On Fri, 26 Jun 2009, Greg KH wrote:
> > > And again, what exactly is this device node, or link? What does:
> > > ls -l /dev/obdii
> > > show?
> >
> > crw-rw-rw- 1 root root 251, 29 2009-06-26 07:02 /dev/obdii
> >
> > and the node that libusb is using ...
>
> 251:29? What is major 251? What does /proc/devices/ show?
>
> > crw-rw-r-- 1 root root 189, 257 2009-06-26 07:02 /dev/bus/usb/003/002
>
> Yup, that's the device you need to be modifying.
>
> > and lsusb's view of the world, ...
> >
> > Bus 001 Device 004: ID 058f:6335 Alcor Micro Corp. SD/MMC Card Reader
> > Bus 001 Device 003: ID 13fe:1f00 Kingston Technology Company Inc. DataTraveler 2.0 4GB Flash Drive
> > Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> > Bus 005 Device 002: ID 0b05:b700 ASUSTek Computer, Inc.
> > Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > Bus 003 Device 002: ID 1808:5555 Multiplex Engineering OBDII to USB Interface
> > Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> > Bus 002 Device 002: ID 046d:c526 Logitech, Inc.
> > Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> >
> > the rule i am trying to make work, ...
> >
> > BUS=="usb", ATTRS{idVendor}=="1808", ATTRS{idProduct}=="5555", NAME="obdii", MODE="0666"
> >
> > note i removed the SYMLINK bit as that was a shot in the dark on my part thinking well,
> > maybe if i added the SYMLINK, it would link /dev/obdii to /dev/bus/usb/003/002, but that didnt work.
It sounds like Jack is looking for the proper udev rule to force
/dev/bus/usb/003/002 to be created with 0666 permissions. It's not
clear whether he wants /dev/obdii to be a separate device node, to be a
symlink to the original node, or not to exist at all.
Based on the existing libusb rule in
/lib/udev/rules.d/50-udev-default.rules, it looks like this should do
the trick:
SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device",
ATTRS{idVendor}=="1808", ATTRS{idProduct}=="5555", MODE="0666"
(all on one line, of course). And it should be in a file within
/etc/udev/rules.d numbered higher than 50, so that it applies _after_
the default rule.
Alan Stern
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