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（八十一）探索hidl-gen使用及IWifi.hal 实现

程序员文章站 2022-06-08 20:42:48
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1.文件路径

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

/*
 * Copyright 2016 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.
 */

package aaa@qq.com;

import IWifiChip;
import IWifiEventCallback;

/**
 * This is the root of the HAL module and is the interface returned when
 * loading an implementation of the Wi-Fi HAL. There must be at most one
 * module loaded in the system.
 */
interface IWifi {
  /**
   * Requests notifications of significant events for the HAL. Multiple calls to
   * this must register multiple callbacks each of which must receive all
   * events. |IWifiEventCallback| object registration must be independent of the
   * state of the rest of the HAL and must persist though stops/starts. These
   * objects must be deleted when the corresponding client process is dead.
   *
   * @param callback An instance of the |IWifiEventCallback| HIDL interface
   *        object.
   * @return status WifiStatus of the operation.
   *         Possible status codes:
   *         |WifiStatusCode.SUCCESS|,
   *         |WifiStatusCode.UNKNOWN|
   */
  @entry
  @callflow(next={"*"})
  registerEventCallback(IWifiEventCallback callback)
      generates (WifiStatus status);

  /**
   * Get the current state of the HAL.
   *
   * @return started true if started, false otherwise.
   */
  isStarted() generates (bool started);

  /**
   * Perform any setup that is required to make use of the module. If the module
   * is already started then this must be a noop.
   * Must trigger |IWifiEventCallback.onStart| on success.
   *
   * @return status WifiStatus of the operation.
   *         Possible status codes:
   *         |WifiStatusCode.SUCCESS|,
   *         |WifiStatusCode.NOT_AVAILABLE|,
   *         |WifiStatusCode.UNKNOWN|
   */
  @entry
  @callflow(next={"registerEventCallback", "start", "stop", "getChip"})
  start() generates (WifiStatus status);

  /**
   * Tear down any state, ongoing commands, etc. If the module is already
   * stopped then this must be a noop. If the HAL is already stopped or it
   * succeeds then onStop must be called. After calling this all IWifiChip
   * objects will be considered invalid.
   * Must trigger |IWifiEventCallback.onStop| on success.
   * Must trigger |IWifiEventCallback.onFailure| on failure.
   *
   * Calling stop then start is a valid way of resetting state in the HAL,
   * driver, firmware.
   *
   * @return status WifiStatus of the operation.
   *         Possible status codes:
   *         |WifiStatusCode.SUCCESS|,
   *         |WifiStatusCode.NOT_STARTED|,
   *         |WifiStatusCode.UNKNOWN|
   */
  @exit
  @callflow(next={"registerEventCallback", "start", "stop"})
  stop() generates (WifiStatus status);

  /**
   * Retrieve the list of all chip Id's on the device.
   * The corresponding |IWifiChip| object for any chip can be
   * retrieved using |getChip| method.
   *
   * @return status WifiStatus of the operation.
   *         Possible status codes:
   *         |WifiStatusCode.SUCCESS|,
   *         |WifiStatusCode.NOT_STARTED|,
   *         |WifiStatusCode.UNKNOWN|
   * @return chipIds List of all chip Id's on the device.
   */
  @callflow(next={"*"})
  getChipIds() generates (WifiStatus status, vec<ChipId> chipIds);

  /**
   * Gets a HIDL interface object for the chip corresponding to the
   * provided chipId.
   *
   * @return status WifiStatus of the operation.
   *         Possible status codes:
   *         |WifiStatusCode.SUCCESS|,
   *         |WifiStatusCode.NOT_STARTED|,
   *         |WifiStatusCode.UNKNOWN|
   * @return chip HIDL interface object representing the chip.
   */
  @callflow(next={"*"})
  getChip(ChipId chipId) generates (WifiStatus status, IWifiChip chip);
};

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

// This file is autogenerated by hidl-gen. Do not edit manually.

