Remove linux sysfs backend

The backend provided accelerometer. The backend has been undocumented
since the beginning and has been virtually without any activity during
its existence.

Pick-to: 6.2
Task-number: QTBUG-95789
Change-Id: I7efb3ed10e68a729bc4c834b6c7c3bab9fd8169f
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

8 files changed, 6 insertions, 365 deletions

diff --git a/src/plugins/sensors/CMakeLists.txt b/src/plugins/sensors/CMakeLists.txt
index bf42ae8d..7b11ea7f 100644
--- a/src/plugins/sensors/CMakeLists.txt
+++ b/src/plugins/sensors/CMakeLists.txt
@@ -14,10 +14,6 @@ if (QT_FEATURE_winrt_sensors AND NOT SENSORS_PLUGINS OR "winrt" IN_LIST SENSORS_
     add_subdirectory(winrt)
 endif()
 
-if (LINUX AND NOT SENSORS_PLUGINS OR "linux" IN_LIST SENSORS_PLUGINS)
-    add_subdirectory(linux)
-endif()
-
 if (IOS AND NOT SENSORS_PLUGINS OR "ios" IN_LIST SENSORS_PLUGINS)
     add_subdirectory(ios)
 endif()
diff --git a/src/plugins/sensors/linux/CMakeLists.txt b/src/plugins/sensors/linux/CMakeLists.txt
deleted file mode 100644
index 5df7029d..00000000
--- a/src/plugins/sensors/linux/CMakeLists.txt
+++ /dev/null
@@ -1,25 +0,0 @@
-#####################################################################
-## LinuxSensorPlugin Plugin:
-#####################################################################
-
-qt_internal_add_plugin(LinuxSensorPlugin
-    OUTPUT_NAME qtsensors_linuxsys
-    PLUGIN_TYPE sensors
-    SOURCES
-        linuxsysaccelerometer.cpp linuxsysaccelerometer.h
-        main.cpp
-    LIBRARIES
-        Qt::Core
-        Qt::Sensors
-)
-
-#### Keys ignored in scope 1:.:.:linux.pro:<TRUE>:
-# OTHER_FILES = "plugin.json"
-
-## Scopes:
-#####################################################################
-
-qt_internal_extend_target(LinuxSensorPlugin CONDITION NOT ANDROID
-    LIBRARIES
-        rt
-)
diff --git a/src/plugins/sensors/linux/linuxsysaccelerometer.cpp b/src/plugins/sensors/linux/linuxsysaccelerometer.cpp
deleted file mode 100644
index c5c7e375..00000000
--- a/src/plugins/sensors/linux/linuxsysaccelerometer.cpp
+++ /dev/null
@@ -1,188 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtSensors module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "linuxsysaccelerometer.h"
-#include <QtCore/QDebug>
-#include <QtCore/QtGlobal>
-#include <QtCore/QFile>
-#include <QtCore/QDebug>
-#include <QtCore/QTimer>
-
-#include <QtCore/QStringList>
-
-#include <time.h>
-#include <errno.h>
-
-char const * const LinuxSysAccelerometer::id("linuxsys.accelerometer");
-
-// This plugin reads the accelerometer from a sys interface.
-
-// test machine (laptop):
-// QT_ACCEL_FILEPATH=/sys/devices/platform/lis3lv02d/position
-// QT_ACCEL_DATADIVISOR=7
-// QT_ACCEL_DELIMITER=,
-
-quint64 produceTimestamp()
-{
-    struct timespec tv;
-    int ok;
-
-#ifdef CLOCK_MONOTONIC_RAW
-    ok = clock_gettime(CLOCK_MONOTONIC_RAW, &tv);
-    if (ok != 0)
-#endif
-    ok = clock_gettime(CLOCK_MONOTONIC, &tv);
-    Q_ASSERT(ok == 0);
-
-    quint64 result = (tv.tv_sec * 1000000ULL) + (tv.tv_nsec * 0.001); // scale to microseconds
-    return result;
-}
-
-// TODO get output template from env and apply
-// Currently this assumes the output is like:
-// (x,y,z) or x,y,z
-
-LinuxSysAccelerometer::LinuxSysAccelerometer(QSensor *sensor)
