pmbus.cpp - openbmc/phosphor-power - Gitiles

 /**
  * Copyright © 2017 IBM Corporation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 #include <experimental/filesystem>
 #include <fstream>
 #include <phosphor-logging/elog.hpp>
 #include <phosphor-logging/elog-errors.hpp>
 #include <xyz/openbmc_project/Common/error.hpp>
 #include <xyz/openbmc_project/Common/Device/error.hpp>
 #include "pmbus.hpp"

 namespace witherspoon
 {
 namespace pmbus
 {

 using namespace phosphor::logging;
 using namespace sdbusplus::xyz::openbmc_project::Common::Error;
 using namespace sdbusplus::xyz::openbmc_project::Common::Device::Error;
 namespace fs = std::experimental::filesystem;

 std::string PMBus::insertPageNum(const std::string& templateName,
                                  size_t page)
 {
     auto name = templateName;

     //insert the page where the P was
     auto pos = name.find('P');
     if (pos != std::string::npos)
     {
         name.replace(pos, 1, std::to_string(page));
     }

     return name;
 }

 fs::path PMBus::getPath(Type type)
 {
     switch (type)
     {
         default:
         /* fall through */
         case Type::Base:
             return basePath;
             break;
         case Type::Hwmon:
             return basePath / "hwmon" / hwmonDir;
             break;
         case Type::Debug:
             return debugPath / "pmbus" / hwmonDir;
             break;
         case Type::DeviceDebug:
         {
             auto dir = driverName + "." + std::to_string(instance);
             return debugPath / dir;
             break;
         }
         case Type::HwmonDeviceDebug:
             return debugPath / "pmbus" / hwmonDir / getDeviceName();
             break;
     }
 }

 std::string PMBus::getDeviceName()
 {
     std::string name;
     std::ifstream file;
     auto path = basePath / "name";

     file.exceptions(std::ifstream::failbit |
                     std::ifstream::badbit |
                     std::ifstream::eofbit);
     try
     {
         file.open(path);
         file >> name;
     }
     catch (std::exception& e)
     {
         log<level::ERR>("Unable to read PMBus device name",
                         entry("PATH=%s", path.c_str()));
     }

     return name;
 }

 bool PMBus::readBitInPage(const std::string& name,
                           size_t page,
                           Type type)
 {
     auto pagedBit = insertPageNum(name, page);
     return readBit(pagedBit, type);
 }

 bool PMBus::readBit(const std::string& name, Type type)
 {
     unsigned long int value = 0;
     std::ifstream file;
     fs::path path = getPath(type);

     path /= name;

     file.exceptions(std::ifstream::failbit |
                     std::ifstream::badbit |
                     std::ifstream::eofbit);

     try
     {
         char* err = NULL;
         std::string val{1, '\0'};

         file.open(path);
         file.read(&val[0], 1);

         value = strtoul(val.c_str(), &err, 10);

         if (*err)
         {
             log<level::ERR>("Invalid character in sysfs file",
                             entry("FILE=%s", path.c_str()),
                             entry("CONTENTS=%s", val.c_str()));

             //Catch below and handle as a read failure
             elog<InternalFailure>();
         }
     }
     catch (std::exception& e)
     {
         auto rc = errno;

         log<level::ERR>("Failed to read sysfs file",
                         entry("FILENAME=%s", path.c_str()));

         using metadata = xyz::openbmc_project::Common::Device::ReadFailure;

         elog<ReadFailure>(metadata::CALLOUT_ERRNO(rc),
                           metadata::CALLOUT_DEVICE_PATH(
                                   fs::canonical(basePath).c_str()));
     }

     return value != 0;
 }

 bool PMBus::exists(const std::string& name, Type type)
 {
     auto path = getPath(type);
     path /= name;
     return fs::exists(path);
 }

 uint64_t PMBus::read(const std::string& name, Type type)
 {
     uint64_t data = 0;
     std::ifstream file;
     auto path = getPath(type);
     path /= name;

     file.exceptions(std::ifstream::failbit |
                     std::ifstream::badbit |
                     std::ifstream::eofbit);

     try
     {
         file.open(path);
         file >> std::hex >> data;
     }
     catch (std::exception& e)
     {
         auto rc = errno;
         log<level::ERR>("Failed to read sysfs file",
                         entry("FILENAME=%s", path.c_str()));

         using metadata = xyz::openbmc_project::Common::Device::ReadFailure;

         elog<ReadFailure>(metadata::CALLOUT_ERRNO(rc),
                           metadata::CALLOUT_DEVICE_PATH(
                                   fs::canonical(basePath).c_str()));
     }

     return data;
 }

 std::string PMBus::readString(const std::string& name, Type type)
 {
     std::string data;
     std::ifstream file;
     auto path = getPath(type);
     path /= name;

