// SPDX-License-Identifier: GPL-3.0-or-later

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Copyright (C) 2013 - 2024, nymea GmbH
* Copyright (C) 2024 - 2025, chargebyte austria GmbH
*
* This file is part of nymea-plugins-modbus.
*
* nymea-plugins-modbus 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 3 of the License, or
* (at your option) any later version.
*
* nymea-plugins-modbus 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 nymea-plugins-modbus. If not, see <https://www.gnu.org/licenses/>.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include "mcp23008.h"
#include "i2cport.h"
#include "extern-plugininfo.h"

extern "C" {
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <linux/i2c-dev.h>
#include <i2c/smbus.h>
}

MCP23008::MCP23008(const QString &i2cPortName, int i2cAddress, QObject *parent) :
    QObject(parent),
    m_i2cPortName(i2cPortName),
    m_i2cAddress(i2cAddress)
{

}

MCP23008::~MCP23008()
{
    m_i2cFile.close();
}

bool MCP23008::init()
{
    qCDebug(dcUniPi()) << "MCP23008: initialize I2C port" << m_i2cPortName << QString("0x%1").arg(m_i2cAddress, 0, 16);

    m_i2cFile.setFileName("/dev/" + m_i2cPortName);
    if (!m_i2cFile.exists()) {
        qCWarning(dcUniPi()) << "MCP23008: The given I2C file descriptor does not exist:" << m_i2cFile.fileName();
        return false;
    }

    if (!m_i2cFile.open(QFile::ReadWrite)) {
        qCWarning(dcUniPi()) << "MCP23008: Could not open the given I2C file descriptor:" << m_i2cFile.fileName() << m_i2cFile.errorString();
        return false;
    }
    m_fileDescriptor = m_i2cFile.handle();
    return true;

}

bool MCP23008::writeRegister(MCP23008::RegisterAddress registerAddress, uint8_t value)
{
#ifdef __arm__
    if (ioctl(m_fileDescriptor, I2C_SLAVE, m_i2cAddress) < 0) {
        qCWarning(dcUniPi()) << "MCP23008: Could not set I2C into slave mode" << m_i2cPortName << QString("0x%1").arg(m_i2cAddress, 0, 16);
        return false;
    }

    // Write command
    int length = i2c_smbus_write_byte_data(m_fileDescriptor, registerAddress, value);
    if (length < 0) {
        qCWarning(dcUniPi()) << "MCP23008: Could not sent command to I2C bus.";
        return false;
    }
    return true;
#else
    Q_UNUSED(value)
    Q_UNUSED(registerAddress)
    return false;
#endif // __arm__
}


bool MCP23008::readRegister(RegisterAddress registerAddress, uint8_t *value)
{
#ifdef __arm__
    if (ioctl(m_fileDescriptor, I2C_SLAVE, m_i2cAddress) < 0) {
        qCWarning(dcUniPi()) << "MCP23008: Could not set I2C into slave mode" << m_i2cPortName << QString("0x%1").arg(m_i2cAddress, 0, 16);
        return false;
    }

    *value = i2c_smbus_read_byte_data(m_fileDescriptor, registerAddress);
    return true;
#else
    Q_UNUSED(registerAddress)
    Q_UNUSED(value)
    return false;
#endif // __arm__
}