#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <linux/keyboard.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/proc_fs.h>

#define PROC_FILE_NAME "mousectl"

struct timer_list my_timer;
struct input_dev *jerry;
struct notifier_block nb;

int kb_notifier_fn(struct notifier_block *nb, unsigned long action, void* data){
	struct keyboard_notifier_param *kp = (struct keyboard_notifier_param*)data;
	// kp->down inidicates if the key was pressed or released
	printk("Key:  %d  Lights:  %d  Shiftmax:  %x\n", kp->value, kp->ledstate, kp->shift);
	input_report_rel(jerry, REL_Y, 10);
	input_sync(jerry);
	return 0;
}

ssize_t move_mouse(struct file *filp,const char *buf,size_t count,loff_t *offp)
{
	char our_copy[16];
	int n;
	if(count < 2)
		return count;
	strncpy(our_copy, buf, 15);
	our_copy[(count < 16)? count:16] = 0;
       	sscanf(our_copy+1, "%d", &n);
	switch(buf[0]){
		case 'U':
			input_report_rel(jerry, REL_Y, -n);
			break;
		case 'D':
			input_report_rel(jerry, REL_Y, n);
			break;
		case 'R':
			input_report_rel(jerry, REL_X, n);
			break;
		case 'L':
			input_report_rel(jerry, REL_X, -n);
			break;
		case 'C':
			input_report_key(jerry, BTN_LEFT, n);
			break;
	}
	input_sync(jerry);
	return count;	
}

struct file_operations proc_fops = {
	write: move_mouse
};

static int __init mm_init(void)
{
	jerry = input_allocate_device();

	jerry->name = "jerry";
	set_bit(EV_REL, jerry->evbit);
	set_bit(REL_X, jerry->relbit);
	set_bit(REL_Y, jerry->relbit);

	set_bit(EV_KEY, jerry->evbit);
	set_bit(BTN_LEFT, jerry->keybit);
	
	input_register_device(jerry);
	proc_create(PROC_FILE_NAME,0,NULL,&proc_fops);
	nb.notifier_call = kb_notifier_fn;
	register_keyboard_notifier(&nb);
	return 0;
}

static void __exit mm_remove(void)
{
	input_unregister_device(jerry);
	remove_proc_entry(PROC_FILE_NAME,NULL);
	unregister_keyboard_notifier(&nb);
}

MODULE_LICENSE("GPL"); 
module_init(mm_init);
module_exit(mm_remove);