udev规则与几个父设备属性 [英] udev rule with few parent device attributes

问题描述

我需要复杂和通用的 udev 规则来确定USB设备插入任何USB集线器的某个端口。所以，我必须结合设备树的不同层的父属性...

I need complex and universal udev rule to determine USB-device plugged in certain port of the any USB hub. so, i have to combine parent attributes of different layers of the device tree...

我有这个：

$udevadm info --query=all --name=/dev/ttyUSB0 --attribute-walk

  looking at device '/devices/platform/bcm2708_usb/usb1/1-1/1-1.2/1-1.2.4/1-1.2.4:1.0/ttyUSB0/tty/ttyUSB0':
    KERNEL=="ttyUSB0"
    SUBSYSTEM=="tty"
    DRIVER==""

            . . .

  looking at parent device '/devices/platform/bcm2708_usb/usb1/1-1/1-1.2/1-1.2.4':
    KERNELS=="1-1.2.4"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
            ...

  looking at parent device '/devices/platform/bcm2708_usb/usb1/1-1/1-1.2':
    KERNELS=="1-1.2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{devpath}=="1.2"
    ATTRS{idVendor}=="0835"
            ...
    ATTRS{idProduct}=="8500"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="USB2.0 Hub"

            . . .

然后，我构建了udev规则，以识别某些USB集线器的某些端口：

Then i constructed udev rule something like this to identify certain port of certain USB hub:

KERNEL=="ttyUSB[0-9]*", KERNELS=="1-1.2.4", ATTRS{idVendor}=="0835", ATTRS{idProduct}=="8500", SYMLINK+="port1"

但它是当我尝试使用不同父层的属性时不工作。

But it's not working when i try to use attributes from different parent layers.

我知道udev仅支持来自一个特定父设备的附加属性。但是我真的需要得到结合我设备的两个父节点的属性的规则。

I know that udev supports additional attributes only from one particular parent device. But I really need to get the rule that combines attributes from 2 parent nodes of my device

有人可以提出解决方案吗？有没有办法得到它？

Could anybody suggest the solution? Is there any trick to get it?

推荐答案

经过许多不成功的经历，我找到了解决方案！

After many of unsuccessful experiences, i found the solution!

它的主要功能是设置环境变量：

The key feature of it is setting the environment variable:

1. 在插件事件中，我们查找 vendor：id pair并记住它在环境变量中。


2. 在同一个事件中，我们比较保存的变量和usb-device树节点ID以分配特定usb-hub的端口的确切名称。

1. On plugging event, we looking the vendor:id pair and remember it in environment variable.
2. On the same event, we compare the saved variable and usb-device tree nodes IDs to assign exact names of ports of certain usb-hub.

此文档帮助我 http://www.reactivated.net/writing_udev_rules.html

KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", SUBSYSTEMS=="usb", ATTRS{idVendor}=="05e3", ATTRS{idProduct}=="0610", ENV{USB_HUB_TYPE}="05e3:0610"
KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", SUBSYSTEMS=="usb", ATTRS{idVendor}=="0835", ATTRS{idProduct}=="8500", ENV{USB_HUB_TYPE}="0835:8500"
#
ENV{USB_HUB_TYPE}=="0835:8500", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].4:1.0", SYMLINK+="port1"
ENV{USB_HUB_TYPE}=="0835:8500", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].3:1.0", SYMLINK+="port2"
ENV{USB_HUB_TYPE}=="0835:8500", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].2:1.0", SYMLINK+="port3"
ENV{USB_HUB_TYPE}=="0835:8500", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].5.5:1.0", SYMLINK+="port4"
ENV{USB_HUB_TYPE}=="0835:8500", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].5.2:1.0", SYMLINK+="port5"
ENV{USB_HUB_TYPE}=="0835:8500", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].5.3:1.0", SYMLINK+="port6"
ENV{USB_HUB_TYPE}=="0835:8500", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].5.4:1.0", SYMLINK+="port7"
#
ENV{USB_HUB_TYPE}=="05e3:0610", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].1.1:1.0" SYMLINK+="port1"
ENV{USB_HUB_TYPE}=="05e3:0610", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].2:1.0", SYMLINK+="port2"
ENV{USB_HUB_TYPE}=="05e3:0610", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].1.2:1.0", SYMLINK+="port3"
ENV{USB_HUB_TYPE}=="05e3:0610", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].3:1.0", SYMLINK+="port4"
ENV{USB_HUB_TYPE}=="05e3:0610", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].1.3:1.0", SYMLINK+="port5"
ENV{USB_HUB_TYPE}=="05e3:0610", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].4:1.0", SYMLINK+="port6"
ENV{USB_HUB_TYPE}=="05e3:0610", KERNEL=="ttyUSB[0-9]*", SUBSYSTEM=="tty", KERNELS=="1-1.[2-3].1.4:1.0", SYMLINK+="port7"

这对某人来说是有用的。

Perhaps, it will be useful for someone.

这篇关于udev规则与几个父设备属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！