I2C_GET_PORT
err = ioctl(fd, I2C_GET_PORT, &port);
c = ioctl(fd_bkplane, I2C_GET_PORT, &port);
ret = ioctl_retry(fp, I2C_GET_PORT, (void *)&port);
ret = ioctl_retry(fp, I2C_GET_PORT, (void *)&port);
ret = ioctl_retry(fp, I2C_GET_PORT, (void *)&port);
case I2C_GET_PORT:
case I2C_GET_PORT:
case I2C_GET_PORT:
case I2C_GET_PORT: