chassis-psu: New Functions for MultiChassis App
Implemented several functions for monitoring power supplies in
multi-chassis systems. Added a new main function, made minor
modification to the PowerSupply class, and added several functions to
the Chassis and ChassisManager classes.
The following is a summary of each object class new addition or modified
functions:
ChassisManager:
- initChassisPowerMonitoring(): Loops through all the chassis in the
system and initializes power monitoring process for each chassis's
PSUs.
Chassis:
- initPowerMonitoring(): Subscribe to D-Bus power change and initialize
power monitoring.
- supportedConfigurationInterfaceAdded(): Handle addition of supported
configuration and update missing PSUs.
- psuInterfaceAdded(): Handle addition of PSUs on D-Bus.
- validatePsuConfigAndInterfacesProcessed(): Validate the PSU
configuration and reset validation timer if power is on, supported
configs and have PSUs.
- analyzeBrownout(): Analyze PSUs for a brownout failure and log error.
- syncHistory(): Toggles the GPIO to sync power supply input history
readings.
- setInputVoltageRating(): Inform each PSUs to set its PSU input.
- createError(): Create OpenBMC error.
- hasRequiredPSUs(): TODO
- updateMissingPSUs(): Update PSU inventory.
- getSupportedConfiguration(): Retrieve supported configuration from
D-BUS and matches chassis ID with the current chassis id to update
chassis configuration.
- saveChassisName(): Save chassis short name in the class.
- powerStateChanged(): Handle for power state property changes.
- attemptToCreatePowerConfigGPIO(): Attempt to create GPIO
PowerSupply:
- PowerSupply(): Added additional class constructors. The constructors
have the same parameters as the original, except that the new
constructor include an extra parameter chassis short name.
- The PowerSupply class functions implementation remains the same as
the original, except for minor change in
PowerSupply::setupInputPowerPeakSensor(), where the sensorPath was
modified to include chassis name.
Test in simulation:
- Verified supported configuration added, where it polpulates
supported properties and updates PSUs changes.
- Validated some of the brownout functionality using fault injection.
- Validated the PowerSupply class sets the appropriate input voltage
for the target chassis PSUs.
- Verified that the chassis name is included in the PSU power input
peak sensors on D-bus.
Change-Id: I75a1ab1dd004767f072e35f3ce2c83ff281eb1ca
Signed-off-by: Faisal Awada <faisal@us.ibm.com>
diff --git a/phosphor-power-supply/new_power_supply.cpp b/phosphor-power-supply/new_power_supply.cpp
new file mode 100644
index 0000000..b3ba1c7
--- /dev/null
+++ b/phosphor-power-supply/new_power_supply.cpp
@@ -0,0 +1,1346 @@
+#include "config.h"
+
+#include "new_power_supply.hpp"
+
+#include "types.hpp"
+#include "util.hpp"
+
+#include <phosphor-logging/lg2.hpp>
+#include <xyz/openbmc_project/Common/Device/error.hpp>
+
+#include <chrono> // sleep_for()
+#include <cmath>
+#include <cstdint> // uint8_t...
+#include <format>
+#include <fstream>
+#include <regex>
+#include <thread> // sleep_for()
+
+namespace phosphor::power::psu
+{
+// Amount of time in milliseconds to delay between power supply going from
+// missing to present before running the bind command(s).
+constexpr auto bindDelay = 1000;
+
+using namespace sdbusplus::xyz::openbmc_project::Common::Device::Error;
+
+PowerSupply::PowerSupply(
+ sdbusplus::bus_t& bus, const std::string& invpath, std::uint8_t i2cbus,
+ std::uint16_t i2caddr, const std::string& driver,
+ const std::string& gpioLineName, std::function<bool()>&& callback,
+ const std::string& chassisShortName) :
+ bus(bus), inventoryPath(invpath),
+ bindPath("/sys/bus/i2c/drivers/" + driver), isPowerOn(std::move(callback)),
+ driverName(driver), chassisName(chassisShortName)
+{
+ if (inventoryPath.empty())
+ {
+ throw std::invalid_argument{"Invalid empty inventoryPath"};
+ }
+
+ if (gpioLineName.empty())
+ {
+ throw std::invalid_argument{"Invalid empty gpioLineName"};
+ }
+
+ shortName = findShortName(inventoryPath);
+
+ lg2::debug("{SHORT_NAME} gpioLineName: {GPIO_LINE_NAME}", "SHORT_NAME",
+ shortName, "GPIO_LINE_NAME", gpioLineName);
+ presenceGPIO = createGPIO(gpioLineName);
+
+ 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);
+ bindDevice = busStr;
+ bindDevice.append("-");
+ bindDevice.append(addrStr);
+
+ pmbusIntf = phosphor::pmbus::createPMBus(i2cbus, addrStr);
+
+ // Get the current state of the Present property.
+ try
+ {
+ updatePresenceGPIO();
+ }
+ catch (...)
+ {
+ // If the above attempt to use the GPIO failed, it likely means that the
+ // GPIOs are in use by the kernel, meaning it is using gpio-keys.
+ // So, I should rely on phosphor-gpio-presence to update D-Bus, and
+ // work that way for power supply presence.
+ presenceGPIO = nullptr;
+ // Setup the functions to call when the D-Bus inventory path for the
+ // Present property changes.
