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39
40 #include "qdevicediscovery_static_p.h"
41
42 #include <QStringList>
43 #include <QCoreApplication>
44 #include <QObject>
45 #include <QHash>
46 #include <QDir>
47 #include <QLoggingCategory>
48 #include <QtCore/private/qcore_unix_p.h>
49
50 #include <linux/input.h>
51 #include <fcntl.h>
52
53 /* android (and perhaps some other linux-derived stuff) don't define everything
54 * in linux/input.h, so we'll need to do that ourselves.
55 */
56 #ifndef KEY_CNT
57 #define KEY_CNT (KEY_MAX+1)
58 #endif
59 #ifndef REL_CNT
60 #define REL_CNT (REL_MAX+1)
61 #endif
62 #ifndef ABS_CNT
63 #define ABS_CNT (ABS_MAX+1)
64 #endif
65 #ifndef ABS_MT_POSITION_X
66 #define ABS_MT_POSITION_X 0x35
67 #endif
68 #ifndef ABS_MT_POSITION_Y
69 #define ABS_MT_POSITION_Y 0x36
70 #endif
71
72 #define LONG_BITS (sizeof(long) * 8 )
73 #define LONG_FIELD_SIZE(bits) ((bits / LONG_BITS) + 1)
74
testBit(long bit,const long * field)75 static bool testBit(long bit, const long *field)
76 {
77 return (field[bit / LONG_BITS] >> bit % LONG_BITS) & 1;
78 }
79
80 QT_BEGIN_NAMESPACE
81
82 Q_LOGGING_CATEGORY(lcDD, "qt.qpa.input")
83
create(QDeviceTypes types,QObject * parent)84 QDeviceDiscovery *QDeviceDiscovery::create(QDeviceTypes types, QObject *parent)
85 {
86 return new QDeviceDiscoveryStatic(types, parent);
87 }
88
QDeviceDiscoveryStatic(QDeviceTypes types,QObject * parent)89 QDeviceDiscoveryStatic::QDeviceDiscoveryStatic(QDeviceTypes types, QObject *parent)
90 : QDeviceDiscovery(types, parent)
91 {
92 qCDebug(lcDD) << "static device discovery for type" << types;
93 }
94
scanConnectedDevices()95 QStringList QDeviceDiscoveryStatic::scanConnectedDevices()
96 {
97 QStringList devices;
98 QDir dir;
99 dir.setFilter(QDir::System);
100
101 // check for input devices
102 if (m_types & Device_InputMask) {
103 dir.setPath(QString::fromLatin1(QT_EVDEV_DEVICE_PATH));
104 const auto deviceFiles = dir.entryList();
105 for (const QString &deviceFile : deviceFiles) {
106 QString absoluteFilePath = dir.absolutePath() + QLatin1Char('/') + deviceFile;
107 if (checkDeviceType(absoluteFilePath))
108 devices << absoluteFilePath;
109 }
110 }
111
112 // check for drm devices
113 if (m_types & Device_VideoMask) {
114 dir.setPath(QString::fromLatin1(QT_DRM_DEVICE_PATH));
115 const auto deviceFiles = dir.entryList();
116 for (const QString &deviceFile : deviceFiles) {
117 QString absoluteFilePath = dir.absolutePath() + QLatin1Char('/') + deviceFile;
118 if (checkDeviceType(absoluteFilePath))
119 devices << absoluteFilePath;
120 }
121 }
122
123 qCDebug(lcDD) << "Found matching devices" << devices;
124
125 return devices;
126 }
127
checkDeviceType(const QString & device)128 bool QDeviceDiscoveryStatic::checkDeviceType(const QString &device)
129 {
130 int fd = QT_OPEN(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
131 if (Q_UNLIKELY(fd == -1)) {
132 qWarning() << "Device discovery cannot open device" << device;
133 return false;
134 }
135
136 qCDebug(lcDD) << "doing static device discovery for " << device;
137
138 if ((m_types & Device_DRM) && device.contains(QLatin1String(QT_DRM_DEVICE_PREFIX))) {
139 QT_CLOSE(fd);
140 return true;
141 }
142
143 long bitsAbs[LONG_FIELD_SIZE(ABS_CNT)];
144 long bitsKey[LONG_FIELD_SIZE(KEY_CNT)];
145 long bitsRel[LONG_FIELD_SIZE(REL_CNT)];
146 memset(bitsAbs, 0, sizeof(bitsAbs));
147 memset(bitsKey, 0, sizeof(bitsKey));
148 memset(bitsRel, 0, sizeof(bitsRel));
149
150 ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(bitsAbs)), bitsAbs);
151 ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(bitsKey)), bitsKey);
152 ioctl(fd, EVIOCGBIT(EV_REL, sizeof(bitsRel)), bitsRel);
153
154 QT_CLOSE(fd);
155
156 if ((m_types & Device_Keyboard)) {
157 if (testBit(KEY_Q, bitsKey)) {
158 qCDebug(lcDD) << "Found keyboard at" << device;
159 return true;
160 }
161 }
162
163 if ((m_types & Device_Mouse)) {
164 if (testBit(REL_X, bitsRel) && testBit(REL_Y, bitsRel) && testBit(BTN_MOUSE, bitsKey)) {
165 qCDebug(lcDD) << "Found mouse at" << device;
166 return true;
167 }
168 }
169
170 if ((m_types & (Device_Touchpad | Device_Touchscreen))) {
171 if (testBit(ABS_X, bitsAbs) && testBit(ABS_Y, bitsAbs)) {
172 if ((m_types & Device_Touchpad) && testBit(BTN_TOOL_FINGER, bitsKey)) {
173 qCDebug(lcDD) << "Found touchpad at" << device;
174 return true;
175 } else if ((m_types & Device_Touchscreen) && testBit(BTN_TOUCH, bitsKey)) {
176 qCDebug(lcDD) << "Found touchscreen at" << device;
177 return true;
178 } else if ((m_types & Device_Tablet) && (testBit(BTN_STYLUS, bitsKey) || testBit(BTN_TOOL_PEN, bitsKey))) {
179 qCDebug(lcDD) << "Found tablet at" << device;
180 return true;
181 }
182 } else if (testBit(ABS_MT_POSITION_X, bitsAbs) &&
183 testBit(ABS_MT_POSITION_Y, bitsAbs)) {
184 qCDebug(lcDD) << "Found new-style touchscreen at" << device;
185 return true;
186 }
187 }
188
189 if ((m_types & Device_Joystick)) {
190 if (testBit(BTN_A, bitsKey) || testBit(BTN_TRIGGER, bitsKey) || testBit(ABS_RX, bitsAbs)) {
191 qCDebug(lcDD) << "Found joystick/gamepad at" << device;
192 return true;
193 }
194 }
195
196 return false;
197 }
198
199 QT_END_NAMESPACE
200