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/**
* Copyright 2017 Google Inc.
*
* 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 "fancontroller.hpp"
#include "tuning.hpp"
#include "util.hpp"
#include "zone.hpp"
#include <algorithm>
#include <iostream>
std::unique_ptr<PIDController>
FanController::createFanPid(ZoneInterface* owner, const std::string& id,
const std::vector<std::string>& inputs,
const ec::pidinfo& initial)
{
if (inputs.size() == 0)
{
return nullptr;
}
auto fan = std::make_unique<FanController>(id, inputs, owner);
ec::pid_info_t* info = fan->getPIDInfo();
initializePIDStruct(info, initial);
return fan;
}
double FanController::inputProc(void)
{
double value = 0;
std::vector<int64_t> values;
std::vector<int64_t>::iterator result;
try
{
for (const auto& name : _inputs)
{
value = _owner->getCachedValue(name);
/* If we have a fan we can't read, its value will be 0 for at least
* some boards, while others... the fan will drop off dbus (if
* that's how it's being read and in that case its value will never
* be updated anymore, which is relatively harmless, except, when
* something tries to read its value through IPMI, and can't, they
* sort of have to guess -- all the other fans are reporting, why
* not this one? Maybe it's unable to be read, so it's "bad."
*/
if (value > 0)
{
values.push_back(value);
}
}
}
catch (const std::exception& e)
{
std::cerr << "exception on inputProc.\n";
throw;
}
/* Reset the value from the above loop. */
value = 0;
if (values.size() > 0)
{
/* the fan PID algorithm was unstable with average, and seemed to work
* better with minimum. I had considered making this choice a variable
* in the configuration, and it's a nice-to-have..
*/
result = std::min_element(values.begin(), values.end());
value = *result;
}
return value;
}
double FanController::setptProc(void)
{
double maxRPM = _owner->getMaxSetPointRequest();
// store for reference, and check if more or less.
double prev = getSetpoint();
if (maxRPM > prev)
{
setFanDirection(FanSpeedDirection::UP);
}
else if (prev > maxRPM)
{
setFanDirection(FanSpeedDirection::DOWN);
}
else
{
setFanDirection(FanSpeedDirection::NEUTRAL);
}
setSetpoint(maxRPM);
return (maxRPM);
}
void FanController::outputProc(double value)
{
double percent = value;
/* If doing tuning, don't go into failsafe mode. */
if (!tuningEnabled)
{
if (_owner->getFailSafeMode())
{
/* In case it's being set to 100% */
if (percent < _owner->getFailSafePercent())
{
percent = _owner->getFailSafePercent();
}
}
}
// value and kFanFailSafeDutyCycle are 10 for 10% so let's fix that.
percent /= 100;
// PidSensorMap for writing.
for (const auto& it : _inputs)
{
auto sensor = _owner->getSensor(it);
sensor->write(percent);
}
return;
}
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