[linux-dvb] [Patch] Add links in sysfs to DVB adapter devices

Michael Krufky mkrufky at linuxtv.org
Thu Apr 6 22:15:04 CEST 2006

Andrew de Quincey wrote:
> Hi, this is a patch which adds sysfs links back to the root adapter for DVB 
> devices. Example:
> Currently in /sys/class/dvb/dvbX.demuxY/ we have:
> dev
> uevent
> With the patch, we have (for a PCI DVB device):
> dev
> device -> ../../../devices/pci0000:00/0000:00:1e.0/0000:03:0d.0
> uevent
> So userspace tools can (finally) work out which physical device a DVB adapter 
> refers to. Previously you had to kinda look through dmesg and hope that it 
> hadn't been dumped out of the buffer. This makes debugging a lot easier if 
> the system has been up for a long time!
> This is done by adding an extra 'struct device *' parameter to 
> dvb_register_adapter(). It will work with any kind of standard 
> linux 'device'. Additionally, if someone has an embedded system which does 
> things differently, they can simply supply 'NULL' and the behaviour will be 
> as before - the link will simply not appear.
> Since this affects the dvb-related files in the video4linux tree, I've sent it 
> to the video4linux list as well.
> Patch attached - please comment.

What else can I say?  I see no downside to this whatsoever.


Michael Krufky

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