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Test if the device is grabbed in some of the evdev plugins

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Even though they target embedded devices, the touch and tablet plugins
are very often used on desktop, under X, for development and
experimenting. However the X.org drivers like to grab the input
devices, resulting in getting no events when reading
directly. Inspired by evtest, we show a warning from now on in this
case so the user has a clue what's going on.

Change-Id: I19474f1fcc5163f2601e7000aaee0cce54f99367
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>
This commit is contained in:
Laszlo Agocs 2012-06-06 14:09:41 +03:00 committed by Qt by Nokia
parent 302e6968f1
commit 0cf0a2ae7c
2 changed files with 25 additions and 4 deletions
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21
src/platformsupport/input/evdevtablet/qevdevtablet.cpp
View File

@ -56,6 +56,7 @@ class QEvdevTabletData
public:
QEvdevTabletData(QEvdevTabletHandler *q_ptr);
bool queryLimits();
void testGrab();
void processInputEvent(input_event *ev);
void reportProximityEnter();
void reportProximityLeave();
@ -120,6 +121,15 @@ bool QEvdevTabletData::queryLimits()
return ok;
}
void QEvdevTabletData::testGrab()
{
bool grabSuccess = !ioctl(fd, EVIOCGRAB, (void *) 1);
if (grabSuccess)
ioctl(fd, EVIOCGRAB, (void *) 0);
else
qWarning("evdevtablet: ERROR: The device is grabbed by another process. No events will be read.");
}
void QEvdevTabletData::processInputEvent(input_event *ev)
{
if (ev->type == EV_ABS) {
@ -232,9 +242,14 @@ QEvdevTabletHandler::QEvdevTabletHandler(const QString &spec, QObject *parent)
if (!dev.isEmpty()) {
qDebug("evdevtablet: using %s", qPrintable(dev));
d->fd = QT_OPEN(dev.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
if (d->fd >= 0 && d->queryLimits()) {
d->notifier = new QSocketNotifier(d->fd, QSocketNotifier::Read, this);
connect(d->notifier, SIGNAL(activated(int)), this, SLOT(readData()));
if (d->fd >= 0) {
d->testGrab();
if (d->queryLimits()) {
d->notifier = new QSocketNotifier(d->fd, QSocketNotifier::Read, this);
connect(d->notifier, SIGNAL(activated(int)), this, SLOT(readData()));
}
} else {
qErrnoWarning(errno, "evdevtablet: Cannot open input device");
}
}
}

8
src/platformsupport/input/evdevtouch/qevdevtouch.cpp
View File

@ -179,7 +179,7 @@ QEvdevTouchScreenHandler::QEvdevTouchScreenHandler(const QString &spec, QObject
m_notify = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);
connect(m_notify, SIGNAL(activated(int)), this, SLOT(readData()));
} else {
qWarning("Cannot open input device '%s': %s", qPrintable(dev), strerror(errno));
qErrnoWarning(errno, "Cannot open input device %s", qPrintable(dev));
return;
}
@ -220,6 +220,12 @@ QEvdevTouchScreenHandler::QEvdevTouchScreenHandler(const QString &spec, QObject
qDebug("device name: %s", name);
}
bool grabSuccess = !ioctl(m_fd, EVIOCGRAB, (void *) 1);
if (grabSuccess)
ioctl(m_fd, EVIOCGRAB, (void *) 0);
else
qWarning("ERROR: The device is grabbed by another process. No events will be read.");
#ifdef USE_MTDEV
const char *mtdevStr = "(mtdev)";
d->m_typeB = true;