Rk3588 Android12 AIDL 开发

AIDL (Android Interface Definition Language) 和 HIDL (HAL Interface Definition Language) 都是 Android 系统中用于定义接口的工具，但它们有不同的用途和特性。

AIDL (Android Interface Definition Language)

1. 用途：

   • 主要用于应用程序之间的进程间通信 (IPC)。
   • 适用于定义应用程序组件（如 Activity 和 Service）之间的接口。

HIDL (HAL Interface Definition Language)

1. 用途：

   • 主要用于定义硬件抽象层 (HAL) 接口。
   • 适用于访问底层硬件功能，如摄像头、传感器等。

未来趋势

从 Android 13 开始，HIDL 已被弃用，建议使用 AIDL 来实现 HAL 接口⁴。这意味着未来的 Android 版本将更多地依赖 AIDL 来实现硬件抽象层的接口。

本文主要记录自己实现一个AIDL的过程

主要的架构逻辑

1.使能hidl-gen工具

source build/envsetup.sh
lunch rk3588_s-userdebug
make hidl-gen

2.建立自己的AIDL ,test目录 和ITest.hal,ITestWarpper.hal

1.mkdir vendor/rockchip/hardware/interfaces/test
2.mkdir vendor/rockchip/hardware/interfaces/test/1.03.新建ITest.hal文件
//vendor/rockchip/hardware/interfaces/test/1.0/ITest.hal
package rockchip.hardware.test@1.0;
import ITestWarpper;interface ITest
{setTestWarpper(ITestWarpper testWarpper);GetString()generates (string printString);
};4.新建ITestWarpper.hal文件 用于数据传递
//vendor/rockchip/hardware/interfaces/test/1.0/ITestWarpper.hal
package rockchip.hardware.test@1.0;
interface ITestWarpper
{GetString()generates (string printString);
};

生成编译文件vendor/rockchip/hardware/interfaces/test/1.0/Android.bp  

 do_makefiles_update rockchip.hardware:vendor/rockchip/hardware android.hardware:hardware/interfaces android.hidl:system/libhidl/transport

AIDL 的没有返回值都是VOID ，出参都是 generates (string printString);实现，类似C++的别名功能

生成对应的CPP和头文件

1.hidl-gen -o vendor/rockchip/hardware/test/1.0/defualt -Lc++-impl -rrockchip.hardware:vendor/rockchip/hardware -randroid.hidl:system/libhidl/transport rockchip.hardware  //生成C++ 和 H2.hidl-gen -o vendor/rockchip/hardware/test/1.0/defualt -Landroidbp-impl -rrockchip.hardware:vendor/rockchip/hardware/ -randroid.hidl:system/libhidl/transport rockchip.hardware  //生成Android.dp在defult 目录下生成对应的cpp文件和头文件,Android.bp

也可以使用我写的脚本生成对应的文件
./generate-source2.sh vendor/rockchip/hardware/interfaces/ test rockchip.hardware 

#! /bin/bash
# v1.0if [ -z $1 ]; thenecho "Please input path "exit 1
elseLOC=$1
fiif [ -z $2 ]; thenecho "Please input module name"exit 1
elseMODULE=$2
fiif [ -z $3 ]; thenecho "Please input package head"exit 1
elsePACKAGE_HEAD=$3
fiPACKAGE=$PACKAGE_HEAD.$MODULE@1.0
echo "You package is: $PACKAGE"hidl-gen -o $LOC/$MODULE/1.0/defualt -Lc++-impl -r$PACKAGE_HEAD:$LOC \-randroid.hidl:system/libhidl/transport $PACKAGE
hidl-gen -o $LOC/$MODULE/1.0/defualt -Landroidbp-impl -r$PACKAGE_HEAD:$LOC \-randroid.hidl:system/libhidl/transport $PACKAGE

