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如何检测 USB 调制解调器的工作 ttyUSB

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如何检测 USB 调制解调器的工作 ttyUSB

我使用 OpenWRT 并需要设置 USB 3G 调制解调器。当我连接 USB 调制解调器时，我在日志中看到系统创建了四个 ttyUSB。为什么是四个？

Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.220000] usbserial_generic 1-1:1.0: The "generic" usb-serial driver is only for testing and one-off prototypes.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.230000] usbserial_generic 1-1:1.0: Tell [email protected] to add your device to a proper driver.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.240000] usbserial_generic 1-1:1.0: generic converter detected
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.280000] usb 1-1: generic converter now attached to ttyUSB0
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.280000] usbserial_generic 1-1:1.1: The "generic" usb-serial driver is only for testing and one-off prototypes.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.290000] usbserial_generic 1-1:1.1: Tell [email protected] to add your device to a proper driver.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.300000] usbserial_generic 1-1:1.1: generic converter detected
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.340000] usb 1-1: generic converter now attached to ttyUSB1
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.340000] usbserial_generic 1-1:1.2: The "generic" usb-serial driver is only for testing and one-off prototypes.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.350000] usbserial_generic 1-1:1.2: Tell [email protected] to add your device to a proper driver.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.360000] usbserial_generic 1-1:1.2: generic converter detected
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.440000] usb 1-1: generic converter now attached to ttyUSB2
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.450000] usbserial_generic 1-1:1.3: The "generic" usb-serial driver is only for testing and one-off prototypes.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.450000] usbserial_generic 1-1:1.3: Tell [email protected] to add your device to a proper driver.
Tue Jul 29 07:45:23 2014 kern.info kernel: [  580.460000] usbserial_generic 1-1:1.3: generic converter detected
Tue Jul 29 07:45:24 2014 kern.info kernel: [  580.500000] usb 1-1: generic converter now attached to ttyUSB3

之后我知道调制解调器正在工作。因此，我设置网络接口，必须选择一个可用的 ttyUSB。但我怎么知道哪个ttyUSB 正在工作呢？对于我运行的每个端口

gcom -d /dev/ttyUSB0 info
gcom -d /dev/ttyUSB1 info
etc...

用于查找工作端口。但这种方法不好，因为速度慢且难以解析。我应该编写一个 bash 脚本来检测调制解调器的工作 ttyUSB 并放入网络配置。我该怎么做？

我的路由器只有一个 USB 端口。每个 USB 3G 调制解调器使用不同的 ttyUSB 端口。

附言。我如何想象我可以向每个端口发送一些数据并检查结果。如果结果良好，则使用此ttyUSB。

答案1

我没有找到更好的方法来解析 gcom 命令结果。

## Search for a working USB port (/dev/ttyUSB)

work=false
for port in /dev/ttyUSB*
do
    [[ -e $port ]] || continue
    gcom -d $port info &> /tmp/testusb
    testUSB=`cat /tmp/testusb | grep "Error\|Can't"`
    if [ -z "$testUSB" ]; then 
        work=$port
        break
    fi
done
rm -rf /tmp/testusb

if [ $work != false ]; then
    echo "$work is working!"
else 
    echo 'Not found a working USB port'
fi

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