services/core/jni/com_android_server_hdmi_HdmiCecController.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2014 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_TAG "HdmiCecControllerJni"

 #define LOG_NDEBUG 1

 #include <JNIHelp.h>
 #include <ScopedPrimitiveArray.h>

 #include <cstring>

 #include <android_os_MessageQueue.h>
 #include <android_runtime/AndroidRuntime.h>
 #include <android_runtime/Log.h>
 #include <hardware/hdmi_cec.h>
 #include <sys/param.h>
 #include <utils/Looper.h>
 #include <utils/RefBase.h>

 namespace android {

 static struct {
     jmethodID handleIncomingCecCommand;
     jmethodID handleHotplug;
 } gHdmiCecControllerClassInfo;

 class HdmiCecController {
 public:
     HdmiCecController(hdmi_cec_device_t* device, jobject callbacksObj,
             const sp<Looper>& looper);

     void init();

     // Send message to other device. Note that it runs in IO thread.
     int sendMessage(const cec_message_t& message);
     // Add a logical address to device.
     int addLogicalAddress(cec_logical_address_t address);
     // Clear all logical address registered to the device.
     void clearLogicaladdress();
     // Get physical address of device.
     int getPhysicalAddress();
     // Get CEC version from driver.
     int getVersion();
     // Get vendor id used for vendor command.
     uint32_t getVendorId();
     // Get Port information on all the HDMI ports.
     jobjectArray getPortInfos();
     // Set a flag and its value.
     void setOption(int flag, int value);
     // Set audio return channel status.
     void setAudioReturnChannel(int port, bool flag);
     // Whether to hdmi device is connected to the given port.
     bool isConnected(int port);

     jobject getCallbacksObj() const {
         return mCallbacksObj;
     }

 private:
     static const int INVALID_PHYSICAL_ADDRESS = 0xFFFF;
     static void onReceived(const hdmi_event_t* event, void* arg);

     hdmi_cec_device_t* mDevice;
     jobject mCallbacksObj;
     sp<Looper> mLooper;
 };

 // RefBase wrapper for hdmi_event_t. As hdmi_event_t coming from HAL
 // may keep its own lifetime, we need to copy it in order to delegate
 // it to service thread.
 class CecEventWrapper : public LightRefBase<CecEventWrapper> {
 public:
     CecEventWrapper(const hdmi_event_t& event) {
         // Copy message.
         switch (event.type) {
         case HDMI_EVENT_CEC_MESSAGE:
             mEvent.cec.initiator = event.cec.initiator;
             mEvent.cec.destination = event.cec.destination;
             mEvent.cec.length = event.cec.length;
             std::memcpy(mEvent.cec.body, event.cec.body, event.cec.length);
             break;
         case HDMI_EVENT_HOT_PLUG:
             mEvent.hotplug.connected = event.hotplug.connected;
             mEvent.hotplug.port_id = event.hotplug.port_id;
             break;
         default:
             // TODO: add more type whenever new type is introduced.
             break;
         }
     }

     const cec_message_t& cec() const {
         return mEvent.cec;
     }

     const hotplug_event_t& hotplug() const {
         return mEvent.hotplug;
     }

     virtual ~CecEventWrapper() {}

 private:
     hdmi_event_t mEvent;
 };

 // Handler class to delegate incoming message to service thread.
 class HdmiCecEventHandler : public MessageHandler {
 public:
     HdmiCecEventHandler(HdmiCecController* controller, const sp<CecEventWrapper>& event)
         : mController(controller),
           mEventWrapper(event) {
     }

     virtual ~HdmiCecEventHandler() {}

     void handleMessage(const Message& message) {
         switch (message.what) {
         case HDMI_EVENT_CEC_MESSAGE:
             propagateCecCommand(mEventWrapper->cec());
             break;
         case HDMI_EVENT_HOT_PLUG:
             propagateHotplugEvent(mEventWrapper->hotplug());
             break;
         default:
             // TODO: add more type whenever new type is introduced.
             break;
         }
     }

 private:
     // Propagate the message up to Java layer.
     void propagateCecCommand(const cec_message_t& message) {
         jint srcAddr = message.initiator;
         jint dstAddr = message.destination;
         JNIEnv* env = AndroidRuntime::getJNIEnv();
         jbyteArray body = env->NewByteArray(message.length);
         const jbyte* bodyPtr = reinterpret_cast<const jbyte *>(message.body);
         env->SetByteArrayRegion(body, 0, message.length, bodyPtr);

