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在进行驱动移植前，首先得下载linux内核源码

参考前一篇博客：

一.增加PID&VID（对着两个不了解的，建议去找找资料来看看，这个的意思可以简单理解为这个设备的唯一标识）

到自己的linux内核文件下，执行命令

cd  /drivers/usb/serial/                  //到相应文件夹sudo chmod a+w option.c    //该文件是只可读文件，给文件写的权限sudo vim option.c

如果找不到相应的位置，在命令行输入**/关键字/**回车 插入如下代码：

#if 1 //Added by Quectel { USB_DEVICE(0x05C6, 0x9090) }, /* Quectel UC15 */  { USB_DEVICE(0x05C6, 0x9003) }, /* Quectel UC20 */  { USB_DEVICE(0x2C7C, 0x0125) }, /* Quectel EC25 */ { USB_DEVICE(0x2C7C, 0x0121) }, /* Quectel EC21 */  { USB_DEVICE(0x05C6, 0x9215) }, /* Quectel EC20 */  { USB_DEVICE(0x2C7C, 0x0191) }, /* Quectel EG91 */  { USB_DEVICE(0x2C7C, 0x0195) }, /* Quectel EG95 */ { USB_DEVICE(0x2C7C, 0x0306) }, /* Quectel EG06/EP06/EM06 */ { USB_DEVICE(0x2C7C, 0x0296) }, /* Quectel BG96 */ { USB_DEVICE(0x2C7C, 0x0435) }, /* Quectel AG35 */ #endif

对于EC20模组，如果下面的文件和代码下存在 kernel源文件中，需要注释或者删除它们。否则它们将会和EC20 串口驱动冲突。

File: [KERNEL]/drivers/usb/serial/qcserial.c File: [KERNEL]/drivers/net/usb/qmi_wwan.c 注意这里貌似只有EC20的冲突了。

退出保存

二.添加零包处理（这个和usb 协议中的批量传输有关）

执行命令vim usb_wwan.c

usb_fill_bulk_urb(urb, serial->dev,      usb_sndbulkpipe(serial->dev, endpoint) | dir,      buf, len, callback, ctx);    #if 1 //Added by Sky for Zero Packet    if (dir == USB_DIR_OUT)    {        struct usb_device_descriptor *desc = &serial->dev->descriptor;        if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9090))            urb->transfer_flags |= URB_ZERO_PACKET;        if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9003))            urb->transfer_flags |= URB_ZERO_PACKET;        if (desc->idVendor == cpu_to_le16(0x05C6) && desc->idProduct == cpu_to_le16(0x9215))            urb->transfer_flags |= URB_ZERO_PACKET;        if (desc->idVendor == cpu_to_le16(0x2C7C))            urb->transfer_flags |= URB_ZERO_PACKET;    }    #endif ---------------------

退出保存

三.增加休眠后唤醒接口

执行命令 vim option.c 添加代码：

#if 1  //Added by Sky  .reset_resume   = usb_wwan_resume, #endif

四.如果要使用 GobiNet or QMI WWAN，需要阻止第四个接口注册为串口。 执行命令 vim option.c 添加代码：

static int option_probe(struct usb_serial *serial,                const struct usb_device_id *id)    {        struct usb_interface_descriptor *iface_desc =                    &serial->interface->cur_altsetting->desc;        struct usb_device_descriptor *dev_desc = &serial->dev->descriptor;            /* Never bind to the CD-Rom emulation interface */        if (iface_desc->bInterfaceClass == 0x08)            return -ENODEV;            /*         * Don't bind reserved interfaces (like network ones) which often have         * the same class/subclass/protocol as the serial interfaces.  Look at         * the Windows driver .INF files for reserved interface numbers.         */        if (is_blacklisted(            iface_desc->bInterfaceNumber,            OPTION_BLACKLIST_RESERVED_IF,            (const struct option_blacklist_info *) id->driver_info))            return -ENODEV;        /*         * Don't bind network interface on Samsung GT-B3730, it is handled by         * a separate module.         */        if (dev_desc->idVendor == cpu_to_le16(SAMSUNG_VENDOR_ID) &&            dev_desc->idProduct == cpu_to_le16(SAMSUNG_PRODUCT_GT_B3730) &&            iface_desc->bInterfaceClass != USB_CLASS_CDC_DATA)            return -ENODEV;                    #if 1  //Added by Sky             //Quectel UC20's interface 4 can be used as USB Network device              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;         //Quectel EC20's interface 4 can be used as USB Network device          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;             //Quectel EC21&EC25&EC20 R2.0's interface 4 can be used as USB Network device          if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)   \            && serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)               return -ENODEV;         #endif     /* Store device id so we can use it during attach. */    usb_set_serial_data(serial, (void *)id);    return 0;}---------------------

保存退出

五.修改内核配置，并编译内核，刷入新内核

1.切换到内核目录 cd <你的内核目录> 2.编译内核 执行命令 sudo make menuconfig 此时可能报错 错误：

*** Unable to find the ncurses libraries or the*** required header files.*** ‘make menuconfig’ requires the ncurses libraries.****** Install ncurses (ncurses-devel) and try again.

根据错误报告是缺少Ncurses库，需要安装该库（Ncurses 提供字符终端处理库，包括面板和菜单）

详见ncures_百度百科

解决办法如下：

CentOS： yum install -y ncurses-devel

Ubuntu：

sudo apt-get install ncurses-dev

3.添加USB 串口 GSM 和 CDMA 驱动选项

保存配置

4.启用USB网络支持

5.添加驱动代码 [KERNEL]/drivers/net/usb/Makefile"

obj-y += GobiNet.o GobiNet-objs := GobiUSBNet.o QMIDevice.o QMI.o

六.建立下载驱动作为Linux主机的内核

1.切换到内核目录

cd <你的内核目录> 2.构建驱动

sudo make -C /lib/modules/`uname -r`/build M=`pwd`/drivers/usb/serial obj-m=option.o modules sudo make -C /lib/modules/`uname -r`/build M=`pwd`/drivers/usb/serial obj-m=usb_wwan.o modules sudo make -C /lib/modules/`uname -r`/build M=`pwd`/drivers/usb/serial obj-m=qcserial.o modules

3.下载驱动并且重启

sudo cp drivers/usb/serial/option.ko /lib/modules/`uname -r`/kernel/drivers/usb/serial sudo cp drivers/usb/serial/usb_wwan.ko /lib/modules/`uname -r`/kernel/drivers/usb/serial sudo cp drivers/usb/serial/qcserial.ko /lib/modules/`uname -r`/kernel/drivers/usb/serial sudo depmod sudo reboot

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