Index: uspace/lib/usb/include/usb/host/device_keeper.h
===================================================================
--- uspace/lib/usb/include/usb/host/device_keeper.h	(revision 1fb1339c2806d3d992b780c1f6c3a411fc3fdfe6)
+++ uspace/lib/usb/include/usb/host/device_keeper.h	(revision 1fb1339c2806d3d992b780c1f6c3a411fc3fdfe6)
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2011 Jan Vesely
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libusb
+ * @{
+ */
+/** @file
+ * @brief UHCI driver
+ */
+#ifndef UTILS_DEVICE_KEEPER_H
+#define UTILS_DEVICE_KEEPER_H
+#include <devman.h>
+#include <fibril_synch.h>
+#include <usb/usb.h>
+
+#define USB_ADDRESS_COUNT (USB11_ADDRESS_MAX + 1)
+
+struct usb_device_info {
+	usb_speed_t speed;
+	bool occupied;
+	uint16_t toggle_status;
+	devman_handle_t handle;
+};
+
+typedef struct device_keeper {
+	struct usb_device_info devices[USB_ADDRESS_COUNT];
+	fibril_mutex_t guard;
+	fibril_condvar_t default_address_occupied;
+	usb_address_t last_address;
+} device_keeper_t;
+
+void device_keeper_init(device_keeper_t *instance);
+
+void device_keeper_reserve_default(
+    device_keeper_t *instance, usb_speed_t speed);
+
+void device_keeper_release_default(device_keeper_t *instance);
+
+void device_keeper_reset_if_need(
+    device_keeper_t *instance, usb_target_t target, const unsigned char *setup_data);
+
+int device_keeper_get_toggle(device_keeper_t *instance, usb_target_t target);
+
+int device_keeper_set_toggle(
+    device_keeper_t *instance, usb_target_t target, bool toggle);
+
+usb_address_t device_keeper_request(
+    device_keeper_t *instance, usb_speed_t speed);
+
+void device_keeper_bind(
+    device_keeper_t *instance, usb_address_t address, devman_handle_t handle);
+
+void device_keeper_release(device_keeper_t *instance, usb_address_t address);
+
+usb_address_t device_keeper_find(
+    device_keeper_t *instance, devman_handle_t handle);
+
+usb_speed_t device_keeper_speed(
+    device_keeper_t *instance, usb_address_t address);
+#endif
+/**
+ * @}
+ */