         env->CallVoidMethod(mController->getCallbacksObj(),
                 gHdmiCecControllerClassInfo.handleIncomingCecCommand, srcAddr,
                 dstAddr, body);
         env->DeleteLocalRef(body);

         checkAndClearExceptionFromCallback(env, __FUNCTION__);
     }

     void propagateHotplugEvent(const hotplug_event_t& event) {
         // Note that this method should be called in service thread.
         JNIEnv* env = AndroidRuntime::getJNIEnv();
         jint port = event.port_id;
         jboolean connected = (jboolean) event.connected;
         env->CallVoidMethod(mController->getCallbacksObj(),
                 gHdmiCecControllerClassInfo.handleHotplug, port, connected);

         checkAndClearExceptionFromCallback(env, __FUNCTION__);
     }

     // static
     static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
         if (env->ExceptionCheck()) {
             ALOGE("An exception was thrown by callback '%s'.", methodName);
             LOGE_EX(env);
             env->ExceptionClear();
         }
     }

     HdmiCecController* mController;
     sp<CecEventWrapper> mEventWrapper;
 };

 HdmiCecController::HdmiCecController(hdmi_cec_device_t* device,
         jobject callbacksObj, const sp<Looper>& looper) :
     mDevice(device),
     mCallbacksObj(callbacksObj),
     mLooper(looper) {
 }

 void HdmiCecController::init() {
     mDevice->register_event_callback(mDevice, HdmiCecController::onReceived, this);
 }

 int HdmiCecController::sendMessage(const cec_message_t& message) {
     // TODO: propagate send_message's return value.
     return mDevice->send_message(mDevice, &message);
 }

 int HdmiCecController::addLogicalAddress(cec_logical_address_t address) {
     return mDevice->add_logical_address(mDevice, address);
 }

 void HdmiCecController::clearLogicaladdress() {
     mDevice->clear_logical_address(mDevice);
 }

 int HdmiCecController::getPhysicalAddress() {
     uint16_t addr;
     if (!mDevice->get_physical_address(mDevice, &addr)) {
         return addr;
     }
     return INVALID_PHYSICAL_ADDRESS;
 }

 int HdmiCecController::getVersion() {
     int version = 0;
     mDevice->get_version(mDevice, &version);
     return version;
 }

 uint32_t HdmiCecController::getVendorId() {
     uint32_t vendorId = 0;
     mDevice->get_vendor_id(mDevice, &vendorId);
     return vendorId;
 }

 jobjectArray HdmiCecController::getPortInfos() {
     JNIEnv* env = AndroidRuntime::getJNIEnv();
     jclass hdmiPortInfo = env->FindClass("android/hardware/hdmi/HdmiPortInfo");
     if (hdmiPortInfo == NULL) {
         return NULL;
     }
     jmethodID ctor = env->GetMethodID(hdmiPortInfo, "<init>", "(IIIZZZ)V");
     if (ctor == NULL) {
         return NULL;
     }
     hdmi_port_info* ports;
     int numPorts;
     mDevice->get_port_info(mDevice, &ports, &numPorts);
     jobjectArray res = env->NewObjectArray(numPorts, hdmiPortInfo, NULL);

     // MHL support field will be obtained from MHL HAL. Leave it to false.
     jboolean mhlSupported = (jboolean) 0;
     for (int i = 0; i < numPorts; ++i) {
         hdmi_port_info* info = &ports[i];
         jboolean cecSupported = (jboolean) info->cec_supported;
         jboolean arcSupported = (jboolean) info->arc_supported;
         jobject infoObj = env->NewObject(hdmiPortInfo, ctor, info->port_id, info->type,
                 info->physical_address, cecSupported, mhlSupported, arcSupported);
         env->SetObjectArrayElement(res, i, infoObj);
     }
     return res;
 }

 void HdmiCecController::setOption(int flag, int value) {
     mDevice->set_option(mDevice, flag, value);
 }

 // Set audio return channel status.
   void HdmiCecController::setAudioReturnChannel(int port, bool enabled) {
     mDevice->set_audio_return_channel(mDevice, port, enabled ? 1 : 0);
 }