filegroup {
    name: "aaa@qq.com_hal",
    srcs: [
        "types.hal",
        "IWifi.hal",
        "IWifiApIface.hal",
        "IWifiChip.hal",
        "IWifiChipEventCallback.hal",
        "IWifiEventCallback.hal",
        "IWifiIface.hal",
        "IWifiNanIface.hal",
        "IWifiNanIfaceEventCallback.hal",
        "IWifiP2pIface.hal",
        "IWifiRttController.hal",
        "IWifiRttControllerEventCallback.hal",
        "IWifiStaIface.hal",
        "IWifiStaIfaceEventCallback.hal",
    ],
}

genrule {
    name: "aaa@qq.com_genc++",
    tools: ["hidl-gen"],
    cmd: "$(location hidl-gen) -o $(genDir) -Lc++-sources -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport aaa@qq.com",
    srcs: [
        ":aaa@qq.com_hal",
    ],
    out: [
        "android/hardware/wifi/1.0/types.cpp",
        "android/hardware/wifi/1.0/WifiAll.cpp",
        "android/hardware/wifi/1.0/WifiApIfaceAll.cpp",
        "android/hardware/wifi/1.0/WifiChipAll.cpp",
        "android/hardware/wifi/1.0/WifiChipEventCallbackAll.cpp",
        "android/hardware/wifi/1.0/WifiEventCallbackAll.cpp",
        "android/hardware/wifi/1.0/WifiIfaceAll.cpp",
        "android/hardware/wifi/1.0/WifiNanIfaceAll.cpp",
        "android/hardware/wifi/1.0/WifiNanIfaceEventCallbackAll.cpp",
        "android/hardware/wifi/1.0/WifiP2pIfaceAll.cpp",
        "android/hardware/wifi/1.0/WifiRttControllerAll.cpp",
        "android/hardware/wifi/1.0/WifiRttControllerEventCallbackAll.cpp",
        "android/hardware/wifi/1.0/WifiStaIfaceAll.cpp",
        "android/hardware/wifi/1.0/WifiStaIfaceEventCallbackAll.cpp",
    ],
}

