use compile uvc_video

use compile uvc_video

[Jerry Geis]

I am using centos 5.6 (older kernel) and I get compile errors when I 
grabbed
the latest from http://linuxtv.org/hg/v4l-dvb (which I expect as I have 
an older 2.6.18 kernel)

All I need is uvc so I thought I would do "make menuconfig" and turn 
everything off
but v4l/UVC stuff.

when I do make I get an error:
Kernel build directory is /lib/modules/2.6.18-194.32.1.el5/build
make -C /lib/modules/2.6.18-194.32.1.el5/build 
SUBDIRS=/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l  modules
make[2]: Entering directory `/usr/src/kernels/2.6.18-194.32.1.el5-x86_64'
  CC [M]  
/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/tuner-xc2028.o
In file included from 
/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/tuner-xc2028.c:19:
/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/compat.h:133: 
error: static declaration of 'strict_strtoul' follows non-static declaration
include/linux/kernel.h:141: error: previous declaration of 
'strict_strtoul' was here
make[3]: *** 
[/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/tuner-xc2028.o] 
Error 1
make[2]: *** 
[_module_/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l] Error 2
make[2]: Leaving directory `/usr/src/kernels/2.6.18-194.32.1.el5-x86_64'
make[1]: *** [default] Error 2
make[1]: Leaving directory 
`/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l'
make: *** [all] Error 2


Is there a way I can just compile the linux/drivers/media/video/uvc ?

thats all I need. How do I do that?

Thanks,

Jerry

Re: use compile uvc_video

[Jarod Wilson]

On May 26, 2011, at 9:11 AM, Jerry Geis wrote:

> I am using centos 5.6 (older kernel) and I get compile errors when I grabbed
> the latest from http://linuxtv.org/hg/v4l-dvb (which I expect as I have an older 2.6.18 kernel)

Okay, but do realize that it hasn't been updated in ages, and its
completely unmaintained.


> All I need is uvc so I thought I would do "make menuconfig" and turn everything off
> but v4l/UVC stuff.
> 
> when I do make I get an error:
> Kernel build directory is /lib/modules/2.6.18-194.32.1.el5/build

That's not a 5.6 kernel, its a 5.5 kernel. (5.6 is 2.6.18-238.x.y.el5).
Doesn't really make a difference, but felt compelled to point it out. :)


> make -C /lib/modules/2.6.18-194.32.1.el5/build SUBDIRS=/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l  modules
> make[2]: Entering directory `/usr/src/kernels/2.6.18-194.32.1.el5-x86_64'
> CC [M]  /home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/tuner-xc2028.o
> In file included from /home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/tuner-xc2028.c:19:
> /home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/compat.h:133: error: static declaration of 'strict_strtoul' follows non-static declaration
> include/linux/kernel.h:141: error: previous declaration of 'strict_strtoul' was here

The above lines tell you exactly what the failure was, and its easily
worked around by removing the extraneous definition from v4l/compat.h.


> Is there a way I can just compile the linux/drivers/media/video/uvc ?

Edit the .config file, disable anything you don't want to build.


> thats all I need. How do I do that?

Another option you can try is something along the lines of this:

cd linux/drivers/media/video/uvc
make -C /lib/modules/2.6.18-194.32.1.el5/build M=$PWD modules

No guarantees that won't fail miserably though.