 // Whether to hdmi device is connected to the given port.
 bool HdmiCecController::isConnected(int port) {
     return mDevice->is_connected(mDevice, port) == HDMI_CONNECTED;
 }

 // static
 void HdmiCecController::onReceived(const hdmi_event_t* event, void* arg) {
     HdmiCecController* controller = static_cast<HdmiCecController*>(arg);
     if (controller == NULL) {
         return;
     }

     sp<CecEventWrapper> spEvent(new CecEventWrapper(*event));
     sp<HdmiCecEventHandler> handler(new HdmiCecEventHandler(controller, spEvent));
     controller->mLooper->sendMessage(handler, event->type);
 }

 //------------------------------------------------------------------------------
 #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
         var = env->GetMethodID(clazz, methodName, methodDescriptor); \
         LOG_FATAL_IF(! var, "Unable to find method " methodName);

 static jlong nativeInit(JNIEnv* env, jclass clazz, jobject callbacksObj,
         jobject messageQueueObj) {
     int err;
     hw_module_t* module;
     err = hw_get_module(HDMI_CEC_HARDWARE_MODULE_ID,
             const_cast<const hw_module_t **>(&module));
     if (err != 0) {
         ALOGE("Error acquiring hardware module: %d", err);
         return 0;
     }

     hw_device_t* device;
     err = module->methods->open(module, HDMI_CEC_HARDWARE_INTERFACE, &device);
     if (err != 0) {
         ALOGE("Error opening hardware module: %d", err);
         return 0;
     }

     sp<MessageQueue> messageQueue =
             android_os_MessageQueue_getMessageQueue(env, messageQueueObj);

     HdmiCecController* controller = new HdmiCecController(
             reinterpret_cast<hdmi_cec_device*>(device),
             env->NewGlobalRef(callbacksObj),
             messageQueue->getLooper());
     controller->init();

     GET_METHOD_ID(gHdmiCecControllerClassInfo.handleIncomingCecCommand, clazz,
             "handleIncomingCecCommand", "(II[B)V");
     GET_METHOD_ID(gHdmiCecControllerClassInfo.handleHotplug, clazz,
             "handleHotplug", "(IZ)V");

     return reinterpret_cast<jlong>(controller);
 }

 static jint nativeSendCecCommand(JNIEnv* env, jclass clazz, jlong controllerPtr,
         jint srcAddr, jint dstAddr, jbyteArray body) {
     cec_message_t message;
     message.initiator = static_cast<cec_logical_address_t>(srcAddr);
     message.destination = static_cast<cec_logical_address_t>(dstAddr);

     jsize len = env->GetArrayLength(body);
     message.length = MIN(len, CEC_MESSAGE_BODY_MAX_LENGTH);
     ScopedByteArrayRO bodyPtr(env, body);
     std::memcpy(message.body, bodyPtr.get(), message.length);

     HdmiCecController* controller =
             reinterpret_cast<HdmiCecController*>(controllerPtr);
     return controller->sendMessage(message);
 }

 static jint nativeAddLogicalAddress(JNIEnv* env, jclass clazz, jlong controllerPtr,
         jint logicalAddress) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     return controller->addLogicalAddress(static_cast<cec_logical_address_t>(logicalAddress));
 }

 static void nativeClearLogicalAddress(JNIEnv* env, jclass clazz, jlong controllerPtr) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     controller->clearLogicaladdress();
 }

 static jint nativeGetPhysicalAddress(JNIEnv* env, jclass clazz, jlong controllerPtr) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     return controller->getPhysicalAddress();
 }

 static jint nativeGetVersion(JNIEnv* env, jclass clazz, jlong controllerPtr) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     return controller->getVersion();
 }

 static jint nativeGetVendorId(JNIEnv* env, jclass clazz, jlong controllerPtr) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     return controller->getVendorId();
 }

 static jobjectArray nativeGetPortInfos(JNIEnv* env, jclass clazz, jlong controllerPtr) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     return controller->getPortInfos();
 }

 static void nativeSetOption(JNIEnv* env, jclass clazz, jlong controllerPtr, jint flag, jint value) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     controller->setOption(flag, value);
 }

 static void nativeSetAudioReturnChannel(JNIEnv* env, jclass clazz, jlong controllerPtr,
         jint port, jboolean enabled) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     controller->setAudioReturnChannel(port, enabled == JNI_TRUE);
 }

