v4l2_i2c_subdev_addr
tun_setup.addr = v4l2_i2c_subdev_addr(sd);
tuner_addr = v4l2_i2c_subdev_addr(sd);
EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr);
unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd);