do {
	ret = read(&cnt, "/sys/power/wakeup_count");
	if (ret) {
		ret = write(cnt, "/sys/power/wakeup_count");
			pm_save_wakeup_count(val)
				saved_count = count;	// 将处理完的wakeup events总数存放在saved_count里
	} else
		countine;
} while (!ret);
// 启动suspend
write("mem", "/sys/power/state");