tools/power-utils/updater.cpp - openbmc/phosphor-power - Gitiles

 /**
  * Copyright © 2019 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 "config.h"

 #include "updater.hpp"

 #include "pmbus.hpp"
 #include "types.hpp"
 #include "utility.hpp"

 #include <sys/stat.h>

 #include <phosphor-logging/log.hpp>

 #include <chrono>
 #include <fstream>
 #include <thread>
 #include <vector>

 using namespace phosphor::logging;
 namespace util = phosphor::power::util;

 namespace updater
 {

 namespace internal
 {

 // Define the CRC-8 polynomial (CRC-8-CCITT)
 constexpr uint8_t CRC8_POLYNOMIAL = 0x07;
 constexpr uint8_t CRC8_INITIAL = 0x00;

 /* Get the device name from the device path */
 std::string getDeviceName(std::string devPath)
 {
     if (devPath.back() == '/')
     {
         devPath.pop_back();
     }
     return fs::path(devPath).stem().string();
 }

 // Construct the device path using the I2C bus and address or read inventory
 // path
 std::string getDevicePath(sdbusplus::bus_t& bus,
                           const std::string& psuInventoryPath)
 {
     try
     {
         if (internal::usePsuJsonFile())
         {
             auto data = util::loadJSONFromFile(PSU_JSON_PATH);
             if (data == nullptr)
             {
                 return {};
             }
             auto devicePath = data["psuDevices"][psuInventoryPath];
             if (devicePath.empty())
             {
                 log<level::WARNING>("Unable to find psu devices or path");
             }
             return devicePath;
         }
         else
         {
             using namespace version;
             const auto& [i2cbus, i2caddr] =
                 version::utils::getPsuI2c(bus, psuInventoryPath);
             const auto DevicePath = "/sys/bus/i2c/devices/";
             std::ostringstream ss;
             ss << std::hex << std::setw(4) << std::setfill('0') << i2caddr;
             std::string addrStr = ss.str();
             std::string busStr = std::to_string(i2cbus);
             std::string devPath = DevicePath + busStr + "-" + addrStr;
             return devPath;
         }
     }
     catch (const std::exception& e)
     {
         log<level::ERR>(
             std::format("Error in getDevicePath: {}", e.what()).c_str());
         return {};
     }
     catch (...)
     {
         log<level::ERR>("Unknown error occurred in getDevicePath");
         return {};
     }
 }

 // Parse the device name to get I2C bus and address
 std::pair<uint8_t, uint8_t> parseDeviceName(const std::string& devName)
 {
     // Get I2C bus and device address, e.g. 3-0068
     // is parsed to bus 3, device address 0x68
     auto pos = devName.find('-');
     assert(pos != std::string::npos);
     uint8_t busId = std::stoi(devName.substr(0, pos));
     uint8_t devAddr = std::stoi(devName.substr(pos + 1), nullptr, 16);
     return {busId, devAddr};
 }

 // Get the appropriate Updater class instance based PSU model number
 std::unique_ptr<updater::Updater> getClassInstance(
     const std::string& model, const std::string& psuInventoryPath,
     const std::string& devPath, const std::string& imageDir)
 {
     if (model == "XXXX")
     {
         // XXXX updater class
     }
     return std::make_unique<Updater>(psuInventoryPath, devPath, imageDir);
 }

 // Function to locate FW file with model and extension bin or hex
 const std::string getFWFilenamePath(const std::string& directory)
 {
     namespace fs = std::filesystem;
     // Get the last part of the directory name (model number)
     std::string model = fs::path(directory).filename().string();
     for (const auto& entry : fs::directory_iterator(directory))
     {
         if (entry.is_regular_file())
         {
             std::string filename = entry.path().filename().string();

             if ((filename.rfind(model, 0) == 0) &&
                 (filename.ends_with(".bin") || filename.ends_with(".hex")))
             {
                 return directory + "/" + filename;
             }
         }
     }
     return "";
 }