-    : QSensorBackend(sensor)
-    , m_timerid(0)
-    , path(QString())
-    , divisor(0)
-    , delimiter(QString())
-{
-    setReading<QAccelerometerReading>(&m_reading);
-    addDataRate(1, 100); // 100Hz
-    addOutputRange(-22.418, 22.418, 0.17651); // 2G
-// not sure how to retrieve proper range
-
-    path = QString::fromLatin1(qgetenv("QT_ACCEL_FILEPATH"));
-    bool ok;
-    divisor = QString::fromLatin1(qgetenv("QT_ACCEL_DATADIVISOR")).toInt(&ok);
-    if (divisor == 0 || !ok) {
-        divisor = 1;
-    }
-    delimiter = QString::fromLatin1(qgetenv("QT_ACCEL_DELIMITER"));
-    file.setFileName(path);
-}
-
-LinuxSysAccelerometer::~LinuxSysAccelerometer()
-{
-}
-
-void LinuxSysAccelerometer::start()
-{
-    if (m_timerid)
-        return;
-
-    if (!openFile())
-        return;
-
-    int dataRate = sensor()->dataRate();
-    if (dataRate == 0) {
-        if (sensor()->availableDataRates().count())
-            dataRate = sensor()->availableDataRates().first().second;
-        else
-            dataRate = 1;
-    }
-
-    int interval = 1000 / dataRate;
-
-    if (interval)
-        m_timerid = startTimer(interval);
-}
-
-void LinuxSysAccelerometer::stop()
-{
-    if (m_timerid) {
-        killTimer(m_timerid);
-        m_timerid = 0;
-    }
-    closeFile();
-}
-
-void LinuxSysAccelerometer::poll()
-{
-    if (!file.isOpen())
-        return;
-
-    file.seek(0);
-    QString str = file.readLine();
-    if (str.isEmpty()) {
-        return;
-    }
-    str = str.simplified();
-
-    if (!str.at(0).isNumber() && str.at(0) != '-') {
-        str.remove(0,1);
-    }
-
-    if (!str.at(str.size()-1).isNumber()) {
-        str.chop(1);
-    }
-
-    QStringList accelDataList = str.split(delimiter);
-
-    m_reading.setTimestamp(produceTimestamp());
-    m_reading.setX(-accelDataList.at(0).toFloat() / divisor);
-    m_reading.setY(-accelDataList.at(1).toFloat() / divisor);
-    m_reading.setZ(-accelDataList.at(2).toFloat() / divisor);
-
-    newReadingAvailable();
-}
-
-void LinuxSysAccelerometer::timerEvent(QTimerEvent * /*event*/)
-{
-    poll();
-}
-
-bool LinuxSysAccelerometer::openFile()
-{
-    if (!path.isEmpty()
-            && !file.open(QIODevice::ReadOnly)) {
-        qWarning() << "Could not open file" << strerror(errno);
-        return false;
-    }
-    return true;
-}
-
-void LinuxSysAccelerometer::closeFile()
-{
-    file.close();
-}
-
-
diff --git a/src/plugins/sensors/linux/linuxsysaccelerometer.h b/src/plugins/sensors/linux/linuxsysaccelerometer.h
deleted file mode 100644
index af89bf77..00000000
--- a/src/plugins/sensors/linux/linuxsysaccelerometer.h
+++ /dev/null
@@ -1,74 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtSensors module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef LINUXSYSACCELEROMETER_H
-#define LINUXSYSACCELEROMETER_H
-
-#include <qsensorbackend.h>
-#include <qaccelerometer.h>
-#include <QtCore/QFile>
-
-
-class LinuxSysAccelerometer : public QSensorBackend
-{
-public:
-    static char const * const id;
-
-    LinuxSysAccelerometer(QSensor *sensor);
-    ~LinuxSysAccelerometer();
-
-    void start() override;
-    void stop() override;
-    void poll();
-    void timerEvent(QTimerEvent * /*event*/) override;
-
-private:
-    QAccelerometerReading m_reading;
-    int m_timerid;
-
-    bool openFile();
