On Tuesday 02 May 2006 18:27, Wittawat Yamwong wrote:
> 2. If your libusb doesn't properly open a device node under /dev/bus/usb/
> (like mine; libusb bug?) but works correctly with usbfs in /proc/bus/usb/,
> add the following line to your udev configuration file (It works at least
> on my system):
>
> SUBSYSTEM=="usb", ACTION=="add", ENV{PRODUCT}=="<VID>/<PID>/*",
> RUN+="/bin/sh -c '/bin/chgrp scanner $env{DEVICE}; /bin/chmod 664
> $env{DEVICE}'"
>
> Replace <VID> and <PID> with the correct USBID of your scanner and check
> the group and permission if it matches your system. See udev man page
> and /usr/src/linux/Documentation/usb/hotplug.txt for more info.
This sounds similar to my issue. sane-find-scanner produces:
found USB scanner (vendor=0x04b8, product=0x011d, chip=LM983x?) at
libusb:001:003 (it often appears at 002:002, but is variable!)
scanimage -L produces:
scanimage: no SANE devices found
so it definitely looks like a permission problem. If I change the permissions
on /proc/bus/... manually it works! there are devices at
both /proc/bus/usb/001/003 and /dev/bus/usb/1/3. Both have root/root
permissions.
I have added your line (slightly amended) to my udev rules:
# permissions for usb scanner
SUBSYSTEM=="usb", ACTION=="add", ENV{PRODUCT}=="04b8/011d/*",
RUN+="/bin/sh -c '/bin/chgrp scanner $env{DEVICE}; /bin/chmod 664
$env{DEVICE}'" (all on one line - its been word-wrapped by my e-mail
program!)
Even with this line, the permissions on /dev/bus/usb/1/3 remained root-root,
as did the corresponding lines in /proc/bus/...
I have a feeling that the problem may be $env{DEVICE}. This suggests to me
(and remember that I'm no programmer!) that there should be an environment
variable called DEVICE being set somewhere, but there doesn't appear to be.
If I manually change permissions on /dev/bus/usb/1/3, scanimage still doesn't
pick up my scanner. However, if I change permissions on /proc/bus/usb/001/003,
then it does.
In other words, it appears to be giving /proc/bus/... priority
over /dev/bus/...
According to messages elsewhere in this thread, it should use /dev/bus/ if its
available, and only use /proc/bus if there is no device on /dev/bus/
This doesn't seem to be happening!
Does this help at all?
BTW, I have now removed my line that created /dev/usbscanner.
--
Pete
chri...@attglobal.net
