From c4dfb8030c1f65e925ef2733bfc61fc01fcd80c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20=C5=81o=C5=9B?= <michal.los@siili.com>
Date: Wed, 10 Apr 2024 16:50:32 +0200
Subject: [PATCH] Enable device discovery using evdev on VxWorks

Provide VxWorks-specific implementation of keyboard and mouse device
discovery, and enable usage of evdev on this platform.

Task-number: QTBUG-115777
Change-Id: I9370ac085aa58c72e2d39731b78ebd854f5aad9a
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
---
 src/gui/configure.cmake                       | 10 +++
 .../qdevicediscovery_static.cpp               | 69 ++++++++++++++++++-
 .../input/shared/qevdevutil.cpp               |  8 ++-
 3 files changed, 85 insertions(+), 2 deletions(-)

diff --git a/src/gui/configure.cmake b/src/gui/configure.cmake
index 4a5bc443ec9..db627d7453a 100644
--- a/src/gui/configure.cmake
+++ b/src/gui/configure.cmake
@@ -363,15 +363,25 @@ qt_config_compile_test(evdev
     CODE
 "#if defined(__FreeBSD__)
 #  include <dev/evdev/input.h>
+#elif defined(__VXWORKS__)
+#include <evdevLib.h>
+typedef EV_DEV_EVENT input_event;
 #else
 #  include <linux/input.h>
 #  include <linux/kd.h>
 #endif
 enum {
+#if defined(__VXWORKS__)
+    e1 = EV_DEV_ABS,
+    e2 = EV_DEV_PTR_ABS_X,
+    e3 = EV_DEV_PTR_ABS_Y,
+    e4 = EV_DEV_PTR_BTN_TOUCH,
+#else
     e1 = ABS_PRESSURE,
     e2 = ABS_X,
     e3 = REL_X,
     e4 = SYN_REPORT,
+#endif
 };
 
 int main(void)
diff --git a/src/platformsupport/devicediscovery/qdevicediscovery_static.cpp b/src/platformsupport/devicediscovery/qdevicediscovery_static.cpp
index 03a77aaae7b..963696444b6 100644
--- a/src/platformsupport/devicediscovery/qdevicediscovery_static.cpp
+++ b/src/platformsupport/devicediscovery/qdevicediscovery_static.cpp
@@ -13,6 +13,9 @@
 
 #ifdef Q_OS_FREEBSD
 #include <dev/evdev/input.h>
+#elif defined(Q_OS_VXWORKS)
+#include <evdevLib.h>
+#define ABS_X           EV_DEV_PTR_ABS_X
 #else
 #include <linux/input.h>
 #endif
@@ -40,10 +43,12 @@
 #define LONG_BITS (sizeof(long) * 8 )
 #define LONG_FIELD_SIZE(bits) ((bits / LONG_BITS) + 1)
 
+#if !defined(Q_OS_VXWORKS)
 static bool testBit(long bit, const long *field)
 {
     return (field[bit / LONG_BITS] >> bit % LONG_BITS) & 1;
 }
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -65,6 +70,37 @@ QDeviceDiscoveryStatic::QDeviceDiscoveryStatic(QDeviceTypes types, QObject *pare
 QStringList QDeviceDiscoveryStatic::scanConnectedDevices()
 {
     QStringList devices;
+
+#if defined(Q_OS_VXWORKS)
+
+    QStringList inputDevices;
+    UINT32 devCount = 0;
+    static const char* device = "/input/event";
+    int fd = QT_OPEN(device, O_RDONLY | O_NDELAY, 0);
+    if (fd >= 0) {
+        if (ERROR == ioctl(fd, EV_DEV_IO_GET_DEV_COUNT, (char *)&devCount)) {
+            qWarning() << "DeviceDiscovery cannot open device" << device;
+            return devices;
+        }
+        for (UINT32 i=0; i<devCount; i++)
+            inputDevices << QString::fromLatin1("/input/event%1").arg(i);
+
+    } else {
+        for (int i=0; i<=EV_DEV_DEVICE_MAX; i++)
+            inputDevices << QString::fromLatin1("/input/event%1").arg(i);
+    }
+    QT_CLOSE(fd);
+
+    // check for input devices
+    if (m_types & Device_InputMask) {
+        for (const auto& deviceFile : inputDevices) {
+            if (checkDeviceType(deviceFile))
+                devices << deviceFile;
+        }
+    }
+
+#else
+
     QDir dir;
     dir.setFilter(QDir::System);
 
