模拟一个uart driver，支持多个uart port。
linux 虚拟hwmon 驱动实现，用于无开发板学习linux hwmon 子系统的驱动开发，涉及hwmon、i2c、platform等驱动知识点。本次使用hwmon新版本的接口实现hwmon的参数
使用tty提供的接口，完成虚拟uart的创建
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