如何创建一个Hidl Service?

1. 工具

创建工具脚本：hello_word1_0-hidl-gen.sh

#!/bin/bash
PACKAGE=android.hardware.hello_word@1.0
LOC=hardware/interfaces/hello_word/1.0/default/
#SS=android.hardware:hardware/interfaces
#TT=android.hidl:system/libhidl/transport#hidl-gen -o . -Landroidbp -r$SS -r$TT $PACKAGE
#hidl-gen -L hash -r$SS -r$TT $PACKAGE
#hidl-gen -o $LOC -Lc++-impl -r$SS -r$TT $PACKAGE
#hidl-gen -o $LOC -Landroidbp-impl -r$SS -r$TT $PACKAGE
out/soong/host/linux-x86/bin/hidl-gen -o . -Landroidbp -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport $PACKAGE
out/soong/host/linux-x86/bin/hidl-gen -L hash -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport $PACKAGE
out/soong/host/linux-x86/bin/hidl-gen -o $LOC -Lc++-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport $PACKAGE
out/soong/host/linux-x86/bin/hidl-gen -o $LOC -Landroidbp-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport $PACKAGE

2. 创建.hal文件

#mkdir -p hardware/interfaces/hello_word/1.0

#cd hardware/interfaces/hello_word/1.0

#touch IHelloWordHidl.hal

#touch IHelloWordCallback.hal

2.1 修改文件

IHelloWordHidl.hal

package android.hardware.hello_word@1.0;import @1.0::IHelloWordCallback;
import @1.0::types;/*** hello_word HAL, first modern version** Supports the netlink API* API at LIMITED or better hardware level.**/interface IHelloWordHidl {HelloWordSetCallback(IHelloWordCallback callback);HelloWordHidlInit() generates(uint32_t status);HelloWordHidlDeInit() generates(uint32_t status);HelloWordHidlStart() generates(uint32_t status);HelloWordHidlStop() generates(uint32_t status);oneway HelloWordHidlSend(hellword_packet_msg msg);//
};

HelloWordCallback.hal:

package android.hardware.hello_word@1.0;import @1.0::types;/*** hello_word HAL, first modern version** Supports the netlink API* API at LIMITED or better hardware level.**/interface IHelloWordCallback {oneway notify(helloword_packet_msg msg);//for msg notify.};

types.hal

package android.hardware.hello_word@1.0;struct helloword_packet_msg
{uint32_t length;string msg;//msg;//memory data;
};

2.2 运行脚本

#./hello_word1_0-hidl-gen.sh

2.3 修改default/*.c文件

2.4 修改default/Android.bp文件

// FIXME: your file license if you have one
cc_binary {name: "android.hardware.hello_word@1.0-service",init_rc: ["android.hardware.hello_word@1.0-service.rc"],vintf_fragments: ["android.hardware.hello_word@1.0-service.xml"],relative_install_path: "hw",vendor: true,srcs: ["HelloWordHidl.cpp","service.cpp",],shared_libs: ["liblog","libdl","libutils","libcutils","libhardware","libhidlbase","libhidlmemory","libhidltransport","android.hidl.allocator@1.0","android.hidl.memory@1.0","android.hardware.hello_word@1.0",],
}

2.5 增加服务相关文件

service.cpp

android.hardware.hello_word@1.0-service.rc

android.hardware.hello_word@1.0-service.xml

service.cpp:

#define LOG_TAG "android.hardware.hello_word@1.0-service"#include <android/hardware/hello_word/1.0/IHelloWordHidl.h>
#include <hidl/LegacySupport.h>
#include <hidl/HidlTransportSupport.h>
#include "HelloWordHidl.h"using android::hardware::hello_word::V1_0::IHelloWordHidl;
using android::hardware::hello_word::V1_0::implementation::IHelloWordHidl;
//using android::hardware::defaultPassthroughServiceImplementation;
using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;
using android::sp;
using android::status_t;
using android::OK;int main() {configureRpcThreadpool(3, true);//max thread number for request.sp<IHelloWordHidl> hello_word = new HelloWordHidl;status_t status = kevent_comm->registerAsService();ALOGW_IF(status != OK, "Could not register HelloWordHidl v1.0");ALOGD("Default service is ready.");joinRpcThreadpool();return 1;}

android.hardware.hello_word@1.0-service.rc：

service hello_word_1_0 /vendor/bin/hw/android.hardware.hello_word@1.0-serviceclass haluser systemgroup system

android.hardware.kevent_comm@1.0-service：

<manifest version="1.0" type="device"><hal format="hidl"><name>android.hardware.hello_word</name><transport>hwbinder</transport><version>1.0</version><interface><name>IHelloWordHidl</name><instance>default</instance></interface></hal>
</manifest>

3. 配置

3.1 device/<board>/目录下

manifest.xml：//增加如下

<hal format="hidl"><name>android.hardware.hello_word</name><transport>hwbinder</transport><version>1.0</version><interface><name>IHelloWordHidl</name><instance>default</instance></interface>
</hal>

<board>.mk 文件增加：

PRODUCT_PACKAGES += android.hardware.hello_word@1.0 \android.hardware.hello_word@1.0-service

3.2 build/make/target/product 目录下vndk api接口

修改current.txt //增加内容

VNDK-core: android.hardware.hello_word@1.0.so

修改<api_level>.txt //增加内容

VNDK-core: android.hardware.hello_word@1.0.so

编译报错：

ory
checkvintf E 01-31 15:33:30 3609151 3609151 check_vintf.cpp:554] files are incompatible: The following instances are in the device manifest but not specified in framework compatibility matrix:
checkvintf E 01-31 15:33:30 3609151 3609151 check_vintf.cpp:554] android.hardware.hello_word@1.0::IHelloWordHidl/default
checkvintf E 01-31 15:33:30 3609151 3609151 check_vintf.cpp:554] Suggested fix:
checkvintf E 01-31 15:33:30 3609151 3609151 check_vintf.cpp:554] 1. Update deprecated HALs to the latest version.
checkvintf E 01-31 15:33:30 3609151 3609151 check_vintf.cpp:554] 2. Check for any typos in device manifest or framework compatibility matrices with FCM version >= 5.
checkvintf E 01-31 15:33:30 3609151 3609151 check_vintf.cpp:554] 3. For new platform HALs, add them to any framework compatibility matrix with FCM version >= 5 where applicable.
checkvintf E 01-31 15:33:30 3609151 3609151 check_vintf.cpp:554] 4. For device-specific HALs, add to DEVICE_FRAMEWORK_COMPATIBILITY_MATRIX_FILE or DEVICE_PRODUCT_COMPATIBILITY_MATRIX_FILE.: Success
INCOMPATIBLE

修改：

hardware/interfaces/compatibility_matrices/compatibility_matrix.5.xml

增加如下内容：

<hal format="hidl" optional="true"><name>android.hardware.hello_word</name><version>1.0</version><interface><name>IHelloWordHidl</name><instance>default</instance></interface>
</hal>

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