I'm working on a userspace driver for the Meade DSI Pro camera. It uses
the EZ-USB FX2 chip which requires a firmware upload. I've successfully
extracted the firmware into an Intel hex format file and now have a udev
rule to load the firmware after which the device renumerates. Here's
the udev rule I have:
# 1. Pre-renumeration IDs
# Meade DSI Pro II
BUS=="usb", ACTION=="add", SYSFS{idVendor}=="156c",
SYSFS{idProduct}=="0100", ENV{DEVICE}!="", \
RUN+="/sbin/fxload -t fx2 -D $ENV{DEVICE} -I
/lib/firmware/meade-dsiproII.hex"
# 2. Post-renumeration IDs
# Meade DSI Pro II
BUS=="usb", ACTION=="add", SYSFS{idVendor}=="156c",
SYSFS{idProduct}=="0101", ENV{DEVICE}!="", \
SYMLINK+="dsiproII.%n" MODE="0666"
The symlink is good, it points to /dev/bus/usb/<bus>/<device>, and all
it well. I can find and access the device using libusb to iterate over
all devices. But the device node in /dev/bus/usb does not have the
correct permissions; it has 0644 owner root. This doesn't quite cut it
for me.
But...
If I change the second rule to
BUS=="usb", ACTION=="add", SYSFS{idVendor}=="156c",
SYSFS{idProduct}=="0101", ENV{DEVICE}!="", \
NAME="dsiproII" SYMLINK+="dsiproII.%n" MODE="0666"
then I get the node /dev/dsiproII with the correct permissions, but the
device node in /dev/bus/usb/<bus>/<dev> is gone and libusb can no longer
find the device.
I've asked about this over on the linux-usb list and they suggested I
ask here. So I am :-)
What I *really* want is to us the pam console rules to change the owner
like what happens when I plug in a webcam with the v4l stuff; I can get
that to work if I use the NAME= directive (although I have an issue with
SELinux I'm still working on there), but I really need the libusb part
working.
So...
1. Can I get my "preferred" name and still have libusb find the device?
2. If not, can I get the permission change applied to the underlying
device node?
3. If yes, do I have to use the RUN directive with a helper to get this
to work?
TIA,
roland
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Roland B. Roberts, PhD RL Enterprises
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roland@xxxxxxxxxxxxx Brooklyn, NY 11220
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