int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc); /* 查询设备支持的操作 */
int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); /* 获取当前命令值 */
int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl); /* 设置当前命令值 */
int (*g_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); /* 获取外置命令值 */
int (*s_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls); /* 设置外置命令值 */
int (*try_ext_ctrls)(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls);
int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm); /* 查询操作菜单 */
int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm); /* 设置数据标准 */
long (*ioctl)(struct v4l2_subdev *sd, unsigned int cmd, void *arg); /* 处理特殊命令 */
#ifdef CONFIG_VIDEO_ADV_DEBUG
int (*g_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); /* 获取寄存器值 */
int (*s_register)(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg); /* 设置寄存器值 */
#endif
};
v4l2_subdev_tuner_ops 包含的操作合集则是调谐器独有的：
[cpp]
struct v4l2_subdev_tuner_ops {
int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type); /* 设置调谐器模式 */
int (*s_radio)(struct v4l2_subdev *sd); /* 设置无线设备信息 */
int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); /* 设置频率 */
int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq); /* 获取频率 */
int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt); /* 获取调谐器信息 */
int (*g_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm); /* 获取调幅器信息 */
int (*s_modulator)(struct v4l2_subdev *sd, struct v4l2_modulator *vm); /* 设置调幅器信息 */
int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type); /* 安装调谐器 */
int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config); /* 设置配置信息 */
int (*s_standby)(struct v4l2_subdev *sd); /* 设置标准 */
};
v4l2_subdev_audio_ops 包含的操作合集则是音频部分独有的：
[cpp] view plaincopy
struct v4l2_subdev_audio_ops {
int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq); /* 设置音频设备频率 */
int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq); /* 设置i2s总线频率 */
int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config); /* 设置音频路由 */
};
v4l2_subdev_video_ops 包含的操作合集则是视频部分独有的：
[cpp]
struct v4l2_subdev_video_ops {
int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config); /* 设置视频路由 */
int (*s_crystal_freq)(struct v4l2_subdev *sd, u32 freq, u32 flags); /* 设置设备频率 */
int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line); /* 消隐区信息解码 */
int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data); /* 设置消隐区数据 */
int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data); /* 获取消隐区数据 */
int (*g_sliced_vbi_cap)(stru