genrule {
    name: "aaa@qq.com_genc++_headers",
    tools: ["hidl-gen"],
    cmd: "$(location hidl-gen) -o $(genDir) -Lc++-headers -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport aaa@qq.com",
    srcs: [
        ":aaa@qq.com_hal",
    ],
    out: [
        "android/hardware/wifi/1.0/types.h",
        "android/hardware/wifi/1.0/hwtypes.h",
        "android/hardware/wifi/1.0/IWifi.h",
        "android/hardware/wifi/1.0/IHwWifi.h",
        "android/hardware/wifi/1.0/BnHwWifi.h",
        "android/hardware/wifi/1.0/BpHwWifi.h",
        "android/hardware/wifi/1.0/BsWifi.h",
        "android/hardware/wifi/1.0/IWifiApIface.h",
        "android/hardware/wifi/1.0/IHwWifiApIface.h",
        "android/hardware/wifi/1.0/BnHwWifiApIface.h",
        "android/hardware/wifi/1.0/BpHwWifiApIface.h",
        "android/hardware/wifi/1.0/BsWifiApIface.h",
        "android/hardware/wifi/1.0/IWifiChip.h",
        "android/hardware/wifi/1.0/IHwWifiChip.h",
        "android/hardware/wifi/1.0/BnHwWifiChip.h",
        "android/hardware/wifi/1.0/BpHwWifiChip.h",
        "android/hardware/wifi/1.0/BsWifiChip.h",
        "android/hardware/wifi/1.0/IWifiChipEventCallback.h",
        "android/hardware/wifi/1.0/IHwWifiChipEventCallback.h",
        "android/hardware/wifi/1.0/BnHwWifiChipEventCallback.h",
        "android/hardware/wifi/1.0/BpHwWifiChipEventCallback.h",
        "android/hardware/wifi/1.0/BsWifiChipEventCallback.h",
        "android/hardware/wifi/1.0/IWifiEventCallback.h",
        "android/hardware/wifi/1.0/IHwWifiEventCallback.h",
        "android/hardware/wifi/1.0/BnHwWifiEventCallback.h",
        "android/hardware/wifi/1.0/BpHwWifiEventCallback.h",
        "android/hardware/wifi/1.0/BsWifiEventCallback.h",
        "android/hardware/wifi/1.0/IWifiIface.h",
        "android/hardware/wifi/1.0/IHwWifiIface.h",
        "android/hardware/wifi/1.0/BnHwWifiIface.h",
        "android/hardware/wifi/1.0/BpHwWifiIface.h",
        "android/hardware/wifi/1.0/BsWifiIface.h",
        "android/hardware/wifi/1.0/IWifiNanIface.h",
        "android/hardware/wifi/1.0/IHwWifiNanIface.h",
        "android/hardware/wifi/1.0/BnHwWifiNanIface.h",
        "android/hardware/wifi/1.0/BpHwWifiNanIface.h",
        "android/hardware/wifi/1.0/BsWifiNanIface.h",
        "android/hardware/wifi/1.0/IWifiNanIfaceEventCallback.h",
        "android/hardware/wifi/1.0/IHwWifiNanIfaceEventCallback.h",
        "android/hardware/wifi/1.0/BnHwWifiNanIfaceEventCallback.h",
        "android/hardware/wifi/1.0/BpHwWifiNanIfaceEventCallback.h",
        "android/hardware/wifi/1.0/BsWifiNanIfaceEventCallback.h",
        "android/hardware/wifi/1.0/IWifiP2pIface.h",
        "android/hardware/wifi/1.0/IHwWifiP2pIface.h",
        "android/hardware/wifi/1.0/BnHwWifiP2pIface.h",
        "android/hardware/wifi/1.0/BpHwWifiP2pIface.h",
        "android/hardware/wifi/1.0/BsWifiP2pIface.h",
        "android/hardware/wifi/1.0/IWifiRttController.h",
        "android/hardware/wifi/1.0/IHwWifiRttController.h",
        "android/hardware/wifi/1.0/BnHwWifiRttController.h",
        "android/hardware/wifi/1.0/BpHwWifiRttController.h",
        "android/hardware/wifi/1.0/BsWifiRttController.h",
        "android/hardware/wifi/1.0/IWifiRttControllerEventCallback.h",
        "android/hardware/wifi/1.0/IHwWifiRttControllerEventCallback.h",
        "android/hardware/wifi/1.0/BnHwWifiRttControllerEventCallback.h",
        "android/hardware/wifi/1.0/BpHwWifiRttControllerEventCallback.h",
        "android/hardware/wifi/1.0/BsWifiRttControllerEventCallback.h",
        "android/hardware/wifi/1.0/IWifiStaIface.h",
        "android/hardware/wifi/1.0/IHwWifiStaIface.h",
        "android/hardware/wifi/1.0/BnHwWifiStaIface.h",
        "android/hardware/wifi/1.0/BpHwWifiStaIface.h",
        "android/hardware/wifi/1.0/BsWifiStaIface.h",
        "android/hardware/wifi/1.0/IWifiStaIfaceEventCallback.h",
        "android/hardware/wifi/1.0/IHwWifiStaIfaceEventCallback.h",
        "android/hardware/wifi/1.0/BnHwWifiStaIfaceEventCallback.h",
        "android/hardware/wifi/1.0/BpHwWifiStaIfaceEventCallback.h",
        "android/hardware/wifi/1.0/BsWifiStaIfaceEventCallback.h",
    ],
}

cc_library {
    name: "aaa@qq.com",
    defaults: ["hidl-module-defaults"],
    generated_sources: ["aaa@qq.com_genc++"],
    generated_headers: ["aaa@qq.com_genc++_headers"],
    export_generated_headers: ["aaa@qq.com_genc++_headers"],
    vendor_available: true,
    vndk: {
        enabled: true,
    },
    shared_libs: [
        "libhidlbase",
        "libhidltransport",
        "libhwbinder",
        "liblog",
        "libutils",
        "libcutils",
    ],
    export_shared_lib_headers: [
        "libhidlbase",
        "libhidltransport",
        "libhwbinder",
        "libutils",
    ],
}

