PCMUNIT
return (devclass_get_softc(pcm_devclass, PCMUNIT(dev)));
bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
bdev = devclass_get_device(pcm_devclass, PCMUNIT(dev));
unit = PCMUNIT(i_dev);
ai->mixer_dev = (d->mixer_dev != NULL) ? PCMUNIT(d->mixer_dev) : -1;
unit = PCMUNIT(i_dev);