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（八十一）探索hidl-gen使用及IWifi.hal 实现

作者：小小林熬夜学编程 | 2024-03-17 12:07:16

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hidl-gen

1.文件路径

/hardware/interfaces/wifi/1.0/IWifi.hal

  1. /*
  2.  * Copyright 2016 The Android Open Source Project
  3.  *
  4.  * Licensed under the Apache License, Version 2.0 (the "License");
  5.  * you may not use this file except in compliance with the License.
  6.  * You may obtain a copy of the License at
  7.  *
  8.  *      http://www.apache.org/licenses/LICENSE-2.0
  9.  *
  10.  * Unless required by applicable law or agreed to in writing, software
  11.  * distributed under the License is distributed on an "AS IS" BASIS,
  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13.  * See the License for the specific language governing permissions and
  14.  * limitations under the License.
  15.  */
  16.  
  17. package android.hardware.wifi@1.0;
  18.  
  19. import IWifiChip;
  20. import IWifiEventCallback;
  21.  
  22. /**
  23.  * This is the root of the HAL module and is the interface returned when
  24.  * loading an implementation of the Wi-Fi HAL. There must be at most one
  25.  * module loaded in the system.
  26.  */
  27. interface IWifi {
  28.   /**
  29.    * Requests notifications of significant events for the HAL. Multiple calls to
  30.    * this must register multiple callbacks each of which must receive all
  31.    * events. |IWifiEventCallback| object registration must be independent of the
  32.    * state of the rest of the HAL and must persist though stops/starts. These
  33.    * objects must be deleted when the corresponding client process is dead.
  34.    *
  35.    * @param callback An instance of the |IWifiEventCallback| HIDL interface
  36.    *        object.
  37.    * @return status WifiStatus of the operation.
  38.    *         Possible status codes:
  39.    *         |WifiStatusCode.SUCCESS|,
  40.    *         |WifiStatusCode.UNKNOWN|
  41.    */
  42.   @entry
  43.   @callflow(next={"*"})
  44.   registerEventCallback(IWifiEventCallback callback)
  45.       generates (WifiStatus status);
  46.  
  47.   /**
  48.    * Get the current state of the HAL.
  49.    *
  50.    * @return started true if started, false otherwise.
  51.    */
  52.   isStarted() generates (bool started);
  53.  
  54.   /**
  55.    * Perform any setup that is required to make use of the module. If the module
  56.    * is already started then this must be a noop.
  57.    * Must trigger |IWifiEventCallback.onStart| on success.
  58.    *
  59.    * @return status WifiStatus of the operation.
  60.    *         Possible status codes:
  61.    *         |WifiStatusCode.SUCCESS|,
  62.    *         |WifiStatusCode.NOT_AVAILABLE|,
  63.    *         |WifiStatusCode.UNKNOWN|
  64.    */
  65.   @entry
  66.   @callflow(next={"registerEventCallback", "start", "stop", "getChip"})
  67.   start() generates (WifiStatus status);
  68.  
  69.   /**
  70.    * Tear down any state, ongoing commands, etc. If the module is already
  71.    * stopped then this must be a noop. If the HAL is already stopped or it
  72.    * succeeds then onStop must be called. After calling this all IWifiChip
  73.    * objects will be considered invalid.
  74.    * Must trigger |IWifiEventCallback.onStop| on success.
  75.    * Must trigger |IWifiEventCallback.onFailure| on failure.
  76.    *
  77.    * Calling stop then start is a valid way of resetting state in the HAL,
  78.    * driver, firmware.
  79.    *
  80.    * @return status WifiStatus of the operation.
  81.    *         Possible status codes:
  82.    *         |WifiStatusCode.SUCCESS|,
  83.    *         |WifiStatusCode.NOT_STARTED|,
  84.    *         |WifiStatusCode.UNKNOWN|
  85.    */
  86.   @exit
  87.   @callflow(next={"registerEventCallback", "start", "stop"})
  88.   stop() generates (WifiStatus status);
  89.  
  90.   /**
  91.    * Retrieve the list of all chip Id's on the device.
  92.    * The corresponding |IWifiChip| object for any chip can be
  93.    * retrieved using |getChip| method.
  94.    *
  95.    * @return status WifiStatus of the operation.
  96.    *         Possible status codes:
  97.    *         |WifiStatusCode.SUCCESS|,
  98.    *         |WifiStatusCode.NOT_STARTED|,
  99.    *         |WifiStatusCode.UNKNOWN|
  100.    * @return chipIds List of all chip Id's on the device.
  101.    */
  102.   @callflow(next={"*"})
  103.   getChipIds() generates (WifiStatus status, vec<ChipId> chipIds);
  104.  
  105.   /**
  106.    * Gets a HIDL interface object for the chip corresponding to the
  107.    * provided chipId.
  108.    *
  109.    * @return status WifiStatus of the operation.
  110.    *         Possible status codes:
  111.    *         |WifiStatusCode.SUCCESS|,
  112.    *         |WifiStatusCode.NOT_STARTED|,
  113.    *         |WifiStatusCode.UNKNOWN|
  114.    * @return chip HIDL interface object representing the chip.
  115.    */
  116.   @callflow(next={"*"})
  117.   getChip(ChipId chipId) generates (WifiStatus status, IWifiChip chip);
  118. };

