blob: d73148aff0ac6a0e43522c4e55538e46acb347f0 [file] [log] [blame]
/**
* 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 "drive.hpp"
#include "interfaces.hpp"
#include "sensors/pluggable.hpp"
#include "sysfs/sysfsread.hpp"
#include "sysfs/sysfswrite.hpp"
#include <iostream>
#include <memory>
#include <tuple>
using tstamp = std::chrono::high_resolution_clock::time_point;
#define DRIVE_TIME 1
#define DRIVE_GOAL 2
#define DRIVE DRIVE_TIME
#define MAX_PWM 255
static std::unique_ptr<Sensor> Create(std::string readpath,
std::string writepath)
{
return std::make_unique<PluggableSensor>(
readpath, 0, /* default the timeout to disabled */
std::make_unique<SysFsRead>(readpath),
std::make_unique<SysFsWrite>(writepath, 0, MAX_PWM));
}
int64_t getAverage(std::tuple<tstamp, int64_t, int64_t>& values)
{
return (std::get<1>(values) + std::get<2>(values)) / 2;
}
bool valueClose(int64_t value, int64_t goal)
{
#if 0
int64_t delta = 100; /* within 100 */
if (value < (goal + delta) &&
value > (goal - delta))
{
return true;
}
#endif
/* let's make sure it's below goal. */
if (value < goal)
{
return true;
}
return false;
}
static void driveGoal(int64_t& seriesCnt, int64_t setPwm, int64_t goal,
std::vector<std::tuple<tstamp, int64_t, int64_t>>& series,
std::vector<std::unique_ptr<Sensor>>& fanSensors)
{
bool reading = true;
auto& fan0 = fanSensors.at(0);
auto& fan1 = fanSensors.at(1);
fan0->write(setPwm);
fan1->write(setPwm);
while (reading)
{
bool check = false;
ReadReturn r0 = fan0->read();
ReadReturn r1 = fan1->read();
int64_t n0 = static_cast<int64_t>(r0.value);
int64_t n1 = static_cast<int64_t>(r1.value);
tstamp t1 = std::chrono::high_resolution_clock::now();
series.push_back(std::make_tuple(t1, n0, n1));
seriesCnt += 1;
int64_t avgn = (n0 + n1) / 2;
/* check last three values against goal if this is close */
check = valueClose(avgn, goal);
/* We know the last entry is within range. */
if (check && seriesCnt > 3)
{
/* n-2 values */
std::tuple<tstamp, int64_t, int64_t> nm2 = series.at(seriesCnt - 3);
/* n-1 values */
std::tuple<tstamp, int64_t, int64_t> nm1 = series.at(seriesCnt - 2);
int64_t avgnm2 = getAverage(nm2);
int64_t avgnm1 = getAverage(nm1);
int64_t together = (avgnm2 + avgnm1) / 2;
reading = !valueClose(together, goal);
if (!reading)
{
std::cerr << "finished reaching goal\n";
}
}
/* Early abort for testing. */
if (seriesCnt > 150000)
{
std::cerr << "aborting after 150000 reads.\n";
reading = false;
}
}
return;
}
static void driveTime(int64_t& seriesCnt, int64_t setPwm, int64_t goal,
std::vector<std::tuple<tstamp, int64_t, int64_t>>& series,
std::vector<std::unique_ptr<Sensor>>& fanSensors)
{
using namespace std::literals::chrono_literals;
bool reading = true;
auto& fan0 = fanSensors.at(0);
auto& fan1 = fanSensors.at(1);
auto& s0 = series.at(0);
tstamp t0 = std::get<0>(s0);
fan0->write(setPwm);
fan1->write(setPwm);
while (reading)
{
ReadReturn r0 = fan0->read();
ReadReturn r1 = fan1->read();
int64_t n0 = static_cast<int64_t>(r0.value);
int64_t n1 = static_cast<int64_t>(r1.value);
tstamp t1 = std::chrono::high_resolution_clock::now();
series.push_back(std::make_tuple(t1, n0, n1));
auto duration =
std::chrono::duration_cast<std::chrono::microseconds>(t1 - t0)
.count();
if (duration >= (20000000us).count())
{
reading = false;
}
}
return;
}
int driveMain(void)
{
/* Time series of the data, the timestamp after both are read and the
* values. */
std::vector<std::tuple<tstamp, int64_t, int64_t>> series;
int64_t seriesCnt = 0; /* in case vector count isn't constant time */
int drive = DRIVE;
/*
* The fan map:
* --> 0 | 4
* --> 1 | 5
* --> 2 | 6
* --> 3 | 7
*/
std::vector<std::string> fans = {"/sys/class/hwmon/hwmon0/fan0_input",
"/sys/class/hwmon/hwmon0/fan4_input"};
std::vector<std::string> pwms = {"/sys/class/hwmon/hwmon0/pwm0",
"/sys/class/hwmon/hwmon0/pwm4"};
std::vector<std::unique_ptr<Sensor>> fanSensors;
auto fan0 = Create(fans[0], pwms[0]);
auto fan1 = Create(fans[1], pwms[1]);
ReadReturn r0 = fan0->read();
ReadReturn r1 = fan1->read();
int64_t pwm0_value = static_cast<int64_t>(r0.value);
int64_t pwm1_value = static_cast<int64_t>(r1.value);
if (MAX_PWM != pwm0_value || MAX_PWM != pwm1_value)
{
std::cerr << "bad PWM starting point.\n";
return -EINVAL;
}
r0 = fan0->read();
r1 = fan1->read();
int64_t fan0_start = r0.value;
int64_t fan1_start = r1.value;
tstamp t1 = std::chrono::high_resolution_clock::now();
/*
* I've done experiments, and seen 9080,10243 as a starting point
* which leads to a 50% goal of 4830.5, which is higher than the
* average that they reach, 4668. -- i guess i could try to figure out
* a good increase from one to the other, but how fast they're going
* actually influences how much they influence, so at slower speeds the
* improvement is less.
*/
series.push_back(std::make_tuple(t1, fan0_start, fan1_start));
seriesCnt += 1;
int64_t average = (fan0_start + fan1_start) / 2;
int64_t goal = 0.5 * average;
std::cerr << "goal: " << goal << "\n";
// fan0 @ 128: 4691
// fan4 @ 128: 4707
fanSensors.push_back(std::move(fan0));
fanSensors.push_back(std::move(fan1));
if (DRIVE_TIME == drive)
{
driveTime(seriesCnt, 128, goal, series, fanSensors);
}
else if (DRIVE_GOAL == drive)
{
driveGoal(seriesCnt, 128, goal, series, fanSensors);
}
tstamp tp = t1;
/* Output the values and the timepoints as a time series for review. */
for (auto& t : series)
{
tstamp ts = std::get<0>(t);
int64_t n0 = std::get<1>(t);
int64_t n1 = std::get<2>(t);
auto duration =
std::chrono::duration_cast<std::chrono::microseconds>(ts - tp)
.count();
std::cout << duration << "us, " << n0 << ", " << n1 << "\n";
tp = ts;
}
return 0;
}