Looking for inputs on hostless playback with the DSP

Hi Mark/Takashi,

I would like to implement a topology with a tone generator widget running in the DSP that is connected to the speaker codec at the backend. So, my pipeline looks something like this:

Tone Generator Module (DSP) -> DAI Component (DSP) -> Speaker Codec

Without a PCM frontend, how would I go about activating this path in my topology? While I can think of adding a kcontrol for the tone generator widget to enable the pipeline in the DSP, I'm wondering how to do the hw_params, startup/shutdown for the backend speaker codec. Could you please help me with some pointers on how to do this?

Thanks, Ranjani