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unity8/plugins/Unity/InputInfo/linux/qinputdeviceinfo_linux.cpp
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1/****************************************************************************
2**
3** Copyright (C) 2014 Canonical, Ltd. and/or its subsidiary(-ies).
4** Contact: http://www.qt-project.org/legal
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29** GNU General Public License Usage
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40****************************************************************************/
42#include "qinputdeviceinfo_linux_p.h"
44#include <libudev.h>
45#include <libevdev/libevdev.h>
46#include <fcntl.h>
47#include <QDebug>
48#include <QSocketNotifier>
49#include <QTimer>
51QInputDeviceInfoPrivate::QInputDeviceInfoPrivate(QObject *parent) :
52 QObject(parent)
53 , udev(0)
55 QTimer::singleShot(250, this, &QInputDeviceInfoPrivate::init);
58void QInputDeviceInfoPrivate::init()
60 if (!udev)
61 udev = udev_new();
63 struct udev_list_entry *devices, *dev_list_entry;
64 struct udev_device *dev;
66 QString subsystem = QStringLiteral("input");
67 struct udev_enumerate *enumerate = 0;
69 if (udev) {
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());
77 udev_monitor_enable_receiving(udevMonitor);
78 notifierFd = udev_monitor_get_fd(udevMonitor);
80 notifier = new QSocketNotifier(notifierFd, QSocketNotifier::Read, this);
81 connect(notifier, &QSocketNotifier::activated, this, &QInputDeviceInfoPrivate::onUDevChanges);
84 udev_enumerate_scan_devices(enumerate);
85 devices = udev_enumerate_get_list_entry(enumerate);
87 udev_list_entry_foreach(dev_list_entry, devices) {
88 const char *path;
89 path = udev_list_entry_get_name(dev_list_entry);
91 dev = udev_device_new_from_syspath(udev, path);
93 QString eventPath = QString::fromLatin1(udev_device_get_sysname(dev));
95 if (qstrcmp(udev_device_get_subsystem(dev), "input") == 0 ) {
97 if (eventPath.contains(QStringLiteral("event"))) {
98 eventPath.prepend(QStringLiteral("/dev/input/"));
100 QInputDevice *iDevice = addDevice(eventPath);
101 if (!iDevice)
102 continue;
104 iDevice->setTypes(getInputTypes(dev));
106 if (iDevice->switches().count() > 0 && iDevice->buttons().count() == 0)
107 iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Switch);
109 if (iDevice->buttons().count() > 0 && iDevice->types() == QInputDeviceInfo::Unknown)
110 iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Button);
112 deviceList.append(iDevice);
113 deviceMap.insert(eventPath,iDevice);
114 Q_EMIT newDevice(eventPath);
116 }
117 }
118 }
119 udev_enumerate_unref(enumerate);
120 }
121 Q_EMIT ready();
124QInputDeviceInfo::InputTypes QInputDeviceInfoPrivate::getInputTypes( struct udev_device *dev)
126 QInputDeviceInfo::InputTypes types = QInputDeviceInfo::Unknown;
127 if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_KEYBOARD"), "1") == 0 )
128 types |= QInputDeviceInfo::Keyboard;
130 if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_MOUSE"), "1") == 0)
131 types |= QInputDeviceInfo::Mouse;
133 if (qstrcmp(udev_device_get_property_value(dev, "ID_INPUT_TOUCHPAD"), "1") == 0)
134 types |= QInputDeviceInfo::TouchPad;
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;
140 return types;
143QInputDevice *QInputDeviceInfoPrivate::addDevice(const QString &path)
145 QInputDevice *inputDevice = new QInputDevice(this);
146 inputDevice->setDevicePath(path);
148 struct libevdev *dev = NULL;
149 int fd;
150 int rc = 1;
151 fd = open(path.toLatin1(), O_RDONLY|O_NONBLOCK);
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 }
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;
189void QInputDeviceInfoPrivate::removeDevice(const QString &path)
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 }
200void QInputDeviceInfoPrivate::onUDevChanges()
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));
207 if (eventPath.contains(QStringLiteral("input")))
208 return;
210 QString action = QString::fromStdString(udev_device_get_action(dev));
212 if (!eventPath.contains(QStringLiteral("/dev/input/")))
213 eventPath.prepend(QStringLiteral("/dev/input/"));
215 if (action == QStringLiteral("add")) {
217 QInputDevice *iDevice = addDevice(eventPath);
218 if (!iDevice)
219 return;
221 iDevice->setTypes(getInputTypes(dev));
222 udev_device_unref(dev);
224 if (iDevice->switches().count() > 0 && iDevice->buttons().count() == 0)
225 iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Switch);
227 if (iDevice->buttons().count() > 0 && iDevice->types() == QInputDeviceInfo::Unknown)
228 iDevice->setTypes(iDevice->types() | QInputDeviceInfo::Button);
230 deviceList.append(iDevice);
231 deviceMap.insert(eventPath,iDevice);
233 Q_EMIT newDevice(eventPath);
235 } else if (action == QStringLiteral("remove")) {
236 removeDevice(eventPath);
237 }
238 }
239 }