一、写一个USB摄像头驱动程序

uvc_driver.c分析

uvc_driver.c分析uvc_probeuvc_register_videovideo_device_allocvdev->parent = &dev->intf->dev;vdev->minor = -1;vdev->fops = &uvc_fops;vdev->release = video_device_release;video_register_device(vdev, VFL_TYPE_GRABBER, -1)重要的结构体:const struct v4l2_file_operations uvc_fops = {.owner		= THIS_MODULE,.open		= uvc_v4l2_open,.release	= uvc_v4l2_release,.ioctl		= uvc_v4l2_ioctl,.read		= uvc_v4l2_read,.mmap		= uvc_v4l2_mmap,.poll		= uvc_v4l2_poll,};

  usb摄像头的主要框图:

1. 从上图可知usb摄像头主要由VideoControl Interface、VideoStreaming Interface两大部分组成VC的主要作用是控制设备，VS的主要作用是用于传输.
2. VC内部主要由两部分组成unit和terminal，CT指的是camera terminal、IT指input terminal、su指select unit 、pu指process unit
3. PU主要作用如下:
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