ac97 - generic AC97 codec driver
AC97 codecs contain the analog-to-digital (A/D), digital-toanalog (D/A),
and mixing circuitry of many modern sound cards. AC97
codecs, for the
most part, do not talk to host busses like the PCI bus directly. Instead,
they communicate through an interface chip, called
the host controller.
The Ensoniq AudioPCI 97 (see eap(4)) is an example
of such a
Unlike many drivers, the ac97 driver does not appear in the
file. Instead, the driver is automatically attached by the
auich(4), autri(4), auvia(4), clcs(4), clct(4), eap(4),
fms(4), maestro(4), neo(4), yds(4)
The ac97 driver does not keep track of the current user settings and instead
relies on the hardware to do this.
The ac97 driver could do more to detect mixer channels that
and cull them from the list.
OpenBSD 3.6 October 7, 1999
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