看起来也挺简单的，就是定义了一些未实现的接口，和接口定义差不多。

 

2.对应Android.bp文件

  1. // This file is autogenerated by hidl-gen. Do not edit manually.
  2.  
  3. filegroup {
  4.     name: "android.hardware.wifi@1.0_hal",
  5.     srcs: [
  6.         "types.hal",
  7.         "IWifi.hal",
  8.         "IWifiApIface.hal",
  9.         "IWifiChip.hal",
  10.         "IWifiChipEventCallback.hal",
  11.         "IWifiEventCallback.hal",
  12.         "IWifiIface.hal",
  13.         "IWifiNanIface.hal",
  14.         "IWifiNanIfaceEventCallback.hal",
  15.         "IWifiP2pIface.hal",
  16.         "IWifiRttController.hal",
  17.         "IWifiRttControllerEventCallback.hal",
  18.         "IWifiStaIface.hal",
  19.         "IWifiStaIfaceEventCallback.hal",
  20.     ],
  21. }
  22.  
  23. genrule {
  24.     name: "android.hardware.wifi@1.0_genc++",
  25.     tools: ["hidl-gen"],
  26.     cmd: "$(location hidl-gen) -o $(genDir) -Lc++-sources -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.wifi@1.0",
  27.     srcs: [
  28.         ":android.hardware.wifi@1.0_hal",
  29.     ],
  30.     out: [
  31.         "android/hardware/wifi/1.0/types.cpp",
  32.         "android/hardware/wifi/1.0/WifiAll.cpp",
  33.         "android/hardware/wifi/1.0/WifiApIfaceAll.cpp",
  34.         "android/hardware/wifi/1.0/WifiChipAll.cpp",
  35.         "android/hardware/wifi/1.0/WifiChipEventCallbackAll.cpp",
  36.         "android/hardware/wifi/1.0/WifiEventCallbackAll.cpp",
  37.         "android/hardware/wifi/1.0/WifiIfaceAll.cpp",
  38.         "android/hardware/wifi/1.0/WifiNanIfaceAll.cpp",
  39.         "android/hardware/wifi/1.0/WifiNanIfaceEventCallbackAll.cpp",
  40.         "android/hardware/wifi/1.0/WifiP2pIfaceAll.cpp",
  41.         "android/hardware/wifi/1.0/WifiRttControllerAll.cpp",
  42.         "android/hardware/wifi/1.0/WifiRttControllerEventCallbackAll.cpp",
  43.         "android/hardware/wifi/1.0/WifiStaIfaceAll.cpp",
  44.         "android/hardware/wifi/1.0/WifiStaIfaceEventCallbackAll.cpp",
  45.     ],
  46. }
  47.  
  48. genrule {
  49.     name: "android.hardware.wifi@1.0_genc++_headers",
  50.     tools: ["hidl-gen"],
  51.     cmd: "$(location hidl-gen) -o $(genDir) -Lc++-headers -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.wifi@1.0",
  52.     srcs: [
  53.         ":android.hardware.wifi@1.0_hal",
  54.     ],
  55.     out: [
  56.         "android/hardware/wifi/1.0/types.h",
  57.         "android/hardware/wifi/1.0/hwtypes.h",
  58.         "android/hardware/wifi/1.0/IWifi.h",
  59.         "android/hardware/wifi/1.0/IHwWifi.h",
  60.         "android/hardware/wifi/1.0/BnHwWifi.h",
  61.         "android/hardware/wifi/1.0/BpHwWifi.h",
  62.         "android/hardware/wifi/1.0/BsWifi.h",
  63.         "android/hardware/wifi/1.0/IWifiApIface.h",
  64.         "android/hardware/wifi/1.0/IHwWifiApIface.h",
  65.         "android/hardware/wifi/1.0/BnHwWifiApIface.h",
  66.         "android/hardware/wifi/1.0/BpHwWifiApIface.h",
  67.         "android/hardware/wifi/1.0/BsWifiApIface.h",
  68.         "android/hardware/wifi/1.0/IWifiChip.h",
  69.         "android/hardware/wifi/1.0/IHwWifiChip.h",
  70.         "android/hardware/wifi/1.0/BnHwWifiChip.h",
  71.         "android/hardware/wifi/1.0/BpHwWifiChip.h",
  72.         "android/hardware/wifi/1.0/BsWifiChip.h",
  73.         "android/hardware/wifi/1.0/IWifiChipEventCallback.h",
  74.         "android/hardware/wifi/1.0/IHwWifiChipEventCallback.h",
  75.         "android/hardware/wifi/1.0/BnHwWifiChipEventCallback.h",
  76.         "android/hardware/wifi/1.0/BpHwWifiChipEventCallback.h",
  77.         "android/hardware/wifi/1.0/BsWifiChipEventCallback.h",
  78.         "android/hardware/wifi/1.0/IWifiEventCallback.h",
  79.         "android/hardware/wifi/1.0/IHwWifiEventCallback.h",
