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diff --git a/src/VBox/Main/include/USBGetDevices.h b/src/VBox/Main/include/USBGetDevices.h
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+++ b/src/VBox/Main/include/USBGetDevices.h
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+/* $Id: USBGetDevices.h $ */
+/** @file
+ * VirtualBox Linux host USB device enumeration.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * 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, in version 3 of the
+ * License.
+ *
+ * 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, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef MAIN_INCLUDED_USBGetDevices_h
+#define MAIN_INCLUDED_USBGetDevices_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/usb.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+
+/**
+ * Free all the members of a USB device created by the Linux enumeration code.
+ *
+ * @note This duplicates a USBProxyService method which we needed access too
+ *       without pulling in the rest of the proxy service code.
+ *
+ * @param   pDevice     Pointer to the device.
+ */
+DECLINLINE(void) deviceFreeMembers(PUSBDEVICE pDevice)
+{
+    RTStrFree((char *)pDevice->pszManufacturer);
+    pDevice->pszManufacturer = NULL;
+    RTStrFree((char *)pDevice->pszProduct);
+    pDevice->pszProduct = NULL;
+    RTStrFree((char *)pDevice->pszSerialNumber);
+    pDevice->pszSerialNumber = NULL;
+
+    RTStrFree((char *)pDevice->pszAddress);
+    pDevice->pszAddress = NULL;
+}
+
+/**
+ * Free one USB device created by the Linux enumeration code.
+ *
+ * @note This duplicates a USBProxyService method which we needed access too
+ *       without pulling in the rest of the proxy service code.
+ *
+ * @param   pDevice     Pointer to the device. NULL is OK.
+ */
+DECLINLINE(void) deviceFree(PUSBDEVICE pDevice)
+{
+    if (pDevice)
+    {
+        deviceFreeMembers(pDevice);
+        RTMemFree(pDevice);
+    }
+}
+
+/**
+ * Free a linked list of USB devices created by the Linux enumeration code.
+ * @param  ppHead  Pointer to the first device in the linked list
+ */
+DECLINLINE(void) deviceListFree(PUSBDEVICE *ppHead)
+{
+    PUSBDEVICE pHead = *ppHead;
+    while (pHead)
+    {
+        PUSBDEVICE pNext = pHead->pNext;
+        deviceFree(pHead);
+        pHead = pNext;
+    }
+    *ppHead = NULL;
+}
+
+RT_C_DECLS_BEGIN
+
+extern bool USBProxyLinuxCheckDeviceRoot(const char *pcszRoot, bool fIsDeviceNodes);
+
+#ifdef UNIT_TEST
+void TestUSBSetupInit(const char *pcszUsbfsRoot, bool fUsbfsAccessible,
+                      const char *pcszDevicesRoot, bool fDevicesAccessible,
+                      int rcMethodInitResult);
+void TestUSBSetEnv(const char *pcszEnvUsb, const char *pcszEnvUsbRoot);
+#endif
+
+extern int USBProxyLinuxChooseMethod(bool *pfUsingUsbfsDevices, const char **ppcszDevicesRoot);
+#ifdef UNIT_TEST
+extern void TestUSBSetAvailableUsbfsDevices(const char **pacszDeviceAddresses);
+extern void TestUSBSetAccessibleFiles(const char **pacszAccessibleFiles);
+#endif
+
+extern PUSBDEVICE USBProxyLinuxGetDevices(const char *pcszDevicesRoot, bool fUseSysfs);
+
+RT_C_DECLS_END
+
+#endif /* !MAIN_INCLUDED_USBGetDevices_h */
+