如何检测属于gsm/3g调制解调器的tty是数据端口还是控制端口? [英] How to I detect whether a tty belonging to a gsm/3g-modem is a data or control port?

问题描述

我目前正在为Linux路由器编写一个小工具，当我将适当的调制解调器插入其USB端口时，该工具将建立wwan(gsm/3g)连接.插入设备后，将注册多个tty，而我目前维护着制造商和设备的列表，以及已注册的哪个tty是控制/数据端口.

I'm currently writing a small tool for a linux router that sets up a wwan (gsm/3g) connection when I plug an appropriate modem into its USB port. When the device is plugged in several ttys are registered and I currently maintain a list of manufacturers and devices and which of their registered ttys is the control / data port.

如果可能的话，我想摆脱此列表，找到一种方法以某种方式直接探测已注册的tty，以检查它们是控制端口还是数据端口.

If possible I want to get rid of this list and find a way to somehow probe the registered ttys directly to check if they are a control port or a data port.

我检查了wvdial和modem-manager的源代码，以查看这些工具如何检测正确的端口，但无法找到合适的信息.我还尝试在sysfs中查找信息以区分端口，但这也不成功.

I examined the sourcecode of wvdial and modem-manager to see how these tools detect the right port but was unable to find suitable information. I also tried to look for information in sysfs to distinguish the ports but this wasn't successful either.

推荐答案

我使用此脚本获取3g usb加密狗的数据和控制端口.

I use this script to get Data and Control ports for 3g usb dongle.

#!/bin/sh

. /usr/share/libubox/jshn.sh

for a in `ls /sys/bus/usb/devices`; do
    local vendor product
    [ -z "$usb" -a -f /sys/bus/usb/devices/$a/idVendor -a -f /sys/bus/usb/devices/$a/idProduct ] || continue
    vendor=$(cat /sys/bus/usb/devices/$a/idVendor)
    product=$(cat /sys/bus/usb/devices/$a/idProduct)
    echo Vendor $vendor, Product $product
    [ -f /lib/network/wwan/$vendor:$product ] && {
        usb=/lib/network/wwan/$vendor:$product
        devicename=$a
        echo usb: $usb devicename: $devicename
    }
done

[ -n "$usb" ] && {
    local old_cb control data

    json_set_namespace wwan old_cb
    json_init
    json_load "$(cat $usb)"
    echo "$(cat $usb)"

    json_select
    json_get_vars desc control data
    json_set_namespace $old_cb

    [ -n "$control" -a -n "$data" ] && {
        ttys=$(ls -d /sys/bus/usb/devices/$devicename/${devicename}*/tty* | sed "s/.*\///g" | tr "\n" " ")

        ctl_device=$(echo $ttys | cut -d" " -f $((control + 1)))
        [ -n "$ctl_device" ] && ctl_device=/dev/$ctl_device
        dat_device=$(echo $ttys | cut -d" " -f $((data + 1)))
        [ -n "$dat_device" ] && dat_device=/dev/$dat_device
        echo control_device: $ctl_device, data_device: $dat_device
    }
}

样本输出:

已连接中兴MF667

Connected ZTE MF667

Vendor 1a40, Product 0101 #this is usb hub
Vendor 19d2, Product 0016
usb: /lib/network/wwan/19d2:0016 devicename: 1-1.2
{
        "desc": "ONDA MF110/ZTE",
        "control": 1,
        "data": 2
}}
control_device: /dev/ttyUSB1, data_device: /dev/ttyUSB2

已连接华为E3131

Connected Huawei E3131

Vendor 1a40, Product 0101 #this is usb hub
Vendor 12d1, Product 1506
usb: /lib/network/wwan/12d1:1506 devicename: 1-1.2
{
        "desc": "Huawei E367/E398",
        "control": 2,
        "data": 0
}}
control_device: /dev/ttyUSB2, data_device: /dev/ttyUSB0

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