Re: work-around for video4linux sysfs

[Kees Cook <kees@outflux.net>]

Hi Kay,

On Wed, Aug 08, 2007 at 12:58:43AM +0200, Kay Sievers wrote:
> Look at drivers/media/video/videodev.c how the "name" attribute is
> created. There should probably be common "function" names added to
> the v4l core which are just referenced by the drivers, like the
> defines for the device type in include/media/v4l2-dev.h which are
> replaced by strings in drivers/media/video/videodev.c.

Okay, thanks.  I'll try to find some time to investigate this.

> Yeah, I see the problem, and it's time to solve it. Maybe you can try to
> add the stuff to the drivers you have access to the hardware, and we can
> come up with a working prototype, propose that to the v4l maintainer(s)
> and convert the other drivers step by step. Persistent names would just
> rely on that feature to be added to the driver for devices with multiple
> nodes of the same type.

Sure, that sounds right.

> Btw, what does:
>   grep . /sys/class/video4linux/*/*
> print on your box? If you have access to the device with the multiple
> nodes.

$ grep . /sys/class/video4linux/*/* 2>/dev/null
/sys/class/video4linux/radio0/dev:81:64
/sys/class/video4linux/radio0/name:cx88[0] radio (pcHDTV HD3000 HD
/sys/class/video4linux/vbi0/dev:81:224
/sys/class/video4linux/vbi0/name:cx88[0] vbi (pcHDTV HD3000 HDTV
/sys/class/video4linux/vbi1/dev:81:225
/sys/class/video4linux/vbi1/name:ivtv0 encoder VBI
/sys/class/video4linux/video0/dev:81:0
/sys/class/video4linux/video0/name:cx88[0] video (pcHDTV HD3000 HD
/sys/class/video4linux/video1/dev:81:1
/sys/class/video4linux/video1/name:ivtv0 encoder MPEG
/sys/class/video4linux/video24/dev:81:24
/sys/class/video4linux/video24/name:ivtv0 encoder PCM audio
/sys/class/video4linux/video32/dev:81:32
/sys/class/video4linux/video32/name:ivtv0 encoder YUV

How's that for a mess?  ;)

Thanks again,

-Kees

-- 
Kees Cook                                            @outflux.net

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