 static jboolean nativeIsConnected(JNIEnv* env, jclass clazz, jlong controllerPtr, jint port) {
     HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
     return controller->isConnected(port) ? JNI_TRUE : JNI_FALSE ;
 }

 static const JNINativeMethod sMethods[] = {
     /* name, signature, funcPtr */
     { "nativeInit",
       "(Lcom/android/server/hdmi/HdmiCecController;Landroid/os/MessageQueue;)J",
       (void *) nativeInit },
     { "nativeSendCecCommand", "(JII[B)I", (void *) nativeSendCecCommand },
     { "nativeAddLogicalAddress", "(JI)I", (void *) nativeAddLogicalAddress },
     { "nativeClearLogicalAddress", "(J)V", (void *) nativeClearLogicalAddress },
     { "nativeGetPhysicalAddress", "(J)I", (void *) nativeGetPhysicalAddress },
     { "nativeGetVersion", "(J)I", (void *) nativeGetVersion },
     { "nativeGetVendorId", "(J)I", (void *) nativeGetVendorId },
     { "nativeGetPortInfos",
       "(J)[Landroid/hardware/hdmi/HdmiPortInfo;",
       (void *) nativeGetPortInfos },
     { "nativeSetOption", "(JII)V", (void *) nativeSetOption },
     { "nativeSetAudioReturnChannel", "(JIZ)V", (void *) nativeSetAudioReturnChannel },
     { "nativeIsConnected", "(JI)Z", (void *) nativeIsConnected },
 };

 #define CLASS_PATH "com/android/server/hdmi/HdmiCecController"

 int register_android_server_hdmi_HdmiCecController(JNIEnv* env) {
     int res = jniRegisterNativeMethods(env, CLASS_PATH, sMethods, NELEM(sMethods));
     LOG_FATAL_IF(res < 0, "Unable to register native methods.");
     (void)res; // Don't scream about unused variable in the LOG_NDEBUG case
     return 0;
 }

 }  /* namespace android */
	/*
	* Copyright (C) 2014 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_TAG "HdmiCecControllerJni"

	#define LOG_NDEBUG 1

	#include <JNIHelp.h>
	#include <ScopedPrimitiveArray.h>

	#include <cstring>

	#include <android_os_MessageQueue.h>
	#include <android_runtime/AndroidRuntime.h>
	#include <android_runtime/Log.h>
	#include <hardware/hdmi_cec.h>
	#include <sys/param.h>
	#include <utils/Looper.h>
	#include <utils/RefBase.h>

	namespace android {

	static struct {
	jmethodID handleIncomingCecCommand;
	jmethodID handleHotplug;
	} gHdmiCecControllerClassInfo;

	class HdmiCecController {
	public:
	HdmiCecController(hdmi_cec_device_t* device, jobject callbacksObj,
	const sp<Looper>& looper);

	void init();

	// Send message to other device. Note that it runs in IO thread.
	int sendMessage(const cec_message_t& message);
	// Add a logical address to device.
	int addLogicalAddress(cec_logical_address_t address);
	// Clear all logical address registered to the device.
	void clearLogicaladdress();
	// Get physical address of device.
	int getPhysicalAddress();
	// Get CEC version from driver.
	int getVersion();
	// Get vendor id used for vendor command.
	uint32_t getVendorId();
	// Get Port information on all the HDMI ports.
	jobjectArray getPortInfos();
	// Set a flag and its value.
	void setOption(int flag, int value);
	// Set audio return channel status.
	void setAudioReturnChannel(int port, bool flag);
	// Whether to hdmi device is connected to the given port.
	bool isConnected(int port);

	jobject getCallbacksObj() const {
	return mCallbacksObj;
	}

	private:
	static const int INVALID_PHYSICAL_ADDRESS = 0xFFFF;
	static void onReceived(const hdmi_event_t* event, void* arg);

	hdmi_cec_device_t* mDevice;
	jobject mCallbacksObj;
	sp<Looper> mLooper;
	};

