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| /freebsd-11.0-release/sys/dev/sound/pci/ | ||
| H A D | es137x.c | diff 152419 Mon Nov 14 18:17:31 MST 2005 ariff 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) |
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