+ presentMatch = std::make_unique<sdbusplus::bus::match_t>(
+ bus,
+ sdbusplus::bus::match::rules::propertiesChanged(inventoryPath,
+ INVENTORY_IFACE),
+ [this](auto& msg) { this->inventoryChanged(msg); });
+
+ presentAddedMatch = std::make_unique<sdbusplus::bus::match_t>(
+ bus,
+ sdbusplus::bus::match::rules::interfacesAdded() +
+ sdbusplus::bus::match::rules::argNpath(0, inventoryPath),
+ [this](auto& msg) { this->inventoryAdded(msg); });
+
+ updatePresence();
+ updateInventory();
+ setupSensors();
+ }
+ try
+ {
+ setInputVoltageRating();
+ }
+ catch (const std::exception& e)
+ {
+ lg2::info("setInputVoltageRating exception: {ERR}", "ERR", e);
+ }
+}
+
+PowerSupply::PowerSupply(
+ sdbusplus::bus_t& bus, const std::string& invpath, std::uint8_t i2cbus,
+ std::uint16_t i2caddr, const std::string& driver,
+ const std::string& gpioLineName, std::function<bool()>&& callback) :
+ PowerSupply(bus, invpath, i2cbus, i2caddr, driver, gpioLineName,
+ std::move(callback), "")
+{}
+
+void PowerSupply::bindOrUnbindDriver(bool present)
+{
+ // Symbolic link to the device will exist if the driver is bound.
+ // So exit no action required if both the link and PSU are present
+ // or neither is present.
+ namespace fs = std::filesystem;
+ fs::path path;
+ auto action = (present) ? "bind" : "unbind";
+
+ // This case should not happen, if no device driver name return.
+ if (driverName.empty())
+ {
+ lg2::info("No device driver name found");
+ return;
+ }
+ if (bindPath.string().find(driverName) != std::string::npos)
+ {
+ // bindPath has driver name
+ path = bindPath / action;
+ }
+ else
+ {
+ // Add driver name to bindPath
+ path = bindPath / driverName / action;
+ bindPath = bindPath / driverName;
+ }
+
+ if ((std::filesystem::exists(bindPath / bindDevice) && present) ||
+ (!std::filesystem::exists(bindPath / bindDevice) && !present))
+ {
+ return;
+ }
+ if (present)
+ {
+ std::this_thread::sleep_for(std::chrono::milliseconds(bindDelay));
+ lg2::info("Binding device driver. path: {PATH} device: {BIND_DEVICE}",
+ "PATH", path, "BIND_DEVICE", bindDevice);
+ }
+ else
+ {
+ lg2::info("Unbinding device driver. path: {PATH} device: {BIND_DEVICE}",
+ "PATH", path, "BIND_DEVICE", bindDevice);
+ }
+
+ std::ofstream file;
+
+ file.exceptions(std::ofstream::failbit | std::ofstream::badbit |
+ std::ofstream::eofbit);
+
+ try
+ {
+ file.open(path);
+ file << bindDevice;
+ file.close();
+ }
+ catch (const std::exception& e)
+ {
+ auto err = errno;
+
+ lg2::error("Failed binding or unbinding device. errno={ERRNO}", "ERRNO",
+ err);
+ }
+}
+
+void PowerSupply::updatePresence()
+{
+ try
+ {
+ present = getPresence(bus, inventoryPath);
+ }
+ catch (const sdbusplus::exception_t& e)
+ {
+ // Relying on property change or interface added to retry.
+ // Log an informational trace to the journal.
+ lg2::info("D-Bus property {INVENTORY_PATH} access failure exception",
+ "INVENTORY_PATH", inventoryPath);
+ }
+}
+
+void PowerSupply::updatePresenceGPIO()
+{
+ bool presentOld = present;
+
+ try
+ {
+ if (presenceGPIO->read() > 0)
+ {
+ present = true;
+ }
+ else
+ {
+ present = false;
+ }
+ }
+ catch (const std::exception& e)
+ {
+ lg2::error("presenceGPIO read fail: {ERROR}", "ERROR", e);
+ throw;
+ }
+
+ if (presentOld != present)
+ {
+ lg2::debug("{SHORT_NAME} presentOld: {PRESENT_OLD} present: {PRESENT}",
+ "SHORT_NAME", shortName, "PRESENT_OLD", presentOld,
+ "PRESENT", present);
+
+ auto invpath = inventoryPath.substr(strlen(INVENTORY_OBJ_PATH));
+
+ bindOrUnbindDriver(present);
+ if (present)
+ {
+ // If the power supply was present, then missing, and present again,
+ // the hwmon path may have changed. We will need the correct/updated
+ // path before any reads or writes are attempted.
+ pmbusIntf->findHwmonDir();
+ }
+
+ setPresence(bus, invpath, present, shortName);
+ setupSensors();
+ updateInventory();
+
+ // Need Functional to already be correct before calling this.
+ checkAvailability();
+
+ if (present)
+ {
+ onOffConfig(phosphor::pmbus::ON_OFF_CONFIG_CONTROL_PIN_ONLY);
+ clearFaults();
+ // Indicate that the input history data and timestamps between all
+ // the power supplies that are present in the system need to be
+ // synchronized.
+ syncHistoryRequired = true;
+ }
+ else
+ {
+ setSensorsNotAvailable();
+ }
+ }
+}
+
+void PowerSupply::analyzeCMLFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::CML_FAULT)
+ {
+ if (cmlFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error(
+ "{SHORT_NAME} CML fault: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_CML = {STATUS_CML}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord, "STATUS_CML",
+ lg2::hex | lg2::field8, statusCML);
+ }
+ cmlFault++;
+ }
+ }
+ else
+ {
+ cmlFault = 0;
+ }
+}
+
+void PowerSupply::analyzeInputFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::INPUT_FAULT_WARN)
+ {
+ if (inputFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error(
+ "{SHORT_NAME} INPUT fault: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_INPUT = {STATUS_INPUT}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord, "STATUS_MFR_SPECIFIC",
+ lg2::hex | lg2::field8, statusMFR, "STATUS_INPUT",
+ lg2::hex | lg2::field8, statusInput);
+ }
+ inputFault++;
+ }
+ }
+
+ // If had INPUT/VIN_UV fault, and now off.
+ // Trace that odd behavior.
