Unity 8
qinputdeviceinfo_linux.cpp
1 /****************************************************************************
2 **
3 ** Copyright (C) 2014 Canonical, Ltd. and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/legal
5 **
6 ** This file is part of the QtSystems module of the Qt Toolkit.
7 **
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** Commercial License Usage
10 ** Licensees holding valid commercial Qt licenses may use this file in
11 ** accordance with the commercial license agreement provided with the
12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and Digia. For licensing terms and
14 ** conditions see http://qt.digia.com/licensing. For further information
15 ** use the contact form at http://qt.digia.com/contact-us.
16 **
17 ** GNU Lesser General Public License Usage
18 ** Alternatively, this file may be used under the terms of the GNU Lesser
19 ** General Public License version 2.1 as published by the Free Software
20 ** Foundation and appearing in the file LICENSE.LGPL included in the
21 ** packaging of this file. Please review the following information to
22 ** ensure the GNU Lesser General Public License version 2.1 requirements
23 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
24 **
25 ** In addition, as a special exception, Digia gives you certain additional
26 ** rights. These rights are described in the Digia Qt LGPL Exception
27 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
28 **
29 ** GNU General Public License Usage
30 ** Alternatively, this file may be used under the terms of the GNU
31 ** General Public License version 3.0 as published by the Free Software
32 ** Foundation and appearing in the file LICENSE.GPL included in the
33 ** packaging of this file. Please review the following information to
34 ** ensure the GNU General Public License version 3.0 requirements will be
35 ** met: http://www.gnu.org/copyleft/gpl.html.
36 **
37 **
38 ** $QT_END_LICENSE$
39 **
40 ****************************************************************************/
41 
42 #include "qinputdeviceinfo_linux_p.h"
43 
44 #include <libudev.h>
45 #include <libevdev/libevdev.h>
46 #include <fcntl.h>
47 #include <QDebug>
48 #include <QSocketNotifier>
49 #include <QTimer>
50 
51 QInputDeviceInfoPrivate::QInputDeviceInfoPrivate(QObject *parent) :
52  QObject(parent)
53  , udev(0)
54 {
55  QTimer::singleShot(250,this,SLOT(init()));
56 }
57 
58 void QInputDeviceInfoPrivate::init()
59 {
60  if (!udev)
61  udev = udev_new();
62 
63  struct udev_list_entry *devices, *dev_list_entry;
64  struct udev_device *dev;
65 
66  QString subsystem = QStringLiteral("input");
67  struct udev_enumerate *enumerate = 0;
68 
69  if (udev) {
70 
71  udevMonitor = udev_monitor_new_from_netlink(udev, "udev");
72  udev_monitor_filter_add_match_subsystem_devtype(udevMonitor, subsystem.toLatin1(), NULL);
73  enumerate = udev_enumerate_new(udev);
74  udev_enumerate_add_match_subsystem(enumerate, subsystem.toLatin1());
75 
76 
77  udev_monitor_enable_receiving(udevMonitor);
78  notifierFd = udev_monitor_get_fd(udevMonitor);
79 
80  notifier = new QSocketNotifier(notifierFd, QSocketNotifier::Read, this);
81  connect(notifier, SIGNAL(activated(int)), this, SLOT(onUDevChanges()));
82 
83 
84  udev_enumerate_scan_devices(enumerate);
85  devices = udev_enumerate_get_list_entry(enumerate);
86 
87  udev_list_entry_foreach(dev_list_entry, devices) {
88  const char *path;
89  path = udev_list_entry_get_name(dev_list_entry);
90 
91  dev = udev_device_new_from_syspath(udev, path);
92 
93  QString eventPath = QString::fromLatin1(udev_device_get_sysname(dev));
94 
95  if (qstrcmp(udev_device_get_subsystem(dev), "input") == 0 ) {
96 
97  if (eventPath.contains(QStringLiteral("event"))) {
98  eventPath.prepend(QStringLiteral("/dev/input/"));
99 
100  QInputDevice *iDevice = addDevice(eventPath);
101  if (!iDevice)
102  continue;
103 
104  qDebug() << "*** ADDING DEVICE" << eventPath;
105 
106  iDevice->setTypes(getInputTypes(dev));
107 
108  if (iDevice->switches().count() > 0 && iDevice->buttons().count() == 0)
109  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Switch);
110 
111  if (iDevice->buttons().count() > 0 && iDevice->types() == QInputDeviceInfo::Unknown)
112  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Button);
113 
114  deviceList.append(iDevice);
115  deviceMap.insert(eventPath,iDevice);
116  Q_EMIT newDevice(eventPath);
117 
118  }
119  }
120  }
121  udev_enumerate_unref(enumerate);
122  }
123  Q_EMIT ready();
124 }
125 
126 QInputDeviceInfo::InputTypes QInputDeviceInfoPrivate::getInputTypes( struct udev_device *dev)
127 {
128  qDebug() << "******* have input type Keyboard" << udev_device_get_property_value(dev, "ID_INPUT_KEYBOARD");
129  qDebug() << "******* have input type Mouse" << udev_device_get_property_value(dev, "ID_INPUT_MOUSE");
130  qDebug() << "******* have input type Touchpad" << udev_device_get_property_value(dev, "ID_INPUT_TOUCHPAD");
131  qDebug() << "******* have input type Touchscreen" << udev_device_get_property_value(dev, "ID_INPUT_TOUCHSCREEN");
132  qDebug() << "******* have input type Tablet" << udev_device_get_property_value(dev, "ID_INPUT_TABLET");
133  qDebug() << "******* have input type joystick" << udev_device_get_property_value(dev, "ID_INPUT_JOYSTICK");
134  QInputDeviceInfo::InputTypes types = QInputDeviceInfo::Unknown;
135  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_KEYBOARD"), "1") == 0 )
136  types |= QInputDeviceInfo::Keyboard;
137 
138  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_MOUSE"), "1") == 0)
139  types |= QInputDeviceInfo::Mouse;
140 
141  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHPAD"), "1") == 0)
142  types |= QInputDeviceInfo::TouchPad;
143 
144  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHSCREEN"), "1") == 0
145  || qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TABLET"), "1") == 0)
146  types |= QInputDeviceInfo::TouchScreen;
147 
148  return types;
149 }
150 
151 QInputDevice *QInputDeviceInfoPrivate::addDevice(const QString &path)
152 {
153  QInputDevice *inputDevice = new QInputDevice(this);
154 
155  struct libevdev *dev = NULL;
156  int fd;
157  int rc = 1;
158  fd = open(path.toLatin1(), O_RDONLY|O_NONBLOCK);
159 
160  if (fd == -1) {
161  qDebug() << "Failed to open";
162  return inputDevice;
163  }
164  rc = libevdev_new_from_fd(fd, &dev);
165  if (rc < 0) {
166  qDebug() << "Failed to init libevdev ("<< strerror(-rc) << ")";
167  return inputDevice;
168  }
169 
170  inputDevice->setName(QString::fromLatin1(libevdev_get_name(dev)));
171  inputDevice->setDevicePath(path);
172  for (int i = 0; i < EV_MAX; i++) {
173  if (i == EV_KEY || i == EV_SW || i == EV_REL
174  || i == EV_REL || i == EV_ABS) {
175  for (int j = 0; j < libevdev_event_type_get_max(i); j++) {
176  if (libevdev_has_event_code(dev, i, j)) {
177  switch (i) {
178  case EV_KEY:
179  inputDevice->addButton(j);
180  break;
181  case EV_SW:
182  inputDevice->addSwitch(j);
183  break;
184  case EV_REL:
185  inputDevice->addRelativeAxis(j);
186  break;
187  case EV_ABS:
188  inputDevice->addAbsoluteAxis(j);
189  break;
190  };
191  }
192  }
193  }
194  }
195  return inputDevice;
196 }
197 
198 void QInputDeviceInfoPrivate::removeDevice(const QString &path)
199 {
200  for (int i = 0; i < deviceList.size(); ++i) {
201  if (deviceList.at(i)->devicePath() == path) {
202  delete deviceList.takeAt(i);
203  deviceMap.remove(path);
204  Q_EMIT deviceRemoved(path);
205  }
206  }
207 }
208 
209 void QInputDeviceInfoPrivate::onUDevChanges()
210 {
211  struct udev_device *dev = udev_monitor_receive_device(udevMonitor);
212  if (dev) {
213  if (qstrcmp(udev_device_get_subsystem(dev), "input") == 0 ) {
214  QString eventPath = QString::fromLatin1(udev_device_get_sysname(dev));
215 
216  if (eventPath.contains(QStringLiteral("input")))
217  return;
218 
219  QString action = QString::fromStdString(udev_device_get_action(dev));
220 
221  if (!eventPath.contains(QStringLiteral("/dev/input/")))
222  eventPath.prepend(QStringLiteral("/dev/input/"));
223 
224  if (action == QStringLiteral("add")) {
225 
226  QInputDevice *iDevice = addDevice(eventPath);
227  if (!iDevice)
228  return;
229 
230  iDevice->setTypes(getInputTypes(dev));
231  udev_device_unref(dev);
232 
233  if (iDevice->switches().count() > 0 && iDevice->buttons().count() == 0)
234  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Switch);
235 
236  if (iDevice->buttons().count() > 0 && iDevice->types() == QInputDeviceInfo::Unknown)
237  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Button);
238 
239  deviceList.append(iDevice);
240  deviceMap.insert(eventPath,iDevice);
241 
242  Q_EMIT newDevice(eventPath);
243 
244  } else if (action == QStringLiteral("remove")) {
245  removeDevice(eventPath);
246  }
247  }
248  }
249 }