 // Compute CRC-8 checksum for a vector of bytes
 uint8_t calculateCRC8(const std::vector<uint8_t>& data)
 {
     uint8_t crc = CRC8_INITIAL;

     for (const auto& byte : data)
     {
         crc ^= byte;
         for (int i = 0; i < 8; ++i)
         {
             if (crc & 0x80)
                 crc = (crc << 1) ^ CRC8_POLYNOMIAL;
             else
                 crc <<= 1;
         }
     }
     return crc;
 }

 // Delay execution for a specified number of milliseconds
 void delay(const int& milliseconds)
 {
     std::this_thread::sleep_for(std::chrono::milliseconds(milliseconds));
 }

 // Convert big endian (32 bit integer) to a vector of little endian.
 std::vector<uint8_t> bigEndianToLittleEndian(const uint32_t bigEndianValue)
 {
     std::vector<uint8_t> littleEndianBytes(4);

     littleEndianBytes[3] = (bigEndianValue >> 24) & 0xFF;
     littleEndianBytes[2] = (bigEndianValue >> 16) & 0xFF;
     littleEndianBytes[1] = (bigEndianValue >> 8) & 0xFF;
     littleEndianBytes[0] = bigEndianValue & 0xFF;
     return littleEndianBytes;
 }

 // Validate the existence and size of a firmware file.
 bool validateFWFile(const std::string& fileName)
 {
     // Ensure the file exists and get the file size.
     if (!std::filesystem::exists(fileName))
     {
         log<level::ERR>(
             std::format("Firmware file not found: {}", fileName).c_str());
         return false;
     }

     // Check the file size
     auto fileSize = std::filesystem::file_size(fileName);
     if (fileSize == 0)
     {
         log<level::ERR>("Firmware file is empty");
         return false;
     }
     return true;
 }

 // Open a firmware file for reading in binary mode.
 std::unique_ptr<std::ifstream> openFirmwareFile(const std::string& fileName)
 {
     if (fileName.empty())
     {
         log<level::ERR>("Firmware file path is not provided");
         return nullptr;
     }
     auto inputFile =
         std::make_unique<std::ifstream>(fileName, std::ios::binary);
     if (!inputFile->is_open())
     {
         log<level::ERR>(
             std::format("Failed to open firmware file: {}", fileName).c_str());
         return nullptr;
     }
     return inputFile;
 }

 // Read firmware bytes from input stream.
 std::vector<uint8_t> readFirmwareBytes(std::ifstream& inputFile,
                                        const size_t numberOfBytesToRead)
 {
     std::vector<uint8_t> readDataBytes(numberOfBytesToRead, 0xFF);
     try
     {
         // Enable exceptions for failbit and badbit
         inputFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
         inputFile.read(reinterpret_cast<char*>(readDataBytes.data()),
                        numberOfBytesToRead);
         size_t bytesRead = inputFile.gcount();
         if (bytesRead != numberOfBytesToRead)
         {
             readDataBytes.resize(bytesRead);
         }
     }
     catch (const std::ios_base::failure& e)
     {
         log<level::ERR>(
             std::format("Error reading firmware: {}", e.what()).c_str());
         readDataBytes.clear();
     }
     return readDataBytes;
 }

 // Wrapper to check existence of PSU JSON file.
 bool usePsuJsonFile()
 {
     return version::utils::checkFileExists(PSU_JSON_PATH);
 }
 } // namespace internal

 bool update(sdbusplus::bus_t& bus, const std::string& psuInventoryPath,
             const std::string& imageDir)
 {
     auto devPath = internal::getDevicePath(bus, psuInventoryPath);

     if (devPath.empty())
     {
         return false;
     }

     std::filesystem::path fsPath(imageDir);

     std::unique_ptr<updater::Updater> updaterPtr = internal::getClassInstance(
         fsPath.filename().string(), psuInventoryPath, devPath, imageDir);

     if (!updaterPtr->isReadyToUpdate())
     {
         log<level::ERR>("PSU not ready to update",
                         entry("PSU=%s", psuInventoryPath.c_str()));
         return false;
     }

     updaterPtr->bindUnbind(false);
     updaterPtr->createI2CDevice();
     int ret = updaterPtr->doUpdate();
     updaterPtr->bindUnbind(true);
     return ret == 0;
 }