修改Test.cpp Test.h

// FIXME: your file license if you have one#include "Test.h"
#include "log/log.h"
#define LOG_TAG "test1.0"
namespace rockchip::hardware::test::implementation {
sp<::rockchip::hardware::test::V1_0::ITestWarpper> mTestWarpper = nullptr;
hidl_string mDeviceId;
// Methods from ::rockchip::hardware::test::V1_0::ITest follow.
Return<void> Test::setTestWarpper(const sp<::rockchip::hardware::test::V1_0::ITestWarpper>& testWarpper) {// TODO implementmTestWarpper = testWarpper;return Void();
}Test::Test(){ALOGD("@%s.",__FUNCTION__);
}
Test::~Test(){ALOGD("@%s",__FUNCTION__);
}
V1_0::ITest* HIDL_FETCH_ITest(const char* /* name */) {ALOGD("@%s",__FUNCTION__);return new Test();
}
// [&](const ::android::hardware::hidl_string &id
Return<void> Test::GetString(GetString_cb _hidl_cb) {ALOGD("@%s,mDeviceId：%s",__FUNCTION__,mDeviceId.c_str());// TODO implementif(mTestWarpper!=nullptr){mTestWarpper->GetString([&](const ::android::hardware::hidl_string &id){ALOGD("@%s,GetString mDeviceId：%s",__FUNCTION__,id.c_str());_hidl_cb(id);});}return Void();
}// Methods from ::android::hidl::base::V1_0::IBase follow.//ITest* HIDL_FETCH_ITest(const char* /* name */) {//return new Test();
//}
//
}  // namespace rockchip::hardware::test::implementation

// FIXME: your file license if you have one#pragma once#include <rockchip/hardware/test/1.0/ITest.h>
#include <hidl/MQDescriptor.h>
#include <hidl/Status.h>namespace rockchip::hardware::test::implementation {using ::android::hardware::hidl_array;
using ::android::hardware::hidl_memory;
using ::android::hardware::hidl_string;
using ::android::hardware::hidl_vec;
using ::android::hardware::Return;
using ::android::hardware::Void;
using ::android::sp;struct Test : public V1_0::ITest {// Methods from ::rockchip::hardware::test::V1_0::ITest follow.Return<void> setTestWarpper(const sp<::rockchip::hardware::test::V1_0::ITestWarpper>& testWarpper) override;Return<void> GetString(GetString_cb _hidl_cb) override;Test();~Test();// Methods from ::android::hidl::base::V1_0::IBase follow.};// FIXME: most likely delete, this is only for passthrough implementations
extern "C" V1_0::ITest* HIDL_FETCH_ITest(const char* name);}  // namespace rockchip::hardware::test::implementation

添加一个开机服务 test/1.0/defualt下添加rc 和 xml文件和service.cpp

vendor/rockchip/hardware/interfaces/test/1.0/defualt/[e-mail]
service test_server /vendor/bin/hw/rockchip.hardware.test@1.0-serviceclass haluser systemgroup systemvendor/rockchip/hardware/interfaces/test/1.0/defualt/[e-mail]
<manifest version="1.0" type="device"><hal format="hidl"><name>rockchip.hardware.test</name><transport>hwbinder</transport><version>1.0</version><interface><name>ITest</name><instance>default</instance></interface></hal>
</manifest>vendor/rockchip/hardware/interfaces/test/1.0/defualt/service.cpp
#define LOG_TAG "rockchip.hardware.test@1.0-service"#include <rockchip/hardware/test/1.0/ITest.h>
#include <hidl/LegacySupport.h>
#include <binder/ProcessState.h>using rockchip::hardware::test::V1_0::ITest;
using android::hardware::defaultPassthroughServiceImplementation;
using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;
using android::sp;int main() {android::ProcessState::initWithDriver("/dev/vndbinder");return defaultPassthroughServiceImplementation<ITest>("default", /*maxThreads*/ 6);
}

