4G模块 EC20 R2.0 USB Serial/GobiNet/QMI WWAN 驱动移植过程
一、开发环境二、确定 EC20 R2.0 的基本信息三、USB Serial 驱动移植option 驱动qcserial 驱动四、GobiNet 驱动移植五、QMI WWAN 驱动移植参考资料一、开发环境
硬件平台：Jetson-TX24G模块：移远EC20 R2.0系统版本：Ubuntu 18.04.4 LTS (GNU/Linux 4.9.140-tegra aarch64)kernel ：4.9.140-tegra编译环境：aarch64-linux-gnu
二、确定 EC20 R2.0 的基本信息
插上4G模块，获得 VID 和 PID[ 11.877412] usb 1-2.4: new high-speed USB device number 4 using tegra-xusb[ 11.909529] usb 1-2.4: New USB device found, idVendor=2c7c, idProduct=0125[ 11.909535] usb 1-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0[ 11.909538] usb 1-2.4: Product: Android[ 11.909541] usb 1-2.4: Manufacturer: Android
$ lsusbBus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hubBus 001 Device 004: ID 2c7c:0125Bus 001 Device 002: ID 1a40:0101 Terminus Technology Inc. HubBus 001 Device 003: ID 03f0:1f4a Hewlett-PackardBus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
第二行可以看出：Vid = 2c7c, Pid = 0125
查看手册确定，可以支持的驱动类型
《Quectel_WCDMA<E_Linux_USB_Driver_User_Guide_V1.6.pdf》
usb-devices，查看EC20 usb接口信息
T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=01 Dev#= 4 Spd=480 MxCh= 0D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1P: Vendor=2c7c ProdID=0125 Rev=03.18S: Manufacturer=AndroidS: Product=AndroidC: #Ifs= 5 Cfg#= 1 Atr=a0 MxPwr=500mAI: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)I: If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)I: If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)I: If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)I: If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
可以看到EC20出现了5个usb接口，接口0-3需要适配 usb serial 驱动，通过 ttyUSB2 节点使用PPP拨号上网；接口4 需要适配 GobiNet or QMI WWAN 驱动，使用quectel-CM 应用上网。
三、USB Serial 驱动移植
usb串口驱动有两种适配方式，修改（[KERNEL]/drivers/usb/serial/）option.c或 qcserial.c 文件。
option.c：USB Driver for GSM modems
qcserial.c：Qualcomm Serial USB driver
option 驱动
TX2 板子使用的 kernel 已经支持 option.c 文件产生的 USB Serial Driver；对于不支持的 kernel ，按照如下方式修改。修改 [KERNEL]/drivers/usb/serial/option.c 支持EC20 R2.0
（1）添加 VID 和 PID
static const struct usb_device_id option_ids[] = {USB_DEVICE(0x2C7C, 0x0125), /* Quectel EC25/EC20 R2.0 */
（2）下面2个文件，需要删除 usb_device_id 数组中 VID 和 PID 的元素, 内核没有编译该文件或不加载 qcserial.ko / qmi_wwan.ko 的话，可以不用修改。
[KERNEL]/drivers/usb/serial/qcserial.c
[KERNEL]/drivers/net/usb/qmi_wwan.c
qmi_wwan.c 驱动和 option.c 驱动使用不同的usb接口，应该是不冲突的，但是参考手册说因为冲突需要删除。
（3）Add the Zero Packet Mechanism
（4）Add Reset Resume (掉电恢复)
备注：
(3) (4) 两项 TX2 kernel 源码中没有修改，应该对于4G上网功能影响不大，算是辅助功能，这里没有深入分析。
测试
（1）加载 option.ko并插上4G模块，dmesg信息如下
