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/**
* 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.
*/
#pragma once
#include <cstdint>
#include <optional>
#include <stdexcept>
#include <string>
namespace phosphor::power::sequencer
{
/**
* @struct GPIO
*
* General Purpose Input/Output (GPIO) that can be read to obtain the pgood
* status of a voltage rail.
*/
struct GPIO
{
/**
* The libgpiod line offset of the GPIO.
*/
unsigned int line{0};
/**
* Specifies whether the GPIO is active low.
*
* If true, the GPIO value 0 indicates a true pgood status. If false, the
* GPIO value 1 indicates a true pgood status.
*/
bool activeLow{false};
};
/**
* @class Rail
*
* A voltage rail that is enabled or monitored by the power sequencer device.
*/
class Rail
{
public:
// Specify which compiler-generated methods we want
Rail() = delete;
Rail(const Rail&) = delete;
Rail(Rail&&) = delete;
Rail& operator=(const Rail&) = delete;
Rail& operator=(Rail&&) = delete;
~Rail() = default;
/**
* Constructor.
*
* Throws an exception if any of the input parameters are invalid.
*
* @param name Unique name for the rail
* @param presence Optional D-Bus inventory path of a system component which
* must be present in order for the rail to be present
* @param page Optional PMBus PAGE number of the rail. Required if
* checkStatusVout or compareVoltageToLimits is true.
* @param checkStatusVout Specifies whether to check the value of the PMBus
* STATUS_VOUT command when determining the pgood
* status of the rail
* @param compareVoltageToLimits Specifies whether to compare the output
* voltage to the undervoltage and
* overvoltage limits when determining the
* pgood status of the rail
* @param gpio Optional GPIO to read to determine the pgood status of the
* rail
*/
explicit Rail(const std::string& name,
const std::optional<std::string>& presence,
const std::optional<uint8_t>& page, bool checkStatusVout,
bool compareVoltageToLimits,
const std::optional<GPIO>& gpio) :
name{name},
presence{presence}, page{page}, checkStatusVout{checkStatusVout},
compareVoltageToLimits{compareVoltageToLimits}, gpio{gpio}
{
// If checking STATUS_VOUT or output voltage, verify PAGE was specified
if ((checkStatusVout || compareVoltageToLimits) && !page.has_value())
{
throw std::invalid_argument{"PMBus PAGE is required"};
}
}
/**
* Returns the unique name for the rail.
*
* @return rail name
*/
const std::string& getName() const
{
return name;
}
/**
* Returns the D-Bus inventory path of a system component which must be
* present in order for the rail to be present.
*
* @return inventory path for presence detection
*/
const std::optional<std::string>& getPresence() const
{
return presence;
}
/**
* Returns the PMBus PAGE number of the rail.
*
* @return PAGE number for rail
*/
const std::optional<uint8_t>& getPage() const
{
return page;
}
/**
* Returns whether the value of the PMBus STATUS_VOUT command is checked
* when determining the pgood status of the rail.
*
* @return true if STATUS_VOUT is checked, false otherwise
*/
bool getCheckStatusVout() const
{
return checkStatusVout;
}
/**
* Returns whether the output voltage should be compared to the undervoltage
* and overvoltage limits when determining the pgood status of the rail.
*
* @return true if output voltage is compared to limits, false otherwise
*/
bool getCompareVoltageToLimits() const
{
return compareVoltageToLimits;
}
/**
* Returns the GPIO to read to determine the pgood status of the rail.
*
* @return GPIO
*/
const std::optional<GPIO>& getGPIO() const
{
return gpio;
}
private:
/**
* Unique name for the rail.
*/
std::string name{};
/**
* D-Bus inventory path of a system component which must be present in order
* for the rail to be present.
*
* If not specified, the rail is assumed to always be present.
*/
std::optional<std::string> presence{};
/**
* PMBus PAGE number of the rail.
*/
std::optional<uint8_t> page{};
/**
* Specifies whether to check the value of the PMBus STATUS_VOUT command
* when determining the pgood status of the rail.
*
* If one of the error bits is set in STATUS_VOUT, the rail pgood will be
* considered false.
*/
bool checkStatusVout{false};
/**
* Specifies whether to compare the output voltage to the undervoltage and
* overvoltage limits when determining the pgood status of the rail.
*
* If the output voltage is beyond those limits, the rail pgood will be
* considered false.
*
* Uses the values of the PMBus READ_VOUT, VOUT_UV_FAULT_LIMIT, and
* VOUT_OV_FAULT_LIMIT commands.
*/
bool compareVoltageToLimits{false};
/**
* GPIO to read to determine the pgood status of the rail.
*/
std::optional<GPIO> gpio{};
};
} // namespace phosphor::power::sequencer