 Updater::Updater(const std::string& psuInventoryPath,
                  const std::string& devPath, const std::string& imageDir) :
     bus(sdbusplus::bus::new_default()), psuInventoryPath(psuInventoryPath),
     devPath(devPath), devName(internal::getDeviceName(devPath)),
     imageDir(imageDir)
 {
     fs::path p = fs::path(devPath) / "driver";
     try
     {
         driverPath =
             fs::canonical(p); // Get the path that points to the driver dir
     }
     catch (const fs::filesystem_error& e)
     {
         log<level::ERR>("Failed to get canonical path",
                         entry("DEVPATH=%s", devPath.c_str()),
                         entry("ERROR=%s", e.what()));
         throw;
     }
 }

 // During PSU update, it needs to access the PSU i2c device directly, so it
 // needs to unbind the driver during the update, and re-bind after it's done.
 // After unbind, the hwmon sysfs will be gone, and the psu-monitor will report
 // errors. So set the PSU inventory's Present property to false so that
 // psu-monitor will not report any errors.
 void Updater::bindUnbind(bool doBind)
 {
     if (!doBind)
     {
         // Set non-present before unbind the driver
         setPresent(doBind);
     }
     auto p = driverPath;
     p /= doBind ? "bind" : "unbind";
     std::ofstream out(p.string());
     out << devName;

     if (doBind)
     {
         // Set to present after bind the driver
         setPresent(doBind);
     }
 }

 void Updater::setPresent(bool present)
 {
     try
     {
         auto service = util::getService(psuInventoryPath, INVENTORY_IFACE, bus);
         util::setProperty(INVENTORY_IFACE, PRESENT_PROP, psuInventoryPath,
                           service, bus, present);
     }
     catch (const std::exception& e)
     {
         log<level::ERR>("Failed to set present property",
                         entry("PSU=%s", psuInventoryPath.c_str()),
                         entry("PRESENT=%d", present));
     }
 }

 bool Updater::isReadyToUpdate()
 {
     using namespace phosphor::pmbus;

     // Pre-condition for updating PSU:
     // * Host is powered off
     // * At least one other PSU is present
     // * All other PSUs that are present are having AC input and DC standby
     //   output

     if (util::isPoweredOn(bus, true))
     {
         log<level::WARNING>("Unable to update PSU when host is on");
         return false;
     }

     bool hasOtherPresent = false;
     auto paths = util::getPSUInventoryPaths(bus);
     for (const auto& p : paths)
     {
         if (p == psuInventoryPath)
         {
             // Skip check for itself
             continue;
         }

         // Check PSU present
         bool present = false;
         try
         {
             auto service = util::getService(p, INVENTORY_IFACE, bus);
             util::getProperty(INVENTORY_IFACE, PRESENT_PROP, psuInventoryPath,
                               service, bus, present);
         }
         catch (const std::exception& e)
         {
             log<level::ERR>("Failed to get present property",
                             entry("PSU=%s", p.c_str()));
         }
         if (!present)
         {
             log<level::WARNING>("PSU not present", entry("PSU=%s", p.c_str()));
             continue;
         }
         hasOtherPresent = true;

