can: gs_usb: add quirk for CANtact Pro overlapping GS_USB_BREQ value

For the GS_USB_BREQ_DATA_BITTIMING USB control message the CANtact Pro
firmware uses a request value, which is already used by the
candleLight firmware for a different
purpose (GS_USB_BREQ_GET_USER_ID).

This patch adds a quirk to use the CANtact Pro's value for the
GS_USB_BREQ_DATA_BITTIMING USB control message instead of the official
one.

Link: https://lore.kernel.org/all/20220309124132.291861-18-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/gs_usb.c

@@ -42,6 +42,7 @@ enum gs_usb_breq {
 	GS_USB_BREQ_TIMESTAMP,
 	GS_USB_BREQ_IDENTIFY,
 	GS_USB_BREQ_GET_USER_ID,
+	GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING = GS_USB_BREQ_GET_USER_ID,
 	GS_USB_BREQ_SET_USER_ID,
 	GS_USB_BREQ_DATA_BITTIMING,
 };
@@ -138,6 +139,13 @@ struct gs_identify_mode {
 #define GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX BIT(9)
 #define GS_CAN_FEATURE_MASK GENMASK(9, 0)
 
+/* internal quirks - keep in GS_CAN_FEATURE space for now */
+
+/* CANtact Pro original firmware:
+ * BREQ DATA_BITTIMING overlaps with GET_USER_ID
+ */
+#define GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO BIT(31)
+
 struct gs_device_bt_const {
 	__le32 feature;
 	__le32 fclk_can;
@@ -506,6 +514,7 @@ static int gs_usb_set_data_bittiming(struct net_device *netdev)
 	struct can_bittiming *bt = &dev->can.data_bittiming;
 	struct usb_interface *intf = dev->iface;
 	struct gs_device_bittiming *dbt;
+	u8 request = GS_USB_BREQ_DATA_BITTIMING;
 	int rc;
 
 	dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
@@ -518,10 +527,13 @@ static int gs_usb_set_data_bittiming(struct net_device *netdev)
 	dbt->sjw = cpu_to_le32(bt->sjw);
 	dbt->brp = cpu_to_le32(bt->brp);
 
+	if (dev->feature & GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO)
+		request = GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING;
+
 	/* request bit timings */
 	rc = usb_control_msg(interface_to_usbdev(intf),
 			     usb_sndctrlpipe(interface_to_usbdev(intf), 0),
-			     GS_USB_BREQ_DATA_BITTIMING,
+			     request,
 			     USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
 			     dev->channel, 0, dbt, sizeof(*dbt), 1000);