+ if (inputFault &&
+ !(statusWord & phosphor::pmbus::status_word::INPUT_FAULT_WARN))
+ {
+ lg2::info(
+ "{SHORT_NAME} INPUT fault cleared: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_INPUT = {STATUS_INPUT}",
+ "SHORT_NAME", shortName, "STATUS_WORD", lg2::hex | lg2::field16,
+ statusWord, "STATUS_MFR_SPECIFIC", lg2::hex | lg2::field8,
+ statusMFR, "STATUS_INPUT", lg2::hex | lg2::field8, statusInput);
+ inputFault = 0;
+ }
+}
+
+void PowerSupply::analyzeVoutOVFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::VOUT_OV_FAULT)
+ {
+ if (voutOVFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error(
+ "{SHORT_NAME} VOUT_OV_FAULT fault: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_VOUT = {STATUS_VOUT}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord, "STATUS_MFR_SPECIFIC",
+ lg2::hex | lg2::field8, statusMFR, "STATUS_VOUT",
+ lg2::hex | lg2::field8, statusVout);
+ }
+
+ voutOVFault++;
+ }
+ }
+ else
+ {
+ voutOVFault = 0;
+ }
+}
+
+void PowerSupply::analyzeIoutOCFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::IOUT_OC_FAULT)
+ {
+ if (ioutOCFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error(
+ "{SHORT_NAME} IOUT fault: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_IOUT = {STATUS_IOUT}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord, "STATUS_MFR_SPECIFIC",
+ lg2::hex | lg2::field8, statusMFR, "STATUS_IOUT",
+ lg2::hex | lg2::field8, statusIout);
+ }
+
+ ioutOCFault++;
+ }
+ }
+ else
+ {
+ ioutOCFault = 0;
+ }
+}
+
+void PowerSupply::analyzeVoutUVFault()
+{
+ if ((statusWord & phosphor::pmbus::status_word::VOUT_FAULT) &&
+ !(statusWord & phosphor::pmbus::status_word::VOUT_OV_FAULT))
+ {
+ if (voutUVFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error(
+ "{SHORT_NAME} VOUT_UV_FAULT fault: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_VOUT = {STATUS_VOUT}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord, "STATUS_MFR_SPECIFIC",
+ lg2::hex | lg2::field8, statusMFR, "STATUS_VOUT",
+ lg2::hex | lg2::field8, statusVout);
+ }
+ voutUVFault++;
+ }
+ }
+ else
+ {
+ voutUVFault = 0;
+ }
+}
+
+void PowerSupply::analyzeFanFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::FAN_FAULT)
+ {
+ if (fanFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error("{SHORT_NAME} FANS fault/warning: "
+ "STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_FANS_1_2 = {STATUS_FANS_1_2}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord,
+ "STATUS_MFR_SPECIFIC", lg2::hex | lg2::field8,
+ statusMFR, "STATUS_FANS_1_2", lg2::hex | lg2::field8,
+ statusFans12);
+ }
+ fanFault++;
+ }
+ }
+ else
+ {
+ fanFault = 0;
+ }
+}
+
+void PowerSupply::analyzeTemperatureFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::TEMPERATURE_FAULT_WARN)
+ {
+ if (tempFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error("{SHORT_NAME} TEMPERATURE fault/warning: "
+ "STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_TEMPERATURE = {STATUS_TEMPERATURE}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord,
+ "STATUS_MFR_SPECIFIC", lg2::hex | lg2::field8,
+ statusMFR, "STATUS_TEMPERATURE",
+ lg2::hex | lg2::field8, statusTemperature);
+ }
+ tempFault++;
+ }
+ }
+ else
+ {
+ tempFault = 0;
+ }
+}
+
+void PowerSupply::analyzePgoodFault()
+{
+ if ((statusWord & phosphor::pmbus::status_word::POWER_GOOD_NEGATED) ||
+ (statusWord & phosphor::pmbus::status_word::UNIT_IS_OFF))
+ {
+ if (pgoodFault < PGOOD_DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error("{SHORT_NAME} PGOOD fault: "
+ "STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord,
+ "STATUS_MFR_SPECIFIC", lg2::hex | lg2::field8,
+ statusMFR);
+ }
+ pgoodFault++;
+ }
+ }
+ else
+ {
+ pgoodFault = 0;
+ }
+}
+
+void PowerSupply::determineMFRFault()
+{
+ if (bindPath.string().find(IBMCFFPS_DD_NAME) != std::string::npos)
+ {
+ // IBM MFR_SPECIFIC[4] is PS_Kill fault
+ if (statusMFR & 0x10)
+ {
+ if (psKillFault < DEGLITCH_LIMIT)
+ {
+ psKillFault++;
+ }
+ }
+ else
+ {
+ psKillFault = 0;
+ }
+ // IBM MFR_SPECIFIC[6] is 12Vcs fault.
+ if (statusMFR & 0x40)
+ {
+ if (ps12VcsFault < DEGLITCH_LIMIT)
+ {
+ ps12VcsFault++;
+ }
+ }
+ else
+ {
+ ps12VcsFault = 0;
+ }
+ // IBM MFR_SPECIFIC[7] is 12V Current-Share fault.
