### END ###

Interpretation of /proc/bus/usb info on 2.6 kernels:

/proc/bus/usb filesystem output

===============================

(version 2003.05.30)

The usbfs filesystem for USB devices is traditionally mounted at /proc/bus/usb. It provides the /proc/bus/usb/devices file, as well as the /proc/bus/usb/BBB/DDD files.

**NOTE**: If /proc/bus/usb appears empty, and a host controller driver has been linked, then you need to mount the filesystem. Issue the command (as root):

mount -t usbfs none /proc/bus/usb

An alternative and more

permanent method

would be

to add

none /proc/bus/usb

usbfs

defaults

0

0

 

 

 

to /etc/fstab.

This will mount usbfs

at

each

reboot.

You

can then issue ‘cat

/proc/bus/usb/devices‘

to

extract

USB

device information,

and user

mode

drivers

can

use usbfs

to interact with USB devices.

There are a number of mount options supported by usbfs. Consult the source code (linux/drivers/usb/core/inode.c) for information about those options.

**NOTE**: The filesystem has been renamed from "usbdevfs" to "usbfs", to reduce confusion with "devfs". You may still see references to the older "usbdevfs" name.

For more information on mounting the usbfs file system, see the "USB Device Filesystem" section of the USB Guide. The latest copy of the USB Guide can be found at http://www.linux-usb.org/

THE /proc/bus/usb/BBB/DDD FILES:

--------------------------------

Each connected USB device has one file. The BBB indicates the bus number. The DDD indicates the device address on that bus. Both of these numbers are assigned sequentially, and can be reused, so you can’t rely on them for stable access to devices. For example, it’s relatively common for devices to re-enumerate while they are still connected (perhaps someone jostled their power supply, hub,

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APC UPS control system manual Interpretation of /proc/bus/usb info on 2.6 kernels, 215
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UPS control system specifications

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