wifi/1.0-legacy/wifi_feature_flags.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 "wifi_feature_flags.h"

namespace android {
namespace hardware {
namespace wifi {
namespace V1_3 {
namespace implementation {
namespace feature_flags {

using V1_0::ChipModeId;
using V1_0::IfaceType;
using V1_0::IWifiChip;

/* The chip may either have a single mode supporting any number of combinations,
 * or a fixed dual-mode (so it involves firmware loading to switch between
 * modes) setting. If there is a need to support more modes, it needs to be
 * implemented manually in WiFi HAL (see changeFirmwareMode in
 * WifiChip::handleChipConfiguration).
 *
 * Supported combinations are defined in device's makefile, for example:
 *    WIFI_HAL_INTERFACE_COMBINATIONS := {{{STA, AP}, 1}, {{P2P, NAN}, 1}},
 *    WIFI_HAL_INTERFACE_COMBINATIONS += {{{STA}, 1}, {{AP}, 2}}
 * What means:
 *    Interface combination 1: 1 STA or AP and 1 P2P or NAN concurrent iface
 *                             operations.
 *    Interface combination 2: 1 STA and 2 AP concurrent iface operations.
 *
 * For backward compatibility, the following makefile flags can be used to
 * generate combinations list:
 *  - WIFI_HIDL_FEATURE_DUAL_INTERFACE
 *  - WIFI_HIDL_FEATURE_DISABLE_AP
 *  - WIFI_HIDL_FEATURE_AWARE
 * However, they are ignored if WIFI_HAL_INTERFACE_COMBINATIONS was provided.
 * With WIFI_HIDL_FEATURE_DUAL_INTERFACE flag set, there is a single mode with
 * two interface combinations:
 *    Interface Combination 1: Will support 1 STA and 1 P2P or NAN (optional)
 *                             concurrent iface operations.
 *    Interface Combination 2: Will support 1 STA and 1 AP concurrent
 *                             iface operations.
 *
 * The only dual-mode configuration supported is for alternating STA and AP
 * mode, that may involve firmware reloading. In such case, there are 2 separate
 * modes of operation with 1 interface combination each:
 *    Mode 1 (STA mode): Will support 1 STA and 1 P2P or NAN (optional)
 *                       concurrent iface operations.
 *    Mode 2 (AP mode): Will support 1 AP iface operation.
 *
 * If Aware is enabled, the iface combination will be modified to support either
 * P2P or NAN in place of just P2P.
 */
// clang-format off
#ifdef WIFI_HAL_INTERFACE_COMBINATIONS
constexpr ChipModeId kMainModeId = chip_mode_ids::kV3;
#elif defined(WIFI_HIDL_FEATURE_DUAL_INTERFACE)
// former V2 (fixed dual interface) setup expressed as V3
constexpr ChipModeId kMainModeId = chip_mode_ids::kV3;
#  ifdef WIFI_HIDL_FEATURE_DISABLE_AP
#    ifdef WIFI_HIDL_FEATURE_AWARE
//     1 STA + 1 of (P2P or NAN)
#      define WIFI_HAL_INTERFACE_COMBINATIONS {{{STA}, 1}, {{P2P, NAN}, 1}}
#    else
//     1 STA + 1 P2P
#      define WIFI_HAL_INTERFACE_COMBINATIONS {{{STA}, 1}, {{P2P}, 1}}
#    endif
#  else
#    ifdef WIFI_HIDL_FEATURE_AWARE
//     (1 STA + 1 AP) or (1 STA + 1 of (P2P or NAN))
#      define WIFI_HAL_INTERFACE_COMBINATIONS {{{STA}, 1}, {{AP}, 1}},\
                                              {{{STA}, 1}, {{P2P, NAN}, 1}}
#    else
//     (1 STA + 1 AP) or (1 STA + 1 P2P)
#      define WIFI_HAL_INTERFACE_COMBINATIONS {{{STA}, 1}, {{AP}, 1}},\
                                              {{{STA}, 1}, {{P2P}, 1}}
#    endif
#  endif
#else
// V1 (fixed single interface, dual-mode chip)
constexpr ChipModeId kMainModeId = chip_mode_ids::kV1Sta;
#  ifdef WIFI_HIDL_FEATURE_AWARE
//   1 STA + 1 of (P2P or NAN)
#    define WIFI_HAL_INTERFACE_COMBINATIONS {{{STA}, 1}, {{P2P, NAN}, 1}}
#  else
//   1 STA + 1 P2P
#    define WIFI_HAL_INTERFACE_COMBINATIONS {{{STA}, 1}, {{P2P}, 1}}
#  endif

#  ifndef WIFI_HIDL_FEATURE_DISABLE_AP
#    define WIFI_HAL_INTERFACE_COMBINATIONS_AP {{{AP}, 1}}
#  endif
#endif
// clang-format on

/**
 * Helper class to convert a collection of combination limits to a combination.
 *
 * The main point here is to simplify the syntax required by
 * WIFI_HAL_INTERFACE_COMBINATIONS.
 */
struct ChipIfaceCombination
    : public hidl_vec<IWifiChip::ChipIfaceCombinationLimit> {
    ChipIfaceCombination(
        const std::initializer_list<IWifiChip::ChipIfaceCombinationLimit> list)
        : hidl_vec(list) {}

    operator IWifiChip::ChipIfaceCombination() const { return {*this}; }

    static hidl_vec<IWifiChip::ChipIfaceCombination> make_vec(
        const std::initializer_list<ChipIfaceCombination> list) {
        return hidl_vec<IWifiChip::ChipIfaceCombination>(  //
            std::begin(list), std::end(list));
    }
};

#define STA IfaceType::STA
#define AP IfaceType::AP
#define P2P IfaceType::P2P
#define NAN IfaceType::NAN
static const std::vector<IWifiChip::ChipMode> kChipModes{
    {kMainModeId,
     ChipIfaceCombination::make_vec({WIFI_HAL_INTERFACE_COMBINATIONS})},
#ifdef WIFI_HAL_INTERFACE_COMBINATIONS_AP
    {chip_mode_ids::kV1Ap,
     ChipIfaceCombination::make_vec({WIFI_HAL_INTERFACE_COMBINATIONS_AP})},
#endif
};
#undef STA
#undef AP
#undef P2P
#undef NAN

#ifndef WIFI_HIDL_FEATURE_AP_MAC_RANDOMIZATION
static const bool wifiHidlFeatureDisableApMacRandomization = true;
#else
static const bool wifiHidlFeatureDisableApMacRandomization = false;
#endif  // WIFI_HIDL_FEATURE_AP_MAC_RANDOMIZATION

WifiFeatureFlags::WifiFeatureFlags() {}

std::vector<IWifiChip::ChipMode> WifiFeatureFlags::getChipModes() {
    return kChipModes;
}

bool WifiFeatureFlags::isApMacRandomizationDisabled() {
    return wifiHidlFeatureDisableApMacRandomization;
}

}  // namespace feature_flags
}  // namespace implementation
}  // namespace V1_3
}  // namespace wifi
}  // namespace hardware
}  // namespace android