修改test/1.0/defualt/Android.dp

// FIXME: your file license if you have one
//生成一个AIDL so
cc_library_shared {// FIXME: this should only be -impl for a passthrough hal.// In most cases, to convert this to a binderized implementation, you should:// - change '-impl' to '-service' here and make it a cc_binary instead of a//   cc_library_shared.// - add a *.rc file for this module.// - delete HIDL_FETCH_I* functions.// - call configureRpcThreadpool and registerAsService on the instance.// You may also want to append '-impl/-service' with a specific identifier like// '-vendor' or '-<hardware identifier>' etc to distinguish it.name: "rockchip.hardware.test@1.0-impl",relative_install_path: "hw",// FIXME: this should be 'vendor: true' for modules that will eventually be// on AOSP.proprietary: true,srcs: ["Test.cpp","TestWarpper.cpp",],shared_libs: ["libhidlbase","libutils","liblog","rockchip.hardware.test@1.0",],
}
//生成一个服务进程cc_binary {name: "rockchip.hardware.test@1.0-service",init_rc: ["[e-mail]"],vintf_fragments: ["[e-mail]"],defaults: ["hidl_defaults"],proprietary: true,relative_install_path: "hw",srcs: ["service.cpp",],cflags: ["-Werror", "-Wno-unused-parameter"],shared_libs: ["liblog","libhardware","libhidlbase","libutils","libcutils","rockchip.hardware.test@1.0","libbinder","libhidlmemory",],
}

device 下根据自己的代码加入编译
PRODUCT_PACKAGES += \   rockchip.hardware.test@1.0-service \rockchip.hardware.test@1.0-impl

到这里我们的AIDL添加结束

二.修改系统te，不然服务跑不起来

添加文件device\rockchip\common\manifests\frameworks\[e-mail]
<compatibility-matrix version="1.0" type="framework"><hal format="hidl" optional="true"><name>rockchip.hardware.test</name><version>1.0</version><interface><name>ITest</name><instance>default</instance></interface></hal>
</compatibility-matrix>添加文件device\rockchip\common\sepolicy\vendor\hal_test.te
type hal_test_default, domain;
type hal_test_default_exec, exec_type, vendor_file_type, file_type;init_daemon_domain(hal_test_default)allow hal_test_default device:dir { read open};
allow hal_test_default camera_device:chr_file{ read  write open ioctl };
allow hal_test_default vndbinder_device:chr_file { read write open ioctl map};
allow hal_test_default hidl_base_hwservice:hwservice_manager add;
allow hal_test_default hal_test_hwservice:hwservice_manager {add find};
allow system_app hal_test_hwservice:hwservice_manager { find };
binder_call(system_app, hal_test_default)
binder_call(hal_test_default, system_app)
#binder_call(hal_test_default, platform_app)
binder_call(hal_test_default, hwservicemanager)
#binder_call(hal_test_default, hal_camera_default)
# Client
#allow cameraserver hal_test_hwservice:hwservice_manager { find };
#allow hal_camera_default hal_test_hwservice:hwservice_manager { find };
get_prop(hal_test_default, hwservicemanager_prop)修改device\rockchip\common\sepolicy\vendor\hwservice_contexts
rockchip.hardware.tv.input::ITvInput                   u:object_r:hal_tv_input_hwservice:s0
+ rockchip.hardware.test::ITest                  u:object_r:hal_test_hwservice:s0修改device\rockchip\common\sepolicy\vendor\hwservice.te
+type hal_test_hwservice, hwservice_manager_type;

