Index: uspace/lib/usbhost/src/usb_device_manager.c
===================================================================
--- uspace/lib/usbhost/src/usb_device_manager.c	(revision 432a269a199e1222ec7393827fd1a4a21322db9c)
+++ uspace/lib/usbhost/src/usb_device_manager.c	(revision 432a269a199e1222ec7393827fd1a4a21322db9c)
@@ -0,0 +1,208 @@
+/*
+ * 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 libusbhost
+ * @{
+ */
+/** @file
+ * Device manager structure and functions (implementation).
+ */
+#include <assert.h>
+#include <errno.h>
+#include <usb/debug.h>
+#include <usb/host/usb_device_manager.h>
+
+/*----------------------------------------------------------------------------*/
+/** Initialize device manager structure.
+ *
+ * @param[in] instance Memory place to initialize.
+ *
+ * Set all values to false/0.
+ */
+void usb_device_manager_init(usb_device_manager_t *instance)
+{
+	assert(instance);
+	unsigned i = 0;
+	for (; i < USB_ADDRESS_COUNT; ++i) {
+		instance->devices[i].occupied = false;
+		instance->devices[i].handle = 0;
+		instance->devices[i].speed = USB_SPEED_MAX;
+	}
+	// TODO: is this hack enough?
+	// (it is needed to allow smooth registration at default address)
+	instance->devices[0].occupied = true;
+	instance->last_address = 0;
+	fibril_mutex_initialize(&instance->guard);
+}
+/*----------------------------------------------------------------------------*/
+/** Get a free USB address
+ *
+ * @param[in] instance Device manager structure to use.
+ * @param[in] speed Speed of the device requiring address.
+ * @return Free address, or error code.
+ */
+usb_address_t usb_device_manager_get_free_address(
+    usb_device_manager_t *instance, usb_speed_t speed)
+{
+	assert(instance);
+	fibril_mutex_lock(&instance->guard);
+
+	usb_address_t new_address = instance->last_address;
+	do {
+		++new_address;
+		if (new_address > USB11_ADDRESS_MAX)
+			new_address = 1;
+		if (new_address == instance->last_address) {
+			fibril_mutex_unlock(&instance->guard);
+			return ENOSPC;
+		}
+	} while (instance->devices[new_address].occupied);
+
+	assert(new_address != USB_ADDRESS_DEFAULT);
+	assert(instance->devices[new_address].occupied == false);
+
+	instance->devices[new_address].occupied = true;
+	instance->devices[new_address].speed = speed;
+	instance->last_address = new_address;
+
+	fibril_mutex_unlock(&instance->guard);
+	return new_address;
+}
+/*----------------------------------------------------------------------------*/
+/** Bind USB address to devman handle.
+ *
+ * @param[in] instance Device manager structure to use.
+ * @param[in] address Device address
+ * @param[in] handle Devman handle of the device.
+ */
+void usb_device_manager_bind(usb_device_manager_t *instance,
+    usb_address_t address, devman_handle_t handle)
+{
+	assert(instance);
+	fibril_mutex_lock(&instance->guard);
+
+	assert(address > 0);
+	assert(address <= USB11_ADDRESS_MAX);
+	assert(instance->devices[address].occupied);
+
+	instance->devices[address].handle = handle;
+	fibril_mutex_unlock(&instance->guard);
+}
+/*----------------------------------------------------------------------------*/
+/** Release used USB address.
+ *
+ * @param[in] instance Device manager structure to use.
+ * @param[in] address Device address
+ */
+void usb_device_manager_release(
+    usb_device_manager_t *instance, usb_address_t address)
+{
+	assert(instance);
+	assert(address > 0);
+	assert(address <= USB11_ADDRESS_MAX);
+
+	fibril_mutex_lock(&instance->guard);
+	assert(instance->devices[address].occupied);
+
+	instance->devices[address].occupied = false;
+	fibril_mutex_unlock(&instance->guard);
+}
+/*----------------------------------------------------------------------------*/
+/** Find USB address associated with the device
+ *
+ * @param[in] instance Device manager structure to use.
+ * @param[in] handle Devman handle of the device seeking its address.
+ * @return USB Address, or error code.
+ */
+usb_address_t usb_device_manager_find(
+    usb_device_manager_t *instance, devman_handle_t handle)
+{
+	assert(instance);
+	fibril_mutex_lock(&instance->guard);
+	usb_address_t address = 1;
+	while (address <= USB11_ADDRESS_MAX) {
+		if (instance->devices[address].handle == handle) {
+			assert(instance->devices[address].occupied);
+			fibril_mutex_unlock(&instance->guard);
+			return address;
+		}
+		++address;
+	}
+	fibril_mutex_unlock(&instance->guard);
+	return ENOENT;
+}
+
+/** Find devman handle assigned to USB address.
+ * Intentionally refuse to find handle of default address.
+ *
+ * @param[in] instance Device manager structure to use.
+ * @param[in] address Address the caller wants to find.
+ * @param[out] handle Where to store found handle.
+ * @return Whether such address is currently occupied.
+ */
+bool usb_device_manager_find_by_address(usb_device_manager_t *instance,
+    usb_address_t address, devman_handle_t *handle)
+{
+	assert(instance);
+	fibril_mutex_lock(&instance->guard);
+	if ((address <= 0) || (address >= USB_ADDRESS_COUNT)) {
+		fibril_mutex_unlock(&instance->guard);
+		return false;
+	}
+	if (!instance->devices[address].occupied) {
+		fibril_mutex_unlock(&instance->guard);
+		return false;
+	}
+
+	if (handle != NULL) {
+		*handle = instance->devices[address].handle;
+	}
+
+	fibril_mutex_unlock(&instance->guard);
+	return true;
+}
+
+/*----------------------------------------------------------------------------*/
+/** Get speed associated with the address
+ *
+ * @param[in] instance Device manager structure to use.
+ * @param[in] address Address of the device.
+ * @return USB speed.
+ */
+usb_speed_t usb_device_manager_get_speed(
+    usb_device_manager_t *instance, usb_address_t address)
+{
+	assert(instance);
+	assert(address >= 0);
+	assert(address <= USB11_ADDRESS_MAX);
+
+	return instance->devices[address].speed;
+}
+/**
+ * @}
+ */
