【Centos7】如何静态名称下绑定USB设备

问题：
有多个摄像头，需要每次设备启动，固定的摄像头的设备号都不变（video0 video1 video2 每次都对应之前的摄像头）

  • 每个USB都有个编号，确保插入的USB不变更，或者大小顺序不变，每次重启，内核设备号是从USB编号从小到大依次编号的。

可以通过以下命令查看video设备对应的设备号：

You have new mail in /var/spool/mail/root
[root@localhost SD_IR]# ls -lR /dev/ |grep video
crw-rw----. 1 root video    81,   0 Mar 30 22:17 video0
crw-rw----. 1 root video    81,   1 Mar 30 22:17 video1
crw-rw----. 1 root video    81,   2 Mar 30 22:17 video2
lrwxrwxrwx. 1 root root  9 Mar 30 22:17 81:0 -> ../video0
lrwxrwxrwx. 1 root root  9 Mar 30 22:17 81:1 -> ../video1
lrwxrwxrwx. 1 root root  9 Mar 30 22:17 81:2 -> ../video2
lrwxrwxrwx. 1 root root 12 Mar 30 22:17 usb-HD_Camera_Manufacturer_USB_2.0_Camera-video-index0 -> ../../video0
lrwxrwxrwx. 1 root root 12 Mar 30 22:17 pci-0000:00:14.0-usb-0:1:1.0-video-index0 -> ../../video0
lrwxrwxrwx. 1 root root 12 Mar 30 22:17 pci-0000:00:14.0-usb-0:2:1.0-video-index0 -> ../../video1
lrwxrwxrwx. 1 root root 12 Mar 30 22:17 pci-0000:00:14.0-usb-0:6:1.0-video-index0 -> ../../video2

可以看到，video0对应的USB为pci-0000:00:14.0-usb-0:1:1.0-video-index0
video1对应的USB为pci-0000:00:14.0-usb-0:2:1.0-video-index0
video2对应的USB为pci-0000:00:14.0-usb-0:6:1.0-video-index0

usb-0:1 usb-0:2 usb-0:6 这个跟USB是一一对应的，每次重启不会变。

  • 修改udev rules的方法：

检查设备video0的变量：

[root@localhost SD_IR]# udevadm info -a -p  $(udevadm info -q path -n /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/pci0000:00/0000:00:14.0/usb3/3-1/3-1:1.0/video4linux/video0':
    KERNEL=="video0"
    SUBSYSTEM=="video4linux"
    DRIVER==""
    ATTR{name}=="USB 2.0 Camera"
    ATTR{debug}=="0"
    ATTR{index}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-1/3-1:1.0':
    KERNELS=="3-1:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="uvcvideo"
    ATTRS{bInterfaceClass}=="0e"
    ATTRS{iad_bFunctionClass}=="0e"
    ATTRS{iad_bFirstInterface}=="00"
    ATTRS{bInterfaceSubClass}=="01"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{iad_bFunctionSubClass}=="03"
    ATTRS{iad_bFunctionProtocol}=="00"
    ATTRS{authorized}=="1"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{iad_bInterfaceCount}=="02"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{interface}=="HD USB Camera"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-1':
    KERNELS=="3-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="02"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="1"
    ATTRS{idVendor}=="05a3"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 2"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="3"
    ATTRS{devnum}=="2"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="500mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="80"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0100"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="54163754"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="HD Camera Manufacturer"
    ATTRS{removable}=="removable"
    ATTRS{idProduct}=="9230"
    ATTRS{bDeviceClass}=="ef"
    ATTRS{product}=="USB 2.0 Camera"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3':
    KERNELS=="usb3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="3"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="12"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bcdDevice}=="0310"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="0000:00:14.0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="417"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 3.10.0-693.el7.x86_64 xhci-hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="xHCI Host Controller"

  looking at parent device '/devices/pci0000:00/0000:00:14.0':
    KERNELS=="0000:00:14.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="xhci_hcd"
    ATTRS{irq}=="28"
    ATTRS{subsystem_vendor}=="0x8086"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x0c0330"
    ATTRS{driver_override}=="(null)"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{local_cpus}=="f"
    ATTRS{device}=="0x8c31"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}==""
    ATTRS{local_cpulist}=="0-3"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x8c31"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

检查设备video1的变量：

[root@localhost SD_IR]# udevadm info -a -p  $(udevadm info -q path -n /dev/video1)

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/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0/video4linux/video1':
    KERNEL=="video1"
    SUBSYSTEM=="video4linux"
    DRIVER==""
    ATTR{name}=="USB 2.0 Camera"
    ATTR{debug}=="0"
    ATTR{index}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-2/3-2:1.0':
    KERNELS=="3-2:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="uvcvideo"
    ATTRS{bInterfaceClass}=="0e"
    ATTRS{iad_bFunctionClass}=="0e"
    ATTRS{iad_bFirstInterface}=="00"
    ATTRS{bInterfaceSubClass}=="01"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bNumEndpoints}=="01"
    ATTRS{iad_bFunctionSubClass}=="03"
    ATTRS{iad_bFunctionProtocol}=="00"
    ATTRS{authorized}=="1"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{iad_bInterfaceCount}=="02"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{interface}=="HD USB Camera"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-2':
    KERNELS=="3-2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="02"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="2"
    ATTRS{idVendor}=="05a3"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 2"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{busnum}=="3"
    ATTRS{devnum}=="3"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="500mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="80"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0100"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="53656605"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="HD Camera Manufacturer"
    ATTRS{removable}=="removable"
    ATTRS{idProduct}=="9230"
    ATTRS{bDeviceClass}=="ef"
    ATTRS{product}=="USB 2.0 Camera"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3':
    KERNELS=="usb3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="480"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="3"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="12"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bcdDevice}=="0310"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="0000:00:14.0"
    ATTRS{version}==" 2.00"
    ATTRS{urbnum}=="417"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 3.10.0-693.el7.x86_64 xhci-hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0002"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="xHCI Host Controller"

  looking at parent device '/devices/pci0000:00/0000:00:14.0':
    KERNELS=="0000:00:14.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="xhci_hcd"
    ATTRS{irq}=="28"
    ATTRS{subsystem_vendor}=="0x8086"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x0c0330"
    ATTRS{driver_override}=="(null)"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{local_cpus}=="f"
    ATTRS{device}=="0x8c31"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}==""
    ATTRS{local_cpulist}=="0-3"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x8c31"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

对比发现不同的是(每个摄像头的urbnum都不一样，显然通过设置udev rules的方法不通用)：

ATTRS{urbnum}=="53656605"

对于udev rules的设置详细可参考：
http://www.reactivated.net/writing_udev_rules.html

©著作权归作者所有,转载或内容合作请联系作者
【社区内容提示】社区部分内容疑似由AI辅助生成，浏览时请结合常识与多方信息审慎甄别。
平台声明：文章内容（如有图片或视频亦包括在内）由作者上传并发布，文章内容仅代表作者本人观点，简书系信息发布平台，仅提供信息存储服务。

相关阅读更多精彩内容

友情链接更多精彩内容