+ if (statusMFR & 0x80)
+ {
+ if (psCS12VFault < DEGLITCH_LIMIT)
+ {
+ psCS12VFault++;
+ }
+ }
+ else
+ {
+ psCS12VFault = 0;
+ }
+ }
+}
+
+void PowerSupply::analyzeMFRFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::MFR_SPECIFIC_FAULT)
+ {
+ if (mfrFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error("{SHORT_NAME} MFR fault: "
+ "STATUS_WORD = {STATUS_WORD} "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord,
+ "STATUS_MFR_SPECIFIC", lg2::hex | lg2::field8,
+ statusMFR);
+ }
+ mfrFault++;
+ }
+
+ determineMFRFault();
+ }
+ else
+ {
+ mfrFault = 0;
+ }
+}
+
+void PowerSupply::analyzeVinUVFault()
+{
+ if (statusWord & phosphor::pmbus::status_word::VIN_UV_FAULT)
+ {
+ if (vinUVFault < DEGLITCH_LIMIT)
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::error(
+ "{SHORT_NAME} VIN_UV fault: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_INPUT = {STATUS_INPUT}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord, "STATUS_MFR_SPECIFIC",
+ lg2::hex | lg2::field8, statusMFR, "STATUS_INPUT",
+ lg2::hex | lg2::field8, statusInput);
+ }
+ vinUVFault++;
+ }
+ // Remember that this PSU has seen an AC fault
+ acFault = AC_FAULT_LIMIT;
+ }
+ else
+ {
+ if (vinUVFault != 0)
+ {
+ lg2::info(
+ "{SHORT_NAME} VIN_UV fault cleared: STATUS_WORD = {STATUS_WORD}, "
+ "STATUS_MFR_SPECIFIC = {STATUS_MFR_SPECIFIC}, "
+ "STATUS_INPUT = {STATUS_INPUT}",
+ "SHORT_NAME", shortName, "STATUS_WORD", lg2::hex | lg2::field16,
+ statusWord, "STATUS_MFR_SPECIFIC", lg2::hex | lg2::field8,
+ statusMFR, "STATUS_INPUT", lg2::hex | lg2::field8, statusInput);
+ vinUVFault = 0;
+ }
+ // No AC fail, decrement counter
+ if (acFault != 0)
+ {
+ --acFault;
+ }
+ }
+}
+
+void PowerSupply::analyze()
+{
+ using namespace phosphor::pmbus;
+
+ if (presenceGPIO)
+ {
+ updatePresenceGPIO();
+ }
+
+ if (present)
+ {
+ try
+ {
+ statusWordOld = statusWord;
+ statusWord = pmbusIntf->read(STATUS_WORD, Type::Debug,
+ (readFail < LOG_LIMIT));
+ // Read worked, reset the fail count.
+ readFail = 0;
+
+ if (statusWord)
+ {
+ statusInput = pmbusIntf->read(STATUS_INPUT, Type::Debug);
+ if (bindPath.string().find(IBMCFFPS_DD_NAME) !=
+ std::string::npos)
+ {
+ statusMFR = pmbusIntf->read(STATUS_MFR, Type::Debug);
+ }
+ statusCML = pmbusIntf->read(STATUS_CML, Type::Debug);
+ auto status0Vout = pmbusIntf->insertPageNum(STATUS_VOUT, 0);
+ statusVout = pmbusIntf->read(status0Vout, Type::Debug);
+ statusIout = pmbusIntf->read(STATUS_IOUT, Type::Debug);
+ statusFans12 = pmbusIntf->read(STATUS_FANS_1_2, Type::Debug);
+ statusTemperature =
+ pmbusIntf->read(STATUS_TEMPERATURE, Type::Debug);
+
+ analyzeCMLFault();
+
+ analyzeInputFault();
+
+ analyzeVoutOVFault();
+
+ analyzeIoutOCFault();
+
+ analyzeVoutUVFault();
+
+ analyzeFanFault();
+
+ analyzeTemperatureFault();
+
+ analyzePgoodFault();
+
+ analyzeMFRFault();
+
+ analyzeVinUVFault();
+ }
+ else
+ {
+ if (statusWord != statusWordOld)
+ {
+ lg2::info("{SHORT_NAME} STATUS_WORD = {STATUS_WORD}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord);
+ }
+
+ // if INPUT/VIN_UV fault was on, it cleared, trace it.
+ if (inputFault)
+ {
+ lg2::info(
+ "{SHORT_NAME} INPUT fault cleared: STATUS_WORD = {STATUS_WORD}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord);
+ }
+
+ if (vinUVFault)
+ {
+ lg2::info(
+ "{SHORT_NAME} VIN_UV cleared: STATUS_WORD = {STATUS_WORD}",
+ "SHORT_NAME", shortName, "STATUS_WORD",
+ lg2::hex | lg2::field16, statusWord);
+ }
+
+ if (pgoodFault > 0)
+ {
+ lg2::info("{SHORT_NAME} pgoodFault cleared", "SHORT_NAME",
+ shortName);
+ }
+
+ clearFaultFlags();
+ // No AC fail, decrement counter
+ if (acFault != 0)
+ {
+ --acFault;
+ }
+ }
+
+ // Save off old inputVoltage value.
+ // Get latest inputVoltage.
+ // If voltage went from below minimum, and now is not, clear faults.
+ // Note: getInputVoltage() has its own try/catch.
+ int inputVoltageOld = inputVoltage;
+ double actualInputVoltageOld = actualInputVoltage;
+ getInputVoltage(actualInputVoltage, inputVoltage);
+ if ((inputVoltageOld == in_input::VIN_VOLTAGE_0) &&
+ (inputVoltage != in_input::VIN_VOLTAGE_0))
+ {
+ lg2::info(
+ "{SHORT_NAME} READ_VIN back in range: actualInputVoltageOld = {ACTUAL_INPUT_VOLTAGE_OLD} "
+ "actualInputVoltage = {ACTUAL_INPUT_VOLTAGE}",
+ "SHORT_NAME", shortName, "ACTUAL_INPUT_VOLTAGE_OLD",
+ actualInputVoltageOld, "ACTUAL_INPUT_VOLTAGE",
+ actualInputVoltage);
+ clearVinUVFault();
+ }
+ else if (vinUVFault && (inputVoltage != in_input::VIN_VOLTAGE_0))
+ {
+ lg2::info(
+ "{SHORT_NAME} CLEAR_FAULTS: vinUVFault {VIN_UV_FAULT} actualInputVoltage {ACTUAL_INPUT_VOLTAGE}",
+ "SHORT_NAME", shortName, "VIN_UV_FAULT", vinUVFault,
+ "ACTUAL_INPUT_VOLTAGE", actualInputVoltage);
+ // Do we have a VIN_UV fault latched that can now be cleared
+ // due to voltage back in range? Attempt to clear the
+ // fault(s), re-check faults on next call.
