From: Ping Cheng <pinglinux@gmail.com>
Date: Thu, 28 Jun 2012 23:47:30 +0000 (-0700)
Subject: Input: wacom - don't retrieve touch_max when it is predefined
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1cecc5cc0658e128bcad0b29edb96f286066571d;p=linux-beck.git

Input: wacom - don't retrieve touch_max when it is predefined

Some models, such as 0xE6, report more fingers than we process.

Reported-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Tested-by: Nils Kanning <nils@kanning.de>
Tested-by: Rafi Rubin <rafi@seas.upenn.edu>
Reviewed-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index 23a933da75cd..b145841bdbe7 100644
--- a/drivers/input/tablet/wacom_sys.c
+++ b/drivers/input/tablet/wacom_sys.c
@@ -398,7 +398,9 @@ static int wacom_parse_hid(struct usb_interface *intf,
 				break;
 
 			case HID_USAGE_CONTACTMAX:
-				wacom_retrieve_report_data(intf, features);
+				/* leave touch_max as is if predefined */
+				if (!features->touch_max)
+					wacom_retrieve_report_data(intf, features);
 				i++;
 				break;
 			}