标签：struct int bus adapter device ic i2c type
- DTS中的 i2c设备节点（子节点） (例如：AT24C02)被转化为i2c_client结构体，其所在的 i2c控制器节点（父节点）转化为platform_device 结构体，匹配到对应的 platform_driver 结构体，调用对应的 probe 函数，该函数中实现：①分配、设置、注册 i2c_adapter 结构体；②解析字节点，分配、设置、注册 i2c_client 结构体，该结构体对应i2c_bus 总线框架，匹配到对应的 i2c_driver 驱动，调用其中的 probe 函数，实现major、file_operations、register_chrdev、class_create，入口出口等。
-
struct i2c_adapter {
struct module *owner;
unsigned int class; /* classes to allow probing for */
const struct i2c_algorithm *algo; /* the algorithm to access the bus */
void *algo_data;
/* data fields that are valid for all devices */
const struct i2c_lock_operations *lock_ops;
struct rt_mutex bus_lock;
struct rt_mutex mux_lock;
int timeout; /* in jiffies */
int retries;
struct device dev; /* the adapter device */
int nr;
char name[48];
struct completion dev_released;
struct mutex userspace_clients_lock;
struct list_head userspace_clients;
struct i2c_bus_recovery_info *bus_recovery_info;
const struct i2c_adapter_quirks *quirks;
};
struct i2c_client {
unsigned short flags; /* div., see below */
unsigned short addr; /* chip address - NOTE: 7bit */
/* addresses are stored in the */
/* _LOWER_ 7 bits */
char name[I2C_NAME_SIZE];
struct i2c_adapter *adapter; /* the adapter we sit on */
struct device dev; /* the device structure */
int irq; /* irq issued by device */
struct list_head detected;
#if IS_ENABLED(CONFIG_I2C_SLAVE)
i2c_slave_cb_t slave_cb; /* callback for slave mode */
#endif
};
- probe中应用输入系统框架：
- 为了适配以前写好的应用程序，上述probe函数中 使用到了输入系统 input_dev；不再是实现 major 这些，因为以前的应用程序可能不会去open一个你创建的设备节点，现在要去适配以前的应用程序，所以用到输入系统。
标签：struct,
int,
bus,
adapter,
device,
ic,
i2c,
type
From： https://www.cnblogs.com/xuan01/p/16875118.html