+ clearVinUVFault();
+ }
+ else if (std::abs(actualInputVoltageOld - actualInputVoltage) >
+ 10.0)
+ {
+ lg2::info(
+ "{SHORT_NAME} actualInputVoltageOld = {ACTUAL_INPUT_VOLTAGE_OLD} actualInputVoltage = {ACTUAL_INPUT_VOLTAGE}",
+ "SHORT_NAME", shortName, "ACTUAL_INPUT_VOLTAGE_OLD",
+ actualInputVoltageOld, "ACTUAL_INPUT_VOLTAGE",
+ actualInputVoltage);
+ }
+
+ monitorSensors();
+
+ checkAvailability();
+ }
+ catch (const ReadFailure& e)
+ {
+ if (readFail < SIZE_MAX)
+ {
+ readFail++;
+ }
+ if (readFail == LOG_LIMIT)
+ {
+ phosphor::logging::commit<ReadFailure>();
+ }
+ }
+ }
+}
+
+void PowerSupply::onOffConfig(uint8_t data)
+{
+ using namespace phosphor::pmbus;
+
+ if (present && driverName != ACBEL_FSG032_DD_NAME)
+ {
+ lg2::info("ON_OFF_CONFIG write: DATA={DATA}", "DATA",
+ lg2::hex | lg2::field8, data);
+ try
+ {
+ std::vector<uint8_t> configData{data};
+ pmbusIntf->writeBinary(ON_OFF_CONFIG, configData,
+ Type::HwmonDeviceDebug);
+ }
+ catch (...)
+ {
+ // The underlying code in writeBinary will log a message to the
+ // journal if the write fails. If the ON_OFF_CONFIG is not setup
+ // as desired, later fault detection and analysis code should
+ // catch any of the fall out. We should not need to terminate
+ // the application if this write fails.
+ }
+ }
+}
+
+void PowerSupply::clearVinUVFault()
+{
+ // Read in1_lcrit_alarm to clear bits 3 and 4 of STATUS_INPUT.
+ // The fault bits in STAUTS_INPUT roll-up to STATUS_WORD. Clearing those
+ // bits in STATUS_INPUT should result in the corresponding STATUS_WORD bits
+ // also clearing.
+ //
+ // Do not care about return value. Should be 1 if active, 0 if not.
+ if (driverName != ACBEL_FSG032_DD_NAME)
+ {
+ static_cast<void>(
+ pmbusIntf->read("in1_lcrit_alarm", phosphor::pmbus::Type::Hwmon));
+ }
+ else
+ {
+ static_cast<void>(
+ pmbusIntf->read("curr1_crit_alarm", phosphor::pmbus::Type::Hwmon));
+ }
+ vinUVFault = 0;
+}
+
+void PowerSupply::clearFaults()
+{
+ lg2::debug("clearFaults() inventoryPath: {INVENTORY_PATH}",
+ "INVENTORY_PATH", inventoryPath);
+ faultLogged = false;
+ // The PMBus device driver does not allow for writing CLEAR_FAULTS
+ // directly. However, the pmbus hwmon device driver code will send a
+ // CLEAR_FAULTS after reading from any of the hwmon "files" in sysfs, so
+ // reading in1_input should result in clearing the fault bits in
+ // STATUS_BYTE/STATUS_WORD.
+ // I do not care what the return value is.
+ if (present)
+ {
+ clearFaultFlags();
+ checkAvailability();
+ readFail = 0;
+
+ try
+ {
+ clearVinUVFault();
+ static_cast<void>(
+ pmbusIntf->read("in1_input", phosphor::pmbus::Type::Hwmon));
+ }
+ catch (const ReadFailure& e)
+ {
+ // Since I do not care what the return value is, I really do not
+ // care much if it gets a ReadFailure either. However, this
+ // should not prevent the application from continuing to run, so
+ // catching the read failure.
+ }
+ }
+}
+
+void PowerSupply::inventoryChanged(sdbusplus::message_t& msg)
+{
+ std::string msgSensor;
+ std::map<std::string, std::variant<uint32_t, bool>> msgData;
+ msg.read(msgSensor, msgData);
+
+ // Check if it was the Present property that changed.
+ auto valPropMap = msgData.find(PRESENT_PROP);
+ if (valPropMap != msgData.end())
+ {
+ if (std::get<bool>(valPropMap->second))
+ {
+ present = true;
+ // TODO: Immediately trying to read or write the "files" causes
+ // read or write failures.
+ using namespace std::chrono_literals;
+ std::this_thread::sleep_for(20ms);
+ pmbusIntf->findHwmonDir();
+ onOffConfig(phosphor::pmbus::ON_OFF_CONFIG_CONTROL_PIN_ONLY);
+ clearFaults();
+ updateInventory();
+ }
+ else
+ {
+ present = false;
+
+ // Clear out the now outdated inventory properties
+ updateInventory();
+ }
+ checkAvailability();
+ }
+}
+
+void PowerSupply::inventoryAdded(sdbusplus::message_t& msg)
+{
+ sdbusplus::message::object_path path;
+ msg.read(path);
+ // Make sure the signal is for the PSU inventory path
+ if (path == inventoryPath)
+ {
+ std::map<std::string, std::map<std::string, std::variant<bool>>>
+ interfaces;
+ // Get map of interfaces and their properties
+ msg.read(interfaces);
+
+ auto properties = interfaces.find(INVENTORY_IFACE);
+ if (properties != interfaces.end())
+ {
+ auto property = properties->second.find(PRESENT_PROP);
+ if (property != properties->second.end())
+ {
+ present = std::get<bool>(property->second);
+
+ lg2::info("Power Supply {INVENTORY_PATH} Present {PRESENT}",
+ "INVENTORY_PATH", inventoryPath, "PRESENT", present);
+
+ updateInventory();
+ checkAvailability();
+ }
+ }
+ }
+}
+
+auto PowerSupply::readVPDValue(const std::string& vpdName,
+ const phosphor::pmbus::Type& type,
+ const std::size_t& vpdSize)
+{
+ std::string vpdValue;
+ const std::regex illegalVPDRegex =
+ std::regex("[^[:alnum:]]", std::regex::basic);
+
+ try
+ {
+ vpdValue = pmbusIntf->readString(vpdName, type);
+ }
+ catch (const ReadFailure& e)
+ {
+ // Ignore the read failure, let pmbus code indicate failure,
+ // path...
