kernel/drivers/char/mouse/com.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <build.h>
  21 #include <system.h>
  22 #include <arch/io.h>
  23 #include <rs232.h>
  24 #include <mouse.h>
  25 #include <dev.h>
  26
  27 dev_mouse_t commouse;
  28
  29 unsigned commouse_handler ()
  30 {
  31         char b1 = rs232_read_nonblock ();
  32
  33         if ((b1 & (1 << 6)) == 0) {
  34                 commouse.pos_x = 0;
  35                 commouse.pos_y = 0;
  36                 return 0;
  37         }
  38
  39         // beginning of packet
  40         char b2 = rs232_read ();
  41         char b3 = rs232_read ();
  42
  43         commouse.pos_x = (int) (char) ((b1 << 6) | (b2 & 0x3f));
  44         commouse.pos_y = (int) (char) (((b1 << 4) & 0xc0) | (b3 & 0x3f));
  45
  46         unsigned short flags = (b1 >> 4) & 3;
  47
  48         commouse.flags = (flags == 0x2) ? MOUSE_FLAG_BUTTON1 : 0;
  49         commouse.flags |= (flags == 0x1) ? MOUSE_FLAG_BUTTON2 : 0;
  50         commouse.flags |= (flags == 0x4) ? MOUSE_FLAG_BUTTON3 : 0;
  51
  52         return 1;
  53 }
  54
  55 unsigned commouse_init ()
  56 {
  57         unsigned timeout;
  58
  59         for (timeout = 3; timeout; timeout --) {
  60                 char protocol = rs232_read_nonblock ();
  61
  62                 if (protocol == 'M')
  63                         return 1;
  64         }
  65
  66         return 0;
  67 }
  68
  69 bool commouse_acthandler (unsigned act, char *block, unsigned block_len)
  70 {
  71         switch (act) {
  72                 case DEV_ACT_INIT:
  73                 {
  74                         dev_flags_t *flags = (dev_flags_t *) block;
  75
  76                         if (!flags)
  77                                 return 0;
  78
  79                         if (block_len != sizeof (dev_flags_t))
  80                                 return 0;
  81
  82                         unsigned r = commouse_init ();
  83
  84                         if (!r)
  85                                 return 0;
  86
  87                         flags->iomem = (void *) &commouse;
  88                         flags->iolen = sizeof (dev_mouse_t);
  89
  90                         memset (flags->iomem, 0, sizeof (dev_mouse_t));
  91
  92                         return 1;
  93                 }
  94                 break;
  95                 case DEV_ACT_READ:
  96                 {
  97                         memcpy (block, &commouse, sizeof (commouse));
  98
  99                         return 1;
 100                 }
 101                 break;
 102                 case DEV_ACT_WRITE:
 103                 {
 104                         memcpy (&commouse, block, sizeof (commouse));
 105
 106                         return 1;
 107                 }
 108                 break;
 109                 case DEV_ACT_UPDATE:
 110                 {
 111                         commouse_handler ();
 112
 113                         return 1;
 114                 }
 115                 break;
 116         }
 117
 118         return 0;
 119 }