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diff --git a/tinyusb/src/host/usbh_classdriver.h b/tinyusb/src/host/usbh_classdriver.h
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+++ b/tinyusb/src/host/usbh_classdriver.h
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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef _TUSB_USBH_CLASSDRIVER_H_
+#define _TUSB_USBH_CLASSDRIVER_H_
+
+#include "osal/osal.h"
+#include "common/tusb_fifo.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Class Driver API
+//--------------------------------------------------------------------+
+
+typedef struct {
+  #if CFG_TUSB_DEBUG >= 2
+  char const* name;
+  #endif
+
+  void (* const init       )(void);
+  bool (* const open       )(uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
+  bool (* const set_config )(uint8_t dev_addr, uint8_t itf_num);
+  bool (* const xfer_cb    )(uint8_t dev_addr, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes);
+  void (* const close      )(uint8_t dev_addr);
+} usbh_class_driver_t;
+
+// Call by class driver to tell USBH that it has complete the enumeration
+void usbh_driver_set_config_complete(uint8_t dev_addr, uint8_t itf_num);
+
+uint8_t usbh_get_rhport(uint8_t dev_addr);
+
+uint8_t* usbh_get_enum_buf(void);
+
+//--------------------------------------------------------------------+
+// USBH Endpoint API
+//--------------------------------------------------------------------+
+
+// Open an endpoint
+bool usbh_edpt_open(uint8_t rhport, uint8_t dev_addr, tusb_desc_endpoint_t const * desc_ep);
+
+// Submit a usb transfer
+bool usbh_edpt_xfer(uint8_t dev_addr, uint8_t ep_addr, uint8_t * buffer, uint16_t total_bytes);
+
+// Claim an endpoint before submitting a transfer.
+// If caller does not make any transfer, it must release endpoint for others.
+bool usbh_edpt_claim(uint8_t dev_addr, uint8_t ep_addr);
+
+bool usbh_edpt_release(uint8_t dev_addr, uint8_t ep_addr);
+
+// Check if endpoint transferring is complete
+bool usbh_edpt_busy(uint8_t dev_addr, uint8_t ep_addr);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif