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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2020, Umang Jain <email@uajain.com>
*
* hotplug-cameras.cpp - Test cameraAdded/cameraRemoved signals in CameraManager
*/
#include <dirent.h>
#include <fstream>
#include <iostream>
#include <string.h>
#include <unistd.h>
#include <libcamera/camera.h>
#include <libcamera/camera_manager.h>
#include <libcamera/base/event_dispatcher.h>
#include <libcamera/base/file.h>
#include <libcamera/base/thread.h>
#include <libcamera/base/timer.h>
#include "test.h"
using namespace libcamera;
class HotplugTest : public Test
{
protected:
void cameraAddedHandler([[maybe_unused]] std::shared_ptr<Camera> cam)
{
cameraAdded_ = true;
}
void cameraRemovedHandler([[maybe_unused]] std::shared_ptr<Camera> cam)
{
cameraRemoved_ = true;
}
int init()
{
if (!File::exists("/sys/module/uvcvideo")) {
std::cout << "uvcvideo driver is not loaded, skipping" << std::endl;
return TestSkip;
}
if (geteuid() != 0) {
std::cout << "This test requires root permissions, skipping" << std::endl;
return TestSkip;
}
cm_ = new CameraManager();
if (cm_->start()) {
std::cout << "Failed to start camera manager" << std::endl;
return TestFail;
}
cameraAdded_ = false;
cameraRemoved_ = false;
cm_->cameraAdded.connect(this, &HotplugTest::cameraAddedHandler);
cm_->cameraRemoved.connect(this, &HotplugTest::cameraRemovedHandler);
return 0;
}
int run()
{
DIR *dir;
struct dirent *dirent;
std::string uvcDeviceDir;
dir = opendir(uvcDriverDir_.c_str());
/* Find a UVC device directory, which we can bind/unbind. */
while ((dirent = readdir(dir)) != nullptr) {
if (!File::exists(uvcDriverDir_ + dirent->d_name + "/video4linux"))
continue;
uvcDeviceDir = dirent->d_name;
break;
}
closedir(dir);
/* If no UVC device found, skip the test. */
if (uvcDeviceDir.empty())
return TestSkip;
/* Unbind a camera and process events. */
std::ofstream(uvcDriverDir_ + "unbind", std::ios::binary)
<< uvcDeviceDir;
Timer timer;
timer.start(1000);
while (timer.isRunning() && !cameraRemoved_)
Thread::current()->eventDispatcher()->processEvents();
if (!cameraRemoved_) {
std::cout << "Camera unplug not detected" << std::endl;
return TestFail;
}
/* Bind the camera again and process events. */
std::ofstream(uvcDriverDir_ + "bind", std::ios::binary)
<< uvcDeviceDir;
timer.start(1000);
while (timer.isRunning() && !cameraAdded_)
Thread::current()->eventDispatcher()->processEvents();
if (!cameraAdded_) {
std::cout << "Camera plug not detected" << std::endl;
return TestFail;
}
return TestPass;
}
void cleanup()
{
cm_->stop();
delete cm_;
}
private:
CameraManager *cm_;
static const std::string uvcDriverDir_;
bool cameraRemoved_;
bool cameraAdded_;
};
const std::string HotplugTest::uvcDriverDir_ = "/sys/bus/usb/drivers/uvcvideo/";
TEST_REGISTER(HotplugTest)
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