Index: uspace/lib/usb/Makefile
===================================================================
--- uspace/lib/usb/Makefile	(revision dad6e8a74bbeccd0dabf53711be221f488b1c176)
+++ uspace/lib/usb/Makefile	(revision 14388b462f38e091bedab5aee1fbfd96af8f3a3d)
@@ -34,4 +34,5 @@
 SOURCES = \
 	src/addrkeep.c \
+	src/class.c \
 	src/debug.c \
 	src/drvpsync.c \
Index: uspace/lib/usb/include/usb/classes/classes.h
===================================================================
--- uspace/lib/usb/include/usb/classes/classes.h	(revision dad6e8a74bbeccd0dabf53711be221f488b1c176)
+++ uspace/lib/usb/include/usb/classes/classes.h	(revision 14388b462f38e091bedab5aee1fbfd96af8f3a3d)
@@ -60,4 +60,5 @@
 } usb_class_t;
 
+const char *usb_str_class(usb_class_t);
 
 #endif
Index: uspace/lib/usb/src/class.c
===================================================================
--- uspace/lib/usb/src/class.c	(revision 14388b462f38e091bedab5aee1fbfd96af8f3a3d)
+++ uspace/lib/usb/src/class.c	(revision 14388b462f38e091bedab5aee1fbfd96af8f3a3d)
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2010 Vojtech Horky
+ * 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 usb
+ * @{
+ */
+/** @file
+ * @brief Class related functions.
+ */
+#include <usb/classes/classes.h>
+#include <errno.h>
+
+/** Tell string representation of USB class.
+ *
+ * @param cls Class code.
+ * @return String representation.
+ */
+const char *usb_str_class(usb_class_t cls)
+{
+	switch (cls) {
+		case USB_CLASS_USE_INTERFACE:
+			return "use-interface";
+		case USB_CLASS_AUDIO:
+			return "audio";
+		case USB_CLASS_COMMUNICATIONS_CDC_CONTROL:
+			return "communications";
+		case USB_CLASS_HID:
+			return "HID";
+		case USB_CLASS_PHYSICAL:
+			return "physical";
+		case USB_CLASS_IMAGE:
+			return "image";
+		case USB_CLASS_PRINTER:
+			return "printer";
+		case USB_CLASS_MASS_STORAGE:
+			return "mass-storage";
+		case USB_CLASS_HUB:
+			return "hub";
+		case USB_CLASS_CDC_DATA:
+			return "CDC";
+		case USB_CLASS_SMART_CARD:
+			return "smart-card";
+		case USB_CLASS_CONTENT_SECURITY:
+			return "security";
+		case USB_CLASS_VIDEO:
+			return "video";
+		case USB_CLASS_PERSONAL_HEALTHCARE:
+			return "healthcare";
+		case USB_CLASS_DIAGNOSTIC:
+			return "diagnostic";
+		case USB_CLASS_WIRELESS_CONTROLLER:
+			return "wireless";
+		case USB_CLASS_MISCELLANEOUS:
+			return "misc";
+		case USB_CLASS_APPLICATION_SPECIFIC:
+			return "application";
+		case USB_CLASS_VENDOR_SPECIFIC:
+			return "vendor";
+		default:
+			return "unknown";
+	}
+}
+
+
+/**
+ * @}
+ */