From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kay Sievers Date: Tue, 11 Jul 2006 12:06:07 +0000 Subject: Re: Video devices Message-Id: <1152619567.4131.9.camel@pim.off.vrfy.org> List-Id: References: <44B2FA34.8090405@openstreet.com> In-Reply-To: <44B2FA34.8090405@openstreet.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org On Mon, 2006-07-10 at 22:08 -0400, Paul Check wrote: > Kay Sievers wrote: > > >On Mon, 2006-07-10 at 21:09 -0400, Paul Check wrote: > > > > > >>Hi: I have a webcam and a pvr350 capture card (modules pwc and ivtv > >>resp) attached to my machine, running 2.6.16 kernel and udev. The > >>classic problem is that these modules get assigned to /dev/video0 and > >>/dev/video1 in seemingly arbitrary ways. I've tried forcing module > >>loading at boot time but still can't seem to get one to load first > >>consistently. > >> > >>So, I turned to writing udev rules and followed the "writing udev rules" > >>document. My goal would be to have udev just symlink > >> > >>/dev/webcam0 to /dev/videoM > >> > >>and > >> > >>/dev/pvr0 to /dev/videoN, > >> > >>where M and N are 0 and 1, assignmed however the system so chooses. > >> > >>I've tried writing udev rules to symlink, but they didn't work. Upon > >>further investigation I don't actually see any rules to create the video > >>devices in the /etc/udev/rules.d/ directory. And yet, they are created. > >>Also, I see they are mentioned in /etc/udev/devfs.rules, but there is no > >>symlink to this file in the rules.d/ directory. > >> > >>So, how do the video devices get created here? Is there some devfs > >>left-over? Perhaps if I knew where the /dev/video?'s are being created > >>I'd be able to figure out how to symlink to them?! I'm running debian > >>unstable, fully updated. > >> > >> > > > >Udev does not need any rule to work, it just uses as the default the > >kernel device name and creates the node owned by root. > Let me show what I did: > > I created /etc/udev/local-late.rules containing: > > KERNEL="ivtv", SYMLINK+="pvr0", GROUP="video" > KERNEL="pwc", SYMLINK+="webcam0", GROUP="video" > > then created a symlink in /etc/udev/rules.d to that file: > > z10_local-late.rules -> ../local-late.rules > > and yet the /dev/webcam0 and /dev/pvr0 are not created. Is "ivtv" and "pwc" really a kernel name (existing node)? Don't you need to link to "video0" and "video1"? You may want to try: udevinfo -a -p /class/video4linux/video0 select properties which identify the device and create a rule like: KERNEL="video*", SYSFS{idProduct}="a511", SYSFS{idVendor}="05a9", SYMLINK+="webcam0" Kay ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642 _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel