HIDL helloWorld
hidl目录文件总结HIDL添加启动serviceVNDK相关device部分添加selinux权限(补全)调试问题记录权限报错解决方法解决方法该部分修改为 --》添加selinux权限(补全)
client端实现NarutoService端添加selinux策略，（添加）public 目录：private 目录：
校验与修改注意事项
APP实现调用安装Android studio相关工具包项目创建以及相关配置app调用framework代码
调试笔记
hidl目录文件总结
ac8257/hardware/interfaces/naruto/1.0
└── 1.0
├── Android.bp
├── default
│ ├── Android.bp
│ ├── android.hardware.naruto@1.0-service.rc
│ ├── Naruto.cpp
│ ├── Naruto.h
│ └── service.cpp
└── INaruto.hal
ac8257/hardware/interfaces/update-makefiles.sh
build/make/target/product/vndk
├── 28.txt
├── Android.mk
├── current.txt
ac8257/device/autochips/ac8257_demo/manifest.xml
ac8257/device/autochips/ac8257/devices.mk
ac8257/device/autochips/sepolicy/bsp/non_plat
├─── hwservice_contexts
├─── hwservice.te
├─── file_contexts
├─── hal_naruto.te
├─── hwservicemanager.te
├─── system_app.te
├─── platform_app.te
├─── system_server.te
└─── autolog.te
ac8257/device/autochips/ac8257$
├─── device.mk
--client端
frameworks/base/core/java/android/os
├── INarutoEventListener.aidl
├── INarutoService.aidl
├── NarutoEventListener.java
├── NarutoListenerEvent.aidl
├── NarutoListenerEvent.java
└── NarutoManager.java
frameworks/base/Android.bp
frameworks/base/services/core/Android.bp
frameworks/base/services/core/java/com/android/server/naruto
└── NarutoService.java
frameworks/base/ore/java/android/content/Context.java
/frameworks/base/core/java/android/app/SystemServiceRegistry.java
frameworks/base/services/java/com/android/server/SystemServer.java
--给client端添加系统selinux策略
system/sepolicy/public/attributes
system/sepolicy/prebuilts/api/28.0/public/attributes
system/sepolicy/public/service.te
system/sepolicy/prebuilts/api/28.0/public/service.te
system/sepolicy/private/service_context
system/sepolicy/prebuilts/api/28.0/private/service_context
system/sepolicy/prebuilts/api/28.0/private/system_server.te
system/sepolicy/private/system_server.te
systemsepolicy/private/compat/26.0/26.0.ignore.cil
systemsepolicy/prebuilts/api/28.0/private/compat/26.0/26.0.ignore.cil
systemsepolicy/private/compat/27.0/27.0.ignore.cil
systemsepolicy/prebuilts/api/28.0/private/compat/27.0/27.0.ignore.cil
HIDL
#以下所有的naruto全部修改为naruto
#创建目录
mkdir -p hardware/interfaces/naruto/1.0/default
#接着创建接口描述文件INaruto.hal，放在刚才创建的目录中
package android
.hardware
.naruto
@1.0;
interface INaruto{
helloWorld(string name
) generates
(string result
);
};
#执行以下命令
PACKAGE=android.hardware.naruto@1.0
LOC=hardware/interfaces/naruto/1.0/default/
make hidl-gen -j64
hidl-gen -o $LOC -Lc++-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport $PACKAGE
hidl-gen -o $LOC -Landroidbp-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport $PACKAGE
#然后使用脚本来更新Makefile，自动生成Android,mk, Android.bp
# ./hardware/interfaces/update-makefiles.sh
#添加两个空文件
touch hardware/interfaces/naruto/1.0/default/android.hardware.naruto@1.0-service.rc
touch hardware/interfaces/naruto/1.0/default/service.cpp
添加启动service
service naruto_hal_service /vendor/bin/hw/android.hardware.naruto@1.0-service
class hal
user system
group system
#include <android/hardware/naruto/1.0/INaruto.h>
#include <hidl/LegacySupport.h>
#include <android-base/logging.h>
#include <hidl/HidlTransportSupport.h>
#include <hidl/LegacySupport.h>
#include "Naruto.h"
using android
::hardware
::naruto
::V1_0
::INaruto
;
using android
::hardware
::defaultPassthroughServiceImplementation
;
using android
::hardware
::configureRpcThreadpool
;
using android
::hardware
::joinRpcThreadpool
;
using android
::hardware
::naruto
::V1_0
::implementation
::Naruto
;
int main() {
android
::sp
<INaruto
> service
= new Naruto();
configureRpcThreadpool(1, true);
if(android
::OK
!= service
->registerAsService())
{
ALOGI("Naturo registerAsService failure!");
return 1;
}
joinRpcThreadpool();
}
#修改hardware/interfaces/naruto/1.0/default/Android.bp
cc_binary
{
name:
"android.hardware.naruto@1.0-service",
defaults:
["hidl_defaults"],
relative_install_path:
"hw",
vendor: true,
init_rc:
["android.hardware.naruto@1.0-service.rc"],
srcs:
[
"Naruto.cpp",
"service.cpp"
],
shared_libs:
[
"liblog",
"libhidlbase",
"libhidltransport",
"libutils",
"libhardware",
"android.hardware.naruto@1.0",
],
}
其中 android.hardware.naruto@1.0-service.rc 文件会被安装到 /vendor/etc/init/ 目录。
系统启动时会自动加载这个目录下的所有 rc 文件。
#修改完更新一下
./hardware/interfaces/update-makefiles.sh
#修改Test.h和Test.cpp
//hardware/interfaces/naruto/1.0/default/Naruto.h
# ifndef ANDROID_HARDWARE_NARUTO_V1_0_NARUTO_H
# define ANDROID_HARDWARE_NARUTO_V1_0_NARUTO_H
# include <android/hardware/naruto/1.0/INaruto.h>
# include <hidl/MQDescriptor.h>
# include <hidl/Status.h>
namespace android {
namespace hardware {
namespace naruto{
namespace V1_0 {
namespace 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 Naruto: public INaruto{
// Methods from INaruto follow.
Return<void> helloWorld(const hidl_string& name, helloWorld_cb _hidl_cb) override;
// Methods from ::android::hidl::base::V1_0::IBase follow.
};
// FIXME: most likely delete, this is only for passthrough implementations
// extern "C" INaruto* HIDL_FETCH_INaruto(const char* name);
} // namespace implementation
} // namespace V1_0
} // namespace naruto
} // namespace hardware
} // namespace android
# endif // ANDROID_HARDWARE_NARUTO_V1_0_NARUTO_H
#include "Naruto.h"
#include <stdio.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <signal.h>
#include <fcntl.h>
#include <termios.h>
#include <errno.h>
#include <pthread.h>
#include <log/log.h>
#include <error.h>
#include <utils/Mutex.h>
#include <utils/Thread.h>
#include <cutils/properties.h>
#define MY_MISCDEV "/dev/my_miscdev"
namespace android
{
namespace hardware
{
namespace naruto
{
namespace V1_0
{
namespace implementation
{
Return
<void> Naruto
::helloWorld(const hidl_string
& name
, helloWorld_cb _hidl_cb
) {
int fd
= ::open(MY_MISCDEV
, O_WRONLY
);
if (fd
<= 0){
ALOGE("@@Open %s fail. %s", MY_MISCDEV
, strerror(errno
));
}
ALOGE("@@open %s successful.", MY_MISCDEV
);
char setLedOff
[5] = "0 1";
char setLedOn
[5] = "1 1";
int ret
= -1;
int res
= ::strcmp(name
.c_str(),"ON");
if (res
== 0){
ret
= write(fd
, setLedOn
, sizeof(setLedOn
));
}
else {
ret
= write(fd
, setLedOff
, sizeof(setLedOff
));
}
if(ret
<0){
ALOGE("@@Write error at ret :%d, %s.",ret
, MY_MISCDEV
);
}
::close(fd
);
ALOGE("@@File close ret :%d %s.",ret
, MY_MISCDEV
);
char buf
[100];
::memset(buf
, 0x00, 100);
::snprintf(buf
