Bochs/bochs/iodev/gameport.cc

/////////////////////////////////////////////////////////////////////////
// $Id: gameport.cc,v 1.2 2003-07-31 12:04:48 vruppert Exp $
/////////////////////////////////////////////////////////////////////////
//
//  Copyright (C) 2003  MandrakeSoft S.A.
//
//    MandrakeSoft S.A.
//    43, rue d'Aboukir
//    75002 Paris - France
//    http://www.linux-mandrake.com/
//    http://www.mandrakesoft.com/
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

//
// Standard PC gameport
//

// Define BX_PLUGGABLE in files that can be compiled into plugins.  For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE 
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE

#include "bochs.h"

#ifdef __linux__

#include <linux/joystick.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>

#endif

#define LOG_THIS theGameport->

bx_gameport_c *theGameport = NULL;

  int
libgameport_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
{
  theGameport = new bx_gameport_c ();
  bx_devices.pluginGameport = theGameport;
  BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theGameport, BX_PLUGIN_GAMEPORT);
  return(0); // Success
}

  void
libgameport_LTX_plugin_fini(void)
{
}

bx_gameport_c::bx_gameport_c(void)
{
  put("GAME");
  settype(EXTFPUIRQLOG);
}

bx_gameport_c::~bx_gameport_c(void)
{
  if (joyfd >= 0) close(joyfd);
  BX_DEBUG(("Exit."));
}


  void
bx_gameport_c::init(void)
{
  // Allocate the gameport IO address range 0x200..0x207
  for (unsigned addr=0x200; addr<0x208; addr++) {
    DEV_register_ioread_handler(this, read_handler, addr, "Gameport", 1);
    DEV_register_iowrite_handler(this, write_handler, addr, "Gameport", 1);
  }

  BX_GAMEPORT_THIS port = 0xf0;
  BX_GAMEPORT_THIS write_usec = 0;
  BX_GAMEPORT_THIS timer_x = 0;
  BX_GAMEPORT_THIS timer_y = 0;

#ifdef __linux__
  BX_GAMEPORT_THIS joyfd = open("/dev/input/js0", O_RDONLY);
  if (BX_GAMEPORT_THIS joyfd >= 0) {
    for (unsigned i=0; i<4; i++) poll_joydev();
  }
#else
  BX_GAMEPORT_THIS joyfd = -1;
#endif
}

  void
bx_gameport_c::reset(unsigned type)
{
  // nothing for now
}

  void
bx_gameport_c::poll_joydev(void)
{
#ifdef __linux__
  struct js_event e;
  fd_set joyfds;
  struct timeval tv;

  memset(&tv, 0, sizeof(tv));
  FD_ZERO(&joyfds);
  FD_SET(BX_GAMEPORT_THIS joyfd, &joyfds);
  e.type = 0;
  if (select(BX_GAMEPORT_THIS joyfd+1, &joyfds, NULL, NULL, &tv)) {
    read(BX_GAMEPORT_THIS joyfd, &e, sizeof(struct js_event));
    if (e.type & JS_EVENT_BUTTON) {
      if (e.value == 1) {
        BX_GAMEPORT_THIS port &= ~(0x10 << e.number);
      } else {
        BX_GAMEPORT_THIS port |= (0x10 << e.number);
      }
    }
    if (e.type & JS_EVENT_AXIS) {
      if (e.number == 0) {
        BX_GAMEPORT_THIS delay_x = 25 + ((e.value + 0x8000) / 60);
      }
      if (e.number == 1) {
        BX_GAMEPORT_THIS delay_y = 25 + ((e.value + 0x8000) / 62);
      }
    }
  }
#endif
}


  // static IO port read callback handler
  // redirects to non-static class handler to avoid virtual functions

  Bit32u
bx_gameport_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
{
#if !BX_USE_GAME_SMF
  bx_gameport_c *class_ptr = (bx_gameport_c *) this_ptr;

  return( class_ptr->read(address, io_len) );
}


  Bit32u
bx_gameport_c::read(Bit32u address, unsigned io_len)
{
#else
  UNUSED(this_ptr);
#endif // !BX_USE_GAME_SMF
  Bit64u usec;

  if (BX_GAMEPORT_THIS joyfd >= 0) {
    poll_joydev();
    usec = bx_pc_system.time_usec();
    if (BX_GAMEPORT_THIS timer_x) {
      if ((usec - BX_GAMEPORT_THIS write_usec) >= BX_GAMEPORT_THIS delay_x) {
        BX_GAMEPORT_THIS port &= 0xfe;
        BX_GAMEPORT_THIS timer_x = 0;
      }
    }
    if (BX_GAMEPORT_THIS timer_y) {
      if ((usec - BX_GAMEPORT_THIS write_usec) >= BX_GAMEPORT_THIS delay_y) {
        BX_GAMEPORT_THIS port &= 0xfd;
        BX_GAMEPORT_THIS timer_y = 0;
      }
    }
  } else {
    BX_INFO(("read: joystick not present"));
  }
  return BX_GAMEPORT_THIS port;
}


  // static IO port write callback handler
  // redirects to non-static class handler to avoid virtual functions

  void
bx_gameport_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
{
#if !BX_USE_GAME_SMF
  bx_gameport_c *class_ptr = (bx_gameport_c *) this_ptr;

  class_ptr->write(address, value, io_len);
}

  void
bx_gameport_c::write(Bit32u address, Bit32u value, unsigned io_len)
{
#else
  UNUSED(this_ptr);
#endif // !BX_USE_GAME_SMF

  BX_GAMEPORT_THIS write_usec = bx_pc_system.time_usec();
  BX_GAMEPORT_THIS timer_x = 1;
  BX_GAMEPORT_THIS timer_y = 1;
  BX_GAMEPORT_THIS port |= 0x0f;
}