linux 按键驱动中断

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

#define KEYBOARD_IRQ 1 // 假设键盘中断号为1

static irqreturn_t keyboard_interrupt_handler(int irq, void *dev_id) {
    struct input_dev *input_dev = (struct input_dev *)dev_id;
    
    // 读取按键状态
    int key_state = read_keyboard_state();
    
    if (key_state == KEY_PRESSED) {
        // 报告按键按下事件
        input_report_key(input_dev, KEY_A, 1);
        input_sync(input_dev);
        
        // 报告按键释放事件
        input_report_key(input_dev, KEY_A, 0);
        input_sync(input_dev);
    }
    
    return IRQ_HANDLED;
}

static int __init keyboard_init(void) {
    struct input_dev *input_dev;
    
    // 分配输入设备
    input_dev = input_allocate_device();
    if (!input_dev) {
        printk(KERN_ERR "Failed to allocate input device
");
        return -ENOMEM;
    }
    
    // 设置输入设备属性
    input_dev->name = "keyboard";
    input_dev->id.bustype = BUS_USB;
    input_dev->evbit[0] = BIT_MASK(EV_KEY);
    input_dev->keybit[BIT_WORD(KEY_A)] = BIT_MASK(KEY_A);
    
    // 注册输入设备
    if (input_register_device(input_dev)) {
        printk(KERN_ERR "Failed to register input device
");
        input_free_device(input_dev);
        return -ENODEV;
    }
    
    // 请求中断
    if (request_irq(KEYBOARD_IRQ, keyboard_interrupt_handler, IRQF_SHARED, "keyboard", input_dev)) {
        printk(KERN_ERR "Failed to request IRQ
");
        input_unregister_device(input_dev);
        return -EBUSY;
    }
    
    printk(KERN_INFO "Keyboard driver loaded
");
    return 0;
}

static void __exit keyboard_exit(void) {
    free_irq(KEYBOARD_IRQ, NULL);
    printk(KERN_INFO "Keyboard driver unloaded
");
}

module_init(keyboard_init);
module_exit(keyboard_exit);

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