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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* camera_hal_manager.cpp - libcamera Android Camera Manager
*/
#include "camera_hal_manager.h"
#include <libcamera/camera.h>
#include "log.h"
#include "camera_device.h"
#include "camera_proxy.h"
using namespace libcamera;
LOG_DECLARE_CATEGORY(HAL);
/*
* \class CameraHalManager
*
* The HAL camera manager is initializated at camera_module_t 'hal_init()' time
* and spawns its own thread where libcamera related events are dispatched to.
* It wraps the libcamera CameraManager operations and provides helpers for the
* camera_module_t operations, to retrieve the number of cameras in the system,
* their static information and to open and close camera devices.
*/
int CameraHalManager::init()
{
/*
* Start the camera HAL manager thread and wait until its
* initialisation completes to be fully operational before
* receiving calls from the camera stack.
*/
start();
MutexLocker locker(mutex_);
cv_.wait(locker);
return 0;
}
void CameraHalManager::run()
{
/*
* All the libcamera components must be initialised here, in
* order to bind them to the camera HAL manager thread that
* executes the event dispatcher.
*/
cameraManager_ = libcamera::CameraManager::instance();
int ret = cameraManager_->start();
if (ret) {
LOG(HAL, Error) << "Failed to start camera manager: "
<< strerror(-ret);
return;
}
/*
* For each Camera registered in the system, a CameraProxy
* gets created here to wraps a camera device.
*
* \todo Support camera hotplug.
*/
unsigned int index = 0;
for (auto &camera : cameraManager_->cameras()) {
CameraProxy *proxy = new CameraProxy(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.
*/
cv_.notify_one();
/* Now start processing events and messages. */
exec();
}
CameraProxy *CameraHalManager::open(unsigned int id,
const hw_module_t *hardwareModule)
{
if (id < 0 || id >= numCameras()) {
LOG(HAL, Error) << "Invalid camera id '" << id << "'";
return nullptr;
}
CameraProxy *proxy = proxies_[id].get();
if (proxy->open(hardwareModule))
return nullptr;
LOG(HAL, Info) << "Open camera '" << id << "'";
return proxy;
}
int CameraHalManager::close(CameraProxy *proxy)
{
proxy->close();
LOG(HAL, Info) << "Close camera '" << proxy->id() << "'";
return 0;
}
unsigned int CameraHalManager::numCameras() const
{
return cameraManager_->cameras().size();
}
int CameraHalManager::getCameraInfo(int id, struct camera_info *info)
{
if (!info)
return -EINVAL;
if (id >= numCameras() || id < 0) {
LOG(HAL, Error) << "Invalid camera id '" << id << "'";
return -EINVAL;
}
CameraProxy *proxy = proxies_[id].get();
/* \todo Get these info dynamically inspecting the camera module. */
info->facing = id ? CAMERA_FACING_FRONT : CAMERA_FACING_BACK;
info->orientation = 0;
info->device_version = 0;
info->resource_cost = 0;
info->static_camera_characteristics = proxy->getStaticMetadata();
info->conflicting_devices = nullptr;
info->conflicting_devices_length = 0;
return 0;
}
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