         // Typically the driver is still bound here, so it is possible to
         // directly read the debugfs to get the status.
         try
         {
             auto path = internal::getDevicePath(bus, p);
             PMBus pmbus(path);
             uint16_t statusWord = pmbus.read(STATUS_WORD, Type::Debug);
             auto status0Vout = pmbus.insertPageNum(STATUS_VOUT, 0);
             uint8_t voutStatus = pmbus.read(status0Vout, Type::Debug);
             if ((statusWord & status_word::VOUT_FAULT) ||
                 (statusWord & status_word::INPUT_FAULT_WARN) ||
                 (statusWord & status_word::VIN_UV_FAULT) ||
                 // For ibm-cffps PSUs, the MFR (0x80)'s OV (bit 2) and VAUX
                 // (bit 6) fault map to OV_FAULT, and UV (bit 3) fault maps to
                 // UV_FAULT in vout status.
                 (voutStatus & status_vout::UV_FAULT) ||
                 (voutStatus & status_vout::OV_FAULT))
             {
                 log<level::WARNING>(
                     "Unable to update PSU when other PSU has input/ouput fault",
                     entry("PSU=%s", p.c_str()),
                     entry("STATUS_WORD=0x%04x", statusWord),
                     entry("VOUT_BYTE=0x%02x", voutStatus));
                 return false;
             }
         }
         catch (const std::exception& ex)
         {
             // If error occurs on accessing the debugfs, it means something went
             // wrong, e.g. PSU is not present, and it's not ready to update.
             log<level::ERR>(ex.what());
             return false;
         }
     }
     return hasOtherPresent;
 }

 int Updater::doUpdate()
 {
     using namespace std::chrono;

     uint8_t data;
     uint8_t unlockData[12] = {0x45, 0x43, 0x44, 0x31, 0x36, 0x30,
                               0x33, 0x30, 0x30, 0x30, 0x34, 0x01};
     uint8_t bootFlag = 0x01;
     static_assert(sizeof(unlockData) == 12);

     i2c->write(0xf0, sizeof(unlockData), unlockData);
     printf("Unlock PSU\n");

     std::this_thread::sleep_for(milliseconds(5));

     i2c->write(0xf1, bootFlag);
     printf("Set boot flag ret\n");

     std::this_thread::sleep_for(seconds(3));

     i2c->read(0xf1, data);
     printf("Read of 0x%02x, 0x%02x\n", 0xf1, data);
     return 0;
 }

 void Updater::createI2CDevice()
 {
     auto [id, addr] = internal::parseDeviceName(devName);
     i2c = i2c::create(id, addr);
 }
 } // namespace updater
	/**
	* Copyright © 2019 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 "config.h"

	#include "updater.hpp"

	#include "pmbus.hpp"
	#include "types.hpp"
	#include "utility.hpp"

	#include <sys/stat.h>

	#include <phosphor-logging/log.hpp>

	#include <chrono>
	#include <fstream>
	#include <thread>
	#include <vector>

	using namespace phosphor::logging;
	namespace util = phosphor::power::util;

	namespace updater
	{

	namespace internal
	{

	// Define the CRC-8 polynomial (CRC-8-CCITT)
	constexpr uint8_t CRC8_POLYNOMIAL = 0x07;
	constexpr uint8_t CRC8_INITIAL = 0x00;

	/* Get the device name from the device path */
	std::string getDeviceName(std::string devPath)
	{
	if (devPath.back() == '/')
	{
	devPath.pop_back();
	}
	return fs::path(devPath).stem().string();
	}

	// Construct the device path using the I2C bus and address or read inventory
	// path
	std::string getDevicePath(sdbusplus::bus_t& bus,
	const std::string& psuInventoryPath)
	{
	try
	{
	if (internal::usePsuJsonFile())
	{
	auto data = util::loadJSONFromFile(PSU_JSON_PATH);
	if (data == nullptr)
	{
	return {};
	}
	auto devicePath = data["psuDevices"][psuInventoryPath];
	if (devicePath.empty())
	{
	log<level::WARNING>("Unable to find psu devices or path");
	}
	return devicePath;
	}
	else
	{
	using namespace version;
	const auto& [i2cbus, i2caddr] =
	version::utils::getPsuI2c(bus, psuInventoryPath);
	const auto DevicePath = "/sys/bus/i2c/devices/";
	std::ostringstream ss;
	ss << std::hex << std::setw(4) << std::setfill('0') << i2caddr;
	std::string addrStr = ss.str();
	std::string busStr = std::to_string(i2cbus);
	std::string devPath = DevicePath + busStr + "-" + addrStr;
	return devPath;
	}
	}
	catch (const std::exception& e)
	{
	log<level::ERR>(
	std::format("Error in getDevicePath: {}", e.what()).c_str());
	return {};
	}
	catch (...)
	{
	log<level::ERR>("Unknown error occurred in getDevicePath");
	return {};
	}
	}