[ 11.959321] usbcore: registered new interface driver option[ 11.959363] usbserial: USB Serial support registered for GSM modem (1-port)[ 11.959476] option 1-2.4:1.0: GSM modem (1-port) converter detected[ 11.961727] usb 1-2.4: GSM modem (1-port) converter now attached to ttyUSB0[ 11.961823] option 1-2.4:1.1: GSM modem (1-port) converter detected[ 11.962035] usb 1-2.4: GSM modem (1-port) converter now attached to ttyUSB1[ 11.962152] option 1-2.4:1.2: GSM modem (1-port) converter detected[ 11.964814] usb 1-2.4: GSM modem (1-port) converter now attached to ttyUSB2[ 11.964905] option 1-2.4:1.3: GSM modem (1-port) converter detected[ 11.965171] usb 1-2.4: GSM modem (1-port) converter now attached to ttyUSB3
（2）AT命令测试
$ sudo busybox microcom -t 10000 -s 115200 /dev/ttyUSB3OKAT+QNWINFO+QNWINFO: "FDD LTE","46000","LTE BAND 3",1300OK$ sudo busybox microcom -t 10000 -s 115200 /dev/ttyUSB2AT+QNWINFO+QNWINFO: "FDD LTE","46000","LTE BAND 3",1300OK
使用ttyUSB3和ttyUSB2接口测试AT都正常
（3）使用PPP拨号，上网正常
TX2开发板使用的 Ubuntu 18.04 系统，其中网络管理中有 PPP 拨号功能，可以直接拨号；如没有，需在 kernel 中添加 PPP 支持并编译 ppp 源码。
PPP拨号后，ifconfig 命令可以看到，生成了ppp0网卡。
$ ifconfigppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500inet 10.192.118.96 netmask 255.255.255.255 destination 0.0.0.0ppp txqueuelen 3 (Point-to-Point Protocol)RX packets 11 bytes 126 (126.0 B)RX errors 0 dropped 0 overruns 0 frame 0TX packets 16 bytes 435 (435.0 B)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
使用 ps aux 命令，可以看到拨号的pppd进程，使用的是 ttyUSB2 接口拨号上网。
$ ps auxroot11488 0.2 0.0 160096 6564 ? Sl 17:17 0:00 /usr/sbin/pppd nodetach lock nodefaultroute ipv6 , user guest ttyUSB2 noipdefault noauth usepeerdns lcp-echo-failure 0 lcp-echo-interval 0 idle 0 ipparam /org/freedesktop/NetworkManager/PPP/2 plugin /usr/lib/pppd/2.4.7/nm-pppd-plugin.so
$ ping -I ppp0PING (125.39.52.26) from 10.192.118.96 ppp0: 56(84) bytes of data.64 bytes from no-data (125.39.52.26): icmp_seq=1 ttl=49 time=313 ms64 bytes from no-data (125.39.52.26): icmp_seq=2 ttl=49 time=95.3 ms64 bytes from no-data (125.39.52.26): icmp_seq=3 ttl=49 time=52.6 ms64 bytes from no-data (125.39.52.26): icmp_seq=4 ttl=49 time=63.8 ms64 bytes from no-data (125.39.52.26): icmp_seq=5 ttl=49 time=69.0 ms64 bytes from no-data (125.39.52.26): icmp_seq=6 ttl=49 time=85.8 ms^C--- ping statistics ---6 packets transmitted, 6 received, 0% packet loss, time 5007msrtt min/avg/max/mdev = 52.647/113.319/313.091/90.433 ms
qcserial 驱动
驱动适配修改 [KERNEL]/drivers/usb/serial/qcserial.c 支持EC20 R2.0
（1） 直接加载 qcserial.ko，若出现问题，请添加如下补丁
[ 11.723033] usbcore: registered new interface driver qcserial[ 11.723083] usbserial: USB Serial support registered for Qualcomm USB modem[ 11.723132] usb 1-2.4: unknown number of interfaces: 5
qcserial.c 补丁文件
It seems like this device has same vendor and product IDs as G2Kdevices, but it has different number of interfaces(4 vs 5) and alsodifferent interface layout which makes it currently unusable:usbcore: registered new interface driver qcserialusbserial: USB Serial support registered for Qualcomm USB modemusb 2-1.2: unknown number of interfaces: 5lsusb output:Bus 002 Device 003: ID 05c6:9215 Qualcomm, Inc. Acer Gobi 2000 WirelessDevice Descriptor:bLength 