, 100, "Hello World, %s", name
.c_str());
hidl_string
result(buf
);
_hidl_cb(result
);
return Void();
}}
}
}
}
}
#指定目录编译
source ./build/envsetup.sh
lunch 15
#单独编译某个指定的目录
mmm hardware/interfaces/naruto/1.0/default/
VNDK相关
#hash值我没有手动添加，只需修改成一样的内容
#current.txt 记录了所有 hal 接口的 hash 值，
#接口有变化时，同时需要更新 current.txt 中的 hash 值
#在 interfaces 目录下新建 current.txt 文件，随便写个 hash 值
#再执行一遍 update-makefiles.sh，这个时候就会发现提示 hash 值不正确了，
#同时会给出正确的 hash 值，我们把正确的 hash 值替换到 current.txt 即可。
#在build\make\target\product\vndk 里
#28.txt
#current.txt
#添加如下行
VNDK-core: android.hardware.naruto@1.0.so
#添加完后执行更新 update-makefiles.sh
#更新完后执行单独模块编译 mmm /hardware/interfaces/naruto/1.0/
device部分
xx#在vim device/generic/car/common/manifest.xml添加如下，这一行是错的，修改如下路径：
#ac8257/device/autochips/ac8257_demo$ vim manifest.xml
#百度解释：add the code to the manifest.xm 以至于hwservicemanager 查找到指定的hidl service
<hal format="hidl">
<name>android.hardware.naruto
</name>
<transport>hwbinder
</transport>
<version>1.0
</version>
<interface>
<name>INaruto
</name>
<instance>default
</instance>
</interface>
</hal>
xx#在car.mk添加 启动 narutoservice，如下：
#ac8257/device/autochips/ac8257$
#vim devices.mk
PRODUCT_PACKAGES +
= \
……
android.hardware.naruto@1.0-service
#PRODUCT_PACKAGES百度解释如下：
PRODUCT_PACKAGES指定make时需要编译进system中的包，
这部分虽然也生成apk，但用户是删不掉的，
build/target/product/generic.mk中指定android系统自带的应用程序包
PRODUCT_PACKAGES := \
在device/amlogic/c03ref/c03ref.mk中增加芯片原厂的应用程序包
PRODUCT_PACKAGES += \
添加selinux权限(补全)
在ac8257/device/autochips/sepolicy/bsp/non_plat目录做如下修改
android.hardware.naruto::INarutou:object_r:hal_naruto_hwservice:s0
type hal_naruto_hwservice, hwservice_manager_type
;
/
(vendor
|system/vendor
)/bin/hw/android\.hardware\.naruto@1\.0-service u:object_r:hal_naruto_def
type hal_naruto_default, domain
;
type hal_naruto_default_exec, exec_type, vendor_file_type, file_type
;
allow hal_naruto_default sysfs:file rw_file_perms
;
allow hal_naruto_default hwservicemanager_prop:file r_file_perms
;
allow hal_naruto_default hwservicemanager:binder
{ transfer call
};
allow hal_naruto_default system_app:binder
{ call transfer
};
allow hal_naruto_default platform_app:binder
{ call transfer
};
allow hal_naruto_default untrusted_app:binder
{ call transfer
};
allow hal_naruto_default hal_naruto_hwservice:binder call
;
allow hal_naruto_default hal_naruto_hwservice:hwservice_manager
{ add
};
allow hal_naruto_default device:file
{ open read write
};
allow hal_naruto_default device:chr_file
{open
read write
};
allow hal_naruto_default hidl_base_hwservice:hwservice_manager add
;
allow hwservicemanager hal_naruto_default:process getattr
;
allow hwservicemanager hal_naruto_default:binder
{transfer call
};
allow hwservicemanager hal_naruto_default:file r_file_perms
;
allow hwservicemanager hal_naruto_default:dir search
;
allow system_app hal_naruto_hwservice:hwservice_manager
{find
};
allow system_app hal_naruto_default:binder
{call transfer
};
allow platform_app hal_naruto_hwservice:hwservice_manager
{find
};
allow platform_app hal_naruto_default:binder
{call transfer
};
allow system_server hal_naruto_hwservice:hwservice_manager
find;
allow system_server hal_naruto_default:binder
{call transfer
};
PRODUCT_PACKAGES +
