pseq: Add pgood fault detection to Rail class

Add power good (pgood) fault detection to the Rail class in the
phosphor-power-sequencer application.

Implement the checking defined in the JSON configuration file:
* Check for fault bits set in STATUS_VOUT
* Check for a GPIO with the wrong value
* Check if the output voltage (READ_VOUT) is below the undervoltage
  limit (VOUT_UV_FAULT_LIMIT)

If a pgood fault is detected, capture the relevant debug information
such as the rail name and STATUS_WORD value.

Tested:
* Added gtests for the new code
* Ran all gtests and verified they passed

Change-Id: I09c3ed6c504fe907a7854a4ac462a2bc4a8b806f
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
diff --git a/phosphor-power-sequencer/src/rail.cpp b/phosphor-power-sequencer/src/rail.cpp
new file mode 100644
index 0000000..7355b9a
--- /dev/null
+++ b/phosphor-power-sequencer/src/rail.cpp
@@ -0,0 +1,284 @@
+/**
+ * Copyright © 2024 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 "rail.hpp"
+
+#include "pmbus.hpp"
+
+#include <exception>
+#include <format>
+
+namespace phosphor::power::sequencer
+{
+namespace status_vout = phosphor::pmbus::status_vout;
+
+bool Rail::isPresent(Services& services)
+{
+    // Initially assume rail is present
+    bool present{true};
+
+    // If presence data member contains an inventory path to check
+    if (presence)
+    {
+        const std::string& inventoryPath = *presence;
+        try
+        {
+            present = services.isPresent(inventoryPath);
+        }
+        catch (const std::exception& e)
+        {
+            throw std::runtime_error{std::format(
+                "Unable to determine presence of rail {} using inventory path {}: {}",
+                name, inventoryPath, e.what())};
+        }
+    }
+
+    return present;
+}
+
+uint16_t Rail::getStatusWord(PowerSequencerDevice& device)
+{
+    uint16_t value{0};
+    try
+    {
+        verifyHasPage();
+        value = device.getStatusWord(*page);
+    }
+    catch (const std::exception& e)
+    {
+        throw std::runtime_error{
+            std::format("Unable to read STATUS_WORD value for rail {}: {}",
+                        name, e.what())};
+    }
+    return value;
+}
+
+uint8_t Rail::getStatusVout(PowerSequencerDevice& device)
+{
+    uint8_t value{0};
+    try
+    {
+        verifyHasPage();
+        value = device.getStatusVout(*page);
+    }
+    catch (const std::exception& e)
+    {
+        throw std::runtime_error{
+            std::format("Unable to read STATUS_VOUT value for rail {}: {}",
+                        name, e.what())};
+    }
+    return value;
+}
+
+double Rail::getReadVout(PowerSequencerDevice& device)
+{
+    double value{0.0};
+    try
+    {
+        verifyHasPage();
+        value = device.getReadVout(*page);
+    }
+    catch (const std::exception& e)
+    {
+        throw std::runtime_error{std::format(
+            "Unable to read READ_VOUT value for rail {}: {}", name, e.what())};
+    }
+    return value;
+}
+
+double Rail::getVoutUVFaultLimit(PowerSequencerDevice& device)
+{
+    double value{0.0};
+    try
+    {
+        verifyHasPage();
+        value = device.getVoutUVFaultLimit(*page);
+    }
+    catch (const std::exception& e)
+    {
+        throw std::runtime_error{std::format(
+            "Unable to read VOUT_UV_FAULT_LIMIT value for rail {}: {}", name,
+            e.what())};
+    }
+    return value;
+}
+
+bool Rail::hasPgoodFault(PowerSequencerDevice& device, Services& services,
+                         const std::vector<int>& gpioValues,
+                         std::map<std::string, std::string>& additionalData)
+{
+    // If rail is not present, return false and don't check anything else
+    if (!isPresent(services))
+    {
+        services.logInfoMsg(std::format("Rail {} is not present", name));
+        return false;
+    }
+
+    // Check if STATUS_VOUT indicates a pgood fault occurred
+    bool hasFault = hasPgoodFaultStatusVout(device, services, additionalData);
+
+    // Check if a GPIO value indicates a pgood fault occurred
+    if (!hasFault)
+    {
+        hasFault = hasPgoodFaultGPIO(services, gpioValues, additionalData);
+    }
+
+    // Check if output voltage is below UV limit indicating pgood fault occurred
+    if (!hasFault)
+    {
+        hasFault = hasPgoodFaultOutputVoltage(device, services, additionalData);
+    }
+
+    // If fault detected, store debug data in additional data map
