ata_device_ioctl
int ata_device_ioctl(device_t dev, u_long cmd, caddr_t data);
return ata_device_ioctl(ap->a_head.a_dev->si_drv1, ap->a_cmd, ap->a_data);
error = ata_device_ioctl(dev, ap->a_cmd, ap->a_data);
return ata_device_ioctl(ap->a_head.a_dev->si_drv1, ap->a_cmd, ap->a_data);
error = ata_device_ioctl(dev, ap->a_cmd, ap->a_data);