For other forum users, I've gotten this response via e-mail:
hi Jaap,
the update for Linux kernel 3.16.x and even 3.17.x is already ready and it will be released in the next days, because we want to include some more changed in it.
Dear tbs support. After upgrading my Ubuntu 14.04 server to kernel 3.16.1 I can no longer compile the TBS6618 driver. It seems that a function call to the ‘snd_card_new’ function is no longer valid due to changed arguments. I hope you’ll be able to resolve this problem in short notice. Kernel detail...