keybd.c

在linux下编译

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <asm/io.h>
#include <linux/init.h>

#define MY_WORK_QUEUE_NAME "WQsched.c"

static struct workqueue_struct *my_workqueue;

static void get_char(void *scancode)
{
	printk("Scan Code %x %s.\n",
	       (int)*((char *)scancode) & 0x7F,
	       *((char *)scancode) & 0x80 ? "Released" : "Pressed");
}

irqreturn_t keyboard_irq (int irq, void * dev_id)//, struct pt_regs * regs
{
	static int initialised = 0;
	static unsigned char scancode;
	static struct work_struct task;
	unsigned char status;

	status = inb(0x64);
	scancode = inb(0x60);

	if (initialised == 0) {
		INIT_WORK(&task, get_char);
		initialised = 1;
	} else {
		PREPARE_WORK(&task, get_char);
	}

	queue_work(my_workqueue, &task);

	return IRQ_HANDLED;
}

int init_module()
{
	my_workqueue = create_workqueue(MY_WORK_QUEUE_NAME);

	free_irq(1, NULL);

	return request_irq(1,	
			   keyboard_irq,	
			   SA_SHIRQ, "test_keyboard_irq_handler",
			   (void *)(keyboard_irq));
}

void cleanup_module()
{
	free_irq(1, NULL);
}

MODULE_LICENSE("GPL");