apps/window_server/PS2Mouse.cpp

   1 #include "PS2Mouse.h"
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5
   6 struct mouse_data {
   7         char status;
   8         char delta_x;
   9         char delta_y;
  10 }; // mouse_data
  11
  12 PS2Mouse::PS2Mouse(int xmax, int ymax)
  13         :       fXPos(xmax / 2),
  14                 fYPos(ymax / 2),
  15                 fXMax(xmax),
  16                 fYMax(ymax)
  17 {
  18         fFd = open("/dev/ps2mouse", 0);
  19         if(fFd < 0)
  20                 return;
  21
  22 }
  23
  24 void PS2Mouse::GetPos(int *out_x, int *out_y, int *out_buttons)
  25 {
  26         mouse_data data;
  27         int err;
  28
  29 retry:
  30         err = read(fFd, &data, sizeof(mouse_data));
  31         if(err < 0) {
  32                 usleep(1000000);
  33                 goto retry;
  34         }
  35
  36         fXPos += data.delta_x;
  37         if(fXPos < 0)
  38                 fXPos = 0;
  39         if(fXPos > fXMax)
  40                 fXPos = fXMax;
  41         *out_x = fXPos;
  42
  43         fYPos += data.delta_y;
  44         if(fYPos < 0)
  45                 fYPos = 0;
  46         if(fYPos > fYMax)
  47                 fYPos = fYMax;
  48         *out_y = fYMax - fYPos;
  49
  50         *out_buttons = 0;
  51         *out_buttons |= (data.status & 0x80) ? MAIN_BUTTON : 0;
  52         *out_buttons |= (data.status & 0x40) ? SECONDARY_BUTTON : 0;
  53         *out_buttons |= (data.status & 0x20) ? TERTIARY_BUTTON : 0;
  54
  55         return;
  56 }
  57