18bDescriptorType 1bcdUSB 2.00bDeviceClass 0 (Defined at Interface level)bDeviceSubClass 0bDeviceProtocol 0bMaxPacketSize0 64idVendor 0x05c6 Qualcomm, Inc.idProduct 0x9215 Acer Gobi 2000 Wireless ModembcdDevice 2.32iManufacturer 1 QuecteliProduct 2 Quectel LTE ModuleiSerial 0bNumConfigurations 1Configuration Descriptor:bLength 9bDescriptorType 2wTotalLength 209bNumInterfaces 5bConfigurationValue 1iConfiguration 0bmAttributes 0xa0(Bus Powered)Remote WakeupMaxPower 500mASigned-off-by: Petr Štetiar <ynezz@xxxxxxx>---drivers/usb/serial/qcserial.c | 39 +++++++++++++++++++++++++++++++++++++++1 file changed, 39 insertions(+)diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.cindex ebcec8c..d462132 100644--- a/drivers/usb/serial/qcserial.c+++ b/drivers/usb/serial/qcserial.c@@ -22,6 +22,8 @@#define DRIVER_AUTHOR "Qualcomm Inc"#define DRIVER_DESC "Qualcomm USB Serial driver"+#define QUECTEL_EC20_IDPRODUCT 0x9215+/* standard device layouts supported by this driver */enum qcserial_layouts {QCSERIAL_G2K = 0, /* Gobi 2000 */@@ -167,6 +169,38 @@ static const struct usb_device_id id_table[] = {};MODULE_DEVICE_TABLE(usb, id_table);+static int handle_quectel_ec20(struct device *dev, int ifnum)+{+ int altsetting = 0;++ /*+ * Quectel EC20 Mini PCIe LTE module layout:+ * 0: DM/DIAG (use libqcdm from ModemManager for communication)+ * 1: NMEA+ * 2: AT-capable modem port+ * 3: Modem interface+ * 4: NDIS+ */+ switch (ifnum) {+ case 0:+ dev_dbg(dev, "Quectel EC20 DM/DIAG interface found\n");+ break;+ case 1:+ dev_dbg(dev, "Quectel EC20 NMEA GPS interface found\n");+ break;+ case 2:+ case 3:+ dev_dbg(dev, "Quectel EC20 Modem port found\n");+ break;+ case 4:+ /* Don't claim the QMI/net interface */+ altsetting = -1;+ break;+ }++ return altsetting;+}+static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id){struct usb_host_interface *intf = serial->interface->cur_altsetting;@@ -235,6 +269,11 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)altsetting = -1;break;case QCSERIAL_G2K:+ if (nintf == 5 && id->idProduct == QUECTEL_EC20_IDPRODUCT) {+ altsetting = handle_quectel_ec20(dev, ifnum);+ goto done;+ }+/** Gobi 2K+ USB layout:* 0: QMI/net--1.7.9.5--To unsubscribe from this list: send the line "unsubscribe linux-usb" inthe body of a message to majordomo@xxxxxxxxxxxxxxxMore majordomo info at /majordomo-info.html
（2） 添加 VID 和 PID
static const struct usb_device_id id_table[] = {{USB_DEVICE(0x2C7C, 0x0125)}, /* Quectel EC25/EC20 R2.0 */
（3） EC20 R2.0 特殊处理
在 qcserial.c 补丁中针对 Gobi 2000 中 EC20进行了特殊处理。
补丁中使用的EC20 PID 是 0x9215, 临时将其修改为EC20 R2.0 PID 0x0125进行测试；正式版本请对 0x0125 PID 适配，请自行修改。
#define QUECTEL_EC20_IDPRODUCT 0x9215修改为：#define QUECTEL_EC20_IDPRODUCT 0x0125
（4）下面1个文件，需要删除 usb_device_id 数组中 VID 和 PID 的元素, 若内核没有编译该文件或不加载 option.ko 的话，可以不用修改。
