[alsa-devel] 7.1 surround channels missing on CS46xx

Ondrej Zary linux at rainbow-software.org
Thu May 16 12:55:26 CEST 2013

I got a Hercules Fortissimo 7.1 sound card (CS4624 + two CS4294) but 
snd-cs46xx driver supports only 6 channels (front, rear, center/lfe). The 
surround output (7&8) is not supported - as seen in dsp_spos_scb_lib.c:

       case DSP_PCM_S71_CHANNEL:
                /* TODO */

Tried to add a code for this, mostly copying the center/lfe code but I miss 
some data:
 - which slots (ACOSV_SLVx) should be used (maybe 10 and 12?)
 - what are the channel_disp and fifo_addr values for
   cs46xx_dsp_create_codec_out_scb() function
 - what values should S71_MIXER_SCB_ADDR and S71_CODEC_SCB_ADDR be (maybe
   0x1b0 and 0x1c0?)

Ondrej Zary

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