写一个iic的Linux驱动
时间: 2023-11-30 15:07:00 浏览: 73
以下是一个简单的 I2C 驱动程序,实现了 I2C 总线的初始化、读写操作:
```c
#include <linux/init.h>
#include <linux/module.h>
#include <linux/i2c.h>
static struct i2c_adapter *i2c_adap;
static struct i2c_client *i2c_client;
static int my_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
printk("my_i2c_probe called\n");
return 0;
}
static int my_i2c_remove(struct i2c_client *client)
{
printk("my_i2c_remove called\n");
return 0;
}
static const struct i2c_device_id my_i2c_id[] = {
{ "my_i2c_device", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, my_i2c_id);
static struct i2c_driver my_i2c_driver = {
.driver = {
.name = "my_i2c_driver",
.owner = THIS_MODULE,
},
.probe = my_i2c_probe,
.remove = my_i2c_remove,
.id_table = my_i2c_id,
};
static int __init my_i2c_init(void)
{
int ret;
i2c_adap = i2c_get_adapter(0);
if (!i2c_adap) {
printk(KERN_ERR "Failed to get I2C adapter\n");
return -ENODEV;
}
i2c_client = i2c_new_device(i2c_adap, &my_i2c_id[0]);
if (!i2c_client) {
printk(KERN_ERR "Failed to create I2C device\n");
i2c_put_adapter(i2c_adap);
return -ENODEV;
}
ret = i2c_add_driver(&my_i2c_driver);
if (ret) {
printk(KERN_ERR "Failed to add I2C driver\n");
i2c_unregister_device(i2c_client);
i2c_put_adapter(i2c_adap);
return ret;
}
return 0;
}
static void __exit my_i2c_exit(void)
{
i2c_del_driver(&my_i2c_driver);
i2c_unregister_device(i2c_client);
i2c_put_adapter(i2c_adap);
}
module_init(my_i2c_init);
module_exit(my_i2c_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("My I2C driver");
```
需要注意的是,这个驱动程序是一个简单的示例,可能需要根据实际情况进行修改。例如,需要实现 `my_i2c_probe` 和 `my_i2c_remove` 函数来处理设备的初始化和卸载操作,并且需要根据实际的硬件配置来初始化 I2C 总线。在实际项目中,还需要处理设备的读写操作等。