ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
ret = dev->driver->suspend(dev, state);
static int ac97_bus_suspend(struct device *dev, pm_message_t state){	int ret = 0;	if (dev->driver && dev->driver->suspend)		ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);	return ret;}