docs: add vendor rst

docs/source/demo/usbd_vendor.rst

@@ -0,0 +1,44 @@
+vendor device 驱动编写
+===========================
+
+本节主要介绍如何编写一个 vendor device 驱动。
+
+- 首先复制一份 class/template/usbd_xxx.c 文件
+- 实现以下三个回调函数，通常来说，vendor 驱动只需要实现 vendor_handler
+
+.. code-block:: C
+
+    intf->class_interface_handler = xxx_class_interface_request_handler;
+    intf->class_endpoint_handler = NULL;
+    intf->vendor_handler = NULL;
+    intf->notify_handler = xxx_notify_handler;
+
+- 举例如下
+
+case1 演示对于主机 IN 数据的处理，将数据拷贝到 *data 中，并指定*len 的长度。协议栈会自动发送给主机，不需要用户手动调用发送 API。
+
+case2 演示对于主机 OUT 数据的处理，当执行到此函数时，说明数据都已经接收完成，可以直接读取 *data 中的数据，长度为 *len。
+
+.. code-block:: C
+
+    static int xxx_vendor_request_handler(uint8_t busid, struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
+    {
+        USB_LOG_WRN("XXX Class request: "
+                    "bRequest 0x%02x\r\n",
+                    setup->bRequest);
+
+        switch (setup->bRequest) {
+            case 1:
+            memcpy(*data, xxx, sizeof(xxx));
+            *len = sizeof(xxx);
+            case 2:
+            hexdump(*data, *len);
+            default:
+                USB_LOG_WRN("Unhandled XXX Class bRequest 0x%02x\r\n", setup->bRequest);
+                return -1;
+        }
+
+        return 0;
+    }
+
+- 最后使用形如 usbd_add_interface(busid, usbd_xxx_init_intf(&intf)) 注册接口

docs/source/demo/usbh_vendor.rst

@@ -0,0 +1,127 @@
+vendor host 驱动编写
+===========================
+
+本节主要介绍如何编写一个 vendor host 驱动。
+
+- 首先复制一份 class/template/usbh_xxx.c 文件
+
+- 定义 class 驱动并使用 CLASS_INFO_DEFINE 前缀，这样，枚举完成后，协议栈自动通过 usbd_class_find_driver 来查找对应的驱动。
+
+.. code-block:: C
+
+    static const struct usbh_class_driver xxx_class_driver = {
+        .driver_name = "xxx",
+        .connect = usbh_xxx_connect,
+        .disconnect = usbh_xxx_disconnect
+    };
+
+    CLASS_INFO_DEFINE const struct usbh_class_info xxx_class_info = {
+        .match_flags = USB_CLASS_MATCH_INTF_CLASS | USB_CLASS_MATCH_INTF_SUBCLASS | USB_CLASS_MATCH_INTF_PROTOCOL,
+        .bInterfaceClass = 0,
+        .bInterfaceSubClass = 0,
+        .bInterfaceProtocol = 0,
+        .id_table = NULL,
+        .class_driver = &xxx_class_driver
+    };
+
+
+- 实现 connect 和 disconnect 函数, 在 connect 函数中，需要分配一个 xxx_class 结构体，在 disconnect 函数中释放 urb 和 xxx_class。
+
+.. code-block:: C
+
+    struct usbh_xxx {
+        struct usbh_hubport *hport;
+        struct usb_endpoint_descriptor *xxxin;
+        struct usb_endpoint_descriptor *xxxout;
+        struct usbh_urb xxxin_urb;
+        struct usbh_urb xxxout_urb;
+
+        uint8_t intf; /* interface number */
+        uint8_t minor;
+
+        void *user_data;
+    };
+
+    static int usbh_xxx_connect(struct usbh_hubport *hport, uint8_t intf)
+    {
+        struct usb_endpoint_descriptor *ep_desc;
+        int ret;
+
+        struct usbh_xxx *xxx_class = usbh_xxx_class_alloc();
+        if (xxx_class == NULL) {
+            USB_LOG_ERR("Fail to alloc xxx_class\r\n");
+            return -USB_ERR_NOMEM;
+        }
+
+        return ret;
+    }
+
+
+    static int usbh_xxx_disconnect(struct usbh_hubport *hport, uint8_t intf)
+    {
+        int ret = 0;
+
+        struct usbh_xxx *xxx_class = (struct usbh_xxx *)hport->config.intf[intf].priv;
+
+        if (xxx_class) {
+            if (xxx_class->xxxin) {
+                usbh_kill_urb(&xxx_class->xxxin_urb);
+            }
+
+            if (xxx_class->xxxout) {
+                usbh_kill_urb(&xxx_class->xxxout_urb);
+            }
+
+            if (hport->config.intf[intf].devname[0] != '\0') {
+                USB_LOG_INFO("Unregister xxx Class:%s\r\n", hport->config.intf[intf].devname);
+                usbh_xxx_stop(xxx_class);
+            }
+
+            usbh_xxx_class_free(xxx_class);
+        }
+
+        return ret;
+    }
+
+- 初始化端点
+
+.. code-block:: C
+
+        for (uint8_t i = 0; i < hport->config.intf[intf].altsetting[0].intf_desc.bNumEndpoints; i++) {
+        ep_desc = &hport->config.intf[intf].altsetting[0].ep[i].ep_desc;
+        if (ep_desc->bEndpointAddress & 0x80) {
+            USBH_EP_INIT(xxx_class->intin, ep_desc);
+        } else {
+            USBH_EP_INIT(xxx_class->intout, ep_desc);
+        }
+    }
+
+- 最后设计收发 API，根据实际情况设计成同步 or 异步。
+
+.. code-block:: C
+
+    int usbh_xxx_in_transfer(struct usbh_xxx *xxx_class, uint8_t *buffer, uint32_t buflen, uint32_t timeout)
+    {
+        int ret;
+        struct usbh_urb *urb = &xxx_class->xxxin_urb;
+
+        usbh_xxx_urb_fill(urb, xxx_class->hport, xxx_class->xxxin, buffer, buflen, timeout, NULL, NULL);
+        ret = usbh_submit_urb(urb);
+        if (ret == 0) {
+            ret = urb->actual_length;
+        }
+        return ret;
+    }
+
+    int usbh_xxx_out_transfer(struct usbh_xxx *xxx_class, uint8_t *buffer, uint32_t buflen, uint32_t timeout)
+    {
+        int ret;
+        struct usbh_urb *urb = &xxx_class->xxxout_urb;
+
+        usbh_xxx_urb_fill(urb, xxx_class->hport, xxx_class->xxxout, buffer, buflen, timeout, NULL, NULL);
+        ret = usbh_submit_urb(urb);
+        if (ret == 0) {
+            ret = urb->actual_length;
+        }
+        return ret;
+    }

docs/source/index.rst

@@ -112,6 +112,8 @@ CherryUSB 是一个小而美的、可移植性高的、用于嵌入式系统的
    demo/usbh_net
    demo/usbh_bluetooth
    demo/usbh_wifi
+   demo/usbd_vendor
+   demo/usbh_vendor
 
 .. toctree::
    :maxdepth: 1