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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "UsbCameraHAL"
#include <cutils/log.h>
#include <cstdlib>
#include <hardware/camera_common.h>
#include <hardware/hardware.h>
#include "UsbCamera.h"
#include "CameraHAL.h"
/*
* This file serves as the entry point to the HAL. It contains the module
* structure and functions used by the framework to load and interface to this
* HAL, as well as the handles to the individual camera devices.
*/
namespace usb_camera_hal {
static CameraHAL gCameraHAL;
CameraHAL::CameraHAL()
: mCallbacks(NULL) {
// Should not allocate the camera devices for now, as it is unclear if the device is plugged.
// Start hotplug thread
mHotplugThread = new HotplugThread(this);
mHotplugThread->run("usb-camera-hotplug");
}
CameraHAL::~CameraHAL() {
// Stop hotplug thread
{
android::Mutex::Autolock al(mModuleLock);
if (mHotplugThread != NULL) {
mHotplugThread->requestExit();
}
// Delete camera device from mCameras
}
// Joining done without holding mLock, otherwise deadlocks may ensue
// as the threads try to access parent states.
if (mHotplugThread != NULL) {
mHotplugThread->join();
}
delete mHotplugThread;
}
int CameraHAL::getNumberOfCameras() {
android::Mutex::Autolock al(mModuleLock);
ALOGV("%s: %d", __func__, mCameras.size());
return static_cast<int>(mCameras.size());
}
int CameraHAL::getCameraInfo(int id, struct camera_info* info) {
android::Mutex::Autolock al(mModuleLock);
ALOGV("%s: camera id %d: info=%p", __func__, id, info);
if (id < 0 || id >= static_cast<int>(mCameras.size())) {
ALOGE("%s: Invalid camera id %d", __func__, id);
return -ENODEV;
}
return mCameras[id]->getInfo(info);
}
int CameraHAL::setCallbacks(const camera_module_callbacks_t *callbacks) {
ALOGV("%s : callbacks=%p", __func__, callbacks);
mCallbacks = callbacks;
return 0;
}
int CameraHAL::open(const hw_module_t* mod, const char* name, hw_device_t** dev) {
int id;
char *nameEnd;
android::Mutex::Autolock al(mModuleLock);
ALOGV("%s: module=%p, name=%s, device=%p", __func__, mod, name, dev);
if (*name == '\0') {
ALOGE("%s: Invalid camera id name is NULL", __func__);
return -EINVAL;
}
id = strtol(name, &nameEnd, 10);
if (*nameEnd != '\0') {
ALOGE("%s: Invalid camera id name %s", __func__, name);
return -EINVAL;
} else if (id < 0 || id >= static_cast<int>(mCameras.size())) {
ALOGE("%s: Invalid camera id %d", __func__, id);
return -ENODEV;
}
return mCameras[id]->open(mod, dev);
}
extern "C" {
static int get_number_of_cameras() {
return gCameraHAL.getNumberOfCameras();
}
static int get_camera_info(int id, struct camera_info* info) {
return gCameraHAL.getCameraInfo(id, info);
}
static int set_callbacks(const camera_module_callbacks_t *callbacks) {
return gCameraHAL.setCallbacks(callbacks);
}
static int open_dev(const hw_module_t* mod, const char* name, hw_device_t** dev) {
return gCameraHAL.open(mod, name, dev);
}
static hw_module_methods_t gCameraModuleMethods = {
open : open_dev
};
camera_module_t HAL_MODULE_INFO_SYM __attribute__ ((visibility("default"))) = {
common : {
tag : HARDWARE_MODULE_TAG,
module_api_version : CAMERA_MODULE_API_VERSION_2_4,
hal_api_version : HARDWARE_HAL_API_VERSION,
id : CAMERA_HARDWARE_MODULE_ID,
name : "Default USB Camera HAL",
author : "The Android Open Source Project",
methods : &gCameraModuleMethods,
dso : NULL,
reserved : {0},
},
get_number_of_cameras : get_number_of_cameras,
get_camera_info : get_camera_info,
set_callbacks : set_callbacks,
get_vendor_tag_ops : NULL,
open_legacy : NULL,
set_torch_mode : NULL,
reserved : {0},
};
} // extern "C"
} // namespace usb_camera_hal
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