File: [KERNEL]/drivers/usb/serial/option.cstatic const struct usb_device_id option_ids[] = {USB_DEVICE(QUECTEL_VENDOR_ID, QUECTEL_PRODUCT_EC25), /* 0x2C7C, 0x0125 */
上网测试
（1）加载 qcserial.ko并插上4G模块，dmesg信息如下
[ 11.987527] usbcore: registered new interface driver qcserial[ 11.987573] usbserial: USB Serial support registered for Qualcomm USB modem[ 11.993842] qcserial 1-2.4:1.0: Qualcomm USB modem converter detected[ 11.994090] usb 1-2.4: Qualcomm USB modem converter now attached to ttyUSB0[ 12.002639] qcserial 1-2.4:1.1: Qualcomm USB modem converter detected[ 12.002902] usb 1-2.4: Qualcomm USB modem converter now attached to ttyUSB1[ 12.011237] qcserial 1-2.4:1.2: Qualcomm USB modem converter detected[ 12.011480] usb 1-2.4: Qualcomm USB modem converter now attached to ttyUSB2[ 12.012202] qcserial 1-2.4:1.3: Qualcomm USB modem converter detected[ 12.012441] usb 1-2.4: Qualcomm USB modem converter now attached to ttyUSB3
（2）AT命令测试
$ sudo busybox microcom -t 10000 -s 115200 /dev/ttyUSB3OKAT+QNWINFO+QNWINFO: "FDD LTE","46000","LTE BAND 3",1300OK
（3）使用PPP拨号，上网正常
TX2开发板使用的 Ubuntu 18.04 系统，其中网络管理中有 PPP 拨号功能，可以直接拨号；如没有，需在 kernel 中添加 PPP 支持并编译 ppp 源码。
$ ifconfigppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500inet 10.46.1.65 netmask 255.255.255.255 destination 0.0.0.0ppp txqueuelen 3 (Point-to-Point Protocol)RX packets 27 bytes 1705 (1.7 KB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 45 bytes 2658 (2.6 KB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0$ ping -I ppp0PING (125.39.52.26) from 10.46.1.65 ppp0: 56(84) bytes of data.64 bytes from no-data (125.39.52.26): icmp_seq=1 ttl=49 time=166 ms64 bytes from no-data (125.39.52.26): icmp_seq=2 ttl=49 time=102 ms64 bytes from no-data (125.39.52.26): icmp_seq=3 ttl=49 time=75.0 ms64 bytes from no-data (125.39.52.26): icmp_seq=4 ttl=49 time=79.0 ms64 bytes from no-data (125.39.52.26): icmp_seq=5 ttl=49 time=104 ms64 bytes from no-data (125.39.52.26): icmp_seq=6 ttl=49 time=78.0 ms^C--- ping statistics ---6 packets transmitted, 6 received, 0% packet loss, time 5001msrtt min/avg/max/mdev = 75.021/100.917/166.559/31.615 ms
四、GobiNet 驱动移植
驱动适配（1）将 GobiNet 源码拷贝到 [KERNEL]/drivers/net/usb 目录
（2）修改该目录下的 makefile 文件，添加如下代码
obj-$(CONFIG_USB_GOBI_NET) += GobiNet.oGobiNet-y := GobiUSBNet.o QMIDevice.o QMI.o
（3）修改该目录下的Kconfig文件，添加如下代码
config USB_GOBI_NETtristate "Gobi USB Net driver for Quectel moudule"helpSupport Quectel moudule
（4）编译 kernel 或 GobiNet.ko
找到 USB_GOBI_NET 配置, 将他编入内核(y)或编成模块(m)
$ make ARCH=arm64 menuconfig │Symbol: USB_GOBI_NET [=y] ││ Type : tristate ││ Prompt: Gobi USB Net driver for Quectel moudule││ Location: ││ -> Device Drivers││ -> Network device support (NETDEVICES [=y]) ││ (1) -> USB Network Adapters (USB_NET_DRIVERS [=y]) ││ Defined at drivers/net/usb/Kconfig:610 ││ Depends on: NETDEVICES [=y] && USB_NET_DRIVERS [=y]│
上网测试
（1）加载 GobiNet.ko 并插上4G模块，dmesg信息如下
