Re: au88x0 - Replace spdif frequency control by IEC958 control

[Raymond <rayau@netvigator.com>]

>> 1) What is the difference between Consumer mode and Professional mode ?

> A different set of status bits.  See, for example, ALSA"s asoundef.h,
> but it doesn"t have many explanations.
>
> The main difference is that only consumer mode has the copyright bit
> so that devices can automatically disable copying.


The parameter 'spdif_mode' in the routine 
vortex_spdif_init(vortex,spdif_sr,spdif_mode) in au88x0_core.c seems to 
control AC3 passthrough.

However the two memory mapped I/O VORTEX_SPDIF_CFG0 and 
VORTEX_SPDIF_CFG1 seem to be write-only, return zero when read.

The value of memory mapped I/O VORTEX_SPDIF_FLAGS are changing between 
00138014 and 00138015

1) Which bit in the IEC958 control is related to AC3 passthrough ?

As vortex_spdif_init() only handle changing SPDIF sample rate.

2) Do the driver need to initialise vortex->spdif_sr to 48000 or just 
let alsactl restore the value from /etc/asound.state ?

3) Is it correct to return the following value in 
snd_vortex_spdif_mask_get() ?
ucontrol->value.iec958.status[3] = IEC958_AES3_CON_FS;

4) Is it correct to return the following value in 
snd_vortex_spdif_default_get() ?
ucontrol->value.iec958.status[1] =IEC958_AES1_CON_ORIGINAL | 
IEC958_AES1_CON_DIGDIGCONV_ID;

5) What additional kcontrol and routine are needed for SPDIF IN ?








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