+ // TODO - ibm918
+ // https://github.com/openbmc/docs/blob/master/designs/vpd-collection.md
+ // The BMC must log errors if any of the VPD cannot be properly
+ // parsed or fails ECC checks.
+ }
+
+ if (vpdValue.size() != vpdSize)
+ {
+ lg2::info("{SHORT_NAME} {VPD_NAME} resize needed. size: {SIZE}",
+ "SHORT_NAME", shortName, "VPD_NAME", vpdName, "SIZE",
+ vpdValue.size());
+ vpdValue.resize(vpdSize, ' ');
+ }
+
+ // Replace any illegal values with space(s).
+ std::regex_replace(vpdValue.begin(), vpdValue.begin(), vpdValue.end(),
+ illegalVPDRegex, " ");
+
+ return vpdValue;
+}
+
+void PowerSupply::updateInventory()
+{
+ using namespace phosphor::pmbus;
+
+#if IBM_VPD
+ std::string pn;
+ std::string fn;
+ std::string header;
+ std::string sn;
+ // The IBM power supply splits the full serial number into two parts.
+ // Each part is 6 bytes long, which should match up with SN_KW_SIZE.
+ const auto HEADER_SIZE = 6;
+ const auto SERIAL_SIZE = 6;
+ // The IBM PSU firmware version size is a bit complicated. It was originally
+ // 1-byte, per command. It was later expanded to 2-bytes per command, then
+ // up to 8-bytes per command. The device driver only reads up to 2 bytes per
+ // command, but combines all three of the 2-byte reads, or all 4 of the
+ // 1-byte reads into one string. So, the maximum size expected is 6 bytes.
+ // However, it is formatted by the driver as a hex string with two ASCII
+ // characters per byte. So the maximum ASCII string size is 12.
+ const auto IBMCFFPS_FW_VERSION_SIZE = 12;
+ const auto ACBEL_FSG032_FW_VERSION_SIZE = 6;
+
+ using PropertyMap =
+ std::map<std::string,
+ std::variant<std::string, std::vector<uint8_t>, bool>>;
+ PropertyMap assetProps;
+ PropertyMap operProps;
+ PropertyMap versionProps;
+ PropertyMap ipzvpdDINFProps;
+ PropertyMap ipzvpdVINIProps;
+ using InterfaceMap = std::map<std::string, PropertyMap>;
+ InterfaceMap interfaces;
+ using ObjectMap = std::map<sdbusplus::message::object_path, InterfaceMap>;
+ ObjectMap object;
+#endif
+ lg2::debug("updateInventory() inventoryPath: {INVENTORY_PATH}",
+ "INVENTORY_PATH", inventoryPath);
+
+ if (present)
+ {
+ // TODO: non-IBM inventory updates?
+
+#if IBM_VPD
+ if (driverName == ACBEL_FSG032_DD_NAME)
+ {
+ getPsuVpdFromDbus("CC", modelName);
+ getPsuVpdFromDbus("PN", pn);
+ getPsuVpdFromDbus("FN", fn);
+ getPsuVpdFromDbus("SN", sn);
+ assetProps.emplace(SN_PROP, sn);
+ fwVersion = readVPDValue(FW_VERSION, Type::Debug,
+ ACBEL_FSG032_FW_VERSION_SIZE);
+ versionProps.emplace(VERSION_PROP, fwVersion);
+ }
+ else
+ {
+ modelName = readVPDValue(CCIN, Type::HwmonDeviceDebug, CC_KW_SIZE);
+ pn = readVPDValue(PART_NUMBER, Type::Debug, PN_KW_SIZE);
+ fn = readVPDValue(FRU_NUMBER, Type::Debug, FN_KW_SIZE);
+
+ header = readVPDValue(SERIAL_HEADER, Type::Debug, HEADER_SIZE);
+ sn = readVPDValue(SERIAL_NUMBER, Type::Debug, SERIAL_SIZE);
+ assetProps.emplace(SN_PROP, header + sn);
+ fwVersion = readVPDValue(FW_VERSION, Type::HwmonDeviceDebug,
+ IBMCFFPS_FW_VERSION_SIZE);
+ versionProps.emplace(VERSION_PROP, fwVersion);
+ }
+
+ assetProps.emplace(MODEL_PROP, modelName);
+ assetProps.emplace(PN_PROP, pn);
+ assetProps.emplace(SPARE_PN_PROP, fn);
+
+ ipzvpdVINIProps.emplace(
+ "CC", std::vector<uint8_t>(modelName.begin(), modelName.end()));
+ ipzvpdVINIProps.emplace("PN",
+ std::vector<uint8_t>(pn.begin(), pn.end()));
+ ipzvpdVINIProps.emplace("FN",
+ std::vector<uint8_t>(fn.begin(), fn.end()));
+ std::string header_sn = header + sn;
+ ipzvpdVINIProps.emplace(
+ "SN", std::vector<uint8_t>(header_sn.begin(), header_sn.end()));
+ std::string description = "IBM PS";
+ ipzvpdVINIProps.emplace(
+ "DR", std::vector<uint8_t>(description.begin(), description.end()));
+
+ // Populate the VINI Resource Type (RT) keyword
+ ipzvpdVINIProps.emplace("RT", std::vector<uint8_t>{'V', 'I', 'N', 'I'});
+
+ // Update the Resource Identifier (RI) keyword
+ // 2 byte FRC: 0x0003
+ // 2 byte RID: 0x1000, 0x1001...