	// Parse the device name to get I2C bus and address
	std::pair<uint8_t, uint8_t> parseDeviceName(const std::string& devName)
	{
	// Get I2C bus and device address, e.g. 3-0068
	// is parsed to bus 3, device address 0x68
	auto pos = devName.find('-');
	assert(pos != std::string::npos);
	uint8_t busId = std::stoi(devName.substr(0, pos));
	uint8_t devAddr = std::stoi(devName.substr(pos + 1), nullptr, 16);
	return {busId, devAddr};
	}

	// Get the appropriate Updater class instance based PSU model number
	std::unique_ptr<updater::Updater> getClassInstance(
	const std::string& model, const std::string& psuInventoryPath,
	const std::string& devPath, const std::string& imageDir)
	{
	if (model == "XXXX")
	{
	// XXXX updater class
	}
	return std::make_unique<Updater>(psuInventoryPath, devPath, imageDir);
	}

	// Function to locate FW file with model and extension bin or hex
	const std::string getFWFilenamePath(const std::string& directory)
	{
	namespace fs = std::filesystem;
	// Get the last part of the directory name (model number)
	std::string model = fs::path(directory).filename().string();
	for (const auto& entry : fs::directory_iterator(directory))
	{
	if (entry.is_regular_file())
	{
	std::string filename = entry.path().filename().string();

	if ((filename.rfind(model, 0) == 0) &&
	(filename.ends_with(".bin") \|\| filename.ends_with(".hex")))
	{
	return directory + "/" + filename;
	}
	}
	}
	return "";
	}

	// Compute CRC-8 checksum for a vector of bytes
	uint8_t calculateCRC8(const std::vector<uint8_t>& data)
	{
	uint8_t crc = CRC8_INITIAL;

	for (const auto& byte : data)
	{
	crc ^= byte;
	for (int i = 0; i < 8; ++i)
	{
	if (crc & 0x80)
	crc = (crc << 1) ^ CRC8_POLYNOMIAL;
	else
	crc <<= 1;
	}
	}
	return crc;
	}

	// Delay execution for a specified number of milliseconds
	void delay(const int& milliseconds)
	{
	std::this_thread::sleep_for(std::chrono::milliseconds(milliseconds));
	}

	// Convert big endian (32 bit integer) to a vector of little endian.
	std::vector<uint8_t> bigEndianToLittleEndian(const uint32_t bigEndianValue)
	{
	std::vector<uint8_t> littleEndianBytes(4);

	littleEndianBytes[3] = (bigEndianValue >> 24) & 0xFF;
	littleEndianBytes[2] = (bigEndianValue >> 16) & 0xFF;
	littleEndianBytes[1] = (bigEndianValue >> 8) & 0xFF;
	littleEndianBytes[0] = bigEndianValue & 0xFF;
	return littleEndianBytes;
	}

	// Validate the existence and size of a firmware file.
	bool validateFWFile(const std::string& fileName)
	{
	// Ensure the file exists and get the file size.
	if (!std::filesystem::exists(fileName))
	{
	log<level::ERR>(
	std::format("Firmware file not found: {}", fileName).c_str());
	return false;
	}

	// Check the file size
	auto fileSize = std::filesystem::file_size(fileName);
	if (fileSize == 0)
	{
	log<level::ERR>("Firmware file is empty");
	return false;
	}
	return true;
	}

	// Open a firmware file for reading in binary mode.
	std::unique_ptr<std::ifstream> openFirmwareFile(const std::string& fileName)
	{
	if (fileName.empty())
	{
	log<level::ERR>("Firmware file path is not provided");
	return nullptr;
	}
	auto inputFile =
	std::make_unique<std::ifstream>(fileName, std::ios::binary);
	if (!inputFile->is_open())
	{
	log<level::ERR>(
	std::format("Failed to open firmware file: {}", fileName).c_str());
	return nullptr;
	}
	return inputFile;
	}

