hello,dear all
I having problem when using uvcvideo.ko ,Would any one help me in this.
I got error as :
videodev: has no release callback. Please fix your driver for proper sysfs
support
I am using linux 2.6.24 kernel . And download latest uvc driver .I am using
cross compiler gcc- 4.2.2-eabi
while I am compiling uvc driver using this compiler and kernel path I got
error in v4l2-dev.h file that
In file included from
/home/rajiv/6410/ExperimentUVC/UVC/uvcvideo-033b5968aa1a/v4l/../linux/include/media/v4l2-common.h:30,
from
/home/rajiv/6410/ExperimentUVC/UVC/uvcvideo-033b5968aa1a/v4l/uvc_driver.c:37:
/home/rajiv/6410/ExperimentUVC/UVC/uvcvideo-033b5968aa1a/v4l/../linux/include/media/v4l2-dev.h:
In function 'video_device_node_name':
/home/rajiv/6410/ExperimentUVC/UVC/uvcvideo-033b5968aa1a/v4l/../linux/include/media/v4l2-dev.h:159:
error: implicit declaration of function 'dev_name'
/home/rajiv/6410/ExperimentUVC/UVC/uvcvideo-033b5968aa1a/v4l/../linux/include/media/v4l2-dev.h:159:
warning: return makes pointer from integer without a cast
after getting this error I change function video_device_node_name as:
old function is
static inline const char *video_device_node_name(struct video_device *vdev)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
return vdev->dev.class_id;
#else
return dev_name(&vdev->dev);
#endif
}
I have changed this function as
static inline const char *video_device_node_name(struct video_device *vdev)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19)
return vdev->dev.class_id;
#else
return "/dev/video0";
#endif
}
after replacing this dev_name it is got compiled easily.
and when I loaded it and trying to execute test program for dev/video0 then
I got error as
Unable to handle kernel NULL pointer dereference at virtual address 00000004
pgd=c6a54000
[00000004] *pgd=56b57031, *pte=00000000,*ppte=00000000
internal error:Oops:17[#1]
Modules linked in : uvcvideo
.....so many lines and last line is
Sementation fault
If any one knows the solution for this problem Please guide me
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