kutils: implement KPowerManager::setCPUGovernor()

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

kutils/kpowermanager/CMakeLists.txt

@@ -47,3 +47,20 @@ install(
     kded/org.freedesktop.PowerManagement.Inhibit.xml
     DESTINATION ${KDE4_DBUS_INTERFACES_INSTALL_DIR}
 )
+
+########### next target ###############
+
+set(kpowermanager_helper_srcs
+    kpowermanager_helper.cpp
+)
+
+add_executable(kpowermanager_helper ${kpowermanager_helper_srcs})
+target_link_libraries(kpowermanager_helper PUBLIC ${KDE4_KDECORE_LIBS})
+
+install(
+    TARGETS kpowermanager_helper
+    DESTINATION ${KDE4_LIBEXEC_INSTALL_DIR}
+)
+
+kde4_install_auth_helper_files(kpowermanager_helper org.kde.kpowermanager.helper root)
+

kutils/kpowermanager/kpowermanager.cpp

@@ -17,6 +17,7 @@
 */
 
 #include "kpowermanager.h"
+#include "kauthaction.h"
 #include "kdebug.h"
 
 #include <QFile>
@@ -66,8 +67,13 @@ bool KPowerManager::setCPUGovernor(const QString &governor)
         kWarning() << "Invalid CPU governor" << governor;
         return false;
     }
-    // TODO:
-    return false;
+
+    KAuth::Action helperaction("org.kde.kpowermanager.helper.setgovernor");
+    helperaction.setHelperID("org.kde.kpowermanager.helper");
+    helperaction.addArgument("governor", governor);
+    KAuth::ActionReply helperreply = helperaction.execute();
+    // qDebug() << helperreply.errorCode() << helperreply.errorDescription();
+    return (helperreply == KAuth::ActionReply::SuccessReply);
 }
 
 int KPowerManager::screenBrightness() const

kutils/kpowermanager/kpowermanager_helper.cpp

@@ -0,0 +1,65 @@
+/*  This file is part of the KDE libraries
+    Copyright (C) 2022 Ivailo Monev <xakepa10@gmail.com>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License version 2, as published by the Free Software Foundation.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include "kpowermanager_helper.h"
+#include "kauthhelpersupport.h"
+
+#include <QFile>
+#include <QDir>
+
+ActionReply KPowerManagerHelper::setgovernor(const QVariantMap &parameters)
+{
+    if (!parameters.contains("governor")) {
+        return KAuth::ActionReply::HelperErrorReply;
+    }
+
+    const QByteArray governorbytes = parameters.value("governor").toByteArray();
+    QDir cpudir("/sys/devices/system/cpu");
+    foreach (const QFileInfo &cpuinfo, cpudir.entryInfoList()) {
+        QFile cpufile(cpuinfo.filePath() + QLatin1String("/cpufreq/scaling_governor"));
+        if (!cpufile.exists()) {
+            continue;
+        }
+        if (!cpufile.open(QFile::WriteOnly)) {
+            KAuth::ActionReply errorreply(KAuth::ActionReply::HelperError);
+            errorreply.setErrorDescription(
+                QString::fromLatin1("Could not open: %1 (%2)")
+                    .arg(cpufile.fileName())
+                    .arg(cpufile.errorString()
+                )
+            );
+            errorreply.setErrorCode(1);
+            return errorreply;
+        }
+        if (cpufile.write(governorbytes) != governorbytes.size()) {
+            KAuth::ActionReply errorreply(KAuth::ActionReply::HelperError);
+            errorreply.setErrorDescription(
+                QString::fromLatin1("Could not write to: %1 (%2)")
+                    .arg(cpufile.fileName())
+                    .arg(cpufile.errorString()
+                )
+            );
+            errorreply.setErrorCode(2);
+            return errorreply;
+        }
+    }
+
+    return KAuth::ActionReply::SuccessReply;
+}
+
+KDE4_AUTH_HELPER_MAIN("org.kde.kpowermanager.helper", KPowerManagerHelper)

kutils/kpowermanager/kpowermanager_helper.h

@@ -0,0 +1,34 @@
+/*  This file is part of the KDE libraries
+    Copyright (C) 2022 Ivailo Monev <xakepa10@gmail.com>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License version 2, as published by the Free Software Foundation.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#ifndef KPOWERMANAGER_HELPER_H
+#define KPOWERMANAGER_HELPER_H
+
+#include <kauthactionreply.h>
+
+// methods return type must be ActionReply otherwise QMetaObject::invokeMethod() fails
+using namespace KAuth;
+
+class KPowerManagerHelper : public QObject
+{
+    Q_OBJECT
+public slots:
+    ActionReply setgovernor(const QVariantMap &parameters);
+};
+
+#endif // KPOWERMANAGER_HELPER_H