	// Read firmware bytes from input stream.
	std::vector<uint8_t> readFirmwareBytes(std::ifstream& inputFile,
	const size_t numberOfBytesToRead)
	{
	std::vector<uint8_t> readDataBytes(numberOfBytesToRead, 0xFF);
	try
	{
	// Enable exceptions for failbit and badbit
	inputFile.exceptions(std::ifstream::failbit \| std::ifstream::badbit);
	inputFile.read(reinterpret_cast<char*>(readDataBytes.data()),
	numberOfBytesToRead);
	size_t bytesRead = inputFile.gcount();
	if (bytesRead != numberOfBytesToRead)
	{
	readDataBytes.resize(bytesRead);
	}
	}
	catch (const std::ios_base::failure& e)
	{
	log<level::ERR>(
	std::format("Error reading firmware: {}", e.what()).c_str());
	readDataBytes.clear();
	}
	return readDataBytes;
	}

	// Wrapper to check existence of PSU JSON file.
	bool usePsuJsonFile()
	{
	return version::utils::checkFileExists(PSU_JSON_PATH);
	}
	} // namespace internal

	bool update(sdbusplus::bus_t& bus, const std::string& psuInventoryPath,
	const std::string& imageDir)
	{
	auto devPath = internal::getDevicePath(bus, psuInventoryPath);

	if (devPath.empty())
	{
	return false;
	}

	std::filesystem::path fsPath(imageDir);

	std::unique_ptr<updater::Updater> updaterPtr = internal::getClassInstance(
	fsPath.filename().string(), psuInventoryPath, devPath, imageDir);

	if (!updaterPtr->isReadyToUpdate())
	{
	log<level::ERR>("PSU not ready to update",
	entry("PSU=%s", psuInventoryPath.c_str()));
	return false;
	}

	updaterPtr->bindUnbind(false);
	updaterPtr->createI2CDevice();
	int ret = updaterPtr->doUpdate();
	updaterPtr->bindUnbind(true);
	return ret == 0;
	}

	Updater::Updater(const std::string& psuInventoryPath,
	const std::string& devPath, const std::string& imageDir) :
	bus(sdbusplus::bus::new_default()), psuInventoryPath(psuInventoryPath),
	devPath(devPath), devName(internal::getDeviceName(devPath)),
	imageDir(imageDir)
	{
	fs::path p = fs::path(devPath) / "driver";
	try
	{
	driverPath =
	fs::canonical(p); // Get the path that points to the driver dir
	}
	catch (const fs::filesystem_error& e)
	{
	log<level::ERR>("Failed to get canonical path",
	entry("DEVPATH=%s", devPath.c_str()),
	entry("ERROR=%s", e.what()));
	throw;
	}
	}

	// During PSU update, it needs to access the PSU i2c device directly, so it
	// needs to unbind the driver during the update, and re-bind after it's done.
	// After unbind, the hwmon sysfs will be gone, and the psu-monitor will report
	// errors. So set the PSU inventory's Present property to false so that
	// psu-monitor will not report any errors.
	void Updater::bindUnbind(bool doBind)
	{
	if (!doBind)
	{
	// Set non-present before unbind the driver
	setPresent(doBind);
	}
	auto p = driverPath;
	p /= doBind ? "bind" : "unbind";
	std::ofstream out(p.string());
	out << devName;

	if (doBind)
	{
	// Set to present after bind the driver
	setPresent(doBind);
	}
	}

	void Updater::setPresent(bool present)
	{
	try
	{
	auto service = util::getService(psuInventoryPath, INVENTORY_IFACE, bus);
	util::setProperty(INVENTORY_IFACE, PRESENT_PROP, psuInventoryPath,
	service, bus, present);
	}
	catch (const std::exception& e)
	{
	log<level::ERR>("Failed to set present property",
	entry("PSU=%s", psuInventoryPath.c_str()),
	entry("PRESENT=%d", present));
	}
	}

	bool Updater::isReadyToUpdate()
	{
	using namespace phosphor::pmbus;