[ 5166.598656] usb 1-2.4: new high-speed USB device number 4 using tegra-xusb[ 5166.631145] usb 1-2.4: New USB device found, idVendor=2c7c, idProduct=0125[ 5166.631198] usb 1-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0[ 5166.631513] usb 1-2.4: Product: Android[ 5166.631530] usb 1-2.4: Manufacturer: Android[ 5166.643823] GobiNet 1-2.4:1.4 eth1: register 'GobiNet' at usb-3530000.xhci-2.4, GobiNet Ethernet Device, 12:65:51:00:62:cd[ 5166.648392] creating qcqmi1[ 5166.728113] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready[ 5166.729237] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
使用 ifconfig 命令可看到出现了 eth1 网卡，但是没有设置ip地址。
$ ifconfigeth1: flags=4227<UP,BROADCAST,NOARP,MULTICAST> mtu 1500ether 12:65:51:00:62:cd txqueuelen 1000 (Ethernet)RX packets 0 bytes 0 (0.0 B)RX errors 0 dropped 0 overruns 0 frame 0TX packets 0 bytes 0 (0.0 B)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
（2）使用 quectel-CM 应用上网
$ sudo ./quectel-CM -s ctnet&[09-21_13:45:36:250] Quectel_Linux_ConnectManager_SR01A01V23[09-21_13:45:36:251] ./quectel-CM profile[1] = ctnet///0, pincode = (null)[09-21_13:45:36:252] Find qmichannel = /dev/qcqmi1[09-21_13:45:36:252] Find usbnet_adapter = eth1[09-21_13:45:36:306] Get clientWDS = 7[09-21_13:45:36:338] Get clientDMS = 8[09-21_13:45:36:370] Get clientNAS = 9[09-21_13:45:36:402] Get clientUIM = 10[09-21_13:45:36:435] Get clientWDA = 11[09-21_13:45:36:467] requestBaseBandVersion EC20CEHCLGR06A03M1G[09-21_13:45:36:530] requestGetSIMStatus SIMStatus: SIM_READY --- 检测到SIM卡[09-21_13:45:36:531] requestSetProfile[1] ctnet///0[09-21_13:45:36:595] requestGetProfile[1] ctnet///0[09-21_13:45:36:627] requestRegistrationState2 MCC: 460, MNC: 0, PS: Attached, DataCap: LTE[09-21_13:45:36:659] requestQueryDataCall ConnectionStatus: DISCONNECTED[09-21_13:45:36:724] requestRegistrationState2 MCC: 460, MNC: 0, PS: Attached, DataCap: LTE[09-21_13:45:36:756] requestSetupDataCall WdsConnectionIPv4Handle: 0x08d21410[09-21_13:45:36:851] requestQueryDataCall ConnectionStatus: CONNECTED[09-21_13:45:36:902] Fail to access /usr/share/udhcpc/default.script, errno: 2 (No such file or directory) // 使用的是 /etc/udhcpc/default.script 目录下的脚本udhcpc: started, v1.27.2[09-21_13:45:36:927] Setting IP address 0.0.0.0 on eth1udhcpc: sending discoverudhcpc: sending select for 10.39.110.92udhcpc: lease of 10.39.110.92 obtained, lease time 7200 // 获取到了ip地址[09-21_13:45:37:110] Setting IP address 10.39.110.92 on eth1+: Unknown host[09-21_13:45:37:117] Deleting routers // 调用default.script脚本设置ip、路由和DNSSIOCDELRT: No such process[09-21_13:45:37:124] Adding router 10.39.110.93[09-21_13:45:37:127] Recreating /etc/resolv.conf[09-21_13:45:37:132] Adding DNS server 211.137.130.2[09-21_13:45:37:132] Adding DNS server 211.137.130.18[09-21_13:45:40:723] requestRegistrationState2 MCC: 460, MNC: 0, PS: Attached, DataCap: LTE
如出现问题请参考：
linux 4G模块(EC20 R2.0)调试记录
