diff --git a/src/include/86box/usb.h b/src/include/86box/usb.h
index 10b27fd30..ecb5c0f86 100644
--- a/src/include/86box/usb.h
+++ b/src/include/86box/usb.h
@@ -86,12 +86,22 @@ typedef struct
     void* priv;
 } usb_device_t;
 
+enum usb_bus_types
+{
+    USB_BUS_OHCI = 0,
+    USB_BUS_UHCI = 1
+};
+
 /* Global variables. */
 extern const device_t usb_device;
 
 /* Functions. */
 extern void uhci_update_io_mapping(usb_t *dev, uint8_t base_l, uint8_t base_h, int enable);
 extern void ohci_update_mem_mapping(usb_t *dev, uint8_t base1, uint8_t base2, uint8_t base3, int enable);
+/* Attach USB device to a port of a USB bus. Returns the port to which it got attached to. */
+extern uint8_t usb_attach_device(usb_t *dev, usb_device_t* device, uint8_t bus_type);
+/* Detach USB device from a port. */
+extern void usb_detach_device(usb_t *dev, uint8_t port, uint8_t bus_type);
 
 #ifdef __cplusplus
 }
diff --git a/src/usb.c b/src/usb.c
index 19c17f865..d0703b5d7 100644
--- a/src/usb.c
+++ b/src/usb.c
@@ -464,6 +464,18 @@ ohci_update_mem_mapping(usb_t *dev, uint8_t base1, uint8_t base2, uint8_t base3,
         mem_mapping_set_addr(&dev->ohci_mmio_mapping, dev->ohci_mem_base, 0x1000);
 }
 
+uint8_t
+usb_attach_device(usb_t *dev, usb_device_t* device, uint8_t bus_type)
+{
+    return 255;
+}
+
+void
+usb_detach_device(usb_t *dev, uint8_t port, uint8_t bus_type)
+{
+    /* Unused. */
+}
+
 static void
 usb_reset(void *priv)
 {