在Linux内核驱动中，构建一个环形队列，struct ring_buffer { int head; int tail; struct msg *data; int size; unsigned int capacity; };其中存放的是定义如下的结构体struct msg { u16 module_id; u16 cmd_id; u16 cmd_subid; u16 complete; u8 data[128]; };，请你给出操作这个环形队列的功能函数，分别为：初始化、入队、出队、注销、判断空、判断满，再写两个函数，函数一构建msg，各成员赋值为常数，并向队列中放置msg，函数二将msg从队列中取出来，解析msg中的module_id，如果该值不为0x1，则报错，否则使用switch函数解析cmd_id，并根据不同的cmd_id再解析cmd_subid，并将msg中的complete成员设置为1，函数一使用usleep_range()函数等待complete设置为1后，退出函数，函数一和函数二需要使用队列的操作函数，在驱动的probe和remove函数中注册和注销ring_buffer

1. 初始化函数：

void ring_buffer_init(struct ring_buffer *rb, unsigned int capacity) {
    rb->head = 0;
    rb->tail = 0;
    rb->data = kmalloc(capacity * sizeof(struct msg), GFP_KERNEL);
    rb->size = 0;
    rb->capacity = capacity;
}

2. 入队函数：

int ring_buffer_enqueue(struct ring_buffer *rb, struct msg *msg) {
    if (ring_buffer_full(rb)) {
        return -1;
    }
    rb->data[rb->tail] = *msg;
    rb->tail = (rb->tail + 1) % rb->capacity;
    rb->size++;
    return 0;
}

3. 出队函数：

int ring_buffer_dequeue(struct ring_buffer *rb, struct msg *msg) {
    if (ring_buffer_empty(rb)) {
        return -1;
    }
    *msg = rb->data[rb->head];
    rb->head = (rb->head + 1) % rb->capacity;
    rb->size--;
    return 0;
}

4. 注销函数：

void ring_buffer_destroy(struct ring_buffer *rb) {
    kfree(rb->data);
    rb->data = NULL;
    rb->head = 0;
    rb->tail = 0;
    rb->size = 0;
    rb->capacity = 0;
}

5. 判断空函数：

int ring_buffer_empty(struct ring_buffer *rb) {
    return rb->size == 0;
}

6. 判断满函数：

int ring_buffer_full(struct ring_buffer *rb) {
    return rb->size == rb->capacity;
}

7. 构建msg函数：

void build_msg(struct msg *msg, u16 module_id, u16 cmd_id, u16 cmd_subid) {
    msg->module_id = module_id;
    msg->cmd_id = cmd_id;
    msg->cmd_subid = cmd_subid;
    msg->complete = 0;
    memset(msg->data, 0, sizeof(msg->data));
}

8. 取出msg函数：

void parse_msg(struct ring_buffer *rb, struct msg *msg) {
    if (msg->module_id != 0x1) {
        printk(KERN_ERR "Wrong module ID\n");
        return;
    }
    switch (msg->cmd_id) {
        case 0x1:
            // parse cmd_subid for cmd_id 0x1
            break;
        case 0x2:
            // parse cmd_subid for cmd_id 0x2
            break;
        default:
            printk(KERN_ERR "Unknown cmd ID\n");
            return;
    }
    msg->complete = 1;
    while (!msg->complete) {
        usleep_range(1000, 2000);
    }
    // do something after msg is complete
}

9. 注册函数：

struct ring_buffer *rb;

static int my_driver_probe(struct platform_device *pdev) {
    rb = kmalloc(sizeof(struct ring_buffer), GFP_KERNEL);
    ring_buffer_init(rb, 10);
    // do something else
    return 0;
}

static int my_driver_remove(struct platform_device *pdev) {
    ring_buffer_destroy(rb);
    kfree(rb);
    rb = NULL;
    // do something else
    return 0;
}

static const struct of_device_id my_driver_of_match[] = {
    { .compatible = "my_driver", },
    {},
};
MODULE_DEVICE_TABLE(of, my_driver_of_match);

static struct platform_driver my_driver = {
    .probe = my_driver_probe,
    .remove = my_driver_remove,
    .driver = {
        .name = "my_driver",
        .of_match_table = my_driver_of_match,
        .owner = THIS_MODULE,
    },
};
module_platform_driver(my_driver);