简单地看下这个Android.bp文件：

filegroup-"aaa@qq.com_hal"：包含了该目录下所有的hal文件

genrule-"aaa@qq.com_genc++"：使用上面的filegroup作为src编译出对应的cpp文件

genrule-"aaa@qq.com_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“aaa@qq.com”经常看到，调用到wifi hal的都会声明到这个。

cc_library {
    name: "aaa@qq.com",
    defaults: ["hidl-module-defaults"],
    generated_sources: ["aaa@qq.com_genc++"],
    generated_headers: ["aaa@qq.com_genc++_headers"],
    export_generated_headers: ["aaa@qq.com_genc++_headers"],
    vendor_available: true,
    vndk: {
        enabled: true,
    },
    shared_libs: [
        "libhidlbase",
        "libhidltransport",
        "libhwbinder",
        "liblog",
        "libutils",
        "libcutils",
    ],
    export_shared_lib_headers: [
        "libhidlbase",
        "libhidltransport",
        "libhwbinder",
        "libutils",
    ],
}

 

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 aaa@qq.com"

先期准备

1)source build/envsetup.sh

2)lunch

3)make hidl-gen -j4

//[100% 460/460] Install: out/host/linux-x86/bin/hidl-gen

（八十一）探索hidl-gen使用及IWifi.hal 实现

 

2.1.1 生成c++-sources

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

（八十一）探索hidl-gen使用及IWifi.hal 实现

 

2.1.2 生成c++-headers

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

（八十一）探索hidl-gen使用及IWifi.hal 实现

 

2.1.3 生成Android.bp

cmd: "$(location hidl-gen) -o $(genDir) -Landroidbp -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport aaa@qq.com"

（八十一）探索hidl-gen使用及IWifi.hal 实现

生成的Android.bp文件是和之前一摸一样的。

2.1.4 生成Android.mk

（八十一）探索hidl-gen使用及IWifi.hal 实现

 

2.1.5 生成androidbp-impl

 hidl-gen -o ./test_hidl_wifi/ -Landroidbp-impl -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport aaa@qq.com

cc_library_shared {
    name: "aaa@qq.com",
    relative_install_path: "hw",
    proprietary: true,
    srcs: [
        "Wifi.cpp",
        "WifiApIface.cpp",
        "WifiChip.cpp",
        "WifiChipEventCallback.cpp",
        "WifiEventCallback.cpp",
        "WifiIface.cpp",
        "WifiNanIface.cpp",
        "WifiNanIfaceEventCallback.cpp",
        "WifiP2pIface.cpp",
        "WifiRttController.cpp",
        "WifiRttControllerEventCallback.cpp",
        "WifiStaIface.cpp",
        "WifiStaIfaceEventCallback.cpp",
    ],
    shared_libs: [
        "libhidlbase",
        "libhidltransport",
        "libutils",
        "aaa@qq.com",
    ],
}

 

