TBS CI interface type

Hello, I am wondering if CI support in Linux drivers for TBS 6618 implemented as low-level CI API or high-level CI API? For example, program zap uses high level CI API.
P.S. Also, what's the status of merging DVB TBS drivers into mainline Linux kernel?
P.S. Also, what's the status of merging DVB TBS drivers into mainline Linux kernel?