linux input按键驱动

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

static struct input_dev *virt_key_dev;

static void virt_key_event(struct work_struct *work) {
    struct input_event ev;
    memset(&ev, 0, sizeof(ev));
    ev.type = EV_KEY;
    ev.code = KEY_A;
    ev.value = 1; // Key press
    input_event(virt_key_dev, &ev);
    ev.value = 0; // Key release
    input_event(virt_key_dev, &ev);
}

static DECLARE_WORK(virt_key_work, virt_key_event);

static int __init virt_key_init(void) {
    int ret;

    virt_key_dev = input_allocate_device();
    if (!virt_key_dev) {
        printk(KERN_ERR "Failed to allocate input device\n");
        return -ENOMEM;
    }

    virt_key_dev->name = "Virtual Keyboard";
    virt_key_dev->id.bustype = BUS_USB;
    virt_key_dev->id.vendor = 0x1234;
    virt_key_dev->id.product = 0x5678;
    virt_key_dev->id.version = 1;

    set_bit(EV_KEY, virt_key_dev->evbit);
    set_bit(KEY_A, virt_key_dev->keybit);

    ret = input_register_device(virt_key_dev);
    if (ret) {
        printk(KERN_ERR "Failed to register input device\n");
        input_free_device(virt_key_dev);
        return ret;
    }

    schedule_work(&virt_key_work);
    return 0;
}

static void __exit virt_key_exit(void) {
    flush_work(&virt_key_work);
    input_unregister_device(virt_key_dev);
}

module_init(virt_key_init);
module_exit(virt_key_exit);

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