解决/proc/bus/usb/目录下没有devices文件问题

$cat /proc/bus/usb/devices

cat: /proc/bus/usb/devices: 沒有此一檔案或目錄

方法一

$ sudo mount -t usbfs usbfs /proc/bus/usb/

保證usbfs是挂载在/proc/bus/usb上的

方法二

可以用lsusb命令查看，運行lsusb -v可以看到很多瑣碎資料

Usage: lsusb [options]...

List USB devices

-v, --verbose

Increase verbosity (show descriptors)

-s [[bus]:][devnum]

Show only devices with specified device and/or

bus numbers (in decimal)

-d vendor:[product]

Show only devices with the specified vendor and

product ID numbers (in hexadecimal)

-D device

Selects which device lsusb will examine

-t

Dump the physical USB device hierarchy as a tree

-V, --version

Show version of program

方法三

sudo mount --bind /dev/bus /proc/bus sudo ln -s /sys/kernel/debug/usb/devices /proc/bus/usb/devices