Re: spkr vs spkr_synth module

[Paul Goyette <paul%whooppee.com@localhost>]

On Mon, 12 Dec 2016, Christos Zoulas wrote:

> On Dec 12, 10:21pm, nat%netbsd.org@localhost (Nathanial Sloss) wrote:
> -- Subject: Re: spkr vs spkr_synth module
>
> | As for the module I think more platforms have audio than pcppi, so that spkr
> | synth should be the prominent one.
> |
> | And as for wskbd I was thinking that the bell function should use the speaker
> | ioctl. Opening /dev/speaker would either use pcppi or spkr_synth if they were
> | available.
>
> I was thinking of having /dev/speaker0, /dev/speaker1 etc and
> ln -s /dev/speaker0 /dev/speaker for compatibility. I.e. on pcppi machines
> allow both speakers to attach.

For that to work, we should create a spkr_bus attachment, which would be 
provided by both pcppi and audio drivers, and have a _single_ spkr 
driver which attaches at spkr_bus.  For modules, we'd also need to solve 
the problem of

	config(1) doesn't let you have "pseudo-root <attribute>"

It would also probably require some changes in subr_autoconf.c for 
config_{init,fini}_component's "frobbing" (inserting and removing) of 
new config structures (cf_driver, cf_attach, cf_data).

(This issue arose some time ago when I attempted to modularize the ld 
driver and all of its attachment points.  It also exists as entry #11 in 
src/doc/TODO.modules file.)


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