Audio driver template

Alexander Leidinger Alexander at
Tue Jul 10 08:08:33 UTC 2007

Quoting Christopher Davis <loafier at> (from Mon, 9 Jul 2007  
11:47:14 -0700):

> Thought I would take a look at the audio driver template as
> part of my task to modernize drivers, soc2007. I would simplify
> the read and write functions to avoid using the bus tag and
> handle, but I'm not sure what else to do to bring it up to date.
> How else can it be improved?

Putting it into the examples directory instead of having it on the  
people's own pages would be an improvement (the developer handbook  
needs to be changed to point to the examples directory then).

And you should clarify what kind of improvements are valid for your  
SoC work. Somehow I doubt that adding shiny new features (like hps  
suggested) is part of the goal for your work. I think it's more like  
bringing existing drivers up-to-par with currently available generic  
driver interfaces, isn't it?

I also think examples for suspend/resume stuff should be added.  
/sys/dev/sound/pci/atiixp.c has suspend and resume methods if you want  
an example.

You could also review the locking, as it changed a little bit  
recently, I think.

Apart from the atiixp driver the envy42, emu10kx and HDA drivers can  
also serve as examples for what is the most current in the sound  
subsystem in FreeBSD. Maybe you can gain some more hints from them (I  
think the template is not very up-to-date compared to them).

The new mixer interface is not used yet in the drivers, so we don't  
have examples at all for them. You could ask ryanb at (or on  
multimedia@) about it.

Ariff at (or multimedia@) can maybe help if you have some  
questions regarding the drivers in the tree (maybe Ariff will answer  
to your initial question anyway).


I guess the Little League is even littler than we thought.
		-- D. Cavett    Alexander @ PGP ID = B0063FE7       netchild @  : PGP ID = 72077137

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