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39
40#include "qevdevtablethandler_p.h"
41
42#include <QStringList>
43#include <QSocketNotifier>
44#include <QGuiApplication>
45#include <QPointingDevice>
46#include <QLoggingCategory>
47#include <QtCore/private/qcore_unix_p.h>
48#include <qpa/qwindowsysteminterface.h>
49#ifdef Q_OS_FREEBSD
50#include <dev/evdev/input.h>
51#else
52#include <linux/input.h>
53#endif
54
55QT_BEGIN_NAMESPACE
56
57Q_LOGGING_CATEGORY(qLcEvdevTablet, "qt.qpa.input")
58
59class QEvdevTabletData
60{
61public:
62 QEvdevTabletData(QEvdevTabletHandler *q_ptr);
63
64 void processInputEvent(input_event *ev);
65 void report();
66
67 QEvdevTabletHandler *q;
68 int lastEventType;
69 QString devName;
70 struct {
71 int x, y, p, d;
72 } minValues, maxValues;
73 struct {
74 int x, y, p, d;
75 bool down, lastReportDown;
76 int tool, lastReportTool;
77 QPointF lastReportPos;
78 } state;
79};
80
81QEvdevTabletData::QEvdevTabletData(QEvdevTabletHandler *q_ptr)
82 : q(q_ptr), lastEventType(0)
83{
84 memset(&minValues, 0, sizeof(minValues));
85 memset(&maxValues, 0, sizeof(maxValues));
86 memset(static_cast<void *>(&state), 0, sizeof(state));
87}
88
89void QEvdevTabletData::processInputEvent(input_event *ev)
90{
91 if (ev->type == EV_ABS) {
92 switch (ev->code) {
93 case ABS_X:
94 state.x = ev->value;
95 break;
96 case ABS_Y:
97 state.y = ev->value;
98 break;
99 case ABS_PRESSURE:
100 state.p = ev->value;
101 break;
102 case ABS_DISTANCE:
103 state.d = ev->value;
104 break;
105 default:
106 break;
107 }
108 } else if (ev->type == EV_KEY) {
109 // code BTN_TOOL_* value 1 -> proximity enter
110 // code BTN_TOOL_* value 0 -> proximity leave
111 // code BTN_TOUCH value 1 -> contact with screen
112 // code BTN_TOUCH value 0 -> no contact
113 switch (ev->code) {
114 case BTN_TOUCH:
115 state.down = ev->value != 0;
116 break;
117 case BTN_TOOL_PEN:
118 state.tool = ev->value ? int(QPointingDevice::PointerType::Pen) : 0;
119 break;
120 case BTN_TOOL_RUBBER:
121 state.tool = ev->value ? int(QPointingDevice::PointerType::Eraser) : 0;
122 break;
123 default:
124 break;
125 }
126 } else if (ev->type == EV_SYN && ev->code == SYN_REPORT && lastEventType != ev->type) {
127 report();
128 }
129 lastEventType = ev->type;
130}
131
132void QEvdevTabletData::report()
133{
134 if (!state.lastReportTool && state.tool)
135 QWindowSystemInterface::handleTabletEnterProximityEvent(int(QInputDevice::DeviceType::Stylus), state.tool, q->deviceId());
136
137 qreal nx = (state.x - minValues.x) / qreal(maxValues.x - minValues.x);
138 qreal ny = (state.y - minValues.y) / qreal(maxValues.y - minValues.y);
139
140 QRect winRect = QGuiApplication::primaryScreen()->geometry();
141 QPointF globalPos(nx * winRect.width(), ny * winRect.height());
142 int pointer = state.tool;
143 // Prevent sending confusing values of 0 when moving the pen outside the active area.
