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//https://wiki.osdev.org/PS/2_Mouse
//TODO: ignore last packet for 4 packets mouse?
#include <stdint.h>
#include "mouse.h"
#include "ringbuffer.h"
#include "compositor.h"
#include "interrupts.h"
#include "kernel/kernel.h"
#include "log.h"
#include "asm_x86.h"
static volatile uint8_t mouse_cycle;
static volatile uint8_t mouse_byte[3];
// data stream coming from the mouse will be waiting inside this buffer
static ringbuffer mouse_in;
// called on each interrupt (keep it small)
// just pushes mouse data into the buffer
uint32_t mouse_interrupt(uint32_t esp)
{
if(!ringbuffer_put(&mouse_in,x86_inb(0x60)))kpanic("full");
return esp;
}
// process data in buffer (return true if anything was processed)
bool mouse_worker()
{
if(ringbuffer_full(&mouse_in))
{
kpanic("mouse buffer full"); // heavy debugging
}
bool wake=false;
while(ringbuffer_has(&mouse_in)){
mouse_handler(ringbuffer_get(&mouse_in));
wake=true;
}
return wake;
}
//
void mouse_wait(uint8_t a_type) //unsigned char
{
uint32_t _time_out=100000; //unsigned int
if(a_type==0)
{
while(_time_out--) //Data
{
if((x86_inb(0x64) & 1)==1)
{
return;
}
}
return;
}
else
{
while(_time_out--) //Signal
{
if((x86_inb(0x64) & 2)==0)
{
return;
}
}
return;
}
}
static uint8_t mouse_read()
{
//Get's response from mouse
mouse_wait(0);
return x86_inb(0x60);
}
static void mouse_write(uint8_t a_write)
{
//Wait to be able to send a command
mouse_wait(1);
//Tell the mouse we are sending a command
x86_outb(0x64, 0xD4);
//Wait for the final part
mouse_wait(1);
//Finally write
x86_outb(0x60, a_write);
}
void mouse_init()
{
mouse_in=ringbuffer_init(1);// 4096 bytes ringbuffer;
uint8_t _status; //unsigned char
//Enable the auxiliary mouse device
mouse_wait(1);
x86_outb(0x64, 0xA8);
//Enable the interrupts
mouse_wait(1);
x86_outb(0x64, 0x20);
mouse_wait(0);
_status=(x86_inb(0x60) | 2);
mouse_wait(1);
x86_outb(0x64, 0x60);
mouse_wait(1);
x86_outb(0x60, _status);
//Tell the mouse to use default settings
mouse_write(0xF6);
mouse_read(); //Acknowledge
//Enable the mouse
mouse_write(0xF4);
mouse_read(); //Acknowledge
interrupt_register(INTERRUPT_MOUSE,&mouse_interrupt);
}
// called every time after the 3 bytes have been filled.
void mouse_action()
{
/* 3rd byte bits have this meaning:
*
* key 0 left button 1
* key 1 right button 2
* key 2 middle button 4
* key 3 always one! 8
*
* key 4 x-axis sign bit 16
* key 5 y-axis sign bit 32
*
* key 6 x-axis overflow 64
* key 7 y-axis overflow 128
*/
int rel_x=0;
int rel_y=0;
/* ignore overflows? or assume max? */
if(mouse_byte[0]&0x80)
{
#ifdef LOG_MOUSE_WARN
klog("x overflow");
#endif
return;
}
if(mouse_byte[0]&0x40)
{
#ifdef LOG_MOUSE_WARN
klog("y overflow");
#endif
return;
}
rel_x = mouse_byte[1] - ((mouse_byte[0] << 4) & 0x100);
rel_y = mouse_byte[2] - ((mouse_byte[0] << 3) & 0x100);
// we pass the state through
compositor_mouse_handle(rel_x,-rel_y,mouse_byte[0]);
}
void mouse_handler(uint8_t byte)//struct regs *a_r) //struct regs *a_r (not used but just there)
{
// X86_IRQ_BEGIN
switch(mouse_cycle)
{
case 0:
mouse_byte[0]=byte;
mouse_cycle++;
// this bit is ALWAYS one, otherwise we are out of sync!
if(!(mouse_byte[0]&0x8))
{
#ifdef LOG_MOUSE_WARN
klog("mouse out of sync");
#endif
mouse_cycle--;
}
break;
case 1:
mouse_byte[1]=byte;
mouse_cycle++;
break;
case 2:
mouse_byte[2]=byte;
mouse_cycle=0;
mouse_action();
break;
}
// X86_IRQ_END
}
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