2.1.6 生成c++-impl

（八十一）探索hidl-gen使用及IWifi.hal 实现生成HIDL的默认实现。

看下Wifi.h和Wifi.cpp

#ifndef ANDROID_HARDWARE_WIFI_V1_0_WIFI_H
#define ANDROID_HARDWARE_WIFI_V1_0_WIFI_H

#include <android/hardware/wifi/1.0/IWifi.h>
#include <hidl/MQDescriptor.h>
#include <hidl/Status.h>

namespace android {
namespace hardware {
namespace wifi {
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 Wifi : public IWifi {
    // Methods from IWifi follow.
    Return<void> registerEventCallback(const sp<IWifiEventCallback>& callback, registerEventCallback_cb _hidl_cb) override;
    Return<bool> isStarted() override;
    Return<void> start(start_cb _hidl_cb) override;
    Return<void> stop(stop_cb _hidl_cb) override;
    Return<void> getChipIds(getChipIds_cb _hidl_cb) override;
    Return<void> getChip(uint32_t chipId, getChip_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" IWifi* HIDL_FETCH_IWifi(const char* name);

}  // namespace implementation
}  // namespace V1_0
}  // namespace wifi
}  // namespace hardware
}  // namespace android

#endif  // ANDROID_HARDWARE_WIFI_V1_0_WIFI_H

 

#include "Wifi.h"

namespace android {
namespace hardware {
namespace wifi {
namespace V1_0 {
namespace implementation {

// Methods from IWifi follow.
Return<void> Wifi::registerEventCallback(const sp<IWifiEventCallback>& callback, registerEventCallback_cb _hidl_cb) {
    // TODO implement
    return Void();
}

Return<bool> Wifi::isStarted() {
    // TODO implement
    return bool {};
}

Return<void> Wifi::start(start_cb _hidl_cb) {
    // TODO implement
    return Void();
}

Return<void> Wifi::stop(stop_cb _hidl_cb) {
    // TODO implement
    return Void();
}

Return<void> Wifi::getChipIds(getChipIds_cb _hidl_cb) {
    // TODO implement
    return Void();
}

Return<void> Wifi::getChip(uint32_t chipId, getChip_cb _hidl_cb) {
    // TODO implement
    return Void();
}


// Methods from ::android::hidl::base::V1_0::IBase follow.

//IWifi* HIDL_FETCH_IWifi(const char* /* name */) {
//    return new Wifi();
//}

}  // namespace implementation
}  // namespace V1_0
}  // namespace wifi
}  // namespace hardware
}  // 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。

（八十一）探索hidl-gen使用及IWifi.hal 实现

/*
 * Copyright (C) 2016 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.
 */

#include <android-base/logging.h>

#include "hidl_return_util.h"
#include "wifi.h"
#include "wifi_status_util.h"

namespace {
// Chip ID to use for the only supported chip.
static constexpr android::hardware::wifi::V1_0::ChipId kChipId = 0;
}  // namespace

namespace android {
namespace hardware {
namespace wifi {
namespace V1_1 {
namespace implementation {
using hidl_return_util::validateAndCall;
using hidl_return_util::validateAndCallWithLock;

Wifi::Wifi()
    : legacy_hal_(new legacy_hal::WifiLegacyHal()),
      mode_controller_(new mode_controller::WifiModeController()),
      run_state_(RunState::STOPPED) {}

bool Wifi::isValid() {
  // This object is always valid.
  return true;
}

Return<void> Wifi::registerEventCallback(
    const sp<IWifiEventCallback>& event_callback,
    registerEventCallback_cb hidl_status_cb) {
  return validateAndCall(this,
                         WifiStatusCode::ERROR_UNKNOWN,
                         &Wifi::registerEventCallbackInternal,
                         hidl_status_cb,
                         event_callback);
}

Return<bool> Wifi::isStarted() {
  return run_state_ != RunState::STOPPED;
}

Return<void> Wifi::start(start_cb hidl_status_cb) {
  return validateAndCall(this,
                         WifiStatusCode::ERROR_UNKNOWN,
                         &Wifi::startInternal,
                         hidl_status_cb);
}

Return<void> Wifi::stop(stop_cb hidl_status_cb) {
  return validateAndCallWithLock(this, WifiStatusCode::ERROR_UNKNOWN,
                                 &Wifi::stopInternal, hidl_status_cb);
}

