前言

本文章介紹了在linux系統下，如何修改usb驅動支持移遠模塊，移遠模塊正常啟動后，通過USB連接到linux設備上，驅動正常加載后會在/dev/下產ttyUSB*設備。

一、USB串口驅動

1.1 添加VID和PID? ?

linux下通過lsusb就可以查看USB的VID和PID

#lsusb

Bus 001 Device 011: ID 2C7C:0125

說明這個USB設備的VID為2C7C，PID為0125；

File: [KERNEL]/drivers/usb/serial/option.c

static const struct usb_device_id option_ids[] = { //Added by Quectel { USB_DEVICE(0x2C7C, 0x0125) }, //End by Quectel { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) }, { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) }, { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_LIGHT) }, { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD) }, { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD_LIGHT) },

1.2 屏蔽沖突

File: [KERNEL]/drivers/usb/serial/qcserial.c

{USB_DEVICE(0x2C7C, 0x0125)}, /* Acer Gobi 2000 Modem device (VP413) */

File: [KERNEL]/drivers/net/usb/qmi_wwan.c

{QMI_GOBI_DEVICE(0x2C7C, 0x0125)}, /* Acer Gobi 2000 Modem device (VP413) */

1.3 添加零包機制

File: [KERNEL]/drivers/usb/serial/usb_wwan.c

static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint, int dir, void *ctx, char *buf, int len,void (*callback) (struct urb *)) { ……usb_fill_bulk_urb(urb, serial->dev,usb_sndbulkpipe(serial->dev, endpoint) | dir,buf, len, callback, ctx);//Added by Quectel for zero packetif (dir == USB_DIR_OUT) {struct usb_device_descriptor *desc = &serial->dev->descriptor;if (desc->idVendor == cpu_to_le16(0x2C7C) && desc->idProduct == cpu_to_le16(0x0125))urb->transfer_flags |= URB_ZERO_PACKET;}//End by Quectel for zero packetreturn urb; }

1.4 添加重置

File: [KERNEL]/drivers/usb/serial/option.c

static struct usb_serial_driver option_1port_device = { …… #ifdef CONFIG_PM .suspend = usb_wwan_suspend, .resume = usb_wwan_resume, //Added by Quectel.reset_resume = usb_wwan_resume, //End by Quectel #endif };

1.5 使用添加GobiNet

File: [KERNEL]/drivers/usb/serial/option.c

static int option_probe(struct usb_serial *serial, const struct usb_device_id *id) { struct usb_wwan_intf_private *data; …… //Added by Quectel if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C) && serial->dev->descriptor.idProduct == cpu_to_le16(0x0125) && serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)return -ENODEV; //End by Quectel /* Store device id so we can use it during attach. */ usb_set_serial_data(serial, (void *)id); return 0; }

1.6 模塊內核配置

二、? GobiNet驅動

2.1 模塊添加

2.2 添加程序

把Quectel_WCDMA&LTE_Linux&Android_GobiNet_Driver_V1.3.0.zip/src/目錄下的文件拷貝到 [KERNEL]/drivers/net/usb/ 下，makefile 和Readme.txt不拷貝，源碼下載：移遠模塊Linux下GobinNet驅動_quectel-CM-C代碼類資源-CSDN下載

修改[KERNEL]/drivers/net/usb/下的makefile，在文件最后添加

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

2.3 編譯內核

make ARCH=arm CROSS_COMPILE=arm-hisiv300-linux- uImage

三、? 環境變量配置

3.1、udhcpc配置：

把文件default.script拷貝到/usr/share/udhcpc/下：

把文件resolv.conf拷貝到/var/dvr/下，然后

ln ?-s ?/var/dvr/resolv.conf?? ?/etc/resolv.conf

3.2、撥號：

編譯quectel-CM程序源碼，編譯出quectel-CM工具進行撥號；

quectel-CM源碼下載：Linux下移遠4G模塊quectel-CM撥號工具_quectelag35開發板-C代碼類資源-CSDN下載

總結

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