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Wed, 06 May 2020 10:33:54.981 +0000 (UTC) From: Umang Jain Date: Wed, 06 May 2020 10:33:55 +0000 (UTC) Message-Id: <20200506103346.3433-5-email@uajain.com> In-Reply-To: <20200506103346.3433-1-email@uajain.com> References: <20200506103346.3433-1-email@uajain.com> Mime-Version: 1.0 X-SG-EID: 1Q40EQ7YGir8a9gjSIAdTjhngY657NMk9ckeo4dbHZDiOpywc/L3L9rFqlwE4KPcYDswUgqLHty1lirORaEnteN0qcmeuvSogZGEEe3BYijD8Pro8oSDTZzlek2qF6WQhMQYR/09D8OsJUPsv5DM7FNqgTy70nLnpX1TmbNZHaeJTM1hdlL+bPmmqOUM8AxYb1XqTt4Wx0PyRnOTAEQt975chNisywfZmwWF640U9fysAUQywHFP9J8VoFnBsgz4 To: libcamera-devel Subject: [libcamera-devel] [PATCH 4/4] tests: Introduce hotplug hot-unplug unit test X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 10:33:57 -0000 Signed-off-by: Umang Jain --- test/hotplug-cameras.cpp | 152 +++++++++++++++++++++++++++++++++++++++ test/meson.build | 1 + 2 files changed, 153 insertions(+) create mode 100644 test/hotplug-cameras.cpp diff --git a/test/hotplug-cameras.cpp b/test/hotplug-cameras.cpp new file mode 100644 index 0000000..7f1e5a5 --- /dev/null +++ b/test/hotplug-cameras.cpp @@ -0,0 +1,152 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020, Umang Jain + * + * hotplug-cameras.cpp - Emulate cameraAdded/cameraRemoved signals in CameraManager + */ + +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include +#include +#include + +#include "file.h" +#include "test.h" +#include "thread.h" + +using namespace std; +using namespace libcamera; + +class HotplugTest : public Test +{ +protected: + void cameraAddedHandler(Camera *cam) + { + cameraAddedPass_ = true; + } + + void cameraRemovedHandler(Camera *cam) + { + cameraRemovedPass_ = 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; + } + + cameraAddedPass_ = false; + cameraRemovedPass_ = false; + + cm_->cameraAdded.connect(this, &HotplugTest::cameraAddedHandler); + cm_->cameraRemoved.connect(this, &HotplugTest::cameraRemovedHandler); + + uvc_toplevel_ = "/sys/module/uvcvideo/drivers/usb:uvcvideo/"; + + return 0; + } + + int run() + { + DIR *dir; + struct dirent *dirent, *dirent2; + std::string uvc_driver_dir; + bool uvc_driver_found = false; + + dir = opendir(uvc_toplevel_.c_str()); + /* Find a UVC device driver symlink, which we can bind/unbind */ + while ((dirent = readdir(dir)) != nullptr) { + if (dirent->d_type != DT_LNK) + continue; + + std::string child_dir = uvc_toplevel_ + dirent->d_name; + DIR *device_driver = opendir(child_dir.c_str()); + while ((dirent2 = readdir(device_driver)) != nullptr) { + if (strncmp(dirent2->d_name, "video4linux", 11) == 0) { + uvc_driver_dir = dirent->d_name; + uvc_driver_found = true; + break; + } + } + closedir(device_driver); + + if (uvc_driver_found) + break; + } + closedir(dir); + + /* If no UVC driver found, skip */ + if (!uvc_driver_found) + return TestSkip; + + /* Unbind a camera, process events */ + int fd1 = open("/sys/module/uvcvideo/drivers/usb:uvcvideo/unbind", O_WRONLY); + write(fd1, uvc_driver_dir.c_str(), uvc_driver_dir.size()); + close(fd1); + Timer timer; + timer.start(1000); + while (timer.isRunning()) + Thread::current()->eventDispatcher()->processEvents(); + + /* \todo: Fix this workaround of stopping and starting the camera-manager. + * We need to do this, so that cm_ release all references to the uvc media symlinks. + */ + cm_->stop(); + if (cm_->start()) { + std::cout << "Failed to restart camera-manager" << std::endl; + return TestFail; + } + + /* Bind the camera again, process events */ + int fd2 = open("/sys/module/uvcvideo/drivers/usb:uvcvideo/bind", O_WRONLY); + write(fd2, uvc_driver_dir.c_str(), uvc_driver_dir.size()); + close(fd2); + + timer.start(1000); + while (timer.isRunning()) + Thread::current()->eventDispatcher()->processEvents(); + + if (cameraAddedPass_ && cameraRemovedPass_) + return TestPass; + else + return TestFail; + } + + void cleanup() + { + cm_->stop(); + delete cm_; + } + +private: + CameraManager *cm_; + std::string uvc_toplevel_; + bool cameraRemovedPass_; + bool cameraAddedPass_; +}; + +TEST_REGISTER(HotplugTest) + diff --git a/test/meson.build b/test/meson.build index 5a45a85..383a7ea 100644 --- a/test/meson.build +++ b/test/meson.build @@ -29,6 +29,7 @@ internal_tests = [ ['file', 'file.cpp'], ['file-descriptor', 'file-descriptor.cpp'], ['message', 'message.cpp'], + ['hotplug-cameras', 'hotplug-cameras.cpp'], ['object', 'object.cpp'], ['object-invoke', 'object-invoke.cpp'], ['signal-threads', 'signal-threads.cpp'],