Re: [alsa-devel] ASoC: How to declare volume TLV dB scale?

Sergej Sawazki wrote:

could someone please help me to understand the mixer controls TLV scale? What would be the DECLARE_TLV_DB_SCALE values for the following example?

reg. value: 0 .. 0x3ff phys. value: 0dB .. -128dB volume: 100% .. 0%(mute)

0% volume would be -∞ dB.

And how are the register values mapped between the min/max values? Does 0x200 correspond to -64 dB, or 50 % of the sample value, or 50 % of the volume?

What does TLV actually stand for?

Type-length-value. It's an implementation detail.

Regards, Clemens