+ std::uint8_t num = std::stoul(
+ inventoryPath.substr(inventoryPath.size() - 1, 1), nullptr, 0);
+ std::vector<uint8_t> ri{0x00, 0x03, 0x10, num};
+ ipzvpdDINFProps.emplace("RI", ri);
+
+ // Fill in the FRU Label (FL) keyword.
+ std::string fl = "E";
+ fl.push_back(inventoryPath.back());
+ fl.resize(FL_KW_SIZE, ' ');
+ ipzvpdDINFProps.emplace("FL",
+ std::vector<uint8_t>(fl.begin(), fl.end()));
+
+ // Populate the DINF Resource Type (RT) keyword
+ ipzvpdDINFProps.emplace("RT", std::vector<uint8_t>{'D', 'I', 'N', 'F'});
+
+ interfaces.emplace(ASSET_IFACE, std::move(assetProps));
+ interfaces.emplace(VERSION_IFACE, std::move(versionProps));
+ interfaces.emplace(DINF_IFACE, std::move(ipzvpdDINFProps));
+ interfaces.emplace(VINI_IFACE, std::move(ipzvpdVINIProps));
+
+ // Update the Functional
+ operProps.emplace(FUNCTIONAL_PROP, present);
+ interfaces.emplace(OPERATIONAL_STATE_IFACE, std::move(operProps));
+
+ auto path = inventoryPath.substr(strlen(INVENTORY_OBJ_PATH));
+ object.emplace(path, std::move(interfaces));
+
+ try
+ {
+ auto service =
+ util::getService(INVENTORY_OBJ_PATH, INVENTORY_MGR_IFACE, bus);
+
+ if (service.empty())
+ {
+ lg2::error("Unable to get inventory manager service");
+ return;
+ }
+
+ auto method =
+ bus.new_method_call(service.c_str(), INVENTORY_OBJ_PATH,
+ INVENTORY_MGR_IFACE, "Notify");
+
+ method.append(std::move(object));
+
+ auto reply = bus.call(method);
+ }
+ catch (const std::exception& e)
+ {
+ lg2::error(
+ "Exception in updateInventory(): {ERROR}, PATH={INVENTORY_PATH}",
+ "ERROR", e, "INVENTORY_PATH", inventoryPath);
+ }
+#endif
+ }
+}
+
+auto PowerSupply::getMaxPowerOut() const
+{
+ using namespace phosphor::pmbus;
+
+ auto maxPowerOut = 0;
+
+ if (present)
+ {
+ try
+ {
+ // Read max_power_out, should be direct format
+ auto maxPowerOutStr =
+ pmbusIntf->readString(MFR_POUT_MAX, Type::HwmonDeviceDebug);
+ lg2::info("{SHORT_NAME} MFR_POUT_MAX read {MAX_POWER_OUT_STR}",
+ "SHORT_NAME", shortName, "MAX_POWER_OUT_STR",
+ maxPowerOutStr);
+ maxPowerOut = std::stod(maxPowerOutStr);
+ }
+ catch (const std::exception& e)
+ {
+ lg2::error("{SHORT_NAME} MFR_POUT_MAX read error: {ERROR}",
+ "SHORT_NAME", shortName, "ERROR", e);
+ }
+ }
+
+ return maxPowerOut;
+}
+
+void PowerSupply::setupSensors()
+{
+ setupInputPowerPeakSensor();
+}
+
+void PowerSupply::setupInputPowerPeakSensor()
+{
+ if (peakInputPowerSensor || !present ||
+ (bindPath.string().find(IBMCFFPS_DD_NAME) == std::string::npos))
+ {
+ return;
+ }
+
+ // This PSU has problems with the input_history command
+ if (getMaxPowerOut() == phosphor::pmbus::IBM_CFFPS_1400W)
+ {
+ return;
+ }
+
+ auto sensorPath = std::format(
+ "/xyz/openbmc_project/sensors/power/{}_ps{}_input_power_peak",
+ chassisName, shortName.back());
+ peakInputPowerSensor = std::make_unique<PowerSensorObject>(
+ bus, sensorPath.c_str(), PowerSensorObject::action::defer_emit);
+
+ // The others can remain at the defaults.
+ peakInputPowerSensor->functional(true, true);
+ peakInputPowerSensor->available(true, true);
+ peakInputPowerSensor->value(0, true);
+ peakInputPowerSensor->unit(
+ sdbusplus::xyz::openbmc_project::Sensor::server::Value::Unit::Watts,
+ true);
+
+ auto associations = getSensorAssociations();
+ peakInputPowerSensor->associations(associations, true);
+
+ peakInputPowerSensor->emit_object_added();
+}
+
+void PowerSupply::setSensorsNotAvailable()
+{
+ if (peakInputPowerSensor)
+ {
+ peakInputPowerSensor->value(std::numeric_limits<double>::quiet_NaN());
+ peakInputPowerSensor->available(false);
+ }
+}
+
+void PowerSupply::monitorSensors()
+{
+ monitorPeakInputPowerSensor();
+}
+
+void PowerSupply::monitorPeakInputPowerSensor()
+{
+ if (!peakInputPowerSensor)
+ {
+ return;
+ }
+
+ constexpr size_t recordSize = 5;
+ std::vector<uint8_t> data;
+
+ // Get the peak input power with input history command.
+ // New data only shows up every 30s, but just try to read it every 1s
+ // anyway so we always have the most up to date value.