Return<void> Wifi::getChipIds(getChipIds_cb hidl_status_cb) {
  return validateAndCall(this,
                         WifiStatusCode::ERROR_UNKNOWN,
                         &Wifi::getChipIdsInternal,
                         hidl_status_cb);
}

Return<void> Wifi::getChip(ChipId chip_id, getChip_cb hidl_status_cb) {
  return validateAndCall(this,
                         WifiStatusCode::ERROR_UNKNOWN,
                         &Wifi::getChipInternal,
                         hidl_status_cb,
                         chip_id);
}

WifiStatus Wifi::registerEventCallbackInternal(
    const sp<IWifiEventCallback>& event_callback) {
  if (!event_cb_handler_.addCallback(event_callback)) {
    return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
  }
  return createWifiStatus(WifiStatusCode::SUCCESS);
}

WifiStatus Wifi::startInternal() {
  if (run_state_ == RunState::STARTED) {
    return createWifiStatus(WifiStatusCode::SUCCESS);
  } else if (run_state_ == RunState::STOPPING) {
    return createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE,
                            "HAL is stopping");
  }
  WifiStatus wifi_status = initializeLegacyHal();
  if (wifi_status.code == WifiStatusCode::SUCCESS) {
    // Create the chip instance once the HAL is started.
    chip_ = new WifiChip(kChipId, legacy_hal_, mode_controller_);
    run_state_ = RunState::STARTED;
    for (const auto& callback : event_cb_handler_.getCallbacks()) {
      if (!callback->onStart().isOk()) {
        LOG(ERROR) << "Failed to invoke onStart callback";
      };
    }
    LOG(INFO) << "Wifi HAL started";
  } else {
    for (const auto& callback : event_cb_handler_.getCallbacks()) {
      if (!callback->onFailure(wifi_status).isOk()) {
        LOG(ERROR) << "Failed to invoke onFailure callback";
      }
    }
    LOG(ERROR) << "Wifi HAL start failed";
  }
  return wifi_status;
}

WifiStatus Wifi::stopInternal(
    /* NONNULL */ std::unique_lock<std::recursive_mutex>* lock) {
  if (run_state_ == RunState::STOPPED) {
    return createWifiStatus(WifiStatusCode::SUCCESS);
  } else if (run_state_ == RunState::STOPPING) {
    return createWifiStatus(WifiStatusCode::ERROR_NOT_AVAILABLE,
                            "HAL is stopping");
  }
  // Clear the chip object and its child objects since the HAL is now
  // stopped.
  if (chip_.get()) {
    chip_->invalidate();
    chip_.clear();
  }
  WifiStatus wifi_status = stopLegacyHalAndDeinitializeModeController(lock);
  if (wifi_status.code == WifiStatusCode::SUCCESS) {
    for (const auto& callback : event_cb_handler_.getCallbacks()) {
      if (!callback->onStop().isOk()) {
        LOG(ERROR) << "Failed to invoke onStop callback";
      };
    }
    LOG(INFO) << "Wifi HAL stopped";
  } else {
    for (const auto& callback : event_cb_handler_.getCallbacks()) {
      if (!callback->onFailure(wifi_status).isOk()) {
        LOG(ERROR) << "Failed to invoke onFailure callback";
      }
    }
    LOG(ERROR) << "Wifi HAL stop failed";
  }
  return wifi_status;
}

std::pair<WifiStatus, std::vector<ChipId>> Wifi::getChipIdsInternal() {
  std::vector<ChipId> chip_ids;
  if (chip_.get()) {
    chip_ids.emplace_back(kChipId);
  }
  return {createWifiStatus(WifiStatusCode::SUCCESS), std::move(chip_ids)};
}

std::pair<WifiStatus, sp<IWifiChip>> Wifi::getChipInternal(ChipId chip_id) {
  if (!chip_.get()) {
    return {createWifiStatus(WifiStatusCode::ERROR_NOT_STARTED), nullptr};
  }
  if (chip_id != kChipId) {
    return {createWifiStatus(WifiStatusCode::ERROR_INVALID_ARGS), nullptr};
  }
  return {createWifiStatus(WifiStatusCode::SUCCESS), chip_};
}