	// Pre-condition for updating PSU:
	// * Host is powered off
	// * At least one other PSU is present
	// * All other PSUs that are present are having AC input and DC standby
	// output

	if (util::isPoweredOn(bus, true))
	{
	log<level::WARNING>("Unable to update PSU when host is on");
	return false;
	}

	bool hasOtherPresent = false;
	auto paths = util::getPSUInventoryPaths(bus);
	for (const auto& p : paths)
	{
	if (p == psuInventoryPath)
	{
	// Skip check for itself
	continue;
	}

	// Check PSU present
	bool present = false;
	try
	{
	auto service = util::getService(p, INVENTORY_IFACE, bus);
	util::getProperty(INVENTORY_IFACE, PRESENT_PROP, psuInventoryPath,
	service, bus, present);
	}
	catch (const std::exception& e)
	{
	log<level::ERR>("Failed to get present property",
	entry("PSU=%s", p.c_str()));
	}
	if (!present)
	{
	log<level::WARNING>("PSU not present", entry("PSU=%s", p.c_str()));
	continue;
	}
	hasOtherPresent = true;

	// Typically the driver is still bound here, so it is possible to
	// directly read the debugfs to get the status.
	try
	{
	auto path = internal::getDevicePath(bus, p);
	PMBus pmbus(path);
	uint16_t statusWord = pmbus.read(STATUS_WORD, Type::Debug);
	auto status0Vout = pmbus.insertPageNum(STATUS_VOUT, 0);
	uint8_t voutStatus = pmbus.read(status0Vout, Type::Debug);
	if ((statusWord & status_word::VOUT_FAULT) \|\|
	(statusWord & status_word::INPUT_FAULT_WARN) \|\|
	(statusWord & status_word::VIN_UV_FAULT) \|\|
	// For ibm-cffps PSUs, the MFR (0x80)'s OV (bit 2) and VAUX
	// (bit 6) fault map to OV_FAULT, and UV (bit 3) fault maps to
	// UV_FAULT in vout status.
	(voutStatus & status_vout::UV_FAULT) \|\|
	(voutStatus & status_vout::OV_FAULT))
	{
	log<level::WARNING>(
	"Unable to update PSU when other PSU has input/ouput fault",
	entry("PSU=%s", p.c_str()),
	entry("STATUS_WORD=0x%04x", statusWord),
	entry("VOUT_BYTE=0x%02x", voutStatus));
	return false;
	}
	}
	catch (const std::exception& ex)
	{
	// If error occurs on accessing the debugfs, it means something went
	// wrong, e.g. PSU is not present, and it's not ready to update.
	log<level::ERR>(ex.what());
	return false;
	}
	}
	return hasOtherPresent;
	}

	int Updater::doUpdate()
	{
	using namespace std::chrono;

	uint8_t data;
	uint8_t unlockData[12] = {0x45, 0x43, 0x44, 0x31, 0x36, 0x30,
	0x33, 0x30, 0x30, 0x30, 0x34, 0x01};
	uint8_t bootFlag = 0x01;
	static_assert(sizeof(unlockData) == 12);

	i2c->write(0xf0, sizeof(unlockData), unlockData);
	printf("Unlock PSU\n");

	std::this_thread::sleep_for(milliseconds(5));

	i2c->write(0xf1, bootFlag);
	printf("Set boot flag ret\n");

	std::this_thread::sleep_for(seconds(3));

	i2c->read(0xf1, data);
	printf("Read of 0x%02x, 0x%02x\n", 0xf1, data);
	return 0;
	}

	void Updater::createI2CDevice()
	{
	auto [id, addr] = internal::parseDeviceName(devName);
	i2c = i2c::create(id, addr);
	}
	} // namespace updater