linux uart设备驱动

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/serial_core.h>

static struct uart_port *uart_port;

static int my_uart_open(struct inode *inode, struct file *file) {
    // 初始化UART端口
    uart_port = kmalloc(sizeof(struct uart_port), GFP_KERNEL);
    if (!uart_port)
        return -ENOMEM;
    // 配置UART参数
    uart_port->iobase = 0x3F8; // 示例IO地址
    uart_port->irq = 4;        // 示例中断号
    uart_port->uartclk = 1843200;
    uart_port->fifosize = 16;
    uart_port->ops = &my_uart_ops;
    uart_add_one_port(&uart_driver, uart_port);
    return 0;
}

static int my_uart_release(struct inode *inode, struct file *file) {
    uart_remove_one_port(&uart_driver, uart_port);
    kfree(uart_port);
    return 0;
}

static ssize_t my_uart_read(struct file *file, char __user *ubuf, size_t count, loff_t *ppos) {
    // 实现读取数据的逻辑
    return 0;
}

static ssize_t my_uart_write(struct file *file, const char __user *ubuf, size_t count, loff_t *ppos) {
    // 实现写入数据的逻辑
    return 0;
}

static const struct file_operations my_uart_fops = {
    .owner = THIS_MODULE,
    .open = my_uart_open,
    .release = my_uart_release,
    .read = my_uart_read,
    .write = my_uart_write,
};

static struct uart_driver my_uart_driver = {
    .owner = THIS_MODULE,
    .driver_name = "my_uart",
    .dev_name = "ttyMYUART",
    .major = 240,
    .minor = 0,
    .nr = 1,
};

static int __init my_uart_init(void) {
    int ret;
    ret = uart_register_driver(&my_uart_driver);
    if (ret)
        return ret;
    ret = register_chrdev_region(MKDEV(my_uart_driver.major, 0), my_uart_driver.nr, "my_uart");
    if (ret)
        uart_unregister_driver(&my_uart_driver);
    return ret;
}

static void __exit my_uart_exit(void) {
    unregister_chrdev_region(MKDEV(my_uart_driver.major, 0), my_uart_driver.nr);
    uart_unregister_driver(&my_uart_driver);
}

module_init(my_uart_init);
module_exit(my_uart_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("A simple UART driver");
MODULE_AUTHOR("Your Name");