hdspm.c - confused about SNDRV_HDSPM_IOCTL_GET_[CONFIG|STATUS]

hdspm.c - confused about SNDRV_HDSPM_IOCTL_GET_[CONFIG|STATUS]

[Jörn Nettingsmeier]

hi *!


i'm trying to extend hdspconf to work with the rme hdspm madi card, and 
got confused over the snd_hdspm_hwdep_ioctl:

apparently, the hdspm.c driver differentiates between settable controls 
(CONFIG) and non-settable status indicators (STATUS), unlike the earlier 
hdspm.c.

however, usage seems a bit inconsistent:

struct hdspm_config contains a member madi_sync_check, which is 
apparently never set.
instead, struct hdspm_status card_specific.sync_madi is used, same for 
tco and sync in.

but there is a wordclock_sync_check in struct hdspm_config which is in use.

am i guessing right that the latter is somewhat deprecated and that i 
should be taking all status values from struct hdspm_status instead?

thanks,


jörn


please cc: me, i'm not on alsa.devel.



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Re: hdspm.c - confused about SNDRV_HDSPM_IOCTL_GET_[CONFIG|STATUS]

[Takashi Iwai]

At Sun, 15 May 2011 18:31:47 +0200,
Jörn Nettingsmeier wrote:
> 
> hi *!
> 
> 
> i'm trying to extend hdspconf to work with the rme hdspm madi card, and 
> got confused over the snd_hdspm_hwdep_ioctl:
> 
> apparently, the hdspm.c driver differentiates between settable controls 
> (CONFIG) and non-settable status indicators (STATUS), unlike the earlier 
> hdspm.c.
> 
> however, usage seems a bit inconsistent:
> 
> struct hdspm_config contains a member madi_sync_check, which is 
> apparently never set.

This was also in the older version, and the structure wasn't changed
for compatibility reason.

> instead, struct hdspm_status card_specific.sync_madi is used, same for 
> tco and sync in.
> 
> but there is a wordclock_sync_check in struct hdspm_config which is in use.
> 
> am i guessing right that the latter is somewhat deprecated and that i 
> should be taking all status values from struct hdspm_status instead?

Well, consider GET_STATUS as a kind of extended attributes.


Takashi
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