（3）测试联网
ping -I eth1PING (112.53.26.232) from 10.39.110.92 eth1: 56(84) bytes of data.64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=1 ttl=53 time=82.2 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=2 ttl=53 time=59.4 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=3 ttl=53 time=68.9 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=4 ttl=53 time=77.1 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=5 ttl=53 time=84.3 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=6 ttl=53 time=67.3 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=7 ttl=53 time=81.3 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=8 ttl=53 time=76.5 ms^C--- ping statistics ---8 packets transmitted, 8 received, 0% packet loss, time 7012msrtt min/avg/max/mdev = 59.469/74.675/84.377/8.086 ms
注意：
看到网上的帖子和手册，需要同时适配 USB Serial Driver 和 GobiNet Driver。屏蔽 USB Serial Driver 驱动，只保留 GobiNet Driver 也上网正常。但是我们需要获取4G网卡的网络状态等，可以通过 USB Serial 使用 AT 命令获取网络状态。能否使用 GobiNet 获取网络状态，我也不清楚。如果可以的话，只使用GobiNet Driver就可以了。
五、QMI WWAN 驱动移植
TX2 板子使用的 kernel 已经支持 qmi_wwan.c 文件产生的 QMI WWAN Driver；对于不支持的 kernel ，按照如下方式修改。修改 [KERNEL]/drivers//drivers/net/usb/qmi_wwan.c 支持EC20 R2.0
（1）添加 VID 和 PID
static const struct usb_device_id products[] = {#if 1 //Added by Quectel#ifndef QMI_FIXED_INTF/* map QMI/wwan function by a fixed interface number */#define QMI_FIXED_INTF(vend, prod, num) \.match_flags = USB_DEVICE_ID_MATCH_DEVICE |USB_DEVICE_ID_MATCH_INT_INFO, \.idVendor = vend, \.idProduct = prod, \.bInterfaceClass = 0xff, \.bInterfaceSubClass = 0xff, \.bInterfaceProtocol = 0xff, \.driver_info = (unsigned long)&qmi_wwan_force_int##num,#endif{QMI_FIXED_INTF(0x2C7C, 0x0125, 4) }, /* Quectel EC25/EC20 R2.0 */#endif
（2）Add Support for Raw IP Mode for EC21/EC25/EC20 R2.0
需要添加的代码过长，请参考文档。
（3）将该文件编入内核或编译成模块
Enable CONFIG_USB_NET_QMI_WWAN
[*] Device Drivers →-*- Network device support →USB Network Adapters →{*} Multi-purpose USB Networking Framework<*> QMI WWAN driver for Qualcomm MSM based 3G and LTE modems
注意：
qmi_wwan.ko 依赖 cdc-wdm.ko，需要将 cdc-wdm.c 编入内核或编译成模块
上网测试
（1）加载 qmi_wwan.ko 并插上4G模块，dmesg信息如下
[ 11.877289] usb 1-2.4: new high-speed USB device number 4 using tegra-xusb[ 11.909334] usb 1-2.4: New USB device found, idVendor=2c7c, idProduct=0125[ 11.909339] usb 1-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0[ 11.909342] usb 1-2.4: Product: Android[ 11.909344] usb 1-2.4: Manufacturer: Android[ 227.572656] qmi_wwan 1-2.4:1.4: cdc-wdm0: USB WDM device[ 227.574819] qmi_wwan 1-2.4:1.4 wwan0: register 'qmi_wwan' at usb-3530000.xhci-2.4, WWAN/QMI device, fa:fb:f9:d2:f3:ed[ 227.574917] usbcore: registered new interface driver qmi_wwan
（2）查看文件节点
/sys/class/net$ lsdummy0 eth0 l4tbr0 lo rndis0 usb0 wlan0 wwan0$ls /dev/cdc-wdm0/dev/cdc-wdm0wwan0 是网卡文件，现在使用ifconfig，看不到这个网卡。cdc-wdm0 是驱动的设备节点。
（3）使用 quectel-CM 应用上网
