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_subdev_init(sd, &ops);//初始化v4l2_subdev//v4l2_i2c_subdev_init,对于i2c client设备,可以调用该函数media_entity_pads_init(&sd->entity, npads, pads);//假如子设备还作为media_entity, 有用media前后级联,还需调用media_entity_pads_initmedia_entity_pads_init(&sd->entity,1, isp_sdev->pad...
foo->v4l2_dev.ctrl_handler = &foo->ctrl_handler; 对于子设备驱动程序,请执行以下操作: structfoo_dev{...structv4l2_subdevsd;...structv4l2_ctrl_handlerctrl_handler;... }; foo->sd.ctrl_handler = &foo->ctrl_handler; 3.1.6.1.3 控件操作API 初始化和删除控件控制器 v4l2_ctrl_handler_init(&f...
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...
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...
使用v4l2_subdev_init初始化v4l2_subdev结构体。然后必须用一个唯一的名字初始化subdev->name,同时初始化模块的owner域。 若从设备是I2C设备,则可使用v4l2_i2c_subdev_init函数进行初始化,该函数内部会调用v4l2_subdev_init,同时设置flags、owner、dev、name等成员。
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, ...
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...
staticint __init vivi_create_instance(int inst) { struct vivi_dev *dev; struct video_device *vfd; 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 ...
static int __init videodev_init(void) { int ret; if (register_chrdev(VIDEO_MAJOR, VIDEO_NAME, &video_fops)) { return -EIO; } ret = class_register(&video_class); …… } 上面的代码注册了256个视频设备,并注册了video_class类。video_fops为这256个设备共同的操作方法。