[alsa-devel] alsactl adds volume controls?

[Raymond Yau]

2010/9/3 Jaroslav Kysela <perex at perex.cz>

> On Fri, 3 Sep 2010, David Henningsson wrote:
>
> > What would be really helpful would be if snd_mixer_open() took an
> > optional pcm handle, and then only returned the mixer controls that
> > affects the signal path of that pcm.
>
> This will be solved by another mechanism like ucm (use case manager). The
> idea is to return the PCM handle and associated mixer controls (master +
> pcm) for specified use case (like hdmi output etc.).
>
>                                        Jaroslav
>
>
How about those [Volume Knob Widget] , can the driver read back the step or
dB of the volume knob from the codec ?


Node 0x24 [Volume Knob Widget] wcaps 0x600000: Mono
  Volume-Knob: delta=1, steps=127, direct=0, val=127
  Connection: 4
     0x02 0x03 0x04 0x05