WifiStatus Wifi::initializeLegacyHal() {
  legacy_hal::wifi_error legacy_status = legacy_hal_->initialize();
  if (legacy_status != legacy_hal::WIFI_SUCCESS) {
    LOG(ERROR) << "Failed to initialize legacy HAL: "
               << legacyErrorToString(legacy_status);
    return createWifiStatusFromLegacyError(legacy_status);
  }
  return createWifiStatus(WifiStatusCode::SUCCESS);
}

WifiStatus Wifi::stopLegacyHalAndDeinitializeModeController(
    /* NONNULL */ std::unique_lock<std::recursive_mutex>* lock) {
  run_state_ = RunState::STOPPING;
  legacy_hal::wifi_error legacy_status =
      legacy_hal_->stop(lock, [&]() { run_state_ = RunState::STOPPED; });
  if (legacy_status != legacy_hal::WIFI_SUCCESS) {
    LOG(ERROR) << "Failed to stop legacy HAL: "
               << legacyErrorToString(legacy_status);
    return createWifiStatusFromLegacyError(legacy_status);
  }
  if (!mode_controller_->deinitialize()) {
    LOG(ERROR) << "Failed to deinitialize firmware mode controller";
    return createWifiStatus(WifiStatusCode::ERROR_UNKNOWN);
  }
  return createWifiStatus(WifiStatusCode::SUCCESS);
}
}  // namespace implementation
}  // namespace V1_1
}  // namespace wifi
}  // namespace hardware
}  // 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：