三。写一个测试demo

添加cpp和h 生成一个so 

//添加packages/apps/libtest_bridge/data_bridge.h
// #include <jni.h>
#include <functional>
#include <string>
#include <time.h>void init();
void deinit();//添加packages/apps/libtest_bridge/data_bridge.cpp
#define APK_VERSION	"V1.3"
#define LOG_TAG "test_bridge"
//#define LOG_NDEBUG 0#include <utils/Log.h>
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <utils/Log.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/videodev2.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <linux/v4l2-subdev.h>#include "data_bridge.h"#include <ui/Fence.h>
#include <ui/GraphicBufferMapper.h>
#include <ui/GraphicBuffer.h>
#include <ui/Rect.h>#include <utils/Singleton.h>#define VIRTUAL_CAMERA
#define RGA_PROC #include <android/hardware_buffer_jni.h>
#include <vndk/hardware_buffer.h>#include <condition_variable>#ifdef RGA_PROC
#include <RockchipRga.h>
#include <im2d_api/im2d.h>
#include "im2d_api/im2d.hpp"
#include "im2d_api/im2d_common.h"
#endif#define LOGE(msg,...)   ALOGE("%s(%d): " msg ,__FUNCTION__,__LINE__,##__VA_ARGS__)
#define LOGD(msg,...)   ALOGD("%s(%d): " msg ,__FUNCTION__,__LINE__,##__VA_ARGS__)
#define LOGV(msg,...)   ALOGV("%s(%d): " msg ,__FUNCTION__,__LINE__,##__VA_ARGS__)using namespace std;
using namespace android;
#include <rockchip/hardware/test/1.0/ITest.h>
class FrameWarpperImp :public rockchip::hardware::test::V1_0::ITestWarpper{public:android::hardware::Return<void> GetString(GetString_cb _hidl_cb) {// TODO implement::android::hardware::hidl_string deviceId = "hellow world";_hidl_cb(deviceId);return android::hardware::Void();}~FrameWarpperImp(){ALOGD("%s",__FUNCTION__);}FrameWarpperImp(){ALOGD("%s",__FUNCTION__);}
};
FrameWarpperImp *frameWarpperImp;
void init()
{::android::hardware::hidl_string testId;ALOGD("%s",__FUNCTION__);android::sp<rockchip::hardware::test::V1_0::ITest> client = rockchip::hardware::test::V1_0::ITest::getService();if(client.get()!= nullptr){        if (frameWarpperImp != nullptr){client->setTestWarpper(nullptr);frameWarpperImp = nullptr;}        frameWarpperImp = new FrameWarpperImp();ALOGD("setFrameDecorator");client->setTestWarpper(frameWarpperImp);client->GetString([&](const ::android::hardware::hidl_string &id){testId = id;ALOGD("setFrameDecorator%s",testId.c_str());});}
}
void deinit(){ALOGD("%s",__FUNCTION__);android::sp<rockchip::hardware::test::V1_0::ITest> client = rockchip::hardware::test::V1_0::ITest::getService();ALOGE("client.get():%p",client.get());if(client.get()!= nullptr){ALOGD("setFrameDecorator nullptr");client->setTestWarpper(nullptr);//delete frameWarpperImp ;frameWarpperImp = nullptr;}
}

packages/apps/libtest_bridge/Android.bp

//生成一个libtest_bridge.so
cc_library_shared {name: "libtest_bridge",srcs: ["data_bridge.cpp"],header_libs: ["jni_headers",],include_dirs: ["hardware/rockchip/librga",],shared_libs: ["libbase","libandroid","liblog","libutils","libcutils","libnativehelper","libhidlbase","libui","librga",
//rga_proc        "librga","rockchip.hardware.test@1.0",],cflags: ["-Wall","-Wno-error","-Wextra","-Wno-unused-parameter",],sanitize: {scs: true,},
}
ndk_library {name: "libtest_bridge",symbol_file: "libtest_bridge.map.txt",first_version: "30",
}
prebuilt_etc {name: "public.libtest_bridge",src: "public.libtest_bridge.txt",filename_from_src: true,
}//生成一个可执行文件test1.0_service
cc_binary {name: "test1.0_service",proprietary: true,relative_install_path: "hw",srcs: ["service.cpp",],defaults: ["hidl_defaults"],vendor: true,sdk_version: "current",cflags: ["-Wall","-Wno-error","-Wextra","-Wno-unused-parameter",],shared_libs: ["liblog","libtest_bridge",],
}

添加文件packages\apps\libtest_bridge\libtest_bridge.map.txt
LIBDATA_BRIDGE {global:init;local:*;
};添加文件packages\apps\libtest_bridge\public.libtest_bridge.txt
libtest_bridge.so nopreload添加文件packages\apps\libtest_bridge\service.cpp
#define LOG_TAG "rockchip.hardware.test@1.0-service"
#include "data_bridge.h"int main() {init();
}

编译完成后将系统的test1.0_service 推到 data/loal/tmp

执行./test1.0_service 

09-05 07:08:06.633  2892  2892 D data_bridge: init
09-05 07:08:06.634  2892  2892 D data_bridge: FrameWarpperImp
09-05 07:08:06.634  2892  2892 D data_bridge: setFrameDecorator
09-05 07:08:06.635   454   454 D test1.0 : @GetString,mDeviceId：
09-05 07:08:06.635   454   454 D test1.0 : @operator(),GetString mDeviceId：
09-05 07:08:06.636  2892  2892 D data_bridge: setFrameDecoratorhellow world

本文章只做自己学习记录