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gp2xwiz-hw.cpp

/* 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.
 *
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-1-1/backends/platform/gp2xwiz/gp2xwiz-hw.cpp $
 * $Id: gp2xwiz-hw.cpp 44495 2009-09-30 16:16:53Z fingolfin $
 *
 */

/*
 * GP2X Wiz: Hardware Stuff.
 *
 */

#include "backends/platform/gp2xwiz/gp2xwiz-hw.h"

#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <unistd.h>

namespace WIZ_HW {

enum {
      VOLUME_NOCHG                  = 0,
      VOLUME_DOWN                   = 1,
      VOLUME_UP                     = 2,
      VOLUME_CHANGE_RATE            = 8,
      VOLUME_MIN                    = 0,
      VOLUME_INITIAL                = 60,
      VOLUME_MAX                    = 100
};

int volumeLevel = VOLUME_INITIAL;

void deviceInit() {
}

void deviceDeinit() {
}

void mixerMoveVolume(int direction) {
    if (volumeLevel <= 10) {
        if (direction == VOLUME_UP)   volumeLevel += VOLUME_CHANGE_RATE/2;
        if (direction == VOLUME_DOWN) volumeLevel -= VOLUME_CHANGE_RATE/2;
    } else {
        if (direction == VOLUME_UP)   volumeLevel += VOLUME_CHANGE_RATE;
        if (direction == VOLUME_DOWN) volumeLevel -= VOLUME_CHANGE_RATE;
    }

    if (volumeLevel < VOLUME_MIN) volumeLevel = VOLUME_MIN;
    if (volumeLevel > VOLUME_MAX) volumeLevel = VOLUME_MAX;

    unsigned long soundDev = open("/dev/mixer", O_RDWR);

    if (soundDev) {
        int vol = ((volumeLevel << 8) | volumeLevel);
        ioctl(soundDev, SOUND_MIXER_WRITE_PCM, &vol);
        close(soundDev);
    }
}

} /* namespace WIZ_HW */

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