[Pyusb-users] open device handle requires root access

[<Dan...@we...>]

Hi,

I have read the recent post about how to create a udev rule for a specific usb device in order to change its access rights, however, I have still trouble getting access to it without being root.

This is what I did.

Following the explanation here:

http://www.reactivated.net/writing_udev_rules.html

I plugged the device in and checked dmesg

--> usb 4-2: new high speed USB device using ehci_hcd and address 7

So I called now udevinfo:

> udevinfo -a -p /sys/bus/usb/devices/usb4/4-2/

and got this:

looking at class device '/sys/bus/usb/devices/usb4/4-2':
    KERNEL=="4-2"
    SUBSYSTEM=="unknown"
    SYSFS{bConfigurationValue}=="1"
    SYSFS{bDeviceClass}=="00"
    SYSFS{bDeviceProtocol}=="00"
    SYSFS{bDeviceSubClass}=="00"
    SYSFS{bMaxPacketSize0}=="64"
    SYSFS{bMaxPower}=="  0mA"
    SYSFS{bNumConfigurations}=="1"
    SYSFS{bNumInterfaces}==" 1"
    SYSFS{bcdDevice}=="0000"
    SYSFS{bmAttributes}=="40"
    SYSFS{configuration}==""
    SYSFS{devnum}=="7"
    SYSFS{idProduct}=="0003"
    SYSFS{idVendor}=="1443"
    SYSFS{manufacturer}=="Digilent"
    SYSFS{maxchild}=="0"
    SYSFS{product}=="USB Module"
    SYSFS{speed}=="480"
    SYSFS{version}==" 2.00"

What is strange about this is that the subsystem is set to unknown. Anyway, based on the explanation I should create the rule  based on the previous information and this is what I did:

    KERNEL=="4-2",SYSFS{idVendor}=="1443",SYSFS{idProduct}=="0003",GROUP="users",MODE="0660"

Added the rule to the 10-local.rules file in the /etc/udev/rules.d folder and called udevstart.

I am still cannot call my PyUsb program to open the device under my user name, who is part of the "users" group.

Am I doing something wrong here?

I am using PyUsb 0.4.0 with libusb 0.1.10a, linux kernel 2.6.13-15.16-default

Thanks for any help.

Cheers,

Guenter




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