Unity 8
qinputdeviceinfo_linux.cpp
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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, &QInputDeviceInfoPrivate::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, &QSocketNotifier::activated, this, &QInputDeviceInfoPrivate::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  iDevice->setTypes(getInputTypes(dev));
105 
106  if (iDevice->switches().count() > 0 && iDevice->buttons().count() == 0)
107  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Switch);
108 
109  if (iDevice->buttons().count() > 0 && iDevice->types() == QInputDeviceInfo::Unknown)
110  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Button);
111 
112  deviceList.append(iDevice);
113  deviceMap.insert(eventPath,iDevice);
114  Q_EMIT newDevice(eventPath);
115 
116  }
117  }
118  }
119  udev_enumerate_unref(enumerate);
120  }
121  Q_EMIT ready();
122 }
123 
124 QInputDeviceInfo::InputTypes QInputDeviceInfoPrivate::getInputTypes( struct udev_device *dev)
125 {
126  QInputDeviceInfo::InputTypes types = QInputDeviceInfo::Unknown;
127  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_KEYBOARD"), "1") == 0 )
128  types |= QInputDeviceInfo::Keyboard;
129 
130  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_MOUSE"), "1") == 0)
131  types |= QInputDeviceInfo::Mouse;
132 
133  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHPAD"), "1") == 0)
134  types |= QInputDeviceInfo::TouchPad;
135 
136  if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHSCREEN"), "1") == 0
137  || qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TABLET"), "1") == 0)
138  types |= QInputDeviceInfo::TouchScreen;
139 
140  return types;
141 }
142 
143 QInputDevice *QInputDeviceInfoPrivate::addDevice(const QString &path)
144 {
145  QInputDevice *inputDevice = new QInputDevice(this);
146  inputDevice->setDevicePath(path);
147 
148  struct libevdev *dev = NULL;
149  int fd;
150  int rc = 1;
151  fd = open(path.toLatin1(), O_RDONLY|O_NONBLOCK);
152 
153  if (fd == -1) {
154  return inputDevice;
155  }
156  rc = libevdev_new_from_fd(fd, &dev);
157  if (rc < 0) {
158  qWarning() << "Failed to init libevdev ("<< strerror(-rc) << ")";
159  return inputDevice;
160  }
161 
162  inputDevice->setName(QString::fromLatin1(libevdev_get_name(dev)));
163  for (int i = 0; i < EV_MAX; i++) {
164  if (i == EV_KEY || i == EV_SW || i == EV_REL
165  || i == EV_REL || i == EV_ABS) {
166  for (int j = 0; j < libevdev_event_type_get_max(i); j++) {
167  if (libevdev_has_event_code(dev, i, j)) {
168  switch (i) {
169  case EV_KEY:
170  inputDevice->addButton(j);
171  break;
172  case EV_SW:
173  inputDevice->addSwitch(j);
174  break;
175  case EV_REL:
176  inputDevice->addRelativeAxis(j);
177  break;
178  case EV_ABS:
179  inputDevice->addAbsoluteAxis(j);
180  break;
181  };
182  }
183  }
184  }
185  }
186  return inputDevice;
187 }
188 
189 void QInputDeviceInfoPrivate::removeDevice(const QString &path)
190 {
191  for (int i = 0; i < deviceList.size(); ++i) {
192  if (deviceList.at(i)->devicePath() == path) {
193  delete deviceList.takeAt(i);
194  deviceMap.remove(path);
195  Q_EMIT deviceRemoved(path);
196  }
197  }
198 }
199 
200 void QInputDeviceInfoPrivate::onUDevChanges()
201 {
202  struct udev_device *dev = udev_monitor_receive_device(udevMonitor);
203  if (dev) {
204  if (qstrcmp(udev_device_get_subsystem(dev), "input") == 0 ) {
205  QString eventPath = QString::fromLatin1(udev_device_get_sysname(dev));
206 
207  if (eventPath.contains(QStringLiteral("input")))
208  return;
209 
210  QString action = QString::fromStdString(udev_device_get_action(dev));
211 
212  if (!eventPath.contains(QStringLiteral("/dev/input/")))
213  eventPath.prepend(QStringLiteral("/dev/input/"));
214 
215  if (action == QStringLiteral("add")) {
216 
217  QInputDevice *iDevice = addDevice(eventPath);
218  if (!iDevice)
219  return;
220 
221  iDevice->setTypes(getInputTypes(dev));
222  udev_device_unref(dev);
223 
224  if (iDevice->switches().count() > 0 && iDevice->buttons().count() == 0)
225  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Switch);
226 
227  if (iDevice->buttons().count() > 0 && iDevice->types() == QInputDeviceInfo::Unknown)
228  iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Button);
229 
230  deviceList.append(iDevice);
231  deviceMap.insert(eventPath,iDevice);
232 
233  Q_EMIT newDevice(eventPath);
234 
235  } else if (action == QStringLiteral("remove")) {
236  removeDevice(eventPath);
237  }
238  }
239  }
240 }