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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/* OPL implementation for OPL2LPT through libieee1284.
*/
#define FORBIDDEN_SYMBOL_ALLOW_ALL
#include "common/scummsys.h"
#include "common/config-manager.h"
#include "common/debug.h"
#include "common/str.h"
#include "common/textconsole.h"
#include "audio/fmopl.h"
#include <unistd.h>
#include <ieee1284.h>
namespace OPL {
namespace OPL2LPT {
class OPL : public ::OPL::RealOPL {
private:
struct parport *_pport;
int index;
static const uint8 ctrlBytes[];
public:
OPL();
~OPL();
bool init();
void reset();
void write(int a, int v);
byte read(int a);
void writeReg(int r, int v);
};
const uint8 OPL::ctrlBytes[] = {
(C1284_NSELECTIN | C1284_NSTROBE | C1284_NINIT) ^ C1284_INVERTED,
(C1284_NSELECTIN | C1284_NSTROBE) ^ C1284_INVERTED,
(C1284_NSELECTIN | C1284_NSTROBE | C1284_NINIT) ^ C1284_INVERTED,
(C1284_NSELECTIN | C1284_NINIT) ^ C1284_INVERTED,
C1284_NSELECTIN ^ C1284_INVERTED,
(C1284_NSELECTIN | C1284_NINIT) ^ C1284_INVERTED
};
OPL::OPL() : _pport(nullptr) {
}
OPL::~OPL() {
if (_pport) {
stop();
reset();
ieee1284_close(_pport);
}
}
bool OPL::init() {
struct parport_list parports = {};
const Common::String parportName = ConfMan.get("opl2lpt_parport");
// Look for available parallel ports
if (ieee1284_find_ports(&parports, 0) != E1284_OK) {
return false;
}
for (int i = 0; i < parports.portc; i++) {
if (parportName == "null" ||
parportName == parports.portv[i]->name) {
int caps = CAP1284_RAW;
_pport = parports.portv[i];
if (ieee1284_open(_pport, F1284_EXCL, &caps) != E1284_OK) {
warning("cannot open parallel port %s", _pport->name);
}
if (ieee1284_claim(_pport) != E1284_OK) {
warning("cannot claim parallel port %s", _pport->name);
ieee1284_close(_pport);
continue;
}
reset();
// Safe to free ports here, opened ports are refcounted.
ieee1284_free_ports(&parports);
return true;
}
}
_pport = nullptr;
ieee1284_free_ports(&parports);
return false;
}
void OPL::reset() {
for(int i = 0; i < 256; i ++) {
writeReg(i, 0);
}
index = 0;
}
void OPL::write(int port, int val) {
if (port & 1) {
writeReg(index, val);
} else {
index = val;
}
}
byte OPL::read(int port) {
// No read support for the OPL2LPT
return 0;
}
void OPL::writeReg(int r, int v) {
r &= 0xff;
v &= 0xff;
ieee1284_write_data(_pport, r);
ieee1284_write_control(_pport, ctrlBytes[0]);
ieee1284_write_control(_pport, ctrlBytes[1]);
ieee1284_write_control(_pport, ctrlBytes[2]);
usleep(4); // 3.3 us
ieee1284_write_data(_pport, v);
ieee1284_write_control(_pport, ctrlBytes[3]);
ieee1284_write_control(_pport, ctrlBytes[4]);
ieee1284_write_control(_pport, ctrlBytes[5]);
usleep(23);
}
OPL *create() {
return new OPL();
}
} // End of namespace OPL2LPT
} // End of namespace OPL
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