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/*
* Copyright 2020 Kai Uwe Broulik <kde@broulik.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License or (at your option) version 3 or any later version
* accepted by the membership of KDE e.V. (or its successor approved
* by the membership of KDE e.V.), which shall act as a proxy
* defined in Section 14 of version 3 of the license.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "chargethresholdhelper.h"
#include <powerdevil_debug.h>
#include <algorithm>
#include <QDir>
#include <QFile>
static const QString s_powerSupplySysFsPath = QStringLiteral("/sys/class/power_supply");
static const QString s_chargeStartThreshold = QStringLiteral("charge_start_threshold");
static const QString s_chargeStopThreshold = QStringLiteral("charge_stop_threshold");
ChargeThresholdHelper::ChargeThresholdHelper(QObject *parent)
: QObject(parent)
{
}
static QStringList getBatteries()
{
return QDir(s_powerSupplySysFsPath).entryList({QStringLiteral("BAT*")}, QDir::Dirs);
}
static QVector<int> getThresholds(const QString &which)
{
QVector<int> thresholds;
const QStringList batteries = getBatteries();
for (const QString &battery : batteries) {
QFile file(s_powerSupplySysFsPath + QLatin1Char('/') + battery + QLatin1Char('/') + which);
if (!file.open(QIODevice::ReadOnly)) {
qWarning() << "Failed to open" << file.fileName() << "for reading";
continue;
}
int threshold = -1;
QTextStream stream(&file);
stream >> threshold;
if (threshold < 0 || threshold > 100) {
qWarning() << file.fileName() << "contains invalid threshold" << threshold;
continue;
}
thresholds.append(threshold);
}
return thresholds;
}
static bool setThresholds(const QString &which, int threshold)
{
const QStringList batteries = getBatteries();
for (const QString &battery : batteries) {
QFile file(s_powerSupplySysFsPath + QLatin1Char('/') + battery + QLatin1Char('/') + which);
// TODO should we check the current value before writing the new one or is it clever
// enough not to shred some chip by writing the same thing again?
if (!file.open(QIODevice::WriteOnly)) {
qWarning() << "Failed to open" << file.fileName() << "for writing";
return false;
}
if (file.write(QByteArray::number(threshold)) == -1) {
qWarning() << "Failed to write threshold into" << file.fileName();
return false;
}
}
return true;
}
ActionReply ChargeThresholdHelper::getthreshold(const QVariantMap &args)
{
Q_UNUSED(args);
const auto startThresholds = getThresholds(s_chargeStartThreshold);
const auto stopThresholds = getThresholds(s_chargeStopThreshold);
if (startThresholds.isEmpty() || stopThresholds.isEmpty() || startThresholds.count() != stopThresholds.count()) {
auto reply = ActionReply::HelperErrorReply();
reply.setErrorDescription(QStringLiteral("Charge thresholds not supported"));
return reply;
}
// In the rare case there are multiple batteries with varying charge thresholds, try to use something sensible
const int startThreshold = *std::max_element(startThresholds.begin(), startThresholds.end());
const int stopThreshold = *std::min_element(stopThresholds.begin(), stopThresholds.end());
ActionReply reply;
reply.setData({
{QStringLiteral("chargeStartThreshold"), startThreshold},
{QStringLiteral("chargeStopThreshold"), stopThreshold}
});
return reply;
}
ActionReply ChargeThresholdHelper::setthreshold(const QVariantMap &args)
{
const int startThreshold = args.value(QStringLiteral("chargeStartThreshold")).toInt();
const int stopThreshold = args.value(QStringLiteral("chargeStopThreshold")).toInt();
if (startThreshold < 0
|| startThreshold > 100
|| stopThreshold < 0
|| stopThreshold > 100
|| startThreshold > stopThreshold) {
auto reply = ActionReply::HelperErrorReply(); // is there an "invalid arguments" error?
reply.setErrorDescription(QStringLiteral("Invalid thresholds provided"));
return reply;
}
if (!setThresholds(s_chargeStartThreshold, startThreshold)) {
auto reply = ActionReply::HelperErrorReply();
reply.setErrorDescription(QStringLiteral("Failed to write start charge threshold"));
return reply;
}
if (!setThresholds(s_chargeStopThreshold, stopThreshold)) {
auto reply = ActionReply::HelperErrorReply();
reply.setErrorDescription(QStringLiteral("Failed to write stop charge threshold"));
return reply;
}
return ActionReply();
}
KAUTH_HELPER_MAIN("org.kde.powerdevil.chargethresholdhelper", ChargeThresholdHelper)
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