From: Ping Cheng <pinglinux@xxxxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
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@xxxxxxxxx>
Signed-off-by: Ping Cheng <pingc@xxxxxxxxx>
Reviewed-by: Chris Bagwell <chris@xxxxxxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/input/tablet/wacom_sys.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c
index e53416a4d7f3..a6debe13d5b9 100644
--- 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_interface *intf,
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_interface *intf,
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_interface *intf,
}
out:
+ if (!features->touch_max && touch_max)
+ features->touch_max = touch_max;
result = 0;
kfree(report);
return result;
--
1.9.1
--
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