适配移远RG200U-5G模块_rg200u 5g 显示 usb0 没有 wwan

内核下宏支持：

ppp：
CONFIG_PPP=y
CONFIG_PPP_BSDCOMP=y
CONFIG_PPP_DEFLATE=y
CONFIG_PPP_FILTER=y
CONFIG_PPP_MPPE=y
CONFIG_PPP_MULTILINK=y
CONFIG_PPPOE=y
CONFIG_PPPOLAC=y
CONFIG_PPPOPNS=y
CONFIG_PPP_ASYNC=y
CONFIG_PPP_SYNC_TTY=y
CONFIG_SLIP=y
CONFIG_SLHC=y
rndis：
CONFIG_USB_USBNET=y
CONFIG_USB_NET_CDCETHER=y
CONFIG_USB_NET_RNDIS_HOST=y
options:
CONFIG_USB_SERIAL=y
CONFIG_USB_SERIAL_WWAN=y
CONFIG_USB_SERIAL_OPTION=y
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kernel下涉及文件：

drivers/usb/serial/option.c
drivers/usb/serial/usb_wwan.c
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添加模块的vid和pid，找到drivers/usb/serial/option.c文件中option_ids数组

static const struct usb_device_id option_ids[] = {
 { USB_DEVICE(0x2C7C, 0x0900) },
 .....
 {}
 }
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重新编译内核，烧写到开发板，可以看到模块默认为ncm，但加载的节点只有两个，且发送不了at指令。

将drivers/usb/serial/option.c文件中option_probe函数做如下修改：

#if 0 //Added by Quectel   
        if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9003)
                && serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
                return -ENODEV;
        if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6) && serial->dev->descriptor.idProduct == cpu_to_le16(0x9215)
                && serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
                return -ENODEV;
        if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
                __u16 idProduct = le16_to_cpu(serial->dev->descriptor.idProduct);
                __u8 bInterfaceNumber = serial->interface->cur_altsetting->desc.bInterfaceNumber;
                //Quectel module's some interfaces can be used as USB Network device (ecm, rndis, mbim)
                if (serial->interface->cur_altsetting->desc.bInterfaceClass != 0xFF)
                        return -ENODEV;
                if ((idProduct&0xF000) == 0x6000) {
                        //ASR interface 4 is modem port
                }
                else if ((idProduct&0xF000) == 0x8000) {
                        //HISI interface 0 is NCM
                        if (bInterfaceNumber == 0)
                                return -ENODEV;
                }
                else if ((idProduct&0xF000) == 0x0000) {
                        //MDM interface 4 is QMI
                        if (bInterfaceNumber >= 4) {
                                return -ENODEV;
                        }
                }
        }
#endif

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添加零包机制，在drivers/usb/serial/usb_wwan.c，做如下修改：

找到usb_wwan_setup_urb函数：
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -504,7 +504,13 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
        usb_fill_bulk_urb(urb, serial->dev,
                          usb_sndbulkpipe(serial->dev, endpoint) | dir,
                          buf, len, callback, ctx);
-
+       #if 1
+               if (dir == USB_DIR_OUT) {
+                       struct usb_device_descriptor *desc = &serial->dev->descriptor;
+                       if (desc->idVendor == cpu_to_le16(0x2C7C))
+                               urb->transfer_flags |= URB_ZERO_PACKET;
+               }
+       #endif
        return urb;
 }

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做完以上步骤重新编译，烧写到开发板，将会看到完整加载后的ttyUSB节点和usb0网卡节点

一切准备就绪可以通过以下命令来进行测试网络。

直接进行拨号：dhclient -v usb0  或者  udhcpc -i usb0
如果有问题的话可通过at指令来配置。
(1)at指令配置:
at+qcfg="ethernet",0   //配置成USB模式
at+qcfg="nat",0       //配置成网卡模式
at+qcfg="usbnet",5    //配置NCM拨号方式
at+qcfg="usbnet",1    //ecm
AT+QCFG="usbnet",3    //rndis
重启生效，发送at指令at+cfun=1,1
(2) at+qeng=”servingcell”确认是否注网，注网后，at+qnetdevctl=1,1,1执行拨号
(3) ifconfig –a查看网卡，route –n查看路由表，然后用ping命令测试网络

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