	// RefBase wrapper for hdmi_event_t. As hdmi_event_t coming from HAL
	// may keep its own lifetime, we need to copy it in order to delegate
	// it to service thread.
	class CecEventWrapper : public LightRefBase<CecEventWrapper> {
	public:
	CecEventWrapper(const hdmi_event_t& event) {
	// Copy message.
	switch (event.type) {
	case HDMI_EVENT_CEC_MESSAGE:
	mEvent.cec.initiator = event.cec.initiator;
	mEvent.cec.destination = event.cec.destination;
	mEvent.cec.length = event.cec.length;
	std::memcpy(mEvent.cec.body, event.cec.body, event.cec.length);
	break;
	case HDMI_EVENT_HOT_PLUG:
	mEvent.hotplug.connected = event.hotplug.connected;
	mEvent.hotplug.port_id = event.hotplug.port_id;
	break;
	default:
	// TODO: add more type whenever new type is introduced.
	break;
	}
	}

	const cec_message_t& cec() const {
	return mEvent.cec;
	}

	const hotplug_event_t& hotplug() const {
	return mEvent.hotplug;
	}

	virtual ~CecEventWrapper() {}

	private:
	hdmi_event_t mEvent;
	};

	// Handler class to delegate incoming message to service thread.
	class HdmiCecEventHandler : public MessageHandler {
	public:
	HdmiCecEventHandler(HdmiCecController* controller, const sp<CecEventWrapper>& event)
	: mController(controller),
	mEventWrapper(event) {
	}

	virtual ~HdmiCecEventHandler() {}

	void handleMessage(const Message& message) {
	switch (message.what) {
	case HDMI_EVENT_CEC_MESSAGE:
	propagateCecCommand(mEventWrapper->cec());
	break;
	case HDMI_EVENT_HOT_PLUG:
	propagateHotplugEvent(mEventWrapper->hotplug());
	break;
	default:
	// TODO: add more type whenever new type is introduced.
	break;
	}
	}

	private:
	// Propagate the message up to Java layer.
	void propagateCecCommand(const cec_message_t& message) {
	jint srcAddr = message.initiator;
	jint dstAddr = message.destination;
	JNIEnv* env = AndroidRuntime::getJNIEnv();
	jbyteArray body = env->NewByteArray(message.length);
	const jbyte* bodyPtr = reinterpret_cast<const jbyte *>(message.body);
	env->SetByteArrayRegion(body, 0, message.length, bodyPtr);

	env->CallVoidMethod(mController->getCallbacksObj(),
	gHdmiCecControllerClassInfo.handleIncomingCecCommand, srcAddr,
	dstAddr, body);
	env->DeleteLocalRef(body);

	checkAndClearExceptionFromCallback(env, __FUNCTION__);
	}

	void propagateHotplugEvent(const hotplug_event_t& event) {
	// Note that this method should be called in service thread.
	JNIEnv* env = AndroidRuntime::getJNIEnv();
	jint port = event.port_id;
	jboolean connected = (jboolean) event.connected;
	env->CallVoidMethod(mController->getCallbacksObj(),
	gHdmiCecControllerClassInfo.handleHotplug, port, connected);

	checkAndClearExceptionFromCallback(env, __FUNCTION__);
	}

	// static
	static void checkAndClearExceptionFromCallback(JNIEnv* env, const char* methodName) {
	if (env->ExceptionCheck()) {
	ALOGE("An exception was thrown by callback '%s'.", methodName);
	LOGE_EX(env);
	env->ExceptionClear();
	}
	}

	HdmiCecController* mController;
	sp<CecEventWrapper> mEventWrapper;
	};

	HdmiCecController::HdmiCecController(hdmi_cec_device_t* device,
	jobject callbacksObj, const sp<Looper>& looper) :
	mDevice(device),
	mCallbacksObj(callbacksObj),
	mLooper(looper) {
	}

	void HdmiCecController::init() {
	mDevice->register_event_callback(mDevice, HdmiCecController::onReceived, this);
	}

	int HdmiCecController::sendMessage(const cec_message_t& message) {
	// TODO: propagate send_message's return value.
	return mDevice->send_message(mDevice, &message);
	}

	int HdmiCecController::addLogicalAddress(cec_logical_address_t address) {
	return mDevice->add_logical_address(mDevice, address);
	}

	void HdmiCecController::clearLogicaladdress() {
	mDevice->clear_logical_address(mDevice);
	}

