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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* v4l2_compat_manager.cpp - V4L2 compatibility manager
*/
#include "v4l2_compat_manager.h"
#include <dlfcn.h>
#include <fcntl.h>
#include <map>
#include <stdarg.h>
#include <string.h>
#include <sys/eventfd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <unistd.h>
#include <libcamera/camera.h>
#include <libcamera/camera_manager.h>
#include "log.h"
using namespace libcamera;
LOG_DEFINE_CATEGORY(V4L2Compat)
namespace {
template<typename T>
void get_symbol(T &func, const char *name)
{
func = reinterpret_cast<T>(dlsym(RTLD_NEXT, name));
}
} /* namespace */
V4L2CompatManager::V4L2CompatManager()
: cm_(nullptr), initialized_(false)
{
get_symbol(fops_.openat, "openat");
get_symbol(fops_.dup, "dup");
get_symbol(fops_.close, "close");
get_symbol(fops_.ioctl, "ioctl");
get_symbol(fops_.mmap, "mmap");
get_symbol(fops_.munmap, "munmap");
}
V4L2CompatManager::~V4L2CompatManager()
{
devices_.clear();
mmaps_.clear();
if (isRunning()) {
exit(0);
/* \todo Wait with a timeout, just in case. */
wait();
}
}
int V4L2CompatManager::init()
{
start();
MutexLocker locker(mutex_);
cv_.wait(locker, [&] { return initialized_; });
return 0;
}
void V4L2CompatManager::run()
{
cm_ = new CameraManager();
int ret = cm_->start();
if (ret) {
LOG(V4L2Compat, Error) << "Failed to start camera manager: "
<< strerror(-ret);
return;
}
LOG(V4L2Compat, Debug) << "Started camera manager";
/*
* For each Camera registered in the system, a V4L2CameraProxy gets
* created here to wrap a camera device.
*/
unsigned int index = 0;
for (auto &camera : cm_->cameras()) {
V4L2CameraProxy *proxy = new V4L2CameraProxy(index, camera);
proxies_.emplace_back(proxy);
++index;
}
/*
* libcamera has been initialized. Unlock the init() caller as we're
* now ready to handle calls from the framework.
*/
mutex_.lock();
initialized_ = true;
mutex_.unlock();
cv_.notify_one();
/* Now start processing events and messages. */
exec();
proxies_.clear();
cm_->stop();
delete cm_;
cm_ = nullptr;
}
V4L2CompatManager *V4L2CompatManager::instance()
{
static V4L2CompatManager instance;
return &instance;
}
V4L2CameraProxy *V4L2CompatManager::getProxy(int fd)
{
auto device = devices_.find(fd);
if (device == devices_.end())
return nullptr;
return device->second;
}
int V4L2CompatManager::getCameraIndex(int fd)
{
struct stat statbuf;
int ret = fstat(fd, &statbuf);
if (ret < 0)
return -1;
std::shared_ptr<Camera> target = cm_->get(statbuf.st_rdev);
if (!target)
return -1;
unsigned int index = 0;
for (auto &camera : cm_->cameras()) {
if (camera == target)
return index;
++index;
}
return -1;
}
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