ac97_amp_enable
ac97_amp_enable(dev, true);
ac97_amp_enable(dev, false);
ac97_amp_enable(dev, false);
ac97_amp_enable(dev, true);
void ac97_amp_enable(ac97_dev *dev, bool onoff);
void ac97_amp_enable(device_config *config, bool yesno);
ac97_amp_enable(&card->config, true);