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Input: wacom - make sure touch_max is set for touch devices

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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@gmail.com>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Reviewed-by: Chris Bagwell <chris@cnpbagwell.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Ping Cheng 2013-11-25 18:43:45 -08:00 committed by Dmitry Torokhov
parent 0b279da7af
commit 1d0d6df027
1 changed files with 5 additions and 2 deletions
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7
drivers/input/tablet/wacom_sys.c
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@ -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;