[patch] add video_nr module param to gspca

[patch] add video_nr module param to gspca

[Stas Sergeev]

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Hi.

The attached patch adds the
module_param for video_nr to
the gspca driver.
The patch is completely untested
as I don't use any webcam myself.
Its just that a friend of mine
complained about an inability to
set the device number for gspca
and I hope this patch can solve
that problem.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>

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--- a/drivers/media/video/gspca/gspca.c	2008-12-06 23:39:56.000000000 +0300
+++ b/drivers/media/video/gspca/gspca.c	2009-01-10 19:29:49.000000000 +0300
@@ -48,6 +48,8 @@
 #define DRIVER_VERSION_NUMBER	KERNEL_VERSION(2, 3, 0)
 
 static int video_nr = -1;
+module_param(video_nr, int, 0);
+MODULE_PARM_DESC(video_nr, "video device to register (0=/dev/video0, etc)");
 
 #ifdef GSPCA_DEBUG
 int gspca_debug = D_ERR | D_PROBE;

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Re: [patch] add video_nr module param to gspca

[Jean-Francois Moine]

On Sat, 10 Jan 2009 21:53:14 +0300
Stas Sergeev <stsp@aknet.ru> wrote:

> Hi.
> 
> The attached patch adds the
> module_param for video_nr to
> the gspca driver.
> The patch is completely untested
> as I don't use any webcam myself.
> Its just that a friend of mine
> complained about an inability to
> set the device number for gspca
> and I hope this patch can solve
> that problem.

Hi,

I don't think such a patch is usefull.

Instead, as every system runs udev, it is simpler to add a rule as:

  ATTRS{idVendor}=="05e1",ATTRS{idProduct}=="0893",NAME="video3"

Best regards.

-- 
Ken ar c'hentan	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/

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Re: [patch] add video_nr module param to gspca

[Stas Sergeev]

Hello.

Jean-Francois Moine wrote:
> I don't think such a patch is usefull.
> Instead, as every system runs udev, it is simpler to add a rule as:
>   ATTRS{idVendor}=="05e1",ATTRS{idProduct}=="0893",NAME="video3"
Other drivers do have that modparam,
namely, I copy/pasted from cpia2_v4l.c.
So I thought it would be a good idea
to have it at least for consistency,
but thanks for the udev hint!

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Re: [patch] add video_nr module param to gspca

[Stas Sergeev]

Hi.

Jean-Francois Moine wrote:
> Looking at the video drivers, I found that only half of these ones have
> this parameter. Then, I think it should be better to remove it
> everywhere!
OK, that might be a solution too. :)

> In fact, setting the video number in the right driver before plugging
> any video device is rather complicated while setting udev rules is easy
> and has to be done only once...
No, its not like that. You only add the
strings like
options gspca video_nr=1
in your /etc/modprobe.conf, and you are
done. ALSA went even further and introduced
the option "order", so that you write:
options snd order=snd-intel8x0,snd-hda-intel
for example. So, from some point of view, this
is actually easier than the udev solution
(eg. I always did that and never played with
udev :), but indeed, having two ways of doing
the same thing is usually confusing, so I am
not trying to talk you into applying my patch. :)
If there is an intention to deprecate the "video_nr"
thing, then it certainly doesn't apply.

Re: [patch] add video_nr module param to gspca

[Mauro Carvalho Chehab]

Hi Stas,

Please, always copy linux-media@vger.kernel.org for patches and other subjects
related to drivers development. This will allow patchwork.kernel.org to
properly track the sent patches.

Cheers,
Mauro.

On Sat, 10 Jan 2009 21:53:14 +0300
Stas Sergeev <stsp@aknet.ru> wrote:

> Hi.
> 
> The attached patch adds the
> module_param for video_nr to
> the gspca driver.
> The patch is completely untested
> as I don't use any webcam myself.
> Its just that a friend of mine
> complained about an inability to
> set the device number for gspca
> and I hope this patch can solve
> that problem.
> 
> Signed-off-by: Stas Sergeev <stsp@aknet.ru>




Cheers,
Mauro