如何在Ubuntu 10.1下识别多个USB串行适配器 [英] How to identify multiple USB-serial adapters under Ubuntu 10.1

问题描述

我正在Ubuntu 10.1下从多个相同的USB串行适配器读取数据.

I am reading data from multiple identical USB-serial adapters under Ubuntu 10.1.

有时，它们的/dev/tty路径会更改(例如，如果在启动时连接了其他USB设备).

On occasion, their /dev/tty path changes (eg if other USB devices are connected on startup).

我需要一种通过任何此类更改重复引用同一适配器的方法.

I need a way of repeatedly referring to the same adapter through any such changes.

根据udevadm，所有设备的序列号都相同.

The devices all have the same serial numbers, according to udevadm.

我认为最可能的选择是识别适配器所连接的端口(它们不会四处移动).

I think the most likely option is to identify an adapter by which port it is connected to (they don't get moved around).

我可以找到各种可能有用的/dev路径，但是尽管在线上有很多有关udev的讨论，但是如果将设备插入静态，我无法找到关于其中某些路径是否静态的明确声明端口.

I can find all sorts of interesting /dev paths that might work, but despite all the discussion about udev online, I can't locate a definitive statement about whether some of these paths are static if the device is plugged into a static port.

推荐答案

有一个解决方案.最好迟到再也不要;)

There is a solution. It's better late then never ;)

使用以下udev规则将/dev/ttyUSB{?}设备映射到/dev/usb-ports/%bus_id-%port_id链接.

Use the following udev rule to map /dev/ttyUSB{?} devices into the /dev/usb-ports/%bus_id-%port_id link.

这是我的/etc/udev/rules.d/usb-parse-devpath.rules:

ACTION=="add", KERNEL=="ttyUSB[0-9]*", PROGRAM="/etc/udev/rules.d/usb-parse-devpath.pm %p", SYMLINK+="usb-ports/%c"

和usb-parse-devpath.pm脚本:

#!/usr/bin/perl -w

@items = split("/", $ARGV[0]);
for ($i = 0; $i < @items; $i++) {
    if ($items[$i] =~ m/^usb[0-9]+$/) {
        print $items[$i + 1] . "\n";
        last;
    }
}

如您所见，这有助于我们创建指向/dev/ttyUSB{?}设备的命名链接，并将它们以以下格式放置在/dev/usb-ports上:.

As you can see this helps us to create named links to /dev/ttyUSB{?} devices and place them at /dev/usb-ports in the following format: bus_id-port_id.

例如，下一条命令给我以下内容:

For example, the next command gives me the following:

$ udevadm info --query=path --name=/dev/ttyUSB0
/devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB0/tty/ttyUSB0

因此，bus_id是3，port_id是1，现在我在/dev/usb-ports中有以下内容:

So, the bus_id is 3 and port_id is 1 and now I have following in my /dev/usb-ports:

$ ls -al /dev/usb-ports
lrwxrwxrwx  1 root root   10 Май 12 00:26 3-1 -> ../ttyUSB0

致谢.

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