I2C 设备驱动

V5.10

参考文档：Documentation/i2c/writing-clients.rst

  static struct i2c_device_id foo_idtable[] = {{ "foo", my_id_for_foo },{ "bar", my_id_for_bar },{ }};MODULE_DEVICE_TABLE(i2c, foo_idtable);static struct i2c_driver foo_driver = {.driver = {.name	= "foo",.pm	= &foo_pm_ops,	/* optional */},.id_table	= foo_idtable,.probe		= foo_probe,.remove		= foo_remove,/* if device autodetection is needed: */.class		= I2C_CLASS_SOMETHING,.detect		= foo_detect,.address_list	= normal_i2c,.shutdown	= foo_shutdown,	/* optional */.command	= foo_command,	/* optional, deprecated */}

创建设备

章节：Device Creation

情景一、已知设备连接总线与地址

i2c_new_client_device()，通过实例化(地址与设备名)结构体i2c_board_info后即创建了设备，此时I2C核心会自动识别并匹配(调用probe)该设备对应的驱动。
情景二、已知设备连接的I2C总线号但不知道地址

i2c_new_scanned_device()，可以列出可能的匹配的I2C地址。

删除设备

i2c_unregister_device()

初始化设备

  static int __init foo_init(void){return i2c_add_driver(&foo_driver);}module_init(foo_init);static void __exit foo_cleanup(void){i2c_del_driver(&foo_driver);}module_exit(foo_cleanup);