  80.         "android/hardware/wifi/1.0/BnHwWifiEventCallback.h",
  81.         "android/hardware/wifi/1.0/BpHwWifiEventCallback.h",
  82.         "android/hardware/wifi/1.0/BsWifiEventCallback.h",
  83.         "android/hardware/wifi/1.0/IWifiIface.h",
  84.         "android/hardware/wifi/1.0/IHwWifiIface.h",
  85.         "android/hardware/wifi/1.0/BnHwWifiIface.h",
  86.         "android/hardware/wifi/1.0/BpHwWifiIface.h",
  87.         "android/hardware/wifi/1.0/BsWifiIface.h",
  88.         "android/hardware/wifi/1.0/IWifiNanIface.h",
  89.         "android/hardware/wifi/1.0/IHwWifiNanIface.h",
  90.         "android/hardware/wifi/1.0/BnHwWifiNanIface.h",
  91.         "android/hardware/wifi/1.0/BpHwWifiNanIface.h",
  92.         "android/hardware/wifi/1.0/BsWifiNanIface.h",
  93.         "android/hardware/wifi/1.0/IWifiNanIfaceEventCallback.h",
  94.         "android/hardware/wifi/1.0/IHwWifiNanIfaceEventCallback.h",
  95.         "android/hardware/wifi/1.0/BnHwWifiNanIfaceEventCallback.h",
  96.         "android/hardware/wifi/1.0/BpHwWifiNanIfaceEventCallback.h",
  97.         "android/hardware/wifi/1.0/BsWifiNanIfaceEventCallback.h",
  98.         "android/hardware/wifi/1.0/IWifiP2pIface.h",
  99.         "android/hardware/wifi/1.0/IHwWifiP2pIface.h",
  100.         "android/hardware/wifi/1.0/BnHwWifiP2pIface.h",
  101.         "android/hardware/wifi/1.0/BpHwWifiP2pIface.h",
  102.         "android/hardware/wifi/1.0/BsWifiP2pIface.h",
  103.         "android/hardware/wifi/1.0/IWifiRttController.h",
  104.         "android/hardware/wifi/1.0/IHwWifiRttController.h",
  105.         "android/hardware/wifi/1.0/BnHwWifiRttController.h",
  106.         "android/hardware/wifi/1.0/BpHwWifiRttController.h",
  107.         "android/hardware/wifi/1.0/BsWifiRttController.h",
  108.         "android/hardware/wifi/1.0/IWifiRttControllerEventCallback.h",
  109.         "android/hardware/wifi/1.0/IHwWifiRttControllerEventCallback.h",
  110.         "android/hardware/wifi/1.0/BnHwWifiRttControllerEventCallback.h",
  111.         "android/hardware/wifi/1.0/BpHwWifiRttControllerEventCallback.h",
  112.         "android/hardware/wifi/1.0/BsWifiRttControllerEventCallback.h",
  113.         "android/hardware/wifi/1.0/IWifiStaIface.h",
  114.         "android/hardware/wifi/1.0/IHwWifiStaIface.h",
  115.         "android/hardware/wifi/1.0/BnHwWifiStaIface.h",
  116.         "android/hardware/wifi/1.0/BpHwWifiStaIface.h",
  117.         "android/hardware/wifi/1.0/BsWifiStaIface.h",
  118.         "android/hardware/wifi/1.0/IWifiStaIfaceEventCallback.h",
  119.         "android/hardware/wifi/1.0/IHwWifiStaIfaceEventCallback.h",
  120.         "android/hardware/wifi/1.0/BnHwWifiStaIfaceEventCallback.h",
  121.         "android/hardware/wifi/1.0/BpHwWifiStaIfaceEventCallback.h",
  122.         "android/hardware/wifi/1.0/BsWifiStaIfaceEventCallback.h",
  123.     ],
  124. }
  125.  
  126. cc_library {
  127.     name: "android.hardware.wifi@1.0",
  128.     defaults: ["hidl-module-defaults"],
  129.     generated_sources: ["android.hardware.wifi@1.0_genc++"],
  130.     generated_headers: ["android.hardware.wifi@1.0_genc++_headers"],
  131.     export_generated_headers: ["android.hardware.wifi@1.0_genc++_headers"],
  132.     vendor_available: true,
  133.     vndk: {
  134.         enabled: true,
  135.     },
  136.     shared_libs: [
  137.         "libhidlbase",
  138.         "libhidltransport",
  139.         "libhwbinder",
  140.         "liblog",
  141.         "libutils",
  142.         "libcutils",
  143.     ],
  144.     export_shared_lib_headers: [
  145.         "libhidlbase",
  146.         "libhidltransport",
  147.         "libhwbinder",
  148.         "libutils",
  149.     ],
  150. }

