Bluetooth: btusb: Add internal recv_event callback for event processing

Some new upcoming drivers need to process HCI events or take extra
actions based on them before handing the event to the Bluetooth core
for processing. The new recv_event callback allows exactly such an
internal behavior.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

drivers/bluetooth/btusb.c

@@ -309,6 +309,7 @@ struct btusb_data {
 	int isoc_altsetting;
 	int suspend_count;
 
+	int (*recv_event)(struct hci_dev *hdev, struct sk_buff *skb);
 	int (*recv_bulk)(struct btusb_data *data, void *buffer, int count);
 };
 
@@ -374,7 +375,7 @@ static int btusb_recv_intr(struct btusb_data *data, void *buffer, int count)
 
 		if (bt_cb(skb)->expect == 0) {
 			/* Complete frame */
-			hci_recv_frame(data->hdev, skb);
+			data->recv_event(data->hdev, skb);
 			skb = NULL;
 		}
 	}
@@ -2048,6 +2049,7 @@ static int btusb_probe(struct usb_interface *intf,
 	init_usb_anchor(&data->isoc_anchor);
 	spin_lock_init(&data->rxlock);
 
+	data->recv_event = hci_recv_frame;
 	data->recv_bulk = btusb_recv_bulk;
 
 	hdev = hci_alloc_dev();