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...
v4l2_ctrl_handler_init(hdl, 11);//初始化一个ctrl_handler /*v4l2_ctrl_new_std 添加一个新的标准的ctrl v4l2_ctrl_new_custom添加一个客户自定义的ctrl*/ dev->volume = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,V4L2_CID_AUDIO_VOLUME, 0, 255, 1, 200); dev->brightness = v4l2_ctrl_new_std...
答:在驱动程序中抽象出来一个结构体v4l2_ctrl, 每个Ctrl对应其中的一项(音量、亮度等等); 由v4l2_ctrl_handler来管理他们 1.初始化 v4l2_ctrl_handler_init 2.设置 v4l2_ctrl_new_std v4l2_ctrl_new_custom 这些函数就是创建各个属性,并且放入v4l2_ctrl_handler的链表 3.跟vdev关联 dev->v4l2_dev.ctrl_handle...
hdl = &skel->ctrl_handler; v4l2_ctrl_handler_init(hdl, 4); v4l2_ctrl_new_std(hdl, &skel_ctrl_ops, V4L2_CID_BRIGHTNESS, 0, 255, 1, 127); v4l2_ctrl_new_std(hdl, &skel_ctrl_ops, V4L2_CID_CONTRAST, 0, 255, 1, 16); v4l2_ctrl_new_std(hdl, &skel_ctrl_ops, V4L2_CID_SATURATI...
3. 设置"ctrl属性"(用于APP的ioctl): v4l2_ctrl_handler_init(hdl, 11); dev->volume = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 255, 1, 200); dev->brightness = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops, ...
struct v4l2_subdev_core_ops { int (*log_status)(struct v4l2_subdev *sd); int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n, struct v4l2_subdev_io_pin_config *pincfg); int (*init)(struct v4l2_subdev *sd, u32 val); int (*load_fw)(struct v4l2_subdev *sd); int (*re...
…nit() The ov2680 driver has 9 controls now and the call to v4l2_ctrl_new_fwnode_properties() adds 2 more. Tell v4l2_ctrl_handler_init() to pre-allocate space for 11 controls to match this. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sakari Ailus <sakari....
staticint __initvivi_create_instance(int inst){struct vivi_dev*dev;struct video_device*vfd;struct v4l2_ctrl_handler*hdl;struct vb2_queue*q;int ret;dev=kzalloc(sizeof(*dev),GFP_KERNEL);if(!dev)return-ENOMEM;snprintf(dev->v4l2_dev.name,sizeof(dev->v4l2_dev.name),"%s-%03d",VIVI_MODULE...
1. 进⼊⼊⼝的vivi_init(void)函数：1static int __init vivi_create_instance(int inst)2 { 3struct vivi_dev *dev;4struct video_device *vfd; //video_device结构体定义 5struct v4l2_ctrl_handler *hdl;6struct vb2_queue *q;7int ret;8 9 dev = kzalloc(sizeof(*dev), GFP_KERNEL...
v4l2_ctrl_handler 是用于保存子设备控制方法集的结构体,对于视频设备这些 ctrls 包括设置亮度、饱和度、对比度和清晰度等,用链表的方式来保存 ctrls,可以通过 v4l2_ctrl_new_std 函数向链表添加 ctrls。在下面的代码中用到了这个函数。/* Initialize the handler */ int v4l2_ctrl_handler_init(struct v4l2_...