	int HdmiCecController::getPhysicalAddress() {
	uint16_t addr;
	if (!mDevice->get_physical_address(mDevice, &addr)) {
	return addr;
	}
	return INVALID_PHYSICAL_ADDRESS;
	}

	int HdmiCecController::getVersion() {
	int version = 0;
	mDevice->get_version(mDevice, &version);
	return version;
	}

	uint32_t HdmiCecController::getVendorId() {
	uint32_t vendorId = 0;
	mDevice->get_vendor_id(mDevice, &vendorId);
	return vendorId;
	}

	jobjectArray HdmiCecController::getPortInfos() {
	JNIEnv* env = AndroidRuntime::getJNIEnv();
	jclass hdmiPortInfo = env->FindClass("android/hardware/hdmi/HdmiPortInfo");
	if (hdmiPortInfo == NULL) {
	return NULL;
	}
	jmethodID ctor = env->GetMethodID(hdmiPortInfo, "<init>", "(IIIZZZ)V");
	if (ctor == NULL) {
	return NULL;
	}
	hdmi_port_info* ports;
	int numPorts;
	mDevice->get_port_info(mDevice, &ports, &numPorts);
	jobjectArray res = env->NewObjectArray(numPorts, hdmiPortInfo, NULL);

	// MHL support field will be obtained from MHL HAL. Leave it to false.
	jboolean mhlSupported = (jboolean) 0;
	for (int i = 0; i < numPorts; ++i) {
	hdmi_port_info* info = &ports[i];
	jboolean cecSupported = (jboolean) info->cec_supported;
	jboolean arcSupported = (jboolean) info->arc_supported;
	jobject infoObj = env->NewObject(hdmiPortInfo, ctor, info->port_id, info->type,
	info->physical_address, cecSupported, mhlSupported, arcSupported);
	env->SetObjectArrayElement(res, i, infoObj);
	}
	return res;
	}

	void HdmiCecController::setOption(int flag, int value) {
	mDevice->set_option(mDevice, flag, value);
	}

	// Set audio return channel status.
	void HdmiCecController::setAudioReturnChannel(int port, bool enabled) {
	mDevice->set_audio_return_channel(mDevice, port, enabled ? 1 : 0);
	}

	// Whether to hdmi device is connected to the given port.
	bool HdmiCecController::isConnected(int port) {
	return mDevice->is_connected(mDevice, port) == HDMI_CONNECTED;
	}

	// static
	void HdmiCecController::onReceived(const hdmi_event_t* event, void* arg) {
	HdmiCecController* controller = static_cast<HdmiCecController*>(arg);
	if (controller == NULL) {
	return;
	}

	sp<CecEventWrapper> spEvent(new CecEventWrapper(*event));
	sp<HdmiCecEventHandler> handler(new HdmiCecEventHandler(controller, spEvent));
	controller->mLooper->sendMessage(handler, event->type);
	}

	//------------------------------------------------------------------------------
	#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
	var = env->GetMethodID(clazz, methodName, methodDescriptor); \
	LOG_FATAL_IF(! var, "Unable to find method " methodName);

	static jlong nativeInit(JNIEnv* env, jclass clazz, jobject callbacksObj,
	jobject messageQueueObj) {
	int err;
	hw_module_t* module;
	err = hw_get_module(HDMI_CEC_HARDWARE_MODULE_ID,
	const_cast<const hw_module_t **>(&module));
	if (err != 0) {
	ALOGE("Error acquiring hardware module: %d", err);
	return 0;
	}

	hw_device_t* device;
	err = module->methods->open(module, HDMI_CEC_HARDWARE_INTERFACE, &device);
	if (err != 0) {
	ALOGE("Error opening hardware module: %d", err);
	return 0;
	}

	sp<MessageQueue> messageQueue =
	android_os_MessageQueue_getMessageQueue(env, messageQueueObj);

	HdmiCecController* controller = new HdmiCecController(
	reinterpret_cast<hdmi_cec_device*>(device),
	env->NewGlobalRef(callbacksObj),
	messageQueue->getLooper());
	controller->init();

