HID: hid-mulitouch: add support for the 'Sensing Win7-TwoFinger'

Added support for the 'Sensing Win7-TwoFinger' panel by GeneralTouch found on some tablets.

Because of conflicting VID/PID, this conflicts with previous support for some
single-touch panels by GeneralTouch
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Signed-off-by: Stéphane Chatty <chatty@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -294,6 +294,7 @@ config HID_MULTITOUCH
 	  Say Y here if you have one of the following devices:
 	  - PixCir touchscreen
 	  - Cypress TrueTouch
+	  - 'Sensing Win7-TwoFinger' panel by GeneralTouch
 
 config HID_NTRIG
 	tristate "N-Trig touch screen"

drivers/hid/hid-core.c

@@ -1309,6 +1309,7 @@ static const struct hid_device_id hid_blacklist[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PSX_ADAPTOR) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GAMERON, USB_DEVICE_ID_GAMERON_DUAL_PCS_ADAPTOR) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0003) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE) },
@@ -1614,7 +1615,6 @@ static const struct hid_device_id hid_ignore_list[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ESSENTIAL_REALITY, USB_DEVICE_ID_ESSENTIAL_REALITY_P5) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ETT, USB_DEVICE_ID_TC5UH) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_ETT, USB_DEVICE_ID_TC4UM) },
-	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0001) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0002) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0003) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH, 0x0004) },

drivers/hid/hid-ids.h

@@ -228,6 +228,7 @@
 #define USB_DEVICE_ID_GAMERON_DUAL_PCS_ADAPTOR	0x0002
 
 #define USB_VENDOR_ID_GENERAL_TOUCH	0x0dfc
+#define USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS 0x0001
 
 #define USB_VENDOR_ID_GLAB		0x06c2
 #define USB_DEVICE_ID_4_PHIDGETSERVO_30	0x0038

drivers/hid/hid-multitouch.c

@@ -33,6 +33,7 @@ MODULE_LICENSE("GPL");
 #define MT_QUIRK_NOT_SEEN_MEANS_UP	(1 << 0)
 #define MT_QUIRK_SLOT_IS_CONTACTID	(1 << 1)
 #define MT_QUIRK_CYPRESS	(1 << 2)
+#define MT_QUIRK_SLOT_IS_CONTACTNUMBER	(1 << 3)
 
 struct mt_slot {
 	__s32 x, y, p, w, h;
@@ -63,7 +64,8 @@ struct mt_class {
 /* classes of device behavior */
 #define MT_CLS_DEFAULT 0
 #define MT_CLS_DUAL1 1
-#define MT_CLS_CYPRESS 2
+#define MT_CLS_DUAL2 2
+#define MT_CLS_CYPRESS 3
 
 /*
  * these device-dependent functions determine what slot corresponds
@@ -75,6 +77,11 @@ static int slot_is_contactid(struct mt_device *td)
 	return td->curdata.contactid;
 }
 
+static int slot_is_contactnumber(struct mt_device *td)
+{
+	return td->num_received;
+}
+
 static int cypress_compute_slot(struct mt_device *td)
 {
 	if (td->curdata.contactid != 0 || td->num_received == 0)
@@ -105,6 +112,7 @@ static int find_slot_from_contactid(struct mt_device *td)
 struct mt_class mt_classes[] = {
 	{ 0, 0, 0, 10 },                             /* MT_CLS_DEFAULT */
 	{ MT_QUIRK_SLOT_IS_CONTACTID, 0, 0, 2 },     /* MT_CLS_DUAL1 */
+	{ MT_QUIRK_SLOT_IS_CONTACTNUMBER, 0, 0, 10 },    /* MT_CLS_DUAL2 */
 	{ MT_QUIRK_CYPRESS | MT_QUIRK_NOT_SEEN_MEANS_UP, 0, 0, 10 }, /* MT_CLS_CYPRESS */
 };
 
@@ -237,6 +245,9 @@ static int mt_compute_slot(struct mt_device *td)
 	if (cls->quirks & MT_QUIRK_CYPRESS)
 		return cypress_compute_slot(td);
 
+	if (cls->quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
+		return slot_is_contactnumber(td);
+
 	return find_slot_from_contactid(td);
 }
 
@@ -441,6 +452,11 @@ static const struct hid_device_id mt_devices[] = {
 		HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
 			USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
 
+	/* GeneralTouch panel */
+	{ .driver_data = MT_CLS_DUAL2,
+		HID_USB_DEVICE(USB_VENDOR_ID_GENERAL_TOUCH,
+			USB_DEVICE_ID_GENERAL_TOUCH_WIN7_TWOFINGERS) },
+
 	/* PixCir-based panels */
 	{ .driver_data = MT_CLS_DUAL1,
 		HID_USB_DEVICE(USB_VENDOR_ID_HANVON,