简单地看下这个Android.bp文件：

filegroup-"android.hardware.wifi@1.0_hal"：包含了该目录下所有的hal文件

genrule-"android.hardware.wifi@1.0_genc++"：使用上面的filegroup作为src编译出对应的cpp文件

genrule-"android.hardware.wifi@1.0_genc++_headers"：使用上面的filegroup作为src编译出对应的.h文件

之后下面的抬头“android.hardware.wifi@1.0”经常看到，调用到wifi hal的都会声明到这个。

  1. cc_library {
  2.     name: "android.hardware.wifi@1.0",
  3.     defaults: ["hidl-module-defaults"],
  4.     generated_sources: ["android.hardware.wifi@1.0_genc++"],
  5.     generated_headers: ["android.hardware.wifi@1.0_genc++_headers"],
  6.     export_generated_headers: ["android.hardware.wifi@1.0_genc++_headers"],
  7.     vendor_available: true,
  8.     vndk: {
  9.         enabled: true,
  10.     },
  11.     shared_libs: [
  12.         "libhidlbase",
  13.         "libhidltransport",
  14.         "libhwbinder",
  15.         "liblog",
  16.         "libutils",
  17.         "libcutils",
  18.     ],
  19.     export_shared_lib_headers: [
  20.         "libhidlbase",
  21.         "libhidltransport",
  22.         "libhwbinder",
  23.         "libutils",
  24.     ],
  25. }

 

2.1 hidl-gen

注意到Android.bp文件中有如下命令是可以生成对应资源的，试一试。

cmd: "$(location hidl-gen) -o $(genDir) -Lc++-headers -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.wifi@1.0"

先期准备

  1. 1)source build/envsetup.sh
  2.  
  3. 2)lunch
  4.  
  5. 3)make hidl-gen -j4
  6.  
  7. //[100% 460/460] Install: out/host/linux-x86/bin/hidl-gen

 

2.1.1 生成c++-sources

cmd: "$(location hidl-gen) -o $(genDir) -Lc++-sources -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.wifi@1.0"

 

2.1.2 生成c++-headers

cmd: "$(location hidl-gen) -o $(genDir) -Lc++-headers -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.wifi@1.0"

 

2.1.3 生成Android.bp

cmd: "$(location hidl-gen) -o $(genDir) -Landroidbp -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.wifi@1.0"

生成的Android.bp文件是和之前一摸一样的。

2.1.4 生成Android.mk

 

2.1.5 生成androidbp-impl

 hidl-gen -o ./test_hidl_wifi/ -Landroidbp-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.wifi@1.0

  1. cc_library_shared {
  2.     name: "android.hardware.wifi@1.0-impl",
  3.     relative_install_path: "hw",
  4.     proprietary: true,
  5.     srcs: [
  6.         "Wifi.cpp",
  7.         "WifiApIface.cpp",
  8.         "WifiChip.cpp",
  9.         "WifiChipEventCallback.cpp",
  10.         "WifiEventCallback.cpp",
  11.         "WifiIface.cpp",
  12.         "WifiNanIface.cpp",
  13.         "WifiNanIfaceEventCallback.cpp",
  14.         "WifiP2pIface.cpp",
  15.         "WifiRttController.cpp",
  16.         "WifiRttControllerEventCallback.cpp",
  17.         "WifiStaIface.cpp",
  18.         "WifiStaIfaceEventCallback.cpp",
  19.     ],
  20.     shared_libs: [
  21.         "libhidlbase",
  22.         "libhidltransport",
  23.         "libutils",
  24.         "android.hardware.wifi@1.0",
  25.     ],
  26. }

 

