uvc驱动记录

来源：互联网发布：邓布利多知乎编辑：程序博客网时间：2024/05/17 04:19

Linux uvc驱动分析

一、ioctl调用流程

1.common/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){  ret = uvc_video_init(stream);  vdev = video_device_alloc();  vdev->v4l2_dev = &dev->vdev;  vdev->fops = &uvc_fops;  vdev->release = uvc_release;  strlcpy(vdev->name, dev->name, sizeof vdev->name);  stream->vdev = vdev;  video_set_drvdata(vdev, stream);  ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);}

2.common/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){  return uvc_query_v4l2_ctrl(chain, arg);}

3.common/drivers/media/video/uvc/uvc_ctrl.c

int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,struct v4l2_queryctrl *v4l2_ctrl){  }

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