rk3588 区分两个相同的usb相机

有时候会插入两个一模一样的usb相机,担心每次启动他们所对应的设备节点 /dev/video* 会变化,所以需要绑定usb口,区分两个相机。把两个相机都插入后,查看usb信息

复制代码
root@rk3588:/# udevadm info --attribute-walk --name=/dev/video0

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/platform/fc800000.usb/usb1/1-1/1-1:1.0/video4linux/video0':
    KERNEL=="video0"
    SUBSYSTEM=="video4linux"
    DRIVER==""
    ATTR{dev_debug}=="0"
    ATTR{index}=="0"
    ATTR{name}=="USB Camera: USB Camera"

  looking at parent device '/devices/platform/fc800000.usb/usb1/1-1/1-1:1.0':
    KERNELS=="1-1:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="uvcvideo"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{authorized}=="1"
    ATTRS{iad_bFunctionClass}=="0e"
    ATTRS{iad_bInterfaceCount}=="02"
    ATTRS{bInterfaceSubClass}=="01"
    ATTRS{iad_bFunctionSubClass}=="03"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{iad_bFirstInterface}=="00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{iad_bFunctionProtocol}=="00"
    ATTRS{bInterfaceClass}=="0e"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{interface}=="USB Camera"

  looking at parent device '/devices/platform/fc800000.usb/usb1/1-1':
    KERNELS=="1-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{configuration}==""
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bDeviceClass}=="ef"
    ATTRS{bcdDevice}=="1001"
    ATTRS{bNumInterfaces}==" 2"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{manufacturer}=="VNV"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{authorized}=="1"
    ATTRS{speed}=="480"
    ATTRS{idProduct}=="c001"
    ATTRS{urbnum}=="32"
    ATTRS{devnum}=="2"
    ATTRS{product}=="USB Camera"
    ATTRS{maxchild}=="0"
    ATTRS{bmAttributes}=="80"
    ATTRS{bDeviceSubClass}=="02"
    ATTRS{bMaxPower}=="500mA"
    ATTRS{rx_lanes}=="1"
    ATTRS{removable}=="unknown"
    ATTRS{idVendor}=="1bcf"
    ATTRS{version}==" 2.00"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{tx_lanes}=="1"
    ATTRS{devspec}=="(null)"
    ATTRS{ltm_capable}=="no"
    ATTRS{devpath}=="1"
    ATTRS{busnum}=="1"
    ATTRS{quirks}=="0x0"

  looking at parent device '/devices/platform/fc800000.usb/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{configuration}==""
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bcdDevice}=="0510"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{manufacturer}=="Linux 5.10.110 ehci_hcd"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{authorized}=="1"
    ATTRS{speed}=="480"
    ATTRS{idProduct}=="0002"
    ATTRS{urbnum}=="23"
    ATTRS{devnum}=="1"
    ATTRS{product}=="EHCI Host Controller"
    ATTRS{maxchild}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPower}=="0mA"
    ATTRS{rx_lanes}=="1"
    ATTRS{removable}=="unknown"
    ATTRS{idVendor}=="1d6b"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{authorized_default}=="1"
    ATTRS{version}==" 2.00"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{serial}=="fc800000.usb"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{tx_lanes}=="1"
    ATTRS{ltm_capable}=="no"
    ATTRS{devpath}=="0"
    ATTRS{busnum}=="1"
    ATTRS{quirks}=="0x0"

  looking at parent device '/devices/platform/fc800000.usb':
    KERNELS=="fc800000.usb"
    SUBSYSTEMS=="platform"
    DRIVERS=="ehci-platform"
    ATTRS{companion}==""
    ATTRS{driver_override}=="(null)"
    ATTRS{uframe_periodic_max}=="100"

  looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""

通过 KERNELS=="1-1" (应该可以加更多信息来区分,没深入研究)可以区分usb相机对应的usb口,udev可以绑定usb相机到对应的usb

复制代码
root@rk3588:/# cat /etc/udev/rules.d/50-video.rules 
KERNEL =="video*",ATTR{index}=="0",KERNELS=="1-1",MODE:="0777",SYMLINK+="my_video0"
KERNEL =="video*",ATTR{index}=="0",KERNELS=="2-1",MODE:="0777",SYMLINK+="my_video1"

这样不管usb 0口插入的是哪个usb相机,它都对应 /dev/my_video0 节点,应用层访问该节点即可获取数据。

相关推荐
java叶新东老师2 小时前
git stash 命令详解
linux·运维·flink
写bug的羊羊3 小时前
CentOS 9 配置国内 YUM 源
linux·运维·centos
Johny_Zhao6 小时前
CentOS Stream 9上部署FTP应用服务的两种方法(传统安装和docker-compose)
linux·网络安全·信息安全·kubernetes·云计算·containerd·ftp·yum源·系统运维
守望时空337 小时前
RustDesk搭建指南
linux
C++ 老炮儿的技术栈7 小时前
在 Scintilla 中为 Squirrel 语言设置语法解析器的方法
linux·运维·c++·git·ubuntu·github·visual studio
白鹭7 小时前
基于LNMP架构的分布式个人博客搭建
linux·运维·服务器·网络·分布式·apache
java叶新东老师8 小时前
linux 部署 flink 1.15.1 并提交作业
linux·运维·flink
程序员JerrySUN9 小时前
Linux系统架构核心全景详解
linux·运维·系统架构
无敌的牛9 小时前
Linux文件理解,基础IO理解
linux·运维·服务器
未来之窗软件服务9 小时前
跨平台 WebSocket 服务器的设计与实现 —— 基于.NET 8 的跨操作系统解决方案linux,macos,windows——开发工具
linux·服务器·websocket·仙盟创梦ide·东方仙盟