	GET_METHOD_ID(gHdmiCecControllerClassInfo.handleIncomingCecCommand, clazz,
	"handleIncomingCecCommand", "(II[B)V");
	GET_METHOD_ID(gHdmiCecControllerClassInfo.handleHotplug, clazz,
	"handleHotplug", "(IZ)V");

	return reinterpret_cast<jlong>(controller);
	}

	static jint nativeSendCecCommand(JNIEnv* env, jclass clazz, jlong controllerPtr,
	jint srcAddr, jint dstAddr, jbyteArray body) {
	cec_message_t message;
	message.initiator = static_cast<cec_logical_address_t>(srcAddr);
	message.destination = static_cast<cec_logical_address_t>(dstAddr);

	jsize len = env->GetArrayLength(body);
	message.length = MIN(len, CEC_MESSAGE_BODY_MAX_LENGTH);
	ScopedByteArrayRO bodyPtr(env, body);
	std::memcpy(message.body, bodyPtr.get(), message.length);

	HdmiCecController* controller =
	reinterpret_cast<HdmiCecController*>(controllerPtr);
	return controller->sendMessage(message);
	}

	static jint nativeAddLogicalAddress(JNIEnv* env, jclass clazz, jlong controllerPtr,
	jint logicalAddress) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	return controller->addLogicalAddress(static_cast<cec_logical_address_t>(logicalAddress));
	}

	static void nativeClearLogicalAddress(JNIEnv* env, jclass clazz, jlong controllerPtr) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	controller->clearLogicaladdress();
	}

	static jint nativeGetPhysicalAddress(JNIEnv* env, jclass clazz, jlong controllerPtr) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	return controller->getPhysicalAddress();
	}

	static jint nativeGetVersion(JNIEnv* env, jclass clazz, jlong controllerPtr) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	return controller->getVersion();
	}

	static jint nativeGetVendorId(JNIEnv* env, jclass clazz, jlong controllerPtr) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	return controller->getVendorId();
	}

	static jobjectArray nativeGetPortInfos(JNIEnv* env, jclass clazz, jlong controllerPtr) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	return controller->getPortInfos();
	}

	static void nativeSetOption(JNIEnv* env, jclass clazz, jlong controllerPtr, jint flag, jint value) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	controller->setOption(flag, value);
	}

	static void nativeSetAudioReturnChannel(JNIEnv* env, jclass clazz, jlong controllerPtr,
	jint port, jboolean enabled) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	controller->setAudioReturnChannel(port, enabled == JNI_TRUE);
	}

	static jboolean nativeIsConnected(JNIEnv* env, jclass clazz, jlong controllerPtr, jint port) {
	HdmiCecController* controller = reinterpret_cast<HdmiCecController*>(controllerPtr);
	return controller->isConnected(port) ? JNI_TRUE : JNI_FALSE ;
	}

	static const JNINativeMethod sMethods[] = {
	/* name, signature, funcPtr */
	{ "nativeInit",
	"(Lcom/android/server/hdmi/HdmiCecController;Landroid/os/MessageQueue;)J",
	(void *) nativeInit },
	{ "nativeSendCecCommand", "(JII[B)I", (void *) nativeSendCecCommand },
	{ "nativeAddLogicalAddress", "(JI)I", (void *) nativeAddLogicalAddress },
	{ "nativeClearLogicalAddress", "(J)V", (void *) nativeClearLogicalAddress },
	{ "nativeGetPhysicalAddress", "(J)I", (void *) nativeGetPhysicalAddress },
	{ "nativeGetVersion", "(J)I", (void *) nativeGetVersion },
	{ "nativeGetVendorId", "(J)I", (void *) nativeGetVendorId },
	{ "nativeGetPortInfos",
	"(J)[Landroid/hardware/hdmi/HdmiPortInfo;",
	(void *) nativeGetPortInfos },
	{ "nativeSetOption", "(JII)V", (void *) nativeSetOption },
	{ "nativeSetAudioReturnChannel", "(JIZ)V", (void *) nativeSetAudioReturnChannel },
	{ "nativeIsConnected", "(JI)Z", (void *) nativeIsConnected },
	};

	#define CLASS_PATH "com/android/server/hdmi/HdmiCecController"

	int register_android_server_hdmi_HdmiCecController(JNIEnv* env) {
	int res = jniRegisterNativeMethods(env, CLASS_PATH, sMethods, NELEM(sMethods));
	LOG_FATAL_IF(res < 0, "Unable to register native methods.");
	(void)res; // Don't scream about unused variable in the LOG_NDEBUG case
	return 0;
	}

	} /* namespace android */