Info needed for creative SB 0220 with STAC9758 codec, to get the REAR channels working.

[James Courtier-Dutton <James@superbug.demon.co.uk>]

Just for everyone's information.
I now have all the info I need to get the Rear channel working.
I thank Voluspa for giving me ssh root access so that I could find out 
the details via trial and error.

But the summary is: -
This tells the emu10k1 chip which slots to fill on the AC-LINK between 
the emu10k1 and the stac9758.
snd_emu10k1_ptr_write(emu, AC97SLOT, 0, XXX);

Where XXX is:
/* bit 0 is AC97SLOT_REAR_LEFT
  * bit 1 is AC97SLOT_REAR_RIGHT
  * bit 2 is Unknown, Maybe spdif. Not tested.
  * bit 3 is Unknown, Maybe spdif. Not tested.
  * bit 4 is AC97SLOT_CNTR
  * bit 5 is AC97SLOT_LFE
  */
So, for the stac9758, we would set XXX to  0x33

DSP code: -
OP(icode, &ptr, iACC3, EXTOUT(13)...   <- Rear Left
OP(icode, &ptr, iACC3, EXTOUT(14)...   <- Rear Right

Cheers
James


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