Mike Isely <[EMAIL PROTECTED]> wrote: >[...] > As for why you need to be root, there isn't much the driver can do about > that. From the viewpoint of inside the kernel there really isn't a way > to change the owner of those sysfs files. The permissions can be > adjusted, but it's unwise for those fields to be world-writeable - since > then anything can take over control of the device. With device control, > usually one changes the gid of the files to match a specific group (e.g. > "video") and then users with permission to operate the device need only > be associated with that group. But even there the driver can't do > anything even if it wanted to, since the actual integer gid value for, > say, "video" is distro-specific. One clean, theoretical, way to fix > this is for there to be a udev rule that executes a chgrp on all of > /sys/class/pvrusb2/sn-xxxxxx at the point when the device appears. > That has the additional advantage that udev can know the correct > distro-specific gid value to use. But I haven't implemented this (this > is a task really outside of the driver). But it would be a useful > exercrise for someone else to set up.
I posted such a script a while back: http://www.isely.net/pipermail/pvrusb2/2008-April/001772.html There was a discussion then about how to find out if the attached video device was really a class/pvrusb2 device and not something else, but my script does no harm in such a case. It just does a bit of unnecessary work. What the script does is chgrp on all of /sys/class/pvrusb2/*/ and then adds group write permission for every file that has owner write permission. The right way to invoke this script seems to be distro-dependent, and this is the way to do it in Slackware 12.1: 1. Save the script as /lib/udev/rc.video and do chmod +x on it. 2. Edit the file /etc/udev/rules.d/40-video.rules and change the line: KERNEL=="video[0-9]*", NAME="v4l/video%n", SYMLINK+="%k", GROUP="video" into: KERNEL=="video[0-9]*", NAME="v4l/video%n", SYMLINK+="%k", GROUP="video", RUN+="rc.video" Both the file paths and the contents of the rules-file will most likely be different on other distros, and between different versions of the same distro. -- Bjorn Danielsson <[EMAIL PROTECTED]> _______________________________________________ pvrusb2 mailing list [email protected] http://www.isely.net/cgi-bin/mailman/listinfo/pvrusb2
