Index: uspace/lib/usb/include/usb/devdrv.h
===================================================================
--- uspace/lib/usb/include/usb/devdrv.h	(revision f35b2942f93a409eb40a17d0d303cf1aec814999)
+++ uspace/lib/usb/include/usb/devdrv.h	(revision 501e5df2482df5d8fad5599fc5f684cdc627c72e)
@@ -169,4 +169,12 @@
     usb_polling_callback_t, size_t, usb_polling_terminted_callback_t, void *);
 
+int usb_device_retrieve_descriptors(usb_pipe_t *, usb_device_descriptors_t *);
+int usb_device_create_pipes(ddf_dev_t *, usb_device_connection_t *,
+    usb_endpoint_description_t **, uint8_t *, size_t, int, int,
+    usb_endpoint_mapping_t **, size_t *);
+int usb_device_destroy_pipes(ddf_dev_t *, usb_endpoint_mapping_t *, size_t);
+
+size_t usb_interface_count_alternates(uint8_t *, size_t, uint8_t);
+
 #endif
 /**
Index: uspace/lib/usb/include/usb/host/device_keeper.h
===================================================================
--- uspace/lib/usb/include/usb/host/device_keeper.h	(revision f35b2942f93a409eb40a17d0d303cf1aec814999)
+++ uspace/lib/usb/include/usb/host/device_keeper.h	(revision 501e5df2482df5d8fad5599fc5f684cdc627c72e)
@@ -73,4 +73,6 @@
 void usb_device_keeper_add_ep(
     usb_device_keeper_t *instance, usb_address_t address, endpoint_t *ep);
+void usb_device_keeper_del_ep(
+    usb_device_keeper_t *instance, usb_address_t address, endpoint_t *ep);
 
 void usb_device_keeper_reserve_default_address(
Index: uspace/lib/usb/include/usb/pipes.h
===================================================================
--- uspace/lib/usb/include/usb/pipes.h	(revision f35b2942f93a409eb40a17d0d303cf1aec814999)
+++ uspace/lib/usb/include/usb/pipes.h	(revision 501e5df2482df5d8fad5599fc5f684cdc627c72e)
@@ -42,4 +42,5 @@
 #include <ipc/devman.h>
 #include <ddf/driver.h>
+#include <fibril_synch.h>
 
 /** Abstraction of a physical connection to the device.
@@ -59,6 +60,14 @@
  * This endpoint must be bound with existing usb_device_connection_t
  * (i.e. the wire to send data over).
+ *
+ * Locking order: if you want to lock both mutexes
+ * (@c guard and @c hc_phone_mutex), lock @c guard first.
+ * It is not necessary to lock @c guard if you want to lock @c hc_phone_mutex
+ * only.
  */
 typedef struct {
+	/** Guard of the whole pipe. */
+	fibril_mutex_t guard;
+
 	/** The connection used for sending the data. */
 	usb_device_connection_t *wire;
@@ -78,6 +87,16 @@
 	/** Phone to the host controller.
 	 * Negative when no session is active.
+	 * It is an error to access this member without @c hc_phone_mutex
+	 * being locked.
+	 * If call over the phone is to be made, it must be preceeded by
+	 * call to pipe_add_ref() [internal libusb function].
 	 */
 	int hc_phone;
+
+	/** Guard for serialization of requests over the phone. */
+	fibril_mutex_t hc_phone_mutex;
+
+	/** Number of active transfers over the pipe. */
+	int refcount;
 } usb_pipe_t;
 
@@ -134,4 +153,6 @@
 int usb_pipe_initialize_from_configuration(usb_endpoint_mapping_t *,
     size_t, uint8_t *, size_t, usb_device_connection_t *);
+int usb_pipe_register_with_speed(usb_pipe_t *, usb_speed_t,
+    unsigned int, usb_hc_connection_t *);
 int usb_pipe_register(usb_pipe_t *, unsigned int, usb_hc_connection_t *);
 int usb_pipe_unregister(usb_pipe_t *, usb_hc_connection_t *);
@@ -140,4 +161,7 @@
 int usb_pipe_end_session(usb_pipe_t *);
 bool usb_pipe_is_session_started(usb_pipe_t *);
+
+int usb_pipe_start_long_transfer(usb_pipe_t *);
+void usb_pipe_end_long_transfer(usb_pipe_t *);
 
 int usb_pipe_read(usb_pipe_t *, void *, size_t, size_t *);
Index: uspace/lib/usb/include/usb/usb.h
===================================================================
--- uspace/lib/usb/include/usb/usb.h	(revision f35b2942f93a409eb40a17d0d303cf1aec814999)
+++ uspace/lib/usb/include/usb/usb.h	(revision 501e5df2482df5d8fad5599fc5f684cdc627c72e)
@@ -77,5 +77,7 @@
 	USB_SPEED_FULL,
 	/** USB 2.0 high speed (480Mbits/s). */
-	USB_SPEED_HIGH
+	USB_SPEED_HIGH,
+	/** Psuedo-speed serving as a boundary. */
+	USB_SPEED_MAX
 } usb_speed_t;