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Linux I2C 框架终于讲透了:从设备树到 probe(),再到一次真实读写

  • 2026-08-18 23:11:45
Linux I2C 框架终于讲透了:从设备树到 probe(),再到一次真实读写
I2C是嵌入式设备中比较常见的低速通信总线，常用于连接传感器、触摸芯片、EEPROM和电源管理芯片等外设。
在Linux内核中，I2C并不是由单个驱动独立完成全部工作，而是通过控制器驱动、设备驱动和I2C Core分层协作。
把整个过程串起来，可以理解为：
设备树负责描述硬件，i2c_adapter表示控制器总线，i2c_client表示具体外设，i2c_driver负责设备功能，I2C Core则处理匹配关系和传输调度。
理解这些对象之间的关系以后，再阅读I2C驱动源码时，就不只是关注probe函数，而是能够沿着设备创建、驱动匹配和数据传输的路径，判断每一层分别承担什么工作。#Linux常用命令#命令行操作技巧#技术分享#Linux常用命令大全#Linux学习笔记#Linux根目录结构#一图看懂Linux目录#系统管理入门指南#新手如何学Linux#Linux目录详解#Linux小白必看#Linux命令快捷键#Linux系统探索#信息安全#网络工程师#网络安全#网络畅通无阻#信息化时代#计算机#路由器#互联网#网络#计算机专业
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  1. CONNECT:[ UseTime:0.000805s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001496s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004492s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005352s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001258s ]
  6. SELECT * FROM `set` [ RunTime:0.018135s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001544s ]
  8. SELECT * FROM `article` WHERE `id` = 508996 LIMIT 1 [ RunTime:0.112670s ]
  9. UPDATE `article` SET `lasttime` = 1787323811 WHERE `id` = 508996 [ RunTime:0.013710s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.006107s ]
  11. SELECT * FROM `article` WHERE `id` < 508996 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003108s ]
  12. SELECT * FROM `article` WHERE `id` > 508996 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.025602s ]
  13. SELECT * FROM `article` WHERE `id` < 508996 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.285371s ]
  14. SELECT * FROM `article` WHERE `id` < 508996 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.122640s ]
  15. SELECT * FROM `article` WHERE `id` < 508996 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.123057s ]
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