v4l2_ctrl_new_std_menu(&foo->ctrl_handler,&foo_ctrl_ops,V4L2_CID_POWER_LINE_FREQUENCY,V4L2_CID_POWER_LINE_FREQUENCY_60HZ,0,V4L2_CID_POWER_LINE_FREQUENCY_DISABLED); ...if(foo->ctrl_handler.error){int err=foo->ctrl_handler.error; v4l2_ctrl_handler_free(&foo->ctrl_handler);returnerr;}...
unsignedintnotification,void*arg);structv4l2_ctrl_handler*ctrl_handler;structv4l2_prio_stateprio;structkrefref;void(*release)(structv4l2_device *v4l2_dev);
struct v4l2_ctrl_handler {// 互斥锁,用于控制对该处理程序及其控件的访问struct mutex _lock;// 指向互斥锁的指针struct mutex *lock;// 控件列表struct list_head ctrls;// 控件引用列表struct list_head ctrl_refs;// 上次找到的控件引用,因为同一个控件可能需要多次使用,所以这是一个简单的优化struct v4l2...
v4l2_ctrl_new_std(&ctrl_handler, &ctrl_ops, V4L2_CID_CONTRAST, 0, 255, 1, 128); // 添加对比度控件 // 可以根据需要添加更多的控制器控件 ``` 通过以上步骤,我们成功地实现了 v4l2_ctrl_handler_init 函数的初始化和添加控制器控件的过程。这样便可以在视频设备的驱动程序中使用这些控制器控件,方便...
(struct v4l2_subdev*sd,unsigned int notification,void*arg);/* The control handler. May be NULL. */struct v4l2_ctrl_handler*ctrl_handler;/* Device's priority state */struct v4l2_prio_state prio;/* BKL replacement mutex. Temporary solution only. */struct mutex ioctl_lock;/* Keep track of...
v4l2_ctrl_new_std(hdl, &skel_ctrl_ops, V4L2_CID_HUE, -128, 127, 1, 0); if (hdl->error) { ret = hdl->error; goto free_hdl; } skel->v4l2_dev.ctrl_handler = hdl; 10、设置vb2相关参数并初始化vb2队列 q = &skel->queue; ...
V4L2_MEMORY_USERPTR 例程,1.平台:rk3399firefly 2g+16g2. 内核:linux5.15.136(从内核镜像网站下载)3. 交叉编译工具 gccversion7.5.0(Ubuntu/Linaro7.5.0-3ubuntu1~18.04)4.宿主机:ubuntu18.045.需要的素材和资料:链接:https://pan.baidu.co
(hdl,&vivi_ctrl_menu,NULL);dev->string=v4l2_ctrl_new_custom(hdl,&vivi_ctrl_string,NULL);dev->bitmask=v4l2_ctrl_new_custom(hdl,&vivi_ctrl_bitmask,NULL);if(hdl->error){ret=hdl->error;goto unreg_dev;}v4l2_ctrl_auto_cluster(2,&dev->autogain,0,true);dev->v4l2_dev.ctrl_handler=hdl...
kernel/nvidia/drivers/media/platform/tegra/camera/vi/channel.c @@ -2290,6 +2290,16 @@int tegra_channel_init_video(struct tegra_channel *chan) chan->video->ctrl_handler = &chan->ctrl_handler; chan->video->lock = &chan->video_lock;+ /* Validate that the name fits */+ if (ARRAY_...
struct v4l2_ctrl_handler *hdl; struct vb2_queue *q; // 分配一个 vivi_dev 结构体 dev = kzalloc(sizeof(*dev), GFP_KERNEL); // v4l2_dev 初始化,并没有什么作用 ret = v4l2_device_register(NULL, &dev->v4l2_dev); // 设置 dev 的一些参数,比如图像格式、大小 ...