= \
libnaruto_jni \
android.hardware.naruto@1.0 \
android.hardware.naruto@1.0-service \
调试问题记录
在编译完成后，烧写到设备中时，还是没有看到有相关的服务存在
这时候应该看下系统启动日志，是否存在报错，执行如下命令：
--查看服务
ps -Af | grep -i "naruto"
echo 0 0 > /dev/my_miscdev
dmesg
#必须要777，app才能正常打开读写操作
chmod 777 /dev/my_miscdev
--看日志
logcat |grep " naruto"
logcat |grep " SystemServer"
发现会报以下权限错误
权限报错
0-30 19:06:34.720 13961 13961 I ps : type=1400 audit(0.0:28357): avc: denied { open } for path="/proc/395/stat" dev="proc" ino=21678 scontext=u:r:autolog:s0 tcontext=u:r:hal_naruto_default:s0 tclass=file permissive=1
10-30 19:06:48.968 14227 14227 I ps : type=1400 audit(0.0:28557): avc: denied { read } for name="stat" dev="proc" ino=21678 scontext=u:r:autolog:s0 tcontext=u:r:hal_naruto_default:s0 tclass=file permissive=1
10-30 19:06:41.828 14059 14059 I ps : type=1400 audit(0.0:28367): avc: denied { getattr } for path="/proc/395" dev="proc" ino=12739 scontext=u:r:autolog:s0 tcontext=u:r:hal_naruto_default:s0 tclass=dir permissive=1
10-30 19:06:41.828 14059 14059 I ps : type=1400 audit(0.0:28368): avc: denied { search } for name="395" dev="proc" ino=12739 scontext=u:r:autolog:s0 tcontext=u:r:hal_naruto_default:s0 tclass=dir permissive=1
10-30 19:06:45.396 14199 14199 I ps : type=1400 audit(0.0:28461): avc: denied { getattr } for path="/proc/395" dev="proc" ino=12739 scontext=u:r:autolog:s0 tcontext=u:r:hal_naruto_default:s0 tclass=dir permissive=1
10-30 19:06:48.968 14227 14227 I ps : type=1400 audit(0.0:28555): avc: denied { getattr } for path="/proc/395" dev="proc" ino=12739 scontext=u:r:autolog:s0 tcontext=u:r:hal_naruto_default:s0 tclass=dir permissive=1
10-30 19:06:48.968 14227 14227 I ps : type=1400 audit(0.0:28556): avc: denied { search } for name="395" dev="proc" ino=12739 scontext=u:r:autolog:s0 tcontext=u:r:hal_naruto_default:s0 tclass=dir permissive=1
#报错格式如下：
avc: denied { 操作权限 } for pid=7201 comm=“进程名” scontext=u:r:源类型:s0 tcontext=u:r:目标类型:s0 tclass=访问类别 permissive=0
解决方法
#找到相关修改权限目录下的 “源类型.te”，进入如下修改
allow 源类型 目标类型:[tclass] { 操作权限 };
allow scontext tcontext:[tclass] { denied: };
allow autolog hal_naruto_default:file { open read };
allow autolog hal_naruto_default:dir { search getattr};
allow autolog hal_naruto_default:file
{ open read };
allow autolog hal_naruto_default:dir
{ search getattr
};
allow hal_naruto_default device:file
{ open read write };
allow hal_naruto_default device:chr_file
{open write
};
解决方法
该部分修改为 --》添加selinux权限(补全)
做完前面的步骤，应该是可以编译成功，并且在设备中看到相关的服务
client端实现
frameworks/base/core/java/android/os里 新建naruto目录
创建INarutoService.aidl
//创建INarutoService .aidl
package android.os.naruto
;
//import android.os.naturo.NarutoEventListener
;
// Declare any non-default types here with
import statements
interface INarutoService
{
String helloWorld
(String str
);
}
// 创建INarutoEventListener.aidl
package android.os.naruto
;
import android.os.naruto.NarutoListenerEvent
;
interface INarutoEventListener
{
void onEvent
(inout NarutoListenerEvent event
);
}
// 创建NarutoListenerEvent.aidl
package android.os.naruto
;
parcelable NarutoListenerEvent
;
package android
.os
.naruto
;
import android
.os
.Parcel
;
import android
.os
.Parcelable
;
public class NarutoListenerEvent implements Parcelable {
