NAME
ac97
- generic AC97 codec driver
DESCRIPTION
AC97 codecs contain the analog-to-digital (A/D), digital-to-analog
(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 host controller.
Unlike many drivers, the
ac97
driver does not appear in the configuration file.
Instead, the driver is automatically attached by the drivers that require it.
SEE ALSO
auacer(4),
auich(4),
auixp(4),
autri(4),
auvia(4),
clcs(4),
clct(4),
eap(4),
emuxki(4),
esa(4),
esm(4),
fms(4),
neo(4),
yds(4)
BUGS
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 don't work and cull
them from the list.