本文介绍了一个具体的视频设备模块实例，该模块与USB设备关联，并详细展示了其在Linux系统中的路径映射，包括从内核模块到字符设备节点的完整路径。通过对/sys/class/video4linux/目录下的文件和符号链接进行分析，揭示了视频设备如何被系统识别和管理。
/proc/modules
uvcvideo 90112 0 - Live 0x0000000000000000
/sys/class/video4linux
/sys/class/video4linux/video0
video0 -> ../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.0/video4linux/video0
/dev/video0
crw-rw—-+ 1 root video 81, 0 11月 8 00:57 /dev/video0
/sys/dev/char/81:0/device/
/sys/dev/char/81:0/device/busnum
/sys/dev/char/81:0/device/devnum
/sys/dev/char/81:0/devnum
/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/1-1.6:1.0
/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/busnum
1
/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.6/devnum
3
/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/busnum
1
/sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/devnum
2
/sys/class/video4linux/video0/device/modalias
usb:v04F2pB221d0752dcEFdsc02dp01ic0Eisc01ip00in00
Vendor ID: 04F2
Product ID:B221
/sys/class/video4linux/video0/device/bInterfaceNumber
00
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