mfd: dln2: Automatically detect and fill endpoint pointers

The usb_find_common_endpoints() finds and fills the endpoints
in accordance with their types. Use it to automatically detect
and fill endpoint pointers.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220617182338.32402-1-andriy.shevchenko@linux.intel.com

drivers/mfd/dln2.c

@@ -91,11 +91,6 @@ struct dln2_mod_rx_slots {
 	spinlock_t lock;
 };
 
-enum dln2_endpoint {
-	DLN2_EP_OUT	= 0,
-	DLN2_EP_IN	= 1,
-};
-
 struct dln2_dev {
 	struct usb_device *usb_dev;
 	struct usb_interface *interface;
@@ -777,16 +772,12 @@ static int dln2_probe(struct usb_interface *interface,
 	int ret;
 	int i, j;
 
-	if (hostif->desc.bInterfaceNumber != 0 ||
-	    hostif->desc.bNumEndpoints < 2)
+	if (hostif->desc.bInterfaceNumber != 0)
 		return -ENODEV;
 
-	epout = &hostif->endpoint[DLN2_EP_OUT].desc;
-	if (!usb_endpoint_is_bulk_out(epout))
-		return -ENODEV;
-	epin = &hostif->endpoint[DLN2_EP_IN].desc;
-	if (!usb_endpoint_is_bulk_in(epin))
-		return -ENODEV;
+	ret = usb_find_common_endpoints(hostif, &epin, &epout, NULL, NULL);
+	if (ret)
+		return ret;
 
 	dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL);
 	if (!dln2)