2.1.6 生成c++-impl

生成HIDL的默认实现。

看下Wifi.h和Wifi.cpp

  1. #ifndef ANDROID_HARDWARE_WIFI_V1_0_WIFI_H
  2. #define ANDROID_HARDWARE_WIFI_V1_0_WIFI_H
  3.  
  4. #include <android/hardware/wifi/1.0/IWifi.h>
  5. #include <hidl/MQDescriptor.h>
  6. #include <hidl/Status.h>
  7.  
  8. namespace android {
  9. namespace hardware {
  10. namespace wifi {
  11. namespace V1_0 {
  12. namespace implementation {
  13.  
  14. using ::android::hardware::hidl_array;
  15. using ::android::hardware::hidl_memory;
  16. using ::android::hardware::hidl_string;
  17. using ::android::hardware::hidl_vec;
  18. using ::android::hardware::Return;
  19. using ::android::hardware::Void;
  20. using ::android::sp;
  21.  
  22. struct Wifi : public IWifi {
  23.     // Methods from IWifi follow.
  24.     Return<void> registerEventCallback(const sp<IWifiEventCallback>& callback, registerEventCallback_cb _hidl_cb) override;
  25.     Return<bool> isStarted() override;
  26.     Return<void> start(start_cb _hidl_cb) override;
  27.     Return<void> stop(stop_cb _hidl_cb) override;
  28.     Return<void> getChipIds(getChipIds_cb _hidl_cb) override;
  29.     Return<void> getChip(uint32_t chipId, getChip_cb _hidl_cb) override;
  30.  
  31.     // Methods from ::android::hidl::base::V1_0::IBase follow.
  32.  
  33. };
  34.  
  35. // FIXME: most likely delete, this is only for passthrough implementations
  36. // extern "C" IWifi* HIDL_FETCH_IWifi(const char* name);
  37.  
  38. }  // namespace implementation
  39. }  // namespace V1_0
  40. }  // namespace wifi
  41. }  // namespace hardware
  42. }  // namespace android
  43.  
  44. #endif  // ANDROID_HARDWARE_WIFI_V1_0_WIFI_H

 

  1. #include "Wifi.h"
  2.  
  3. namespace android {
  4. namespace hardware {
  5. namespace wifi {
  6. namespace V1_0 {
  7. namespace implementation {
  8.  
  9. // Methods from IWifi follow.
  10. Return<void> Wifi::registerEventCallback(const sp<IWifiEventCallback>& callback, registerEventCallback_cb _hidl_cb) {
  11.     // TODO implement
  12.     return Void();
  13. }
  14.  
  15. Return<bool> Wifi::isStarted() {
  16.     // TODO implement
  17.     return bool {};
  18. }
  19.  
  20. Return<void> Wifi::start(start_cb _hidl_cb) {
  21.     // TODO implement
  22.     return Void();
  23. }
  24.  
  25. Return<void> Wifi::stop(stop_cb _hidl_cb) {
  26.     // TODO implement
  27.     return Void();
  28. }
  29.  
  30. Return<void> Wifi::getChipIds(getChipIds_cb _hidl_cb) {
  31.     // TODO implement
  32.     return Void();
  33. }
  34.  
  35. Return<void> Wifi::getChip(uint32_t chipId, getChip_cb _hidl_cb) {
  36.     // TODO implement
  37.     return Void();
  38. }
  39.  
  40.  
  41. // Methods from ::android::hidl::base::V1_0::IBase follow.
  42.  
  43. //IWifi* HIDL_FETCH_IWifi(const char* /* name */) {
  44. //    return new Wifi();
  45. //}
  46.  
  47. }  // namespace implementation
  48. }  // namespace V1_0
  49. }  // namespace wifi
  50. }  // namespace hardware
  51. }  // namespace android

