Linux uvc摄像头驱动初探

本文主要是介绍Linux uvc摄像头驱动初探，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

本文基于AM6C平台Linux3.0.8内核。

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,                                                                                                                 .disconnect = 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){......uvc_register_chains(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(dev, 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,.release    = uvc_v4l2_release,.unlocked_ioctl = uvc_v4l2_ioctl,                                                                                                            .read       = uvc_v4l2_read,.mmap       = uvc_v4l2_mmap,.poll       = 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 VIDIOC_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 VIDIOC_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_QUERYBUF: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:case UVCIOC_CTRL_QUERY:......   }......
}

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