private int what
;
private String msg
;
public NarutoListenerEvent(int what
, String msg
) {
this.what
= what
;
this.msg
= msg
;
}
public NarutoListenerEvent(Parcel in
) {
what
= in
.readInt();
msg
= in
.readString();
}
public void setWhat(int what
) {
this.what
= what
;
}
public void setMsg(String msg
) {
this.msg
= msg
;
}
public int getWhat() {
return what
;
}
public String
getMsg() {
return msg
;
}
public static final Creator
<NarutoListenerEvent> CREATOR
= new Creator<NarutoListenerEvent>() {
@Override
public NarutoListenerEvent
createFromParcel(Parcel in
) {
return new NarutoListenerEvent(in
);
}
@Override
public NarutoListenerEvent
[] newArray(int size
) {
return new NarutoListenerEvent[size
];
}
};
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest
, int flags
) {
dest
.writeInt(what
);
dest
.writeString(msg
);
}
public void readFromParcel(Parcel dest
) {
what
= dest
.readInt();
msg
= dest
.readString();
}
}
package android
.os
.naruto
;
import android
.os
.RemoteException
;
import android
.util
.Log
;
public class NarutoManager {
private INarutoService mService
;
public static final String TAG
= "NarutoManager";
public NarutoManager(INarutoService server
) {
Log
.d(TAG
, "NarutoManager: ");
mService
= server
;
}
public String
helloWorld(String str
) {
Log
.d(TAG
, "helloWorld: "+str
);
try {
if (mService
== null
) {
return null
;
}
return mService
.helloWorld(str
);
} catch (RemoteException e
) {
e
.printStackTrace();
}
return "service connect failed";
}
}
package android
.os
.naruto
;
public abstract class NarutoEventListenerextends INarutoEventListener
.Stub
{
}
#frameworks/base/Android.bp里添加
"core/java/android/os/naruto/INarutoEventListener.aidl",
"core/java/android/os/naruto/INarutoService.aidl",
NarutoService端
在frameworks/base/services/core目录下：
Android.bp添加naruto独有类的引用
static_libs:
[
……
"android.hardware.naruto-V1.0-java",
……
],
在目录 aosp\frameworks\base\services\core\java\com\android\server\naruto
package com
.android
.server
.naruto
;
import android
.hardware
.naruto
.V1_0
.INaruto
;
import android
.os
.RemoteException
;
import android
.os
.naruto
.INarutoService
;
import android
.util
.Log
;
import java
.util
.ArrayList
;
public class NarutoService extends INarutoService.Stub {
private String TAG
= "NarutoService";
private INaruto halService
;
public NarutoService(){
try {
halService
= INaruto
.getService();
} catch (RemoteException e
) {
e
.printStackTrace();
}
}
@Override
public String
helloWorld(String str
) throws RemoteException
{
Log
.d(TAG
, "helloWorld: ");
return halService
.helloWorld(str
);
}
}
#在目录aosp\frameworks\base\core\java\android\content\Context.java里添加
public static final String NARUTO_SERVICE
= "naruto";
#在目录\frameworks\base\core\java\android\app
import android
.os
.naruto
.NarutoManager
;
import android
.os
.naruto
.INarutoService
;
registerService(Context
.NARUTO_SERVICE
, NarutoManager
.class,
new CachedServiceFetcher<NarutoManager>(){
@Override
public NarutoManager
createService(ContextImpl ctx
){
IBinder iBinder
= ServiceManager
.getService(Context
.NARUTO_SERVICE
);
if(iBinder
== null
){
return null
;
}
INarutoService service
= INarutoService
