diff --git a/src/simtrace2/libusb_util.h b/src/simtrace2/libusb_util.h
new file mode 100644
index 0000000..2b2d92e
--- /dev/null
+++ b/src/simtrace2/libusb_util.h
@@ -0,0 +1,70 @@
+/* libisb utilities
+ * 
+ * (C) 2010-2016 by Harald Welte <hwelte@hmw-consulting.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+#pragma once
+
+#include <libusb.h>
+
+#define USB_MAX_PATH_LEN 20
+
+struct dev_id {
+	uint16_t vendor_id;
+	uint16_t product_id;
+};
+
+/* Find any USB devices in the system matching the given Vendor and
+ * Product ID */
+libusb_device **find_matching_usb_devs(const struct dev_id *dev_ids);
+
+/* structure describing a single matching interface found */
+struct usb_interface_match {
+	/* libusb device E*/
+	libusb_device *usb_dev;
+	/* Vendor ID of the device running matching interface */
+	uint16_t vendor;
+	/* Product ID of the device running matching interface */
+	uint16_t product;
+	/* USB Bus Address */
+	uint8_t addr;
+	/* physical path */
+	char path[USB_MAX_PATH_LEN];
+	/* configuration of matching interface */
+	uint8_t configuration;
+	/* interface number of matching interface */
+	uint8_t interface;
+	/* altsetting of matching interface */
+	uint8_t altsetting;
+	/* bInterfaceClass of matching interface */
+	uint8_t class;
+	/* bInterfaceSubClass of matching interface */
+	uint8_t sub_class;
+	/* bInterfaceProtocol of matching interface */
+	uint8_t protocol;
+	/* index of string descriptor of matching interface */
+	uint8_t string_idx;
+};
+
+int dev_find_matching_interfaces(libusb_device *dev, int class, int sub_class, int protocol,
+				 struct usb_interface_match *out, unsigned int out_len);
+
+int usb_match_interfaces(libusb_context *ctx, const struct dev_id *dev_ids,
+			 int class, int sub_class, int protocol,
+			 struct usb_interface_match *out, unsigned int out_len);
+
+libusb_device_handle *usb_open_claim_interface(libusb_context *ctx,
+					       const struct usb_interface_match *ifm);