usb: gadget: goku_udc: add goku_match_ep() function

Add 'match_ep' callback to utilize chip-specific knowledge in endpoint matching
process. Function does the same that was done by chip-specific code inside
of epautoconf. Now this code can be removed from there to separate generic code
from platform specific logic.

[ [e-mail] : fix build breakage ]

Signed-off-by: Robert Baldyga <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/gadget/epautoconf.c

···
 	/* First, apply chip-specific "best usage" knowledge.
 	 * This might make a good usb_gadget_ops hook ...
 	 */
-	if (gadget_is_goku(gadget)) {
-		if (USB_ENDPOINT_XFER_INT == type) {
-			/* single buffering is enough */
-			ep = gadget_find_ep_by_name(gadget, "ep3-bulk");
-			if (ep && usb_gadget_ep_match_desc(gadget,
-					ep, desc, ep_comp))
-				goto found_ep;
-		} else if (USB_ENDPOINT_XFER_BULK == type
-				&& (USB_DIR_IN & desc->bEndpointAddress)) {
-			/* DMA may be available */
-			ep = gadget_find_ep_by_name(gadget, "ep2-bulk");
-			if (ep && usb_gadget_ep_match_desc(gadget,
-					ep, desc, ep_comp))
-				goto found_ep;
-		}
-
 #ifdef CONFIG_BLACKFIN
-	} else if (gadget_is_musbhdrc(gadget)) {
+	if (gadget_is_musbhdrc(gadget)) {
 		if ((USB_ENDPOINT_XFER_BULK == type) ||
 		    (USB_ENDPOINT_XFER_ISOC == type)) {
 			if (USB_DIR_IN & desc->bEndpointAddress)
···
 			ep = NULL;
 		if (ep && usb_gadget_ep_match_desc(gadget, ep, desc, ep_comp))
 			goto found_ep;
-#endif
 	}
+#endif
 
 	/* Second, look at endpoints until an unclaimed one looks usable */
 	list_for_each_entry (ep, &gadget->ep_list, ep_list) {

drivers/usb/gadget/udc/goku_udc.c

···
 	return -EOPNOTSUPP;
 }
 
+static struct usb_ep *goku_match_ep(struct usb_gadget *g,
+		struct usb_endpoint_descriptor *desc,
+		struct usb_ss_ep_comp_descriptor *ep_comp)
+{
+	struct goku_udc	*dev = to_goku_udc(g);
+	struct usb_ep *ep;
+
+	switch (usb_endpoint_type(desc)) {
+	case USB_ENDPOINT_XFER_INT:
+		/* single buffering is enough */
+		ep = &dev->ep[3].ep;
+		if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp))
+			return ep;
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		if (usb_endpoint_dir_in(desc)) {
+			/* DMA may be available */
+			ep = &dev->ep[2].ep;
+			if (usb_gadget_ep_match_desc(g, ep, desc, ep_comp))
+				return ep;
+		}
+		break;
+	default:
+		/* nothing */ ;
+	}
+
+	return NULL;
+}
+
 static int goku_udc_start(struct usb_gadget *g,
 		struct usb_gadget_driver *driver);
 static int goku_udc_stop(struct usb_gadget *g);
···
 	.get_frame	= goku_get_frame,
 	.udc_start	= goku_udc_start,
 	.udc_stop	= goku_udc_stop,
+	.match_ep	= goku_match_ep,
 	// no remote wakeup
 	// not selfpowered
 };