omap35x camera isp driver

I am working to get the omap34xxcam driver work without any decoder chip. 'Cause I want to capture video directly throuhg the camera isp. Currently I
was not successful in forcing the driver to load and register .
It fails after calling the

vidioc_int_g_priv()

Function in the device-register function of the "omap34xxcam.c".

if (vidioc_int_g_priv(s, &hwc))
  return -ENODEV;

 if (vdev->index != hwc.dev_index)             //here the index is not equal.
  return -ENODEV;

 if (hwc.dev_type < 0 || hwc.dev_type > OMAP34XXCAM_SLAVE_FLASH)
  return -EINVAL;

What's wrong with the driver?

Is there any documentation to find?

Any hint would be perfect.