HID: hid-multitouch: add support for Cypress TrueTouch panels

Added support for Cypress TrueTouch panels, which detect up to 10 fingers
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

@@ -293,6 +293,7 @@ config HID_MULTITOUCH
 
 	  Say Y here if you have one of the following devices:
 	  - PixCir touchscreen
+	  - Cypress TrueTouch
 
 config HID_NTRIG
 	tristate "N-Trig touch screen"

drivers/hid/hid-core.c

@@ -1298,6 +1298,7 @@ static const struct hid_device_id hid_blacklist[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_DRAGONRISE, 0x0006) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_DWAV, USB_DEVICE_ID_DWAV_EGALAX_MULTITOUCH1) },

drivers/hid/hid-ids.h

@@ -180,6 +180,7 @@
 #define USB_DEVICE_ID_CYPRESS_BARCODE_1	0xde61
 #define USB_DEVICE_ID_CYPRESS_BARCODE_2	0xde64
 #define USB_DEVICE_ID_CYPRESS_BARCODE_3	0xbca1
+#define USB_DEVICE_ID_CYPRESS_TRUETOUCH	0xc001
 
 #define USB_VENDOR_ID_DEALEXTREAME	0x10c5
 #define USB_DEVICE_ID_DEALEXTREAME_RADIO_SI4701	0x819a

drivers/hid/hid-multitouch.c

@@ -32,6 +32,7 @@ MODULE_LICENSE("GPL");
 /* quirks to control the device */
 #define MT_QUIRK_NOT_SEEN_MEANS_UP	(1 << 0)
 #define MT_QUIRK_SLOT_IS_CONTACTID	(1 << 1)
+#define MT_QUIRK_CYPRESS	(1 << 2)
 
 struct mt_slot {
 	__s32 x, y, p, w, h;
@@ -62,6 +63,7 @@ struct mt_class {
 /* classes of device behavior */
 #define MT_CLS_DEFAULT 0
 #define MT_CLS_DUAL1 1
+#define MT_CLS_CYPRESS 2
 
 /*
  * these device-dependent functions determine what slot corresponds
@@ -73,6 +75,14 @@ static int slot_is_contactid(struct mt_device *td)
 	return td->curdata.contactid;
 }
 
+static int cypress_compute_slot(struct mt_device *td)
+{
+	if (td->curdata.contactid != 0 || td->num_received == 0)
+		return td->curdata.contactid;
+	else
+		return -1;
+}
+
 static int find_slot_from_contactid(struct mt_device *td)
 {
 	int i;
@@ -95,6 +105,7 @@ 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_CYPRESS | MT_QUIRK_NOT_SEEN_MEANS_UP, 0, 0, 10 }, /* MT_CLS_CYPRESS */
 };
 
 static void mt_feature_mapping(struct hid_device *hdev, struct hid_input *hi,
@@ -223,6 +234,9 @@ static int mt_compute_slot(struct mt_device *td)
 	if (cls->quirks & MT_QUIRK_SLOT_IS_CONTACTID)
 		return slot_is_contactid(td);
 
+	if (cls->quirks & MT_QUIRK_CYPRESS)
+		return cypress_compute_slot(td);
+
 	return find_slot_from_contactid(td);
 }
 
@@ -422,6 +436,11 @@ static void mt_remove(struct hid_device *hdev)
 
 static const struct hid_device_id mt_devices[] = {
 
+	/* Cypress panel */
+	{ .driver_data = MT_CLS_CYPRESS,
+		HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS,
+			USB_DEVICE_ID_CYPRESS_TRUETOUCH) },
+
 	/* PixCir-based panels */
 	{ .driver_data = MT_CLS_DUAL1,
 		HID_USB_DEVICE(USB_VENDOR_ID_HANVON,