add usb dfu and tmc class

class/dfu/usbd_dfu.c

@@ -0,0 +1,72 @@
+#include "usbd_core.h"
+#include "usbd_dfu.h"
+
+/* Device data structure */
+struct dfu_cfg_private {
+    struct dfu_info info;
+} usbd_dfu_cfg;
+
+int dfu_class_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
+{
+    USBD_LOG_DBG("DFU Class request: "
+                 "bRequest 0x%02x\r\n",
+                 setup->bRequest);
+
+    switch (setup->bRequest) {
+        case DFU_REQUEST_DETACH:
+
+            break;
+
+        case DFU_REQUEST_DNLOAD:
+
+            break;
+        case DFU_REQUEST_UPLOAD:
+
+            break;
+        case DFU_REQUEST_GETSTATUS:
+
+            break;
+        case DFU_REQUEST_CLRSTATUS:
+
+            break;
+        case DFU_REQUEST_GETSTATE:
+
+            break;
+        case DFU_REQUEST_ABORT:
+
+            break;
+        default:
+            USBD_LOG_ERR("Unhandled request 0x%02x", setup->bRequest);
+            break;
+    }
+
+    return 0;
+}
+
+void dfu_notify_handler(uint8_t event, void *arg)
+{
+    switch (event) {
+        case USB_EVENT_RESET:
+
+            break;
+
+        default:
+            break;
+    }
+}
+
+void usbd_dfu_add_interface(usbd_class_t *class, usbd_interface_t *intf)
+{
+    static usbd_class_t *last_class = NULL;
+
+    if (last_class != class) {
+        last_class = class;
+        usbd_class_register(class);
+    }
+
+    intf->class_handler = dfu_class_request_handler;
+    intf->custom_handler = NULL;
+    intf->vendor_handler = NULL;
+    intf->notify_handler = dfu_notify_handler;
+    usbd_class_add_interface(class, intf);
+}