都是空实现，结合hidl是framework和vendor的桥梁，所以实现应该是由vendor实现的?1.1的wifi hal版本中有默认的实现。

  1. /*
  2.  * Copyright (C) 2016 The Android Open Source Project
  3.  *
  4.  * Licensed under the Apache License, Version 2.0 (the "License");
  5.  * you may not use this file except in compliance with the License.
  6.  * You may obtain a copy of the License at
  7.  *
  8.  *      http://www.apache.org/licenses/LICENSE-2.0
  9.  *
  10.  * Unless required by applicable law or agreed to in writing, software
  11.  * distributed under the License is distributed on an "AS IS" BASIS,
  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13.  * See the License for the specific language governing permissions and
  14.  * limitations under the License.
  15.  */
  16.  
  17. #include <android-base/logging.h>
  18.  
  19. #include "hidl_return_util.h"
  20. #include "wifi.h"
  21. #include "wifi_status_util.h"
  22.  
  23. namespace {
  24. // Chip ID to use for the only supported chip.
  25. static constexpr android::hardware::wifi::V1_0::ChipId kChipId = 0;
  26. }  // namespace
  27.  
  28. namespace android {
  29. namespace hardware {
  30. namespace wifi {
  31. namespace V1_1 {
  32. namespace implementation {
  33. using hidl_return_util::validateAndCall;
  34. using hidl_return_util::validateAndCallWithLock;
  35.  
  36. Wifi::Wifi()
  37.     : legacy_hal_(new legacy_hal::WifiLegacyHal()),
  38.       mode_controller_(new mode_controller::WifiModeController()),
  39.       run_state_(RunState::STOPPED) {}
  40.  
  41. bool Wifi::isValid() {
  42.   // This object is always valid.
  43.   return true;
  44. }
  45.  
  46. Return<void> Wifi::registerEventCallback(
  47.     const sp<IWifiEventCallback>& event_callback,
  48.     registerEventCallback_cb hidl_status_cb) {
  49.   return validateAndCall(this,
  50.                          WifiStatusCode::ERROR_UNKNOWN,
  51.                          &Wifi::registerEventCallbackInternal,
  52.                          hidl_status_cb,
  53.                          event_callback);
  54. }
  55.  
  56. Return<bool> Wifi::isStarted() {
  57.   return run_state_ != RunState::STOPPED;
  58. }
  59.  
  60. Return<void> Wifi::start(start_cb hidl_status_cb) {
  61.   return validateAndCall(this,
  62.                          WifiStatusCode::ERROR_UNKNOWN,
  63.                          &Wifi::startInternal,
  64.                          hidl_status_cb);
  65. }
  66.  
  67. Return<void> Wifi::stop(stop_cb hidl_status_cb) {
  68.   return validateAndCallWithLock(this, WifiStatusCode::ERROR_UNKNOWN,
  69.                                  &Wifi::stopInternal, hidl_status_cb);
  70. }
  71.  
  72. Return<void> Wifi::getChipIds(getChipIds_cb hidl_status_cb) {
  73.   return validateAndCall(this,
  74.                          WifiStatusCode::ERROR_UNKNOWN,
  75.                          &Wifi::getChipIdsInternal,
  76.                          hidl_status_cb);
  77. }
  78.  
  79. Return<void> Wifi::getChip(ChipId chip_id, getChip_cb hidl_status_cb) {
  80.   return validateAndCall(this,
  81.                          WifiStatusCode::ERROR_UNKNOWN,
  82.                          &Wifi::getChipInternal,
  83.                          hidl_status_cb,
  84.                          chip_id);
  85. }
  86.  
  87. WifiStatus Wifi::registerEventCallbackInternal(
  88.     const sp<IWifiEventCallback>& event_callback) {
  89.   if (!event_cb_handler_.addCallback(event_callback)) {
  90.     return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
  91.   }
  92.   return createWifiStatus(WifiStatusCode::SUCCESS);
  93. }
  94.  
  95. WifiStatus Wifi::startInternal() {
  96.   if (run_state_ == RunState::STARTED) {
  97.     return createWifiStatus(WifiStatusCode::SUCCESS);
  98.   } else if (run_state_ == RunState::STOPPING) {
  99.     return createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE,
  100.                             "HAL is stopping");
  101.   }
  102.   WifiStatus wifi_status = initializeLegacyHal();
  103.   if (wifi_status.code == WifiStatusCode::SUCCESS) {
  104.     // Create the chip instance once the HAL is started.
  105.     chip_ = new WifiChip(kChipId, legacy_hal_, mode_controller_);