sudo ./quectel-CM -s ctnet&[09-22_14:31:14:170] Quectel_Linux_ConnectManager_SR01A01V23[09-22_14:31:14:170] ./quectel-CM profile[1] = ctnet///0, pincode = (null)[09-22_14:31:14:172] Find qmichannel = /dev/cdc-wdm0[09-22_14:31:14:172] Find usbnet_adapter = wwan0[09-22_14:31:14:194] /proc/7368/fd/7 -> /dev/cdc-wdm0[09-22_14:31:14:194] /proc/7368/exe -> /usr/lib/libqmi/qmi-proxy[09-22_14:31:16:207] cdc_wdm_fd = 7[09-22_14:31:16:292] Get clientWDS = 18[09-22_14:31:16:324] Get clientDMS = 2[09-22_14:31:16:356] Get clientNAS = 3[09-22_14:31:16:388] Get clientUIM = 1[09-22_14:31:16:420] Get clientWDA = 1[09-22_14:31:16:452] requestBaseBandVersion EC20CEHCLGR06A03M1G[09-22_14:31:16:516] requestGetSIMStatus SIMStatus: SIM_READY[09-22_14:31:16:517] requestSetProfile[1] ctnet///0[09-22_14:31:16:580] requestGetProfile[1] ctnet///0[09-22_14:31:16:612] requestRegistrationState2 MCC: 460, MNC: 0, PS: Attached, DataCap: LTE[09-22_14:31:16:644] requestQueryDataCall ConnectionStatus: DISCONNECTED[09-22_14:31:16:708] requestRegistrationState2 MCC: 460, MNC: 0, PS: Attached, DataCap: LTE[09-22_14:31:16:740] requestSetupDataCall WdsConnectionIPv4Handle: 0xe17c8590[09-22_14:31:16:804] requestQueryDataCall ConnectionStatus: CONNECTED[09-22_14:31:16:850] Fail to access /usr/share/udhcpc/default.script, errno: 2 (No such file or directory)udhcpc: started, v1.27.2[09-22_14:31:16:869] Setting IP address 0.0.0.0 on wwan0udhcpc: sending discoverudhcpc: sending select for 10.112.217.14udhcpc: lease of 10.112.217.14 obtained, lease time 7200[09-22_14:31:16:989] Setting IP address 10.112.217.14 on wwan0[09-22_14:31:17:002] Deleting routersSIOCDELRT: No such process[09-22_14:31:17:006] Adding router 10.112.217.13[09-22_14:31:17:010] Recreating /etc/resolv.conf[09-22_14:31:17:017] Adding DNS server 211.137.130.18[09-22_14:31:17:017] Adding DNS server 211.137.130.2
（3）测试联网
此时使用 ifconfig 命令，就可以看见 wwan0 网卡，并设置好了IP
wwan0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500inet 10.112.217.14 netmask 255.255.255.252 destination 10.112.217.14inet6 fe80::65af:a0e9:a8ae:4a3d prefixlen 64 scopeid 0x20<link>unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)RX packets 76 bytes 8826 (8.8 KB)RX errors 0 dropped 0 overruns 0 frame 0TX packets 88 bytes 6624 (6.6 KB)TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0$ ping -I wwan0PING (112.53.26.232) from 10.228.222.241 wwan0: 56(84) bytes of data.64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=1 ttl=53 time=72.4 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=2 ttl=53 time=90.7 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=3 ttl=53 time=72.1 ms64 bytes from 112.53.26.232 (112.53.26.232): icmp_seq=4 ttl=53 time=125 ms^C--- ping statistics ---4 packets transmitted, 4 received, 0% packet loss, time 3005msrtt min/avg/max/mdev = 72.179/90.169/125.290/21.639 ms
