add usb host stack(class not release completely)

class/hub/usbh_hub.h

@@ -0,0 +1,42 @@
+/**
+ * @file usbh_hub.h
+ *
+ * Copyright (c) 2022 sakumisu
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#ifndef _USBH_HUB_H_
+#define _USBH_HUB_H_
+
+#include "usb_hub.h"
+
+#define USBH_HUB_MAX_PORTS 4
+/* Maximum size of an interrupt IN transfer */
+#define USBH_HUB_INTIN_BUFSIZE ((USBH_HUB_MAX_PORTS + 8) >> 3)
+
+extern const struct usbh_class_driver hub_class_driver;
+extern usb_slist_t hub_class_head;
+extern usb_osal_thread_t hub_thread;
+#ifdef __cplusplus
+extern "C" {
+#endif
+int usbh_hub_initialize(void);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _USBH_HUB_H_ */