  106.     run_state_ = RunState::STARTED;
  107.     for (const auto& callback : event_cb_handler_.getCallbacks()) {
  108.       if (!callback->onStart().isOk()) {
  109.         LOG(ERROR) << "Failed to invoke onStart callback";
  110.       };
  111.     }
  112.     LOG(INFO) << "Wifi HAL started";
  113.   } else {
  114.     for (const auto& callback : event_cb_handler_.getCallbacks()) {
  115.       if (!callback->onFailure(wifi_status).isOk()) {
  116.         LOG(ERROR) << "Failed to invoke onFailure callback";
  117.       }
  118.     }
  119.     LOG(ERROR) << "Wifi HAL start failed";
  120.   }
  121.   return wifi_status;
  122. }
  123.  
  124. WifiStatus Wifi::stopInternal(
  125.     /* NONNULL */ std::unique_lock<std::recursive_mutex>* lock) {
  126.   if (run_state_ == RunState::STOPPED) {
  127.     return createWifiStatus(WifiStatusCode::SUCCESS);
  128.   } else if (run_state_ == RunState::STOPPING) {
  129.     return createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE,
  130.                             "HAL is stopping");
  131.   }
  132.   // Clear the chip object and its child objects since the HAL is now
  133.   // stopped.
  134.   if (chip_.get()) {
  135.     chip_->invalidate();
  136.     chip_.clear();
  137.   }
  138.   WifiStatus wifi_status = stopLegacyHalAndDeinitializeModeController(lock);
  139.   if (wifi_status.code == WifiStatusCode::SUCCESS) {
  140.     for (const auto& callback : event_cb_handler_.getCallbacks()) {
  141.       if (!callback->onStop().isOk()) {
  142.         LOG(ERROR) << "Failed to invoke onStop callback";
  143.       };
  144.     }
  145.     LOG(INFO) << "Wifi HAL stopped";
  146.   } else {
  147.     for (const auto& callback : event_cb_handler_.getCallbacks()) {
  148.       if (!callback->onFailure(wifi_status).isOk()) {
  149.         LOG(ERROR) << "Failed to invoke onFailure callback";
  150.       }
  151.     }
  152.     LOG(ERROR) << "Wifi HAL stop failed";
  153.   }
  154.   return wifi_status;
  155. }
  156.  
  157. std::pair<WifiStatus, std::vector<ChipId>> Wifi::getChipIdsInternal() {
  158.   std::vector<ChipId> chip_ids;
  159.   if (chip_.get()) {
  160.     chip_ids.emplace_back(kChipId);
  161.   }
  162.   return {createWifiStatus(WifiStatusCode::SUCCESS), std::move(chip_ids)};
  163. }
  164.  
  165. std::pair<WifiStatus, sp<IWifiChip>> Wifi::getChipInternal(ChipId chip_id) {
  166.   if (!chip_.get()) {
  167.     return {createWifiStatus(WifiStatusCode::ERROR_NOT_STARTED), nullptr};
  168.   }
  169.   if (chip_id != kChipId) {
  170.     return {createWifiStatus(WifiStatusCode::ERROR_INVALID_ARGS), nullptr};
  171.   }
  172.   return {createWifiStatus(WifiStatusCode::SUCCESS), chip_};
  173. }
  174.  
  175. WifiStatus Wifi::initializeLegacyHal() {
  176.   legacy_hal::wifi_error legacy_status = legacy_hal_->initialize();
  177.   if (legacy_status != legacy_hal::WIFI_SUCCESS) {
  178.     LOG(ERROR) << "Failed to initialize legacy HAL: "
  179.                << legacyErrorToString(legacy_status);
  180.     return createWifiStatusFromLegacyError(legacy_status);
  181.   }
  182.   return createWifiStatus(WifiStatusCode::SUCCESS);
  183. }
  184.  
  185. WifiStatus Wifi::stopLegacyHalAndDeinitializeModeController(
  186.     /* NONNULL */ std::unique_lock<std::recursive_mutex>* lock) {
  187.   run_state_ = RunState::STOPPING;
  188.   legacy_hal::wifi_error legacy_status =
  189.       legacy_hal_->stop(lock, [&]() { run_state_ = RunState::STOPPED; });
  190.   if (legacy_status != legacy_hal::WIFI_SUCCESS) {
  191.     LOG(ERROR) << "Failed to stop legacy HAL: "
  192.                << legacyErrorToString(legacy_status);
  193.     return createWifiStatusFromLegacyError(legacy_status);
  194.   }
  195.   if (!mode_controller_->deinitialize()) {
  196.     LOG(ERROR) << "Failed to deinitialize firmware mode controller";
  197.     return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
  198.   }
  199.   return createWifiStatus(WifiStatusCode::SUCCESS);
  200. }
  201. }  // namespace implementation
  202. }  // namespace V1_1
  203. }  // namespace wifi
  204. }  // namespace hardware
  205. }  // namespace android

