		}
 		wacom_report_key(wcombo, wacom->tool[0], prox);
 		wacom_report_abs(wcombo, ABS_MISC, wacom->id[0]);
-		stylusInProx = prox;
 		return 1;
 	}
 	return 0;