.Stub
.asInterface(iBinder
);
return new NarutoManager(service
);
}});
#在目录aosp\frameworks\base\services\java\com\android\server
import com
.android
.server
.naruto
.NarutoService
;
try{
Slog
.i(TAG
, "naruto Service");
ServiceManager
.addService(Context
.NARUTO_SERVICE
, new NarutoService());
}catch(Throwable e
){
reportWtf("start NarutoService", e
);
}
d
添加selinux策略，（添加）
public 目录：
hal_attribute
(naruto
);
hal_client_domain
(system_server, hal_naruto
)
type naruto_service, system_api_service, system_server_service, service_manager_type
;
#将以上修改同步到system/sepolicy/prebuilts/api/28.0/public/
private 目录：
naruto u:object_r:naruto_service:s0
naruto_service
naruto_service
#将以上修改同步到systemsepolicy/prebuilts/api/28.0/private
校验与修改
diff system/sepolicy/prebuilts/api/28.0/private/compat/26.0/26.0.ignore.cil system/sepolicy/private/compat/26.0/26.0.ignore.cil
vim system/sepolicy/private/compat/26.0/26.0.ignore.cil +110
vim system/sepolicy/prebuilts/api/28.0/private/compat/26.0/26.0.ignore.cil +110
diff system/sepolicy/prebuilts/api/28.0/private/compat/27.0/27.0.ignore.cil system/sepolicy/private/compat/27.0/27.0.ignore.cil
vim system/sepolicy/private/compat/27.0/27.0.ignore.cil +95
vim system/sepolicy/prebuilts/api/28.0/private/compat/27.0/27.0.ignore.cil +95
diff system/sepolicy/prebuilts/api/28.0/private/service_contexts system/sepolicy/private/service_contexts
vim system/sepolicy/prebuilts/api/28.0/private/service_contexts +163
vim system/sepolicy/private/service_contexts +163
#编译整个项目
./allmake.sh -c 4G -p ac8257_demo userdebug
编译成功后将镜像烧写到设备上进行测试
使用adb连接设备，进入/vendor/bin/hw/,查看是否有相关的rc文件
使用top命令进行查看相关的服务是否启动成功
使用service list 可查看相关的服务
注意事项
selinux权限相关修改的文件，必须完全相同，否则会报错不可根据自己以为的方式进行修改，否则很容易进入误区service端可先使用mmm对某个项目目录进行编译测试selinux修改的 权限目录的方式目前来说已知的有两种，均可以先尝试一下
APP实现调用
安卓Android studio
编写测试代码
烧录到设备
使用adb进行启动服务，测试是否成功输出hello world.
安装Android studio相关工具包
安装jdk下载安装Android studio手动下载gradle
项目创建以及相关配置
将gradle-6.1.1-all.zip放到一个固定的路径，解压（路径不存在中文）
#修改MyApplication\gradle\wrapper\gradle-wrapper.properties
distributionUrl=file:///C\:/luoyankuan/installer/AndroidStudio/plugins/gradle/gradle-6.1.1-all.zip
app调用framework代码
#不需要导入jar包，直接替换相关的文件接口即可
#C:\Users\yk\AppData\Local\Android\Sdk\platforms\android-30
#\\172.168.0.90\luoyankuan\ac8257\out\target\common\obj\JAVA_LIBRARIES\framework_intermediates
#目录下的classes.jar的相应内容替换到android.jar对应目录下
修改完成即可在app中调用
调试笔记
--获取git下载权限：
ssh-keygen -t rsa -C luoyankuan@flyaudio.cn
--tmux进入保护模式
--克隆服务器代码
git clone ssh://gitolite@172.168.1.115/ac8257Project/ac8257.git
-- 新建一个本地分支，指向origin/master-8257-yige 分支
-- origin分支是远程分支
git checkout -b master-8257-yige origin/master-8257-yige
git checkout -b master-8257-yige-test origin/master-8257-yige
--项目编译 需要好几个小时等待完成
./allmake.sh -c 4G -p ac8257_demo userdebug
--创建网络文件夹位置，便于下载编译后的文件
\\172.168.0.90\luoyankuan
--账号密码
luoyankuan -- lyk
--学习资料共享盘
\\172.168.0.220\shares
借用机车与线材
--查看电脑配置选择硬盘或者选购新电脑
https://item.jd.com/71062921529.html
--方式1，开启蓝牙，切换devices模式：
*
--方式二，使用串口命令方式切换到devices模式
cat /sys/class/dual_role_usb/dual-role-usb20/data_role //usb 口的模式
echo "host" > /sys/class/dual_role_usb/dual-role-usb20/data_role //切换到host模式
