cmf_read
extern u64 cmf_read(struct ccw_device *cdev, int index);
unsigned long u = cmf_read(to_ccwdev(dev), avg_utilization);
EXPORT_SYMBOL_GPL(cmf_read);
return sysfs_emit(buf, "%lld\n", cmf_read(to_ccwdev(dev), idx));
count = cmf_read(cdev, cmb_sample_count);