RPi: Add support for I2C

Add MyHw file for RaspberryPi.

Fix compilation warnings in x86.

Fix some error messages.

drivers/Linux/SoftEeprom.cpp

@@ -0,0 +1,129 @@
+/**
+ * The MySensors Arduino library handles the wireless radio link and protocol
+ * between your home built sensors/actuators and HA controller of choice.
+ * The sensors forms a self healing radio network with optional repeaters. Each
+ * repeater and gateway builds a routing tables in EEPROM which keeps track of the
+ * network topology allowing messages to be routed to nodes.
+ *
+ * Created by Marcelo Aquino <marceloaqno@gmail.org>
+ * Copyright (C) 2016 Marcelo Aquino
+ * Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
+ *
+ * Documentation: http://www.mysensors.org
+ * Support Forum: http://forum.mysensors.org
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include <stdlib.h>
+#include <iostream>
+#include <fstream>
+#include <sys/stat.h>
+#include <string.h>
+#include "log.h"
+#include "SoftEeprom.h"
+
+SoftEeprom::SoftEeprom(const char *fileName, size_t length)
+{
+	struct stat fileInfo;
+
+	_fileName = strdup(fileName);
+	if (_fileName == NULL) {
+		perror("Error: ");
+		exit(1);
+	}
+
+	_length = length;
+	_values = new uint8_t[_length];
+	for (size_t i = 0; i < _length; ++i) {
+		_values[i] = 0xFF;
+	}
+
+	if (stat(_fileName, &fileInfo) != 0) {
+		//File does not exist.  Create it.
+		mys_log(LOG_INFO, "Config file %s does not exist, creating new config file.\n", _fileName);
+		std::ofstream myFile(_fileName, std::ios::out | std::ios::binary);
+		if (!myFile) {
+			mys_log(LOG_ERR, "Unable to create config file %s.\n", _fileName);
+			exit(1);
+		}
+		myFile.write((const char*)_values, _length);
+		myFile.close();
+	} else if (fileInfo.st_size < 0 || (size_t)fileInfo.st_size != _length) {
+		mys_log(LOG_ERR, "Config file %s is not the correct size of %zu.  Please remove the file and a new one will be created.\n", _fileName, _length);
+		exit(1);
+	} else {
+		//Read config into local memory.
+		std::ifstream myFile(_fileName, std::ios::in | std::ios::binary);
+		if (!myFile) {
+			mys_log(LOG_ERR, "Unable to open config to file %s for reading.\n", _fileName);
+			exit(1);
+		}
+		myFile.read((char*)_values, _length);
+		myFile.close();
+	}
+}
+
+SoftEeprom::~SoftEeprom()
+{
+	delete[] _values;
+	free(_fileName);
+}
+
+void SoftEeprom::readBlock(void* buf, void* addr, size_t length)
+{
+	static bool config_to_mem = false;
+	unsigned long int offs = reinterpret_cast<unsigned long int>(addr);
+
+	if (!config_to_mem) {
+		//Read config into local memory.
+		std::ifstream myFile(_fileName, std::ios::in | std::ios::binary);
+		if (!myFile) {
+			mys_log(LOG_ERR, "Unable to open config to file %s for reading.\n", _fileName);
+			exit(1);
+		}
+		myFile.read((char*)_values, _length);
+		myFile.close();
+
+		config_to_mem = true;
+	}
+
+	if (length && offs + length <= _length) {
+		memcpy(buf, _values+offs, length);
+	}
+}
+
+void SoftEeprom::writeBlock(void* buf, void* addr, size_t length)
+{
+	unsigned long int offs = reinterpret_cast<unsigned long int>(addr);
+	
+	if (length && offs + length <= _length) {
+		memcpy(_values+offs, buf, length);
+		
+		std::ofstream myFile(_fileName, std::ios::out | std::ios::in | std::ios::binary);
+		if (!myFile) {
+			mys_log(LOG_ERR, "Unable to write config to file %s.\n", _fileName);
+			return;
+		}
+		myFile.seekp(offs);
+		myFile.write((const char*)buf, length);
+		myFile.close();
+	}
+}
+
+uint8_t SoftEeprom::readByte(int addr)
+{
+	uint8_t value = 0xFF;
+	readBlock(&value, reinterpret_cast<void*>(addr), 1);
+	return value;
+}
+
+void SoftEeprom::writeByte(int addr, uint8_t value)
+{
+	uint8_t curr = readByte(addr);
+	if (curr != value) {
+		writeBlock(&value, reinterpret_cast<void*>(addr), 1);
+	}
+}