Backporting newer drivers to older kernels often takes a fair bit of
effort and subject matter expertise -- especially when the kernel base
is as ancient as the one you're targeting. There's a reason media_build
doesn't support anything that old. :)

-- 
Jarod Wilson
jarod@wilsonet.com

Re: use compile uvc_video

[Jerry Geis]

Jarod,

Jarod Wilson wrote:
> On May 26, 2011, at 9:11 AM, Jerry Geis wrote:
>
>   
>> I am using centos 5.6 (older kernel) and I get compile errors when I grabbed
>> the latest from http://linuxtv.org/hg/v4l-dvb (which I expect as I have an older 2.6.18 kernel)
>>     
>
> Okay, but do realize that it hasn't been updated in ages, and its
> completely unmaintained.
>
>
>   
>> All I need is uvc so I thought I would do "make menuconfig" and turn everything off
>> but v4l/UVC stuff.
>>
>> when I do make I get an error:
>> Kernel build directory is /lib/modules/2.6.18-194.32.1.el5/build
>>     
>
> That's not a 5.6 kernel, its a 5.5 kernel. (5.6 is 2.6.18-238.x.y.el5).
> Doesn't really make a difference, but felt compelled to point it out. :)
>
>
>   
>> make -C /lib/modules/2.6.18-194.32.1.el5/build SUBDIRS=/home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l  modules
>> make[2]: Entering directory `/usr/src/kernels/2.6.18-194.32.1.el5-x86_64'
>> CC [M]  /home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/tuner-xc2028.o
>> In file included from /home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/tuner-xc2028.c:19:
>> /home/silentm/MessageNet/v4l/new/v4l-dvb-3724e93f7af5/v4l/compat.h:133: error: static declaration of 'strict_strtoul' follows non-static declaration
>> include/linux/kernel.h:141: error: previous declaration of 'strict_strtoul' was here
>>     
>
> The above lines tell you exactly what the failure was, and its easily
> worked around by removing the extraneous definition from v4l/compat.h.
>
>
>   
>> Is there a way I can just compile the linux/drivers/media/video/uvc ?
>>     
>
> Edit the .config file, disable anything you don't want to build.
>
>
>   
>> thats all I need. How do I do that?
>>     
>
> Another option you can try is something along the lines of this:
>
> cd linux/drivers/media/video/uvc
> make -C /lib/modules/2.6.18-194.32.1.el5/build M=$PWD modules
>
> No guarantees that won't fail miserably though.
>
> Backporting newer drivers to older kernels often takes a fair bit of
> effort and subject matter expertise -- especially when the kernel base
> is as ancient as the one you're targeting. There's a reason media_build
> doesn't support anything that old. :)
>
>   
I am trying your suggestion. with the "make -C" when I do this I get 
errors about
include files not found. I was trying to specify "-I path/v4l -I 
path/linux/include" on the make line
but it still does not find the compat.h and linux/usb.video.h

Your correct, my machines 5.6 and I was compiling on 5.5 machine.

How do I correctly specify the include paths?

Thanks

Jerry

Re: use compile uvc_video

[Jarod Wilson]

On May 26, 2011, at 10:25 AM, Jerry Geis wrote:
...
>>> Is there a way I can just compile the linux/drivers/media/video/uvc ?
>>>    
>> 
>> Edit the .config file, disable anything you don't want to build.
>> 
>>  
>>> thats all I need. How do I do that?
>>>    
>> 
>> Another option you can try is something along the lines of this:
>> 
>> cd linux/drivers/media/video/uvc
>> make -C /lib/modules/2.6.18-194.32.1.el5/build M=$PWD modules
>> 
>> No guarantees that won't fail miserably though.
>> 
>> Backporting newer drivers to older kernels often takes a fair bit of
>> effort and subject matter expertise -- especially when the kernel base
>> is as ancient as the one you're targeting. There's a reason media_build
>> doesn't support anything that old. :)
>> 
>>  
> I am trying your suggestion. with the "make -C" when I do this I get errors about
> include files not found. I was trying to specify "-I path/v4l -I path/linux/include" on the make line
> but it still does not find the compat.h and linux/usb.video.h

Those probably need to be made relative to linux/drivers/media/video/uvc/.


> Your correct, my machines 5.6 and I was compiling on 5.5 machine.

Yeah, I'm quite familiar with the EL5 kernel. Just take a look at the
kernel rpm changelog entries. :)


-- 
Jarod Wilson
jarod@wilsonet.com