echo "device" > /sys/class/dual_role_usb/dual-role-usb20/data_role //切换到devices模式
--cmd打开中使用adb控制系统：
Adb devices
adb root
adb shell
--驱动路径：
\kernel-4.9\drivers\misc\flygpio
--编译驱动的两种方式：
--1，将驱动源码编译进内核，整个系统编译
--2，将驱动单独编译
--修改gpio代码，编译内核模块
--进入源码根目录执行：
source build/envsetup.sh
lunch 15
--编译驱动
mmm kernel-4.9:kernel
--编译内核镜像
make bootimage
--将ac8257/out/target/product/ac8257_demo目录下的boot.img拷贝出来更新
--烧录镜像
--烧录完成后，需要将板子完全断电才能正常启动，包括电源及其他的外部连接线
--生成驱动路径：
\\172.168.0.90\luoyankuan\ac8257\out\target\product\ac8257_demo\obj\KERNEL_OBJ\drivers\misc\simpleDevDriver
--步骤
编写led驱动，驱动设备树相关的不需要修改，直接用
编译驱动
加载驱动
编写测试程序，即打开设备，写入相关值，观察led灯是否亮灭
--设备树路径：
kernel-4.9/arch/arm64/boot/dts/mediatek/ac8257_demo.dts
--屏蔽原有的驱动
--加载自己写的驱动
adb push \\172.168.0.90\luoyankuan\ac8257\out\target\product\ac8257_demo\obj\KERNEL_OBJ\drivers\misc\simpleDevDriver\driver.ko /data/
adb push \\172.168.0.90\luoyankuan\test /data/
--查看系统日志信息
cat /dev/kmesg
/dev/my_miscdev
--将字符串重定向输入到指定文件端口中
echo "0 0" > /dev/my_miscdev
--如何了解学习驱动：
将对函数和数据结构的理解放在整体的架构背景之中。
--设备树的语法了解
--设备树相关的接口了解
--2020年10月16日10:07:41
这周先对整个框架进行了解，相关的文档资料等
--hidl参考博客：
https://blog.csdn.net/sinat_18179367/article/details/95940030
--创建目录
mkdir -p hardware/interfaces/naruto/1.0/default
--创建文件INaruto.hal 添加如下代码
package android.hardware.naruto@1.0
;
interface INaruto
{
helloWorld
(string name
) generates
(string result
);
};
PACKAGE
=android.hardware.test@1.0
LOC
=hardware/interfaces/test/1.0/default
./hardware/interfaces/update-makefiles.sh
touch hardware/interfaces/naruto/1.0/default/android.hardware.naruto@1.0-service.rc
touch hardware/interfaces/naruto/1.0/default/service.cpp
--修改和添加.h .c文件，实现输出hello功能
--使用以下命令进行编译
--mmm :编译指定目录下的模块，不编译他所依赖的其他模块
--mma :编译当前目录下的模块及其依赖
--mmma:编译指定路径下所有模块，并且包含依赖
--mm: 编译当前目录下的模块，不编译依赖模块
mmm hardware/interfaces/naruto/1.0/
mmm hardware/interfaces/test/1.0/
out/target/product/ac8257_demo/system/lib/vndk-28/android.hardware.naruto@1.0.so
--ubuntu 14 虚拟机账号密码：
root root
ssh -x luoyankuan@172.168.0.90
git status
.
git diff domU/kernel/kernel-4.9/drivers/base/firmware_class.c
git diff domU/kernel/kernel-4.9/drivers/input/touchscreen/autochips/GT928/gt9xx_driver.c
source ./build/envsetup.sh
lunch 15
PACKAGE
=android.hardware.naruto@1.0
LOC
=hardware/interfaces/naruto/1.0/default
make hidl-gen -j64
hidl-gen -o
$LOC -Lc++-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport
$PACKAGE
hidl-gen -o
$LOC -Landroidbp-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport
$PACKAGE
--更新
./hardware/interfaces/update-makefiles.sh
--添加新文件
touch hardware/interfaces/naruto/1.0/default/android.hardware.naruto@1.0-service.rc
touch hardware/interfaces/naruto/1.0/default/service.cpp
--修改Naruto.h和Naruto.cpp文件
--执行编译：
mmm hardware/interfaces/naruto/1.0/default/
--ok
uInstall: out/target/product/ac8257_demo/system/lib/vndk-28/android.hardware.naruto@1.0.so
[100% 31/31
] build
'out/target/product/ac8257_demo/vendor/lib/hw/android.hardware.naruto@1.0-impl.so'
--客户端实现
--system_service 实现
system\sepolicy\prebuilts\api\28.0\public
--vim 代码格式化
1，gg 跳转到第一行
2，shift+v 转到可视模式
3，shift+g 全选
4，按下神奇的
=
--先不用管什么，照着做，做完后再用gitk看修改过的内容，从大局角度上看整个过程，有不懂得就继续详细
--问题：
编写的驱动无法正常编译通过
虚拟机gitk无法使用问题
error: VNDK library list has been changed.
