[alsa-devel] hdspm.c - confused about SNDRV_HDSPM_IOCTL_GET_[CONFIG|STATUS]
tiwai at suse.de
Wed May 18 18:17:37 CEST 2011
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
> 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.
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