About Webcam module

[shariefbe]

Hi friends,
I have some doubts in video device driver. I have an Creative webcam with me. After inserting the webcam i have seen the following modules installed

Module              Size       Used by
gspca_zc3xx      55936      0 
gspca_main       29312      1   gspca_zc3xx
videodev            41344      1   gspca_main
v4l1_compat      22404      1   videodev

I dont know which module is exactly for my webcam? i am seeing 5 extra module installed after inserting my webcam. I am confused. Can anyone help me?

[GNU-Fan]

The first module is the driver code specific for the hardware.
The rest are more general routines that the driver depends on.

[shariefbe]

so you mean this "gspca_zc3xx" is hardware driver?

[GNU-Fan]

It contains the parts that are specific to this hardware model.
Together with the other, more generic, modules it forms the device driver.

[shariefbe]

ok finally you mean this is the module for my device....right?

[shariefbe]

Here i am facing a new problem. I tried to compile and install the gspca_main and gspca_zc3xx modules separately. I compiled them successfully. but i am getting error when inserting that modules

root@sharief-desktop:/home/sharief/Desktop/video/gspca# insmod gspca_zc3xx.ko 
insmod: error inserting 'gspca_zc3xx.ko': -1 Unknown symbol in module
root@sharief-desktop:/home/sharief/Desktop/video/gspca# insmod gspca_main.ko 
insmod: error inserting 'gspca_main.ko': -1 Unknown symbol in module

I think this both modules what some other modules to get insert in to kernel...But i am sure about that modules. Can anyone help me?

[shariefbe]

I cam to know that i need the other two modules to be installed to work this module..ie "videodev" and "v4l1-compat"...so i copiled that modules too...but i am getting the following error..
I compiled all the required modules...ie gspca_main, gspca_zc3xx, v4l1-compat. But i am not getting this "videodev" module..I dont know why...

My Makefile

obj-m += gspca_main.o
obj-m += gspca_zc3xx.o
obj-m += v4l1-compat.o
obj-m += v4l2-dev.o
obj-m += v4l2-ioctl.o
obj-m += v4l2-device.o
 
gspca_main-objs := gspca.o
gspca_zc3xx-objs := zc3xx.o
videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o

all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules

clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean

if i compile i am getting the the modules as

sharief@sharief-desktop:~/Desktop/video/gspca$ make
make -C /lib/modules/2.6.30/build M=/home/sharief/Desktop/video/gspca modules
make[1]: Entering directory `/home/sharief/Desktop/kernelroot/linux-2.6.30'
CC [M] /home/sharief/Desktop/video/gspca/gspca.o
CC [M] /home/sharief/Desktop/video/gspca/zc3xx.o
LD [M] /home/sharief/Desktop/video/gspca/gspca_main.o
LD [M] /home/sharief/Desktop/video/gspca/gspca_zc3xx.o
CC [M] /home/sharief/Desktop/video/gspca/v4l1-compat.o
CC [M] /home/sharief/Desktop/video/gspca/v4l2-dev.o
CC [M] /home/sharief/Desktop/video/gspca/v4l2-ioctl.o
CC [M] /home/sharief/Desktop/video/gspca/v4l2-device.o
Building modules, stage 2.
MODPOST 6 modules
CC /home/sharief/Desktop/video/gspca/gspca_main.mod.o
LD [M] /home/sharief/Desktop/video/gspca/gspca_main.ko
CC /home/sharief/Desktop/video/gspca/gspca_zc3xx.mod.o
LD [M] /home/sharief/Desktop/video/gspca/gspca_zc3xx.ko
CC /home/sharief/Desktop/video/gspca/v4l1-compat.mod.o
LD [M] /home/sharief/Desktop/video/gspca/v4l1-compat.ko
CC /home/sharief/Desktop/video/gspca/v4l2-dev.mod.o
LD [M] /home/sharief/Desktop/video/gspca/v4l2-dev.ko
CC /home/sharief/Desktop/video/gspca/v4l2-device.mod.o
LD [M] /home/sharief/Desktop/video/gspca/v4l2-device.ko
CC /home/sharief/Desktop/video/gspca/v4l2-ioctl.mod.o
LD [M] /home/sharief/Desktop/video/gspca/v4l2-ioctl.ko

  I dont know why i am getting like this...?Please help me

I am not getting the exact videodev module....please help me

[waterhead]

That driver is part of the kernel. You shouldn't need to compile it. Here is the info on it that I get from the kernel.

  │ CONFIG_VIDEO_DEV:                                                                    │  
  │                                                                                      │  
  │ V4L core support for video capture and overlay devices, webcams and                  │  
  │ AM/FM radio cards.                                                                   │  
  │                                                                                      │  
  │ This kernel includes support for the new Video for Linux Two API,                    │  
  │ (V4L2).                                                                              │  
  │                                                                                      │  
  │ Additional info and docs are available on the web at                                 │  
  │ <http://linuxtv.org>                                                                 │  
  │                                                                                      │  
  │ Documentation for V4L2 is also available on the web at                               │  
  │ <http://bytesex.org/v4l/>.                                                           │  
  │                                                                                      │  
  │ To compile this driver as a module, choose M here: the                               │  
  │ module will be called videodev.                                                      │  
  │                                                                                      │  
  │ Symbol: VIDEO_DEV [=m]                                                               │  
  │ Prompt: Video For Linux                                                              │  
  │   Defined at drivers/media/Kconfig:14                                                │  
  │   Depends on: HAS_IOMEM                                                              │  
  │   Location:                                                                          │  
  │     -> Device Drivers                                                                │  
  │       -> Multimedia devices                                                          │  
  │                                                                                      │

[shariefbe]

Thanks for your information. yes i know it. But i am trying it for experiment. I want to compile it separately. That why i tried to compiled it....I am not gettig that videodev module....

[waterhead]

It looks like it is part of the v4l-dvb drivers:

v4l-dvb: 75184c1912a1 /linux/include/linux/

I don't know if it cam be compiled separately, as there is no Makefile for that branch. You may have to compile the entire driver package.

v4l-dvb: 75184c1912a1 /