2.1.7 生成hash

/aosp/android_aosp/hardware/interfaces$ vim current.txt

默认与WiFi相关的hash如下所示：

  1. b9be36719a8ad534000a51ea07be91be94c405bf1e038ae825acf65087ffd378 android.hardware.wifi@1.0::IWifi
  2. ee0224ee18813506d9d6f13d8c8e4679f053c290a443a52a7c52a5d3c852262b android.hardware.wifi@1.0::IWifiApIface
  3. f3eecc489deb4c74892f59eb7adb769063bd5c354ac132b626a5f42b363d36bc android.hardware.wifi@1.0::IWifiChip
  4. a1b988377645a58e5e2542ca2bad4e17c21a4a389213d05de2f0e32d57b7d339 android.hardware.wifi@1.0::IWifiChipEventCallback
  5. 5ed6760ce77e84bc6c49d1acb3f7d8117c9176b3f06514bc44ad3af84c80dcfe android.hardware.wifi@1.0::IWifiEventCallback
  6. 6b9ad43a5efbe6ca214f751e22ce43cf5cd4d5d5f2cba80f24ccd3755a72401c android.hardware.wifi@1.0::IWifiIface
  7. ba5aa74f1ba714f0093864227923492808795bda6199c4ea0891322d27f8c931 android.hardware.wifi@1.0::IWifiNanIface
  8. 325c94f3e1a565b56bbc74faddbd0ba7cb824f263dccf9dfff2daf62b86ed774 android.hardware.wifi@1.0::IWifiNanIfaceEventCallback
  9. c2c3f0372b41780fb6dfe83c022296806c2024d7046682fd201de5aa9b791c7a android.hardware.wifi@1.0::IWifiP2pIface
  10. 766e9765f5c9c759b2a763c2288353fb5deff3389c2cc28f81d79c939704ce8b android.hardware.wifi@1.0::IWifiRttController
  11. 72ab6f3e120cbf07aa6f8e87ca89112bdeb36b7fbb96bce5af3712323ab8b8e6 android.hardware.wifi@1.0::IWifiRttControllerEventCallback
  12. 3b8093d39ef1e10e43c5538afbf5ff6e39b8d8168ebbe1998d993e89e25f14a5 android.hardware.wifi@1.0::IWifiStaIface
  13. 7fbfc551c3e23c8b4398c3e16e452b516457e6921424a53474cbf373ca306fa9 android.hardware.wifi@1.0::IWifiStaIfaceEventCallback
  14. e20d5132d6d23e072c15de065b5e2aa13ff965031246a2c82581732bae56bf6d android.hardware.wifi@1.0::types
  15. f7e55c08187d8c855068a1ee3d0c8daeee7570292d96509c21a8756d4f5cfb9b android.hardware.wifi.supplicant@1.0::ISupplicant
  16. 56b5c7267cb3d3337f44eb8b0b38ff4c6260dcc70e07687fcab94b1ccea8d159 android.hardware.wifi.supplicant@1.0::ISupplicantCallback
  17. 35ba7bcdf18f24a866a7e5429548f06768bb20a257f75b10a397c4d825ef8438 android.hardware.wifi.supplicant@1.0::ISupplicantIface
  18. cda01008c06922fa37c1213e9bb831a109b3174532805616fb7161edc403866f android.hardware.wifi.supplicant@1.0::ISupplicantNetwork
  19. 4907410338c5e8dbeec4b5edc2608ea323f5561945f8810af81810c47b019184 android.hardware.wifi.supplicant@1.0::ISupplicantP2pIface
  20. 8b63f5efa2e3be3a7cb8a428760d82285a4ab79bcbdea6ef90aa547555e582d4 android.hardware.wifi.supplicant@1.0::ISupplicantP2pIfaceCallback
  21. 56128f74560571b6777d59453f35c6b35693ee377e2a23c807708906928f09de android.hardware.wifi.supplicant@1.0::ISupplicantP2pNetwork
  22. 2067c22197bca9743dab66a6f561a8a8375c67b4f76aed05f776839499bd4c8f android.hardware.wifi.supplicant@1.0::ISupplicantP2pNetworkCallback
  23. 7752e1de93aaf5fed37011c219ac247069f6af320b0810daa98510584a10e7b4 android.hardware.wifi.supplicant@1.0::ISupplicantStaIface
  24. d781c8d7e7b3fe5cca8cf6e1d8806e770982ae5358c7816ed51b0f0ec272e70d android.hardware.wifi.supplicant@1.0::ISupplicantStaIfaceCallback
  25. b12ef0bdd8a4d247a8a6e960b227ed32383f2b0241f55d67fcea6eff6a6737fa android.hardware.wifi.supplicant@1.0::ISupplicantStaNetwork
  26. d8f0877ae1d321c1d884c7631dfe36cab0ec8a4b2863d4b687f85d3549a63bcc android.hardware.wifi.supplicant@1.0::ISupplicantStaNetworkCallback
  27. fe3c3c2f572b72f15f8594c538b0577bd5c28722c31879cfe6231330cddb6747 android.hardware.wifi.supplicant@1.0::types

试下如何生成：

对比下hidl-gen生成的和原来的IWifi是否一样：

原来：

b9be36719a8ad534000a51ea07be91be94c405bf1e038ae825acf65087ffd378 android.hardware.wifi@1.0::IWifi

现在：

b9be36719a8ad534000a51ea07be91be94c405bf1e038ae825acf65087ffd378 android.hardware.wifi@1.0::IWifi
 

啊哈，一样的，没毛病。

也可以加::制定具体hidl接口生成hash

 

3. 注册服务

1.1/default/service.cpp

  1. /*
  2.  * Copyright (C) 2016 The Android Open Source Project
  3.  *
  4.  * Licensed under the Apache License, Version 2.0 (the "License");
  5.  * you may not use this file except in compliance with the License.
  6.  * You may obtain a copy of the License at
  7.  *
  8.  *      http://www.apache.org/licenses/LICENSE-2.0
  9.  *
  10.  * Unless required by applicable law or agreed to in writing, software
  11.  * distributed under the License is distributed on an "AS IS" BASIS,
  12.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13.  * See the License for the specific language governing permissions and
  14.  * limitations under the License.
  15.  */
  16.  
  17. #include <android-base/logging.h>
  18. #include <hidl/HidlTransportSupport.h>
  19. #include <utils/Looper.h>
  20. #include <utils/StrongPointer.h>
  21.  
  22. #include "wifi.h"
  23.  
  24. using android::hardware::configureRpcThreadpool;
  25. using android::hardware::joinRpcThreadpool;
  26.  
  27. int main(int /*argc*/, char** argv) {
  28.   android::base::InitLogging(argv,
  29.                              android::base::LogdLogger(android::base::SYSTEM));
  30.   LOG(INFO) << "Wifi Hal is booting up...";
  31.  
  32.   configureRpcThreadpool(1, true /* callerWillJoin */);
  33.  
  34.   // Setup hwbinder service
  35.   android::sp<android::hardware::wifi::V1_1::IWifi> service =
  36.       new android::hardware::wifi::V1_1::implementation::Wifi();
  37.   CHECK_EQ(service->registerAsService(), android::NO_ERROR)
  38.       << "Failed to register wifi HAL";
  39.  
  40.   joinRpcThreadpool();
  41.  
  42.   LOG(INFO) << "Wifi Hal is terminating...";
  43.   return 0;
  44. }

 

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