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libdevice-usb-perl - Perl module to access USB devices using libusb…  more info»


Device::USB::FAQ(User Contributed Perl DocumentDevice::USB::FAQ(3pm)

       Device::USB::FAQ - Frequently Asked Questions for Device::USB

       perldoc Device::USB::FAQ

       This is an attempt to answer some of the frequently asked
       questions about the Device::USB module

   Which platforms does Device::USB support?
       "Device:USB" supports any platform that "libusb" supports.
       This list currently includes Linux, FreeBSD, NetBSD, OpenBSD,
       Darwin, and MacOS X.

       There is a port of the "libusb" library to the Windows
       environment called "LibUsb-Win32". Because I don't have a
       development environment for testing this library,
       "Device::USB" does not yet support this library.

   Do I have to use Device::USB as root?
       By default, access to the USB devices on a Unix-based system
       appear to be limited to the root account. This usually causes
       access to most of the "libusb" features to fail with a
       permission error.

       Using the "Device::USB" module as root avoids this feature,
       but is not very satisfying from a security standpoint. (See
       the next question for more options.)

   How do I enable use of Device::USB as a non-root user?
       Some of the attributes of USB devices are available to non-
       root users, but accessing many of the more interesting
       features require special privileges.  According to the libusb
       source, the "open()" function requires either device nodes to
       be present or the usbfs file system to be mounted in specific
       locations. Those places in order are:

       1)  /dev/bus/usb  - pre-2.6.11: via devfs / post-2.6.11: via

       2)  /proc/bus/usb - usbfs

       Look in both locations on your system for which of these two
       methods your libusb will use.

       No matter which method your system uses, you will probably
       want to create a separate group to control access. Run this
       command to add a system group:

         addgroup --system usb


         groupadd --system usb

       You can then add users to that group to allow access to your
       usb devices.




       If you use Debian/Ubuntu, look in the
       /etc/udev/permissions.rules file.  If you want to allow
       global access to all usb devices, make this change:

       Change this:
         SUBSYSTEM=="usb_device", MODE="0664"

       To this:
         SUBSYSTEM=="usb_device", MODE="0664", GROUP="usb"

       After you reboot, all usb devices will inherit the mode and
       group specified.

       If you want to only change permissions for certain devices,
       you can add this on one line and adjust the product and
       vendor IDs:

         SUBSYSTEM=="usb_device", GROUP="usb", \
           SYSFS{idVendor}=="1234", SYSFS{idProduct}=="1234"


       The usbfs defaults to root as the user and group. This can be
       changed in the /etc/fstab by adding the following on one

         none /proc/bus/usb usbfs noauto,\
             0 0

       The value 118 in the above should be replaced with the group
       id of your usb group (created above). The list* values are to
       allow listing devices, the bus* is to control access to the
       bus directories and the dev* values control access to the
       device files. This approach does not allow the kind of
       granular permission that the udev approach gives, so it is
       all or nothing unless permissions are changed

       If your /etc/fstab file already has a line for /proc/bus/usb,
       add the options above to the line that is already there
       rather than adding the new line. For example, you would

         usbfs   /proc/bus/usb   usbfs   noauto  0 0


         usbfs   /proc/bus/usb   usbfs  noauto,\
             0 0

       Once again, this needs to be all on one line with the "\"
       characters removed.

       Device::USB and the "libusb" library site at

       G. Wade Johnson (wade at anomaly dot org) Paul Archer (paul
       at paularcher dot org)

       Houston Perl Mongers Group

       Thanks go to various users who submitted questions and
       answers for the list. In particular, Anthony L. Awtrey who
       contributed the first FAQ answer.

       Copyright 2006 Houston Perl Mongers

       This document is free software; you can redistribute it
       and/or modify it under the same terms as Perl itself.

perl v5.14.2                 2006-09-03        Device::USB::FAQ(3pm)
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