-    void closeFile();
-    QString path;
-    QFile file;
-    float divisor;
-    QString delimiter;
-};
-
-#endif // LINUXSYSACCELEROMETER_H
-
diff --git a/src/plugins/sensors/linux/main.cpp b/src/plugins/sensors/linux/main.cpp
deleted file mode 100644
index 6531d9d3..00000000
--- a/src/plugins/sensors/linux/main.cpp
+++ /dev/null
@@ -1,72 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the QtSensors module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 3 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL3 included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 3 requirements
-** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 2.0 or (at your option) the GNU General
-** Public license version 3 or any later version approved by the KDE Free
-** Qt Foundation. The licenses are as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-2.0.html and
-** https://www.gnu.org/licenses/gpl-3.0.html.
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include "linuxsysaccelerometer.h"
-
-#include <qsensorplugin.h>
-#include <qsensorbackend.h>
-#include <qsensormanager.h>
-
-#include <QtCore/QFile>
-#include <QtCore/QDebug>
-
-class LinuxSensorPlugin : public QObject, public QSensorPluginInterface, public QSensorBackendFactory
-{
-    Q_OBJECT
-    Q_PLUGIN_METADATA(IID "com.qt-project.Qt.QSensorPluginInterface/1.0" FILE "plugin.json")
-    Q_INTERFACES(QSensorPluginInterface)
-public:
-    void registerSensors() override
-    {
-        QString path = QString::fromLatin1(qgetenv("QT_ACCEL_FILEPATH"));
-        if (!path.isEmpty() && !QSensorManager::isBackendRegistered(QAccelerometer::sensorType, LinuxSysAccelerometer::id))
-            QSensorManager::registerBackend(QAccelerometer::sensorType, LinuxSysAccelerometer::id, this);
-    }
-
-    QSensorBackend *createBackend(QSensor *sensor) override
-    {
-        if (sensor->identifier() == LinuxSysAccelerometer::id)
-            return new LinuxSysAccelerometer(sensor);
-
-        return 0;
-    }
-};
-
-#include "main.moc"
-
diff --git a/src/plugins/sensors/linux/plugin.json b/src/plugins/sensors/linux/plugin.json
deleted file mode 100644
index f3863f11..00000000
--- a/src/plugins/sensors/linux/plugin.json
+++ /dev/null
@@ -1 +0,0 @@
-{ "Keys": [ "linux" ] }
diff --git a/src/sensors/doc/src/compatmap.qdoc b/src/sensors/doc/src/compatmap.qdoc
index 48384ee2..ef1340b8 100644
--- a/src/sensors/doc/src/compatmap.qdoc
+++ b/src/sensors/doc/src/compatmap.qdoc
@@ -62,7 +62,7 @@
     <tr>
     <td nowrap="nowrap">Accelerometer</td>
     <td bgcolor="green"></td>
-    <td bgcolor="green"></td>
+    <td bgcolor="gray"></td>
     <td bgcolor="green"></td>
     <td bgcolor="green"></td>
     <td bgcolor="gray"></td>
diff --git a/src/sensors/doc/src/qt6-changes.qdoc b/src/sensors/doc/src/qt6-changes.qdoc
index c82bf561..6f3c3598 100644
--- a/src/sensors/doc/src/qt6-changes.qdoc
+++ b/src/sensors/doc/src/qt6-changes.qdoc
@@ -71,6 +71,11 @@
     backend, and as such they are not currently listed as supported sensor
     types.
 
+    \section2 Linux
+
+    The Linux sysfs accelerometer support has been removed. The backend is
+    undocumented and has been without any real activity for almost 10 years.
+
     \section1 API changes
 
     \section2 Deleted typedef for qtimestamp