Index: uspace/lib/usb/include/usb/host/device_keeper.h
===================================================================
--- uspace/lib/usb/include/usb/host/device_keeper.h	(revision 841e6e5b8b02d95d5bcb393f7dde3e59d9c79846)
+++ uspace/lib/usb/include/usb/host/device_keeper.h	(revision d012590127319c20b3a2899b69cfc78f045da760)
@@ -51,4 +51,5 @@
 	usb_speed_t speed;
 	bool occupied;
+	bool control_used;
 	uint16_t toggle_status[2];
 	devman_handle_t handle;
@@ -61,5 +62,5 @@
 	struct usb_device_info devices[USB_ADDRESS_COUNT];
 	fibril_mutex_t guard;
-	fibril_condvar_t default_address_occupied;
+	fibril_condvar_t change;
 	usb_address_t last_address;
 } usb_device_keeper_t;
@@ -97,4 +98,10 @@
     usb_address_t address);
 
+void usb_device_keeper_use_control(usb_device_keeper_t *instance,
+    usb_address_t address);
+
+void usb_device_keeper_release_control(usb_device_keeper_t *instance,
+    usb_address_t address);
+
 #endif
 /**