     file.exceptions(std::ifstream::failbit |
                     std::ifstream::badbit |
                     std::ifstream::eofbit);

     try
     {
         file.open(path);
         file >> data;
     }
     catch (std::exception& e)
     {
         auto rc = errno;
         log<level::ERR>("Failed to read sysfs file",
                         entry("FILENAME=%s", path.c_str()));

         using metadata = xyz::openbmc_project::Common::Device::ReadFailure;

         elog<ReadFailure>(metadata::CALLOUT_ERRNO(rc),
                           metadata::CALLOUT_DEVICE_PATH(
                                   fs::canonical(basePath).c_str()));
     }

     return data;
 }

 void PMBus::write(const std::string& name, int value, Type type)
 {
     std::ofstream file;
     fs::path path = getPath(type);

     path /= name;

     file.exceptions(std::ofstream::failbit |
                     std::ofstream::badbit |
                     std::ofstream::eofbit);

     try
     {
         file.open(path);
         file << value;
     }
     catch (const std::exception& e)
     {
         auto rc = errno;

         log<level::ERR>("Failed to write sysfs file",
                         entry("FILENAME=%s", path.c_str()));

         using metadata = xyz::openbmc_project::Common::Device::WriteFailure;

         elog<WriteFailure>(metadata::CALLOUT_ERRNO(rc),
                            metadata::CALLOUT_DEVICE_PATH(
                                    fs::canonical(basePath).c_str()));
     }
 }

 void PMBus::findHwmonDir()
 {
     fs::path path{basePath};
     path /= "hwmon";

     // Make sure the directory exists, otherwise for things that can be
     // dynamically present or not present an exception will be thrown if the
     // hwmon directory is not there, resulting in a program termination.
     if (fs::is_directory(path))
     {
         //look for <basePath>/hwmon/hwmonN/
         for (auto& f : fs::directory_iterator(path))
         {
             if ((f.path().filename().string().find("hwmon") !=
                  std::string::npos) &&
                 (fs::is_directory(f.path())))
             {
                 hwmonDir = f.path().filename();
                 break;
             }
         }
     }

     //Don't really want to crash here, just log it
     //and let accesses fail later
     if (hwmonDir.empty())
     {
         log<level::INFO>("Unable to find hwmon directory "
                          "in device base path",
                          entry("DEVICE_PATH=%s", basePath.c_str()));
     }

 }

 }
 }
	/**
	* Copyright © 2017 IBM Corporation
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	#include <experimental/filesystem>
	#include <fstream>
	#include <phosphor-logging/elog.hpp>
	#include <phosphor-logging/elog-errors.hpp>
	#include <xyz/openbmc_project/Common/error.hpp>
	#include <xyz/openbmc_project/Common/Device/error.hpp>
	#include "pmbus.hpp"

	namespace witherspoon
	{
	namespace pmbus
	{

	using namespace phosphor::logging;
	using namespace sdbusplus::xyz::openbmc_project::Common::Error;
	using namespace sdbusplus::xyz::openbmc_project::Common::Device::Error;
	namespace fs = std::experimental::filesystem;

	std::string PMBus::insertPageNum(const std::string& templateName,
	size_t page)
	{
	auto name = templateName;

	//insert the page where the P was
	auto pos = name.find('P');
	if (pos != std::string::npos)
	{
	name.replace(pos, 1, std::to_string(page));
	}

	return name;
	}

	fs::path PMBus::getPath(Type type)
	{
	switch (type)
	{
	default:
	/* fall through */
	case Type::Base:
	return basePath;
	break;
	case Type::Hwmon:
	return basePath / "hwmon" / hwmonDir;
	break;
	case Type::Debug:
	return debugPath / "pmbus" / hwmonDir;
	break;
	case Type::DeviceDebug:
	{
	auto dir = driverName + "." + std::to_string(instance);
	return debugPath / dir;
	break;
	}
	case Type::HwmonDeviceDebug:
	return debugPath / "pmbus" / hwmonDir / getDeviceName();
	break;
	}
	}

	std::string PMBus::getDeviceName()
	{
	std::string name;
	std::ifstream file;
	auto path = basePath / "name";

	file.exceptions(std::ifstream::failbit \|
	std::ifstream::badbit \|
	std::ifstream::eofbit);
	try
	{
	file.open(path);
	file >> name;
	}
	catch (std::exception& e)
	{
	log<level::ERR>("Unable to read PMBus device name",
	entry("PATH=%s", path.c_str()));
	}

	return name;
	}

	bool PMBus::readBitInPage(const std::string& name,
	size_t page,
	Type type)
	{
	auto pagedBit = insertPageNum(name, page);
	return readBit(pagedBit, type);
	}

	bool PMBus::readBit(const std::string& name, Type type)
	{
	unsigned long int value = 0;
	std::ifstream file;
	fs::path path = getPath(type);

	path /= name;

	file.exceptions(std::ifstream::failbit \|
	std::ifstream::badbit \|
	std::ifstream::eofbit);

	try
	{
	char* err = NULL;
	std::string val{1, '\0'};

	file.open(path);
	file.read(&val[0], 1);

	value = strtoul(val.c_str(), &err, 10);

	if (*err)
	{
	log<level::ERR>("Invalid character in sysfs file",
	entry("FILE=%s", path.c_str()),
	entry("CONTENTS=%s", val.c_str()));