Changing the VNDK library list is not allowed
in API locked branches.
out/target/product/product_name/obj/PACKAGING/vndk_intermediates/libs.txt
vim ~/ac8257/build/make/target/product/vndk/28.txt
vim ~/ac8257/build/make/target/product/vndk/current.txt
vim out/target/product/ac8257_demo/obj/PACKAGING/vndk_intermediates/libs.txt
VNDK-core: android.hardware.test@1.0.so
git命令参数：
git clone
<版本库的网址
>
git fetch
<远程主机名
> <分支名
>
git pull
<远程主机名
> <远程分支名
>:
<本地分支名
>
git push
<远程主机名
> <本地分支名
>:
<远程分支名
>
diff system/sepolicy/prebuilts/api/28.0/private/service_contexts system/sepolicy/private/service_contexts
vim system/sepolicy/prebuilts/api/28.0/private/service_contexts
vim system/sepolicy/private/service_contexts
--查看服务
service list
--查看进程
ps -Af
| grep -i
"naruto"
--看日志
logcat
|grep " SystemServer"
--需要熟悉知道相关的命令，大概知道是什么功能，需要的时候可以想的起来就行
--一定要去实验验证自己的想法是否正确，只有验证过了的才能更加确信什么是正确的。
--当然要看是否值得这么去做，如果成本过高就没必要了。
--android app
C:/Program Files/Android/Android Studio/gradle/gradle-6.1.1
distributionUrl
=file:///C\:/Program Files/Android/Android Studio/gredle/gradle-6.1.1-all.zip
C:\luoyankuan\installer\AndroidStudio\plugins\gradle
distributionUrl
=file:///C\:/luoyankuan/installer/AndroidStudio/plugins/gradle/gradle-6.1.1-all.zip
--在app中调用helloworld接口
--如何在app中调用底层的framework接口？
--在helloWorld接口中添加操作led的操作
adb
install xxx/xxx/xxx.apk
不使用Proxy代理模式，替换相关gradle
若出错可删除C:\Users\yk\.gradle下的gradle.properties
ac8257/out/target/common/obj/JAVA_LIBRARIES/framework_intermediates
ac8257\out\target\common\obj\JAVA_LIBRARIES\framework_intermediates
\\172.168.0.90\luoyankuan\ac8257\out\target\common\obj\JAVA_LIBRARIES\framework_intermediates
--版本兼容问题，在build.gradle添加：
compileOptions
{
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
maven
{url
'http://maven.aliyun.com/nexus/content/groups/public/'}
maven
{url
'http://maven.aliyun.com/nexus/content/repositories/jcenter'}
不需要导入jar包，直接替换相关的文件接口即可
C:\Users\yk\AppData\Local\Android\Sdk\platforms\android-30
\\172.168.0.90\luoyankuan\ac8257\out\target\common\obj\JAVA_LIBRARIES\framework_intermediates
目录下的classes.jar的相应内容替换到android.jar对应目录下
--以上就是整个app系统的调用流程，需进一步总结分析。
剩下就是做两个按钮，控制led的亮灭就行了。可直接在helloworld里面加。
allow 源类型 目标类型:
[tclass
] { 操作权限
};
allow scontext tcontext:
[tclass
] { denied:
};
allow autolog hal_naruto_default:file
{ open read };
allow autolog hal_naruto_default:dir
{ search getattr
};
allow hal_naruto_default device:file
{ open read write
};
system/sepolicy/public/domain.te +417 注释掉
--调试
echo 0 0
> /dev/my_miscdev
dmesg
chmod 777 /dev/my_miscdev
