struct v4l2_ctrl_type_ops — The control type operations that the driver has to provide.
struct v4l2_ctrl_type_ops {
bool (* equal) (const struct v4l2_ctrl *ctrl, u32 idx,union v4l2_ctrl_ptr ptr1,union v4l2_ctrl_ptr ptr2);
void (* init) (const struct v4l2_ctrl *ctrl, u32 idx,union v4l2_ctrl_ptr ptr);
void (* log) (const struct v4l2_ctrl *ctrl);
int (* validate) (const struct v4l2_ctrl *ctrl, u32 idx,union v4l2_ctrl_ptr ptr);
};