linux 鼠标驱动编写

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/input.h>

// 定义鼠标的结构体
struct my_mouse {
    struct usb_device *udev;
    struct input_dev *input;
};

// USB鼠标探测函数
static int my_mouse_probe(struct usb_interface *interface, const struct usb_device_id *id)
{
    struct my_mouse *mouse;
    struct input_dev *input_dev;
    int retval;

    mouse = kzalloc(sizeof(struct my_mouse), GFP_KERNEL);
    if (!mouse)
        return -ENOMEM;

    mouse->udev = interface_to_usbdev(interface);

    input_dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
    if (!input_dev) {
        kfree(mouse);
        return -ENOMEM;
    }

    mouse->input = input_dev;

    // 设置输入设备属性
    input_dev->name = "My USB Mouse";
    input_dev->id.bustype = BUS_USB;
    input_dev->dev.parent = &interface->dev;

    // 设置事件类型
    set_bit(EV_KEY, input_dev->evbit);
    set_bit(BTN_LEFT, input_dev->keybit);
    set_bit(BTN_RIGHT, input_dev->keybit);
    set_bit(EV_REL, input_dev->evbit);
    set_bit(REL_X, input_dev->relbit);
    set_bit(REL_Y, input_dev->relbit);

    // 注册输入设备
    retval = input_register_device(input_dev);
    if (retval) {
        kfree(input_dev);
        kfree(mouse);
        return retval;
    }

    // 这里可以添加更多的初始化代码，如数据读取等

    usb_set_intfdata(interface, mouse);
    return 0;
}

// USB鼠标断开连接函数
static void my_mouse_disconnect(struct usb_interface *interface)
{
    struct my_mouse *mouse;
    mouse = usb_get_intfdata(interface);
    if (mouse) {
        input_unregister_device(mouse->input);
        kfree(mouse->input);
        kfree(mouse);
        usb_set_intfdata(interface, NULL);
    }
}

// USB设备ID匹配表
static struct usb_device_id my_mouse_table[] = {
    { USB_DEVICE(0x1234, 0x5678) },// 这里填写实际的VID和PID
    {}
};
MODULE_DEVICE_TABLE(usb, my_mouse_table);

// 驱动模块信息
static struct usb_driver my_mouse_driver = {
    .name = "my_usb_mouse",
    .id_table = my_mouse_table,
    .probe = my_mouse_probe,
    .disconnect = my_mouse_disconnect,
};

module_usb_driver(my_mouse_driver);

MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple USB mouse driver example");
MODULE_LICENSE("GPL");