attr_min
cip = container_of(attr, struct pvr2_sysfs_ctl_item, attr_min);
sysfs_attr_init(&cip->attr_min.attr);
cip->attr_min.attr.name = "min_val";
cip->attr_min.attr.mode = S_IRUGO;
cip->attr_min.show = show_min;
cip->attr_gen[acnt++] = &cip->attr_min.attr;
struct device_attribute attr_min;
cnt = sizeof(pa_min_sync_length) / sizeof(struct attr_min);