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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#ifdef Q_OS_FREEBSD
51#include <dev/evdev/input.h>
52#else
53#include <linux/input.h>
54#endif
55#include <fcntl.h>
56
57/* android (and perhaps some other linux-derived stuff) don't define everything
58 * in linux/input.h, so we'll need to do that ourselves.
59 */
60#ifndef KEY_CNT
61#define KEY_CNT (KEY_MAX+1)
62#endif
63#ifndef REL_CNT
64#define REL_CNT (REL_MAX+1)
65#endif
66#ifndef ABS_CNT
67#define ABS_CNT (ABS_MAX+1)
68#endif
69#ifndef ABS_MT_POSITION_X
70#define ABS_MT_POSITION_X 0x35
71#endif
72#ifndef ABS_MT_POSITION_Y
73#define ABS_MT_POSITION_Y 0x36
74#endif
75
76#define LONG_BITS (sizeof(long) * 8 )
77#define LONG_FIELD_SIZE(bits) ((bits / LONG_BITS) + 1)
78
79static bool testBit(long bit, const long *field)
80{
81 return (field[bit / LONG_BITS] >> bit % LONG_BITS) & 1;
82}
83
84QT_BEGIN_NAMESPACE
85
86Q_LOGGING_CATEGORY(lcDD, "qt.qpa.input")
87
88QDeviceDiscovery *QDeviceDiscovery::create(QDeviceTypes types, QObject *parent)
89{
90 return new QDeviceDiscoveryStatic(types, parent);
91}
92
93QDeviceDiscoveryStatic::QDeviceDiscoveryStatic(QDeviceTypes types, QObject *parent)
94 : QDeviceDiscovery(types, parent)
95{
96 qCDebug(lcDD) << "static device discovery for type" << types;
97}
98
99QStringList QDeviceDiscoveryStatic::scanConnectedDevices()
100{
101 QStringList devices;
102 QDir dir;
103 dir.setFilter(QDir::System);
104
105 // check for input devices
106 if (m_types & Device_InputMask) {
107 dir.setPath(QString::fromLatin1(QT_EVDEV_DEVICE_PATH));
108 const auto deviceFiles = dir.entryList();
109 for (const QString &deviceFile : deviceFiles) {
110 QString absoluteFilePath = dir.absolutePath() + QLatin1Char('/') + deviceFile;
111 if (checkDeviceType(absoluteFilePath))
112 devices << absoluteFilePath;
113 }
114 }
115
116 // check for drm devices
117 if (m_types & Device_VideoMask) {
118 dir.setPath(QString::fromLatin1(QT_DRM_DEVICE_PATH));
119 const auto deviceFiles = dir.entryList();
120 for (const QString &deviceFile : deviceFiles) {
121 QString absoluteFilePath = dir.absolutePath() + QLatin1Char('/') + deviceFile;
122 if (checkDeviceType(absoluteFilePath))
123 devices << absoluteFilePath;
124 }
125 }
126
127 qCDebug(lcDD) << "Found matching devices" << devices;
128
129 return devices;
130}
131
132bool QDeviceDiscoveryStatic::checkDeviceType(const QString &device)
133{
134 int fd = QT_OPEN(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
135 if (Q_UNLIKELY(fd == -1)) {
136 qWarning() << "Device discovery cannot open device" << device;
137 return false;
138 }
139
140 qCDebug(lcDD) << "doing static device discovery for " << device;
141
142 if ((m_types & Device_DRM) && device.contains(QLatin1String(QT_DRM_DEVICE_PREFIX))) {
143 QT_CLOSE(fd);
144 return true;
145 }
146
147 long bitsAbs[LONG_FIELD_SIZE(ABS_CNT)];
148 long bitsKey[LONG_FIELD_SIZE(KEY_CNT)];
149 long bitsRel[LONG_FIELD_SIZE(REL_CNT)];
150 memset(bitsAbs, 0, sizeof(bitsAbs));
151 memset(bitsKey, 0, sizeof(bitsKey));
152 memset(bitsRel, 0, sizeof(bitsRel));
153
154 ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(bitsAbs)), bitsAbs);
155 ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(bitsKey)), bitsKey);
156 ioctl(fd, EVIOCGBIT(EV_REL, sizeof(bitsRel)), bitsRel);
157
158 QT_CLOSE(fd);
159
160 if ((m_types & Device_Keyboard)) {
161 if (testBit(KEY_Q, bitsKey)) {
162 qCDebug(lcDD) << "Found keyboard at" << device;
163 return true;
164 }
165 }
166
167 if ((m_types & Device_Mouse)) {
168 if (testBit(REL_X, bitsRel) && testBit(REL_Y, bitsRel) && testBit(BTN_MOUSE, bitsKey)) {
169 qCDebug(lcDD) << "Found mouse at" << device;
170 return true;
171 }
172 }
173
174 if ((m_types & (Device_Touchpad | Device_Touchscreen))) {
175 if (testBit(ABS_X, bitsAbs) && testBit(ABS_Y, bitsAbs)) {
176 if ((m_types & Device_Touchpad) && testBit(BTN_TOOL_FINGER, bitsKey)) {
177 qCDebug(lcDD) << "Found touchpad at" << device;
178 return true;
179 } else if ((m_types & Device_Touchscreen) && testBit(BTN_TOUCH, bitsKey)) {
180 qCDebug(lcDD) << "Found touchscreen at" << device;
181 return true;
182 } else if ((m_types & Device_Tablet) && (testBit(BTN_STYLUS, bitsKey) || testBit(BTN_TOOL_PEN, bitsKey))) {
183 qCDebug(lcDD) << "Found tablet at" << device;
184 return true;
185 }
186 } else if (testBit(ABS_MT_POSITION_X, bitsAbs) &&
187 testBit(ABS_MT_POSITION_Y, bitsAbs)) {
188 qCDebug(lcDD) << "Found new-style touchscreen at" << device;
189 return true;
190 }
191 }
192
193 if ((m_types & Device_Joystick)) {
194 if (testBit(BTN_A, bitsKey) || testBit(BTN_TRIGGER, bitsKey) || testBit(ABS_RX, bitsAbs)) {
195 qCDebug(lcDD) << "Found joystick/gamepad at" << device;
196 return true;
197 }
198 }
199
200 return false;
201}
202
203QT_END_NAMESPACE
204