Discussion on Linux UVC camera driver __linux

This paper is based on AM6C platform Linux3.0.8 kernel.

1.drivers/media/video/uvc/makefile

Uvcvideo-objs  : = uvc_driver.o uvc_queue.o uvc_v4l2.o uvc_video.o uvc_ctrl.o \
          uvc_status.o UVC_ISIGHT.O
obj-$ (Config_usb_video_class) + + UVCVIDEO.O

2.drivers/media/video/uvc/uvc_driver.c

Module_init (Uvc_init);
  static int __init uvc_init (void) {... result = Usb_register (&uvc_driver.driver);

......
}                                                                                                                 
        struct Uvc_driver uvc_driver = {. Driver = {. Name = "Uvcvideo",. Probe = Uvc_probe, . Discon Nect = Uvc_disconnect,. Suspend = Uvc_suspend,. Resume = Uvc_resume,. Reset_resume = Uvc_

Reset_resume,. id_table = Uvc_ids,. supports_autosuspend = 1,},};
  static int uvc_probe (struct usb_interface *intf,const struct usb_device_id) {... *id (dev);

......
}
  static int uvc_register_chains (struct uvc_device *dev) {... ret = uvc_register_terms (dev, chain);

......
} static int uvc_register_terms (struct uvc_device *dev,struct uvc_video_chain *chain) {... ret = Uvc_register_video (d
  EV, stream);

......
} static int Uvc_registEr_video (struct uvc_device *dev,struct uvc_streaming *stream) {... vdev = Video_device_alloc ();
  ... vdev->v4l2_dev = &dev->vdev;
  Vdev->fops = &uvc_fops;
  Vdev->release = Uvc_release;
  ... ret = Video_register_device (Vdev, Vfl_type_grabber,-1); ......
}

3.drivers/media/video/uvc/uvc_v4l2.c

const struct V4l2_file_operations uvc_fops = {. Owner = This_module,. Open = Uvc_v4l2_open,. Releas                                                                                                            
    E = Uvc_v4l2_release,. Unlocked_ioctl = Uvc_v4l2_ioctl, . Read = Uvc_v4l2_read,. mmap = Uvc_v4l2_mmap,. po

ll = Uvc_v4l2_poll, #ifndef config_mmu. Get_unmapped_area = Uvc_v4l2_get_unmapped_area, #endif}; Static long uvc_v4l2_ioctl (struct file *file,unsigned int cmd, unsigned long arg) {... return video_usercopy (file,
CMD, ARG, UVC_V4L2_DO_IOCTL); Static long uvc_v4l2_do_ioctl (struct file *file, unsigned int cmd, void *arg) {... switch (cmd) {case Vidio
    C_querycap: ... case vidioc_queryctrl:case vidioc_g_ctrl:case vidioc_s_ctrl:case vidioc_querymenu:  Case Vidioc_g_ext_ctrls:case Vidioc_s_ext_ctrls:case vidioc_try_ext_ctrls:case vidioc_enuminput:case Vidioc_g_input:case vidioc_s_input:case vidioc_enum_fmt:case vidioc_try_fmt:case vidioc_s_fmt:case VIDI Oc_g_fmt:case vidioc_enum_framesizes:case vidioc_enum_frameintervals:case vidioc_g_parm:case VIDIOC_S_ Parm:case vidioc_cropcap:case vidioc_g_crop:case vidioc_s_crop:case vidioc_reqbufs:case VIDIOC_QU Erybuf:case vidioc_qbuf:case vidioc_dqbuf:case vidioc_streamon:case vidioc_streamoff:case VIDIOC_ Enumstd:case vidioc_querystd:case vidioc_g_std:case vidioc_s_std:case vidioc_overlay:case VIDIOC _enumaudio:case vidioc_enumaudout:case vidioc_enumoutput:case __uvcioc_ctrl_add:case __UVCIOC_CTRL_MAP _old:case __uvcioc_ctrl_map:case uvcioc_ctrl_map:case __uvcioc_ctrl_get:case __UVCIOC_CTRL_SET:CA
  Se uvcioc_ctrl_query: ...} ......
}