int (*probe)(struct i2c_client * , const struct i2c_device_id *); int (*remove)(struct i2c_client *); struct device_driver driver; const struct i2c_device_id *id_table; }; //注册与注销: int i2c_add_driver(struct i2c
在probe_new函数中,分配、设置、注册file_operations结构体。 在file_operations的函数中,使用i2c_transfer等函数发起I2C传输。 2. 编写i2c_driver 2.1 先写一个框架 2.2 在为AP3216C编写代码 百问网的开发板上有光感芯片AP3216C: AP3216C是红外、光强、距离三合一的传感器,以读出光强、距离值为例,步骤如下: ...
returni2c_match_id(driver->id_table, client) !=NULL; return0; } i2c_verify_client函数用于验证设备是否是有效的 I2C 客户端设备。 进行OF (Open Firmware) 风格的匹配,通过调用of_driver_match_device函数来检查设备和驱动程序之间是否存在匹配关系。 如果OF 风格的匹配失败,则尝试进行 ACPI (Advanced Config...
driver) int i2c_register_driver(struct module *owner, struct i2c_driver *driver) { int res; /* Can't register until after driver model init */ if (unlikely(WARN_ON(!i2c_bus_type.p))) return -EAGAIN; /* add the driver to the list of i2c drivers in the driver core ...
25. printk(KERN_ERR "%s: Driver Initialisation failed\n", __FILE__); 26. return res; 27. } 28. static void __exit i2c_dev_exit(void) 29. { 30. bus_unregister_notifier(&i2c_bus_type, &i2cdev_notifier); 31. i2c_for_each_dev(NULL, i2cdev_detach_adapter); ...
编写一个I2C设备驱动程序的工作可分为两部分,一是定义和注册I2C设备,即i2c_client;二是定义和注册I2C设备驱动,即i2c_driver。下面我们就以mini2440的I2C设备at24c08 EEPROM为例,介绍如何完成这两个工作。 一、定义和注册I2C设备 步骤1:用i2c_board_info保存I2C设备相关信息 在Linux中,struct i2c_client代表一个I2C设...
* Systems using the Linux I2C driver stack can declare tables of board info * while they initialize. This should be done in board-specific init code * near arch_initcall() time, or equivalent, before any I2C adapter driver is * registered. For example, mainboard init code could define sev...
I've even gone as far as comparing my code against the I2C driver in XMClib and my code is setting up the USIC registers in an identical fashion to how the XMClib code does it.Can this be a hardware issue? I'm thinking that I see no I2C activity because the I2C peripheral somehow...
* Project: I2C Driver for STMicroelectronics STM32 devices Expand DownExpand Up@@ -228,6 +228,33 @@ static const ARM_I2C_CAPABILITIES driver_capabilities = { #defineMX_I2C_FILTER_EXISTS1 #endif // Define peripheral frequency macros if they are not provided in the MX_Device.h ...
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