Hi Andreas,
At Mon, 9 Sep 2002 11:41:02 +0200,
Andreas Mohr wrote:
>
> Hi Takashi !
>
> On Mon, Sep 09, 2002 at 11:05:15AM +0200, Takashi Iwai wrote:
> > Hi Andreas,
> >
> > At Sun, 8 Sep 2002 11:16:59 +0200,
> > Andreas Mohr wrote:
> > >
> > > Hi all,
> > >
> > > I'm currently in the process of developing a driver for this soundcard
> > > (that's one of about 6 unsupported cards in the support matrix).
>
> [...]
>
> > > Also, I'd really like to talk to someone who is pretty intimate with
> > > the operation of several sound card drivers.
> >
> > great! please send us the patch if you finish the code.
> > we can merge it into alsa-driver cvs tree (not alsa-kernel at first)
> > for review and tests.
> Thanks !
>
> I just discovered that Aztech claims AC97 codec compatibility:
> " AZF3328 is a single low cost PCI audio sound chip that has built-in
> AC'97 CODEC, game port, MPU401 and a I2S serial bus for external DAC. "
>
> However, the mixer register set I found varies a lot from the AC97 layout:
> ******** io base addr of esi+d ("mixer_port") ********
> +00h: in.
>
(snip)
> +00h doesn't seem to be the config register the AC97 spec claims it should be
> (simply returns 00h when queried),
> and many other register offsets are 2 bytes off (PC Beep 08h instead of 0ah,
> ModemIn/Phone Volume 0ah of 0ch, Mic Volume 0ch instead of 0eh, ...)
yes. perhaps modem-in corresponds to the mono on ac97.
the range from 0x02 to 0x18 on ac97 corresponds to 0x00 - 0x16 on
aztech, but others are apparently not.
> Are you able to enlighten me on these differences ?
> Any hints you can give me about achieving AC97 programming here ?
i guess it's NOT really compatible with ac97. or is there any
reigster to change the behavior?
anyway, we don't have to stick with ac97 in this case. the mixer
controls can be built in the driver.
ciao,
Takashi
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