@@ -92,6 +128,7 @@ QStringList QDeviceDiscoveryStatic::scanConnectedDevices()
 
     qCDebug(lcDD) << "Found matching devices" << devices;
 
+#endif // Q_OS_VXWORKS
     return devices;
 }
 
@@ -99,7 +136,15 @@ bool QDeviceDiscoveryStatic::checkDeviceType(const QString &device)
 {
     int fd = QT_OPEN(device.toLocal8Bit().constData(), O_RDONLY | O_NDELAY, 0);
     if (Q_UNLIKELY(fd == -1)) {
-        qWarning() << "Device discovery cannot open device" << device;
+#if defined(Q_OS_VXWORKS)
+        // This is changed to debug type message due the nature of scanning
+        // and adding new device for VxWorks by getting dev count from
+        // dev /input/event0 which might be already in use
+        qCDebug(lcDD)
+#else
+        qWarning()
+#endif
+        << "Device discovery cannot open device" << device;
         return false;
     }
 
@@ -110,6 +155,27 @@ bool QDeviceDiscoveryStatic::checkDeviceType(const QString &device)
         return true;
     }
 
+#if defined(Q_OS_VXWORKS)
+    UINT32 devCap = 0;
+    if (ERROR != ioctl(fd, EV_DEV_IO_GET_CAP, (char *)&devCap)) {
+        if ((m_types & Device_Keyboard) && (devCap & EV_DEV_KEY)) {
+            if (!(devCap & EV_DEV_REL) && !(devCap & EV_DEV_ABS)) {
+                qCDebug(lcDD) << "DeviceDiscovery found keyboard at" << device;
+                QT_CLOSE(fd);
+                return true;
+            }
+        }
+
+        if (m_types & Device_Mouse) {
+            if ((devCap & EV_DEV_REL) && (devCap & EV_DEV_KEY)) {
+                qCDebug(lcDD) << "DeviceDiscovery found mouse at" << device;
+                QT_CLOSE(fd);
+                return true;
+            }
+        }
+    }
+    QT_CLOSE(fd);
+#else
     long bitsAbs[LONG_FIELD_SIZE(ABS_CNT)];
     long bitsKey[LONG_FIELD_SIZE(KEY_CNT)];
     long bitsRel[LONG_FIELD_SIZE(REL_CNT)];
@@ -162,6 +228,7 @@ bool QDeviceDiscoveryStatic::checkDeviceType(const QString &device)
             return true;
         }
     }
+#endif
 
     return false;
 }
diff --git a/src/platformsupport/input/shared/qevdevutil.cpp b/src/platformsupport/input/shared/qevdevutil.cpp
index c1ebb9ada00..ee43738ea1c 100644
--- a/src/platformsupport/input/shared/qevdevutil.cpp
+++ b/src/platformsupport/input/shared/qevdevutil.cpp
@@ -19,7 +19,13 @@ ParsedSpecification parseSpecification(const QString &specification)
         if (arg.startsWith("/dev/"_L1)) {
             // if device is specified try to use it
             result.devices.append(arg.toString());
-        } else {
+        }
+#ifdef Q_OS_VXWORKS
+        else if (arg.startsWith("/input/"_L1)) {
+            result.devices.append(arg.toString());
+        }
+#endif
+        else {
             // build new specification without /dev/ elements
             result.spec += arg + u':';
         }