b9be36719a8ad534000a51ea07be91be94c405bf1e038ae825acf65087ffd378 aaa@qq.com::IWifi
ee0224ee18813506d9d6f13d8c8e4679f053c290a443a52a7c52a5d3c852262b aaa@qq.com::IWifiApIface
f3eecc489deb4c74892f59eb7adb769063bd5c354ac132b626a5f42b363d36bc aaa@qq.com::IWifiChip
a1b988377645a58e5e2542ca2bad4e17c21a4a389213d05de2f0e32d57b7d339 aaa@qq.com::IWifiChipEventCallback
5ed6760ce77e84bc6c49d1acb3f7d8117c9176b3f06514bc44ad3af84c80dcfe aaa@qq.com::IWifiEventCallback
6b9ad43a5efbe6ca214f751e22ce43cf5cd4d5d5f2cba80f24ccd3755a72401c aaa@qq.com::IWifiIface
ba5aa74f1ba714f0093864227923492808795bda6199c4ea0891322d27f8c931 aaa@qq.com::IWifiNanIface
325c94f3e1a565b56bbc74faddbd0ba7cb824f263dccf9dfff2daf62b86ed774 aaa@qq.com::IWifiNanIfaceEventCallback
c2c3f0372b41780fb6dfe83c022296806c2024d7046682fd201de5aa9b791c7a aaa@qq.com::IWifiP2pIface
766e9765f5c9c759b2a763c2288353fb5deff3389c2cc28f81d79c939704ce8b aaa@qq.com::IWifiRttController
72ab6f3e120cbf07aa6f8e87ca89112bdeb36b7fbb96bce5af3712323ab8b8e6 aaa@qq.com::IWifiRttControllerEventCallback
3b8093d39ef1e10e43c5538afbf5ff6e39b8d8168ebbe1998d993e89e25f14a5 aaa@qq.com::IWifiStaIface
7fbfc551c3e23c8b4398c3e16e452b516457e6921424a53474cbf373ca306fa9 aaa@qq.com::IWifiStaIfaceEventCallback
e20d5132d6d23e072c15de065b5e2aa13ff965031246a2c82581732bae56bf6d aaa@qq.com::types
f7e55c08187d8c855068a1ee3d0c8daeee7570292d96509c21a8756d4f5cfb9b aaa@qq.com::ISupplicant
56b5c7267cb3d3337f44eb8b0b38ff4c6260dcc70e07687fcab94b1ccea8d159 aaa@qq.com::ISupplicantCallback
35ba7bcdf18f24a866a7e5429548f06768bb20a257f75b10a397c4d825ef8438 aaa@qq.com::ISupplicantIface
cda01008c06922fa37c1213e9bb831a109b3174532805616fb7161edc403866f aaa@qq.com::ISupplicantNetwork
4907410338c5e8dbeec4b5edc2608ea323f5561945f8810af81810c47b019184 aaa@qq.com::ISupplicantP2pIface
8b63f5efa2e3be3a7cb8a428760d82285a4ab79bcbdea6ef90aa547555e582d4 aaa@qq.com::ISupplicantP2pIfaceCallback
56128f74560571b6777d59453f35c6b35693ee377e2a23c807708906928f09de aaa@qq.com::ISupplicantP2pNetwork
2067c22197bca9743dab66a6f561a8a8375c67b4f76aed05f776839499bd4c8f aaa@qq.com::ISupplicantP2pNetworkCallback
7752e1de93aaf5fed37011c219ac247069f6af320b0810daa98510584a10e7b4 aaa@qq.com::ISupplicantStaIface
d781c8d7e7b3fe5cca8cf6e1d8806e770982ae5358c7816ed51b0f0ec272e70d aaa@qq.com::ISupplicantStaIfaceCallback
b12ef0bdd8a4d247a8a6e960b227ed32383f2b0241f55d67fcea6eff6a6737fa aaa@qq.com::ISupplicantStaNetwork
d8f0877ae1d321c1d884c7631dfe36cab0ec8a4b2863d4b687f85d3549a63bcc aaa@qq.com::ISupplicantStaNetworkCallback
fe3c3c2f572b72f15f8594c538b0577bd5c28722c31879cfe6231330cddb6747 aaa@qq.com::types

试下如何生成：

（八十一）探索hidl-gen使用及IWifi.hal 实现

对比下hidl-gen生成的和原来的IWifi是否一样：

原来：

b9be36719a8ad534000a51ea07be91be94c405bf1e038ae825acf65087ffd378 aaa@qq.com::IWifi

现在：

b9be36719a8ad534000a51ea07be91be94c405bf1e038ae825acf65087ffd378 aaa@qq.com::IWifi
 

啊哈，一样的，没毛病。

也可以加::制定具体hidl接口生成hash

（八十一）探索hidl-gen使用及IWifi.hal 实现

 

3. 注册服务

1.1/default/service.cpp

/*
 * Copyright (C) 2016 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.
 */

#include <android-base/logging.h>
#include <hidl/HidlTransportSupport.h>
#include <utils/Looper.h>
#include <utils/StrongPointer.h>

#include "wifi.h"

using android::hardware::configureRpcThreadpool;
using android::hardware::joinRpcThreadpool;

int main(int /*argc*/, char** argv) {
  android::base::InitLogging(argv,
                             android::base::LogdLogger(android::base::SYSTEM));
  LOG(INFO) << "Wifi Hal is booting up...";

  configureRpcThreadpool(1, true /* callerWillJoin */);

  // Setup hwbinder service
  android::sp<android::hardware::wifi::V1_1::IWifi> service =
      new android::hardware::wifi::V1_1::implementation::Wifi();
  CHECK_EQ(service->registerAsService(), android::NO_ERROR)
      << "Failed to register wifi HAL";

  joinRpcThreadpool();

  LOG(INFO) << "Wifi Hal is terminating...";
  return 0;
}

 

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