+ try
+ {
+ data = pmbusIntf->readBinary(INPUT_HISTORY,
+ pmbus::Type::HwmonDeviceDebug, recordSize);
+ }
+ catch (const ReadFailure& e)
+ {
+ peakInputPowerSensor->value(std::numeric_limits<double>::quiet_NaN());
+ peakInputPowerSensor->functional(false);
+ throw;
+ }
+
+ if (data.size() != recordSize)
+ {
+ lg2::debug(
+ "Input history command returned {DATA_SIZE} bytes instead of 5",
+ "DATA_SIZE", data.size());
+ peakInputPowerSensor->value(std::numeric_limits<double>::quiet_NaN());
+ peakInputPowerSensor->functional(false);
+ return;
+ }
+
+ // The format is SSAAAAPPPP:
+ // SS = packet sequence number
+ // AAAA = average power (linear format, little endian)
+ // PPPP = peak power (linear format, little endian)
+ auto peak = static_cast<uint16_t>(data[4]) << 8 | data[3];
+ auto peakPower = linearToInteger(peak);
+
+ peakInputPowerSensor->value(peakPower);
+ peakInputPowerSensor->functional(true);
+ peakInputPowerSensor->available(true);
+}
+
+void PowerSupply::getInputVoltage(double& actualInputVoltage,
+ int& inputVoltage) const
+{
+ using namespace phosphor::pmbus;
+
+ actualInputVoltage = in_input::VIN_VOLTAGE_0;
+ inputVoltage = in_input::VIN_VOLTAGE_0;
+
+ if (present)
+ {
+ try
+ {
+ // Read input voltage in millivolts
+ auto inputVoltageStr = pmbusIntf->readString(READ_VIN, Type::Hwmon);
+
+ // Convert to volts
+ actualInputVoltage = std::stod(inputVoltageStr) / 1000;
+
+ // Calculate the voltage based on voltage thresholds
+ if (actualInputVoltage < in_input::VIN_VOLTAGE_MIN)
+ {
+ inputVoltage = in_input::VIN_VOLTAGE_0;
+ }
+ else if (actualInputVoltage < in_input::VIN_VOLTAGE_110_THRESHOLD)
+ {
+ inputVoltage = in_input::VIN_VOLTAGE_110;
+ }
+ else
+ {
+ inputVoltage = in_input::VIN_VOLTAGE_220;
+ }
+ }
+ catch (const std::exception& e)
+ {
+ lg2::error("{SHORT_NAME} READ_VIN read error: {ERROR}",
+ "SHORT_NAME", shortName, "ERROR", e);
+ }
+ }
+}
+
+void PowerSupply::checkAvailability()
+{
+ bool origAvailability = available;
+ bool faulted = isPowerOn() && (hasPSKillFault() || hasIoutOCFault());
+ available = present && !hasInputFault() && !hasVINUVFault() && !faulted;
+
+ if (origAvailability != available)
+ {
+ auto invpath = inventoryPath.substr(strlen(INVENTORY_OBJ_PATH));
+ phosphor::power::psu::setAvailable(bus, invpath, available);
+
+ // Check if the health rollup needs to change based on the
+ // new availability value.
+ phosphor::power::psu::handleChassisHealthRollup(bus, inventoryPath,
+ !available);
+ }
+}
+
+void PowerSupply::setInputVoltageRating()
+{
+ if (!present)
+ {
+ if (inputVoltageRatingIface)
+ {
+ inputVoltageRatingIface->value(0);
+ inputVoltageRatingIface.reset();
+ }
+ return;
+ }
+
+ double inputVoltageValue{};
+ int inputVoltageRating{};
+ getInputVoltage(inputVoltageValue, inputVoltageRating);
+
+ if (!inputVoltageRatingIface)
+ {
+ auto path = std::format(
+ "/xyz/openbmc_project/sensors/voltage/ps{}_input_voltage_rating",
+ shortName.back());
+
+ inputVoltageRatingIface = std::make_unique<SensorObject>(
+ bus, path.c_str(), SensorObject::action::defer_emit);
+
+ // Leave other properties at their defaults
+ inputVoltageRatingIface->unit(SensorInterface::Unit::Volts, true);
+ inputVoltageRatingIface->value(static_cast<double>(inputVoltageRating),
+ true);
+
+ inputVoltageRatingIface->emit_object_added();
+ }
+ else
+ {
+ inputVoltageRatingIface->value(static_cast<double>(inputVoltageRating));
+ }
+}
+
+void PowerSupply::getPsuVpdFromDbus(const std::string& keyword,
+ std::string& vpdStr)
+{
+ try
+ {
+ std::vector<uint8_t> value;
+ vpdStr.clear();
+ util::getProperty(VINI_IFACE, keyword, inventoryPath,
+ INVENTORY_MGR_IFACE, bus, value);
+ for (char c : value)
+ {
+ vpdStr += c;
+ }
+ }
+ catch (const sdbusplus::exception_t& e)
+ {
+ lg2::error("Failed getProperty error: {ERROR}", "ERROR", e);
+ }
+}
+
+double PowerSupply::linearToInteger(uint16_t data)
+{
+ // The exponent is the first 5 bits, followed by 11 bits of mantissa.
+ int8_t exponent = (data & 0xF800) >> 11;
+ int16_t mantissa = (data & 0x07FF);
+
+ // If exponent's MSB on, then it's negative.
+ // Convert from two's complement.
+ if (exponent & 0x10)
+ {
+ exponent = (~exponent) & 0x1F;
+ exponent = (exponent + 1) * -1;
+ }
+
+ // If mantissa's MSB on, then it's negative.
+ // Convert from two's complement.
+ if (mantissa & 0x400)
+ {
+ mantissa = (~mantissa) & 0x07FF;
+ mantissa = (mantissa + 1) * -1;
+ }
+
+ auto value = static_cast<double>(mantissa) * pow(2, exponent);
+ return value;
+}
+
+std::vector<AssociationTuple> PowerSupply::getSensorAssociations()
+{
+ std::vector<AssociationTuple> associations;
+
+ associations.emplace_back("inventory", "sensors", inventoryPath);
+
+ auto chassis = getChassis(bus, inventoryPath);
+ associations.emplace_back("chassis", "all_sensors", std::move(chassis));
+
+ return associations;
+}
+
+} // namespace phosphor::power::psu