Linux如何写一个I2C设备驱动_LinuxI2C驱动开发流程

static const struct i2c_device_id my_i2c_device_id[] = {
    { "my_sensor", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, my_i2c_device_id);

static const struct of_device_id my_of_match[] = {
    { .compatible = "manufacturer,my-sensor" },
    { }
};
MODULE_DEVICE_TABLE(of, my_of_match);

static int my_probe(struct i2c_client *client,
                    const struct i2c_device_id *id)
{
    // 设备探测成功后初始化硬件、注册字符设备等
    dev_info(&client->dev, "Device probed successfully\n");
    return 0;
}

static int my_remove(struct i2c_client *client)
{
    // 清理资源
    return 0;
}

static struct i2c_driver my_i2c_driver = {
    .driver = {
        .name   = "my_sensor",
        .of_match_table = my_of_match,
    },
    .probe      = my_probe,
    .remove     = my_remove,
    .id_table   = my_i2c_device_id,
};

&i2c1 {
    status = "okay";
    my_sensor@48 {
        compatible = "manufacturer,my-sensor";
        reg = <0x48>;
    };
};

static int __init my_driver_init(void)
{
    return i2c_add_driver(&my_i2c_driver);
}
module_init(my_driver_init);

static void __exit my_driver_exit(void)
{
    i2c_del_driver(&my_i2c_driver);
}
module_exit(my_driver_exit);