// mouse.c
// Author: Josh Holtrop
// Date: 10/03/03
// Modified: 08/02/04

#include "hos_defines.h"
#include "char/mouse.h"
#include "video/video.h"
#include "sys/io.h"

int mouse_bytesRead;
byte mouse_inbuffer[MOUSE_BUFFER_LENGTH];

//This method initializes the ps/2 mouse
void mouse_init()
{
	outportb(0x64, 0x20);		//tell keyboard controller we are going to read keyboard controller command byte
	byte temp = inportb(0x60);	//read keyboard controller command byte
	outportb(0x64, 0x60);		//tell keyboard controller we are going to write keyboard controller command byte
	outportb(0x60, 0x03 | (temp & 0x40));	//write keyboard controller command byte: enable mouse/keyboard ints, include original XLATE bit from temp (bit6)

 	outportb(0x64, 0xA8);	//enable mouse port

	outportb(0x64, 0xD4);	//send command to mouse, not kbd
	outportb(0x60, 0xF4);	//enable data reporting
	
	mouse_bytesRead = 0;

	//outportb(0x64, 0xD4);
	//outportb(0x60, 0xE7);	//scaling 2:1
}


//This method is called when a mouse interrupt occurs
void isr_mouse()
{
	byte inb = inportb(0x60);	//read mouse byte
	if ((inb == 0xFA) && (mouse_bytesRead < 1))		//ACK
		return;
	mouse_inbuffer[mouse_bytesRead] = inb;
	mouse_bytesRead++;
	if (mouse_bytesRead == 3)	//complete packet received
	{
		mouse_bytesRead = 0;
		int adjx = (char) mouse_inbuffer[1];
		int adjy = (char) mouse_inbuffer[2];
		// TODO: do something with adjx, adjy...
	}
}