Bluetooth: btusb: add callback function in btusb suspend/resume

Add suspend/resum callback function in btusb_data which are reserved
for vendor specific usage during suspend/resume. hdev->suspend will be
added before stop traffic in btusb_suspend and hdev-> resume will be
added after resubmit urb in btusb_resume.
Signed-off-by: Chris Lu <chris.lu@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

drivers/bluetooth/btusb.c

@@ -895,6 +895,9 @@ struct btusb_data {
 
 	int (*setup_on_usb)(struct hci_dev *hdev);
 
+	int (*suspend)(struct hci_dev *hdev);
+	int (*resume)(struct hci_dev *hdev);
+
 	int oob_wake_irq;   /* irq for out-of-band wake-on-bt */
 	unsigned cmd_timeout_cnt;
 
@@ -4769,6 +4772,9 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
 
 	cancel_work_sync(&data->work);
 
+	if (data->suspend)
+		data->suspend(data->hdev);
+
 	btusb_stop_traffic(data);
 	usb_kill_anchored_urbs(&data->tx_anchor);
 
@@ -4872,6 +4878,9 @@ static int btusb_resume(struct usb_interface *intf)
 			btusb_submit_isoc_urb(hdev, GFP_NOIO);
 	}
 
+	if (data->resume)
+		data->resume(hdev);
+
 	spin_lock_irq(&data->txlock);
 	play_deferred(data);
 	clear_bit(BTUSB_SUSPENDING, &data->flags);