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.