On Sun, 14 Dec 2003, Arve Knudsen wrote:
> On Mon, 15 Dec 2003 01:17:26 +0900, Patrick Shirkey
> <[EMAIL PROTECTED]> wrote:
>
> > If we have a DB of info how would we define the abilities of each device?
> >
> > I assume this info is available in the driver layer because there is a
> > point where ALSA will return false eg. if a card is not able to run at
> > 48000Hz
> >
> > My opinion is that a simple function could be included in alsactl which
> > scans for available devices, makes a list of their abilities. Everyone
> > uses "post-insert alsactl restore" in the modules.conf file so it would
> > be essentially a non issue from a user perspective.
> >
> > Couldn't this be saved in the config settings for alsactl?
> This whole database thing seems like overkill to me, to be honest. This is
> dynamic information would best be obtained from cards during operation,
> the only problem is that you have to lock the device. A better design would
> be to, if possible, allow the configuration space to be read even when a
> device is streaming.
>
> I dont know the dirty details of writing drivers, but would this be a
> problem? Perhaps we could differ between read-locked and write-locked
> configuration, so there would be inclusive read access to the device, and
> totally exclusive access if it is to be modified.
Again, the configuration space is runtime information and it might depend
if a stream is active for given card. So, information might be useless
(different).
Again, much better is to give this information from the user space rather
than adding code to the drivers. We may also describe the constraints
here.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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