	//Catch below and handle as a read failure
	elog<InternalFailure>();
	}
	}
	catch (std::exception& e)
	{
	auto rc = errno;

	log<level::ERR>("Failed to read sysfs file",
	entry("FILENAME=%s", path.c_str()));

	using metadata = xyz::openbmc_project::Common::Device::ReadFailure;

	elog<ReadFailure>(metadata::CALLOUT_ERRNO(rc),
	metadata::CALLOUT_DEVICE_PATH(
	fs::canonical(basePath).c_str()));
	}

	return value != 0;
	}

	bool PMBus::exists(const std::string& name, Type type)
	{
	auto path = getPath(type);
	path /= name;
	return fs::exists(path);
	}

	uint64_t PMBus::read(const std::string& name, Type type)
	{
	uint64_t data = 0;
	std::ifstream file;
	auto path = getPath(type);
	path /= name;

	file.exceptions(std::ifstream::failbit \|
	std::ifstream::badbit \|
	std::ifstream::eofbit);

	try
	{
	file.open(path);
	file >> std::hex >> data;
	}
	catch (std::exception& e)
	{
	auto rc = errno;
	log<level::ERR>("Failed to read sysfs file",
	entry("FILENAME=%s", path.c_str()));

	using metadata = xyz::openbmc_project::Common::Device::ReadFailure;

	elog<ReadFailure>(metadata::CALLOUT_ERRNO(rc),
	metadata::CALLOUT_DEVICE_PATH(
	fs::canonical(basePath).c_str()));
	}

	return data;
	}

	std::string PMBus::readString(const std::string& name, Type type)
	{
	std::string data;
	std::ifstream file;
	auto path = getPath(type);
	path /= name;

	file.exceptions(std::ifstream::failbit \|
	std::ifstream::badbit \|
	std::ifstream::eofbit);

	try
	{
	file.open(path);
	file >> data;
	}
	catch (std::exception& e)
	{
	auto rc = errno;
	log<level::ERR>("Failed to read sysfs file",
	entry("FILENAME=%s", path.c_str()));

	using metadata = xyz::openbmc_project::Common::Device::ReadFailure;

	elog<ReadFailure>(metadata::CALLOUT_ERRNO(rc),
	metadata::CALLOUT_DEVICE_PATH(
	fs::canonical(basePath).c_str()));
	}

	return data;
	}

	void PMBus::write(const std::string& name, int value, Type type)
	{
	std::ofstream file;
	fs::path path = getPath(type);

	path /= name;

	file.exceptions(std::ofstream::failbit \|
	std::ofstream::badbit \|
	std::ofstream::eofbit);

	try
	{
	file.open(path);
	file << value;
	}
	catch (const std::exception& e)
	{
	auto rc = errno;

	log<level::ERR>("Failed to write sysfs file",
	entry("FILENAME=%s", path.c_str()));

	using metadata = xyz::openbmc_project::Common::Device::WriteFailure;

	elog<WriteFailure>(metadata::CALLOUT_ERRNO(rc),
	metadata::CALLOUT_DEVICE_PATH(
	fs::canonical(basePath).c_str()));
	}
	}

	void PMBus::findHwmonDir()
	{
	fs::path path{basePath};
	path /= "hwmon";

	// Make sure the directory exists, otherwise for things that can be
	// dynamically present or not present an exception will be thrown if the
	// hwmon directory is not there, resulting in a program termination.
	if (fs::is_directory(path))
	{
	//look for <basePath>/hwmon/hwmonN/
	for (auto& f : fs::directory_iterator(path))
	{
	if ((f.path().filename().string().find("hwmon") !=
	std::string::npos) &&
	(fs::is_directory(f.path())))
	{
	hwmonDir = f.path().filename();
	break;
	}
	}
	}

	//Don't really want to crash here, just log it
	//and let accesses fail later
	if (hwmonDir.empty())
	{
	log<level::INFO>("Unable to find hwmon directory "
	"in device base path",
	entry("DEVICE_PATH=%s", basePath.c_str()));
	}

	}

	}
	}