144 if (!state.down && state.lastReportDown) {
145 globalPos = state.lastReportPos;
146 pointer = state.lastReportTool;
147 }
148
149 int pressureRange = maxValues.p - minValues.p;
150 qreal pressure = pressureRange ? (state.p - minValues.p) / qreal(pressureRange) : qreal(1);
151
152 if (state.down || state.lastReportDown) {
153 QWindowSystemInterface::handleTabletEvent(0, QPointF(), globalPos,
154 int(QInputDevice::DeviceType::Stylus), pointer,
155 state.down ? Qt::LeftButton : Qt::NoButton,
156 pressure, 0, 0, 0, 0, 0, q->deviceId(),
157 qGuiApp->keyboardModifiers());
158 }
159
160 if (state.lastReportTool && !state.tool)
161 QWindowSystemInterface::handleTabletLeaveProximityEvent(int(QInputDevice::DeviceType::Stylus), state.tool, q->deviceId());
162
163 state.lastReportDown = state.down;
164 state.lastReportTool = state.tool;
165 state.lastReportPos = globalPos;
166}
167
168
169QEvdevTabletHandler::QEvdevTabletHandler(const QString &device, const QString &spec, QObject *parent)
170 : QObject(parent), m_fd(-1), m_device(device), m_notifier(0), d(0)
171{
172 Q_UNUSED(spec);
173
174 setObjectName(QLatin1String("Evdev Tablet Handler"));
175
176 qCDebug(qLcEvdevTablet, "evdevtablet: using %ls", qUtf16Printable(device));
177
178 m_fd = QT_OPEN(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
179 if (m_fd < 0) {
180 qErrnoWarning("evdevtablet: Cannot open input device %ls", qUtf16Printable(device));
181 return;
182 }
183
184 bool grabSuccess = !ioctl(m_fd, EVIOCGRAB, (void *) 1);
185 if (grabSuccess)
186 ioctl(m_fd, EVIOCGRAB, (void *) 0);
187 else
188 qWarning("evdevtablet: %ls: The device is grabbed by another process. No events will be read.", qUtf16Printable(device));
189
190 d = new QEvdevTabletData(this);
191 if (!queryLimits())
192 qWarning("evdevtablet: %ls: Unset or invalid ABS limits. Behavior will be unspecified.", qUtf16Printable(device));
193
194 m_notifier = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);
195 connect(m_notifier, &QSocketNotifier::activated, this, &QEvdevTabletHandler::readData);
196}
197
198QEvdevTabletHandler::~QEvdevTabletHandler()
199{
200 if (m_fd >= 0)
201 QT_CLOSE(m_fd);
202
203 delete d;
204}
205
206qint64 QEvdevTabletHandler::deviceId() const
207{
208 return m_fd;
209}
210
211bool QEvdevTabletHandler::queryLimits()
212{
213 bool ok = true;
214 input_absinfo absInfo;
215 memset(&absInfo, 0, sizeof(input_absinfo));
216 ok &= ioctl(m_fd, EVIOCGABS(ABS_X), &absInfo) >= 0;
217 if (ok) {
218 d->minValues.x = absInfo.minimum;
219 d->maxValues.x = absInfo.maximum;
220 qCDebug(qLcEvdevTablet, "evdevtablet: %ls: min X: %d max X: %d", qUtf16Printable(m_device),
221 d->minValues.x, d->maxValues.x);
222 }
223 ok &= ioctl(m_fd, EVIOCGABS(ABS_Y), &absInfo) >= 0;
224 if (ok) {
225 d->minValues.y = absInfo.minimum;
226 d->maxValues.y = absInfo.maximum;
227 qCDebug(qLcEvdevTablet, "evdevtablet: %ls: min Y: %d max Y: %d", qUtf16Printable(m_device),
228 d->minValues.y, d->maxValues.y);
229 }
230 if (ioctl(m_fd, EVIOCGABS(ABS_PRESSURE), &absInfo) >= 0) {
231 d->minValues.p = absInfo.minimum;
232 d->maxValues.p = absInfo.maximum;
233 qCDebug(qLcEvdevTablet, "evdevtablet: %ls: min pressure: %d max pressure: %d", qUtf16Printable(m_device),
234 d->minValues.p, d->maxValues.p);
235 }
236 if (ioctl(m_fd, EVIOCGABS(ABS_DISTANCE), &absInfo) >= 0) {
237 d->minValues.d = absInfo.minimum;
238 d->maxValues.d = absInfo.maximum;
239 qCDebug(qLcEvdevTablet, "evdevtablet: %ls: min distance: %d max distance: %d", qUtf16Printable(m_device),
240 d->minValues.d, d->maxValues.d);
241 }
242 char name[128];
243 if (ioctl(m_fd, EVIOCGNAME(sizeof(name) - 1), name) >= 0) {
244 d->devName = QString::fromLocal8Bit(name);
245 qCDebug(qLcEvdevTablet, "evdevtablet: %ls: device name: %s", qUtf16Printable(m_device), name);
246 }
247 return ok;
248}
249
250void QEvdevTabletHandler::readData()
251{
252 input_event buffer[32];
253 int n = 0;
254 for (; ;) {
255 int result = QT_READ(m_fd, reinterpret_cast<char*>(buffer) + n, sizeof(buffer) - n);
256 if (!result) {
257 qWarning("evdevtablet: %ls: Got EOF from input device", qUtf16Printable(m_device));
258 return;
259 } else if (result < 0) {
260 if (errno != EINTR && errno != EAGAIN) {
261 qErrnoWarning("evdevtablet: %ls: Could not read from input device", qUtf16Printable(m_device));
262 if (errno == ENODEV) { // device got disconnected -> stop reading
263 delete m_notifier;
264 m_notifier = 0;
265 QT_CLOSE(m_fd);
266 m_fd = -1;
267 }
268 return;
269 }
270 } else {
271 n += result;
272 if (n % sizeof(input_event) == 0)
273 break;
274 }
275 }
276
277 n /= sizeof(input_event);
278
279 for (int i = 0; i < n; ++i)
280 d->processInputEvent(&buffer[i]);
281}
282
283
284QEvdevTabletHandlerThread::QEvdevTabletHandlerThread(const QString &device, const QString &spec, QObject *parent)
285 : QDaemonThread(parent), m_device(device), m_spec(spec), m_handler(0)
286{
287 start();
288}
289
290QEvdevTabletHandlerThread::~QEvdevTabletHandlerThread()
291{
292 quit();
293 wait();
294}
295
296void QEvdevTabletHandlerThread::run()
297{
298 m_handler = new QEvdevTabletHandler(m_device, m_spec);
299 exec();
300 delete m_handler;
301 m_handler = 0;
302}
303
304
305QT_END_NAMESPACE
306