cvs commit: src/sys/dev/sound/pci es137x.c

[Ariff Abdullah]

ariff       2005-11-14 18:17:31 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/sound/pci    es137x.c 
  Log:
  Use both (enabled by default) DAC1 and DAC2 to provide 2
  distinct hardware playback channels. DAC configuration can be
  accessed through kernel hint - hint.pcm.<unit>.dac="val" with
  following possible values:
  
     0 = Enable both DACs (default)
     1 = Enable single DAC (DAC1)
     2 = Enable single DAC (DAC2)
     3 = Enable both DACs, swap position (DAC2 comes first instead
         of DAC1)
  
  Special case for ES1370:
     Unlike ES1371,2,3/CT5880, volume for each DAC 1 and 2 can be
     controlled indepedently (synth for DAC1, pcm for DAC2). It is
     possible that user will confuse by this behaviour, since both
     DACs are enabled by default. Thus, provide a knob through sysctl
     hw.snd.pcm<unit>.single_pcm_mixer:
       0 = each DACs will be controlled separately (synth/pcm).
       1 = combine both DACs volume mixer controller into a single
           "pcm" (default)
     As a side note, fixed rate operation (provided by previous
     commit) is not a mandatory if the configuration space does not
     involve DAC2 (perhaps disabled by user through the above kernel
     hint). Unlike DAC2, DAC1 has its own register / control space,
     not affected by the speed settings of ADC.
  
  Tested by:      multimedia@
  Approved by:    netchild (mentor)
  
  Revision  Changes    Path
  1.58      +473 -105  src/sys/dev/sound/pci/es137x.c