1 /* 2 * Copyright (C) 2017 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 #ifndef CHRE_WIFI_OFFLOAD_CHANNEL_HISTOGRAM_H_ 18 #define CHRE_WIFI_OFFLOAD_CHANNEL_HISTOGRAM_H_ 19 20 #include "chre/apps/wifi_offload/wifi_offload.h" 21 22 #include "chre/apps/wifi_offload/flatbuffers_types_generated.h" 23 24 namespace wifi_offload { 25 26 /** 27 * A class to keep scan count for each channel. It provides an indexer to access 28 * each channel's scan count with channel number. 29 */ 30 class ChannelHistogram { 31 public: 32 static constexpr uint8_t kNumChannels = 69; 33 34 ChannelHistogram(); 35 36 ~ChannelHistogram() = default; 37 38 static bool IsSupportedFrequency(uint32_t frequency); 39 40 /* Gets the scaled scan count for a given channel number. All scan counts are 41 * scaled such that the largest non-zero count is always mapped to 255 */ 42 uint8_t GetChannelScanCount(uint8_t channel_number) const; 43 44 bool IncrementScanCountForFrequency(uint32_t frequency); 45 46 bool IncrementScanCountForFrequencyForTest(uint32_t frequency, 47 uint32_t increase_count); 48 49 bool IncrementScanCountForChannelForTest(uint8_t channel, 50 uint32_t increase_count); 51 52 bool operator==(const ChannelHistogram &other) const; 53 54 flatbuffers::Offset<flatbuffers::Vector<uint8_t>> Serialize( 55 flatbuffers::FlatBufferBuilder *builder) const; 56 57 bool Deserialize(const flatbuffers::Vector<uint8_t> &fbs_scan_count); 58 59 private: 60 uint32_t scan_count_internal_high_res_[kNumChannels]; 61 }; 62 63 } // namespace wifi_offload 64 65 #endif // CHRE_WIFI_OFFLOAD_CHANNEL_HISTOGRAM_H_ 66