Notes on Linux I2C

vmlinz posted @ Wed, 29 Jun 2011 14:57:23 +0800 in Linux with tags linux driver i2c , 3448 readers

Linux i2c 笔记

i2c 总线简介

i2c(IIC, 读作/ˈaɪ skwɛərd ˈsiː/或者/ˈaɪ tuː ˈsiː/) 的意思是inter IC,也就是芯片间通信。i2c 总线是由Philips 在80年代早期设计的,用来实现同一个电路板上的各个芯片之间简易通信的总线。

i2c 的主要特性

  • 只有两条连接线,SDL(串行数据线)和SCL(串行时钟线)
  • 没有严格的波特率要求
  • 芯片间是简单的主/从关系,每个总线上的设备可以通过一个唯一的地址识别
  • i2c 是一个真正的多主总线,提供仲裁逻辑和冲突检测

i2c 子系统架构

i2c 子系统架构

  • i2c-client i2c 总线上的设备驱动
  • i2c-core 子系统实现的i2c 协议以及其他公共工具函数
  • i2c-algorithm 通用算法,给i2c-adapter 驱动提供和子系统交互的接口
  • i2c-adapter 操作特定的i2c 总线硬件,实现核心子系统中提供的总线操作
  • i2c-dev 用于实现用户空间的i2c 驱动

i2c 总线驱动

  • struct i2c_adapter; i2c 总线驱动硬件适配结构体,实现具体总线的操作
  • struct i2c_algorithm; i2c 总线驱动的具体操作接口,实现新总线操作时需要实现这个具体的硬件操作接口
  • int i2c_add_adapter(struct i2c_adapter *); 添加总线驱动
  • int i2c_del_adapter(struct i2c_adapter *); 删除总线驱动

i2c 设备驱动

  • struct i2c_client; i2c 设备结构体,包含struct device,用于向驱动模型注册设备
  • struct i2c_driver; i2c 驱动结构体,包含struct device_driver,向系统注册驱动
  • int i2c_register_driver(struct module *, struct i2c_driver *); 注册设备驱动
  • void i2c_del_driver(struct i2c_driver *); 删除设备驱动

i2c 设备和驱动匹配

  • int i2c_register_driver(struct module *, struct i2c_driver *); 阅读这个函数来理解i2c 设备和驱动的动态绑定过程,其中分成两种情况。一种是类似于驱动模型的probe 过程,另一种是调用attach函数。

i2c 相关的资源和链接

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