linux-kernel - [PATCH 3.13 39/46] Input: wacom - make sure touch

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Date:	Fri, 28 Mar 2014 10:32:23 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jason Gerecke <killertofu@...il.com>,
	Ping Cheng <pingc@...om.com>,
	Chris Bagwell <chris@...bagwell.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Josh Boyer <jwboyer@...oraproject.org>
Subject: [PATCH 3.13 39/46] Input: wacom - make sure touch_max is set for touch devices

3.13-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ping Cheng <pinglinux@...il.com>

commit 1d0d6df02750b4a6f466768cbfbf860e24f4c8d4 upstream.

Old single touch Tablet PCs do not have touch_max set at
wacom_features. Since touch device at lease supports one
finger, assign touch_max to 1 when touch usage is defined
in its HID Descriptor and touch_max is not pre-defined.

Tested-by: Jason Gerecke <killertofu@...il.com>
Signed-off-by: Ping Cheng <pingc@...om.com>
Reviewed-by: Chris Bagwell <chris@...bagwell.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Josh Boyer <jwboyer@...oraproject.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/tablet/wacom_sys.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -304,7 +304,7 @@ static int wacom_parse_hid(struct usb_in
 	struct usb_device *dev = interface_to_usbdev(intf);
 	char limit = 0;
 	/* result has to be defined as int for some devices */
-	int result = 0;
+	int result = 0, touch_max = 0;
 	int i = 0, usage = WCM_UNDEFINED, finger = 0, pen = 0;
 	unsigned char *report;
 
@@ -351,7 +351,8 @@ static int wacom_parse_hid(struct usb_in
 				if (usage == WCM_DESKTOP) {
 					if (finger) {
 						features->device_type = BTN_TOOL_FINGER;
-
+						/* touch device at least supports one touch point */
+						touch_max = 1;
 						switch (features->type) {
 						case TABLETPC2FG:
 							features->pktlen = WACOM_PKGLEN_TPC2FG;
@@ -504,6 +505,8 @@ static int wacom_parse_hid(struct usb_in
 	}
 
  out:
+	if (!features->touch_max && touch_max)
+		features->touch_max = touch_max;
 	result = 0;
 	kfree(report);
 	return result;


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