+    if (hasFault)
+    {
+        services.logErrorMsg(
+            std::format("Pgood fault detected in rail {}", name));
+        storePgoodFaultDebugData(device, services, additionalData);
+    }
+
+    return hasFault;
+}
+
+void Rail::verifyHasPage()
+{
+    if (!page)
+    {
+        throw std::runtime_error{
+            std::format("No PAGE number defined for rail {}", name)};
+    }
+}
+
+bool Rail::hasPgoodFaultStatusVout(
+    PowerSequencerDevice& device, Services& services,
+    std::map<std::string, std::string>& additionalData)
+{
+    bool hasFault{false};
+
+    // If we are checking the value of STATUS_VOUT for the rail
+    if (checkStatusVout)
+    {
+        // Read STATUS_VOUT value from device
+        uint8_t statusVout = getStatusVout(device);
+
+        // Check if fault (non-warning) bits are set in value
+        if (statusVout & ~status_vout::WARNING_MASK)
+        {
+            hasFault = true;
+            services.logErrorMsg(std::format(
+                "Rail {} has fault bits set in STATUS_VOUT: {:#04x}", name,
+                statusVout));
+            additionalData.emplace("STATUS_VOUT",
+                                   std::format("{:#04x}", statusVout));
+        }
+        else if (statusVout != 0)
+        {
+            services.logInfoMsg(std::format(
+                "Rail {} has warning bits set in STATUS_VOUT: {:#04x}", name,
+                statusVout));
+        }
+    }
+
+    return hasFault;
+}
+
+bool Rail::hasPgoodFaultGPIO(Services& services,
+                             const std::vector<int>& gpioValues,
+                             std::map<std::string, std::string>& additionalData)
+{
+    bool hasFault{false};
+
+    // If a GPIO is defined for checking pgood status
+    if (gpio)
+    {
+        // Get GPIO value
+        unsigned int line = gpio->line;
+        bool activeLow = gpio->activeLow;
+        if (line >= gpioValues.size())
+        {
+            throw std::runtime_error{std::format(
+                "Invalid GPIO line offset {} for rail {}: Device only has {} GPIO values",
+                line, name, gpioValues.size())};
+        }
+        int value = gpioValues[line];
+
+        // Check if value indicates pgood signal is not active
+        if ((activeLow && (value == 1)) || (!activeLow && (value == 0)))
+        {
+            hasFault = true;
+            services.logErrorMsg(std::format(
+                "Rail {} pgood GPIO line offset {} has inactive value {}", name,
+                line, value));
+            additionalData.emplace("GPIO_LINE", std::format("{}", line));
+            additionalData.emplace("GPIO_VALUE", std::format("{}", value));
+        }
+    }
+
+    return hasFault;
+}
+
+bool Rail::hasPgoodFaultOutputVoltage(
+    PowerSequencerDevice& device, Services& services,
+    std::map<std::string, std::string>& additionalData)
+{
+    bool hasFault{false};
+
+    // If we are comparing output voltage to UV limit to check pgood status
+    if (compareVoltageToLimit)
+    {
+        // Read output voltage and UV fault limit values from device
+        double vout = getReadVout(device);
+        double uvLimit = getVoutUVFaultLimit(device);
+
+        // If output voltage is at or below UV fault limit
+        if (vout <= uvLimit)
+        {
+            hasFault = true;
+            services.logErrorMsg(std::format(
+                "Rail {} output voltage {}V is <= UV fault limit {}V", name,
+                vout, uvLimit));
+            additionalData.emplace("READ_VOUT", std::format("{}", vout));
+            additionalData.emplace("VOUT_UV_FAULT_LIMIT",
+                                   std::format("{}", uvLimit));
+        }
+    }
+
+    return hasFault;
+}
+
+void Rail::storePgoodFaultDebugData(
+    PowerSequencerDevice& device, Services& services,
+    std::map<std::string, std::string>& additionalData)
+{
+    additionalData.emplace("RAIL_NAME", name);
+    if (page)
+    {
+        try
+        {
+            uint16_t statusWord = getStatusWord(device);
+            services.logInfoMsg(
+                std::format("Rail {} STATUS_WORD: {:#06x}", name, statusWord));
+            additionalData.emplace("STATUS_WORD",
+                                   std::format("{:#06x}", statusWord));
+        }
+        catch (...)
+        {
+            // Ignore error; don't interrupt pgood fault handling
+        }
+    }
+}
+
+} // namespace phosphor::power::sequencer