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
17package com.android.server.wifi.scanner;
18
19import android.net.wifi.WifiScanner;
20import android.util.Log;
21
22import com.android.server.wifi.WifiNative;
23
24/**
25 * KnownBandsChannelHelper that uses band to channel mappings retrieved from wificond.
26 * Also supporting updating the channel list from the wificond on demand.
27 */
28public class WificondChannelHelper extends KnownBandsChannelHelper {
29    private static final String TAG = "WificondChannelHelper";
30
31    private final WifiNative mWifiNative;
32
33    public WificondChannelHelper(WifiNative wifiNative) {
34        mWifiNative = wifiNative;
35        final int[] emptyFreqList = new int[0];
36        setBandChannels(emptyFreqList, emptyFreqList, emptyFreqList);
37        updateChannels();
38    }
39
40    @Override
41    public void updateChannels() {
42        int[] channels24G =
43                mWifiNative.getChannelsForBand(WifiScanner.WIFI_BAND_24_GHZ);
44        if (channels24G == null) Log.e(TAG, "Failed to get channels for 2.4GHz band");
45        int[] channels5G = mWifiNative.getChannelsForBand(WifiScanner.WIFI_BAND_5_GHZ);
46        if (channels5G == null) Log.e(TAG, "Failed to get channels for 5GHz band");
47        int[] channelsDfs =
48                mWifiNative.getChannelsForBand(WifiScanner.WIFI_BAND_5_GHZ_DFS_ONLY);
49        if (channelsDfs == null) Log.e(TAG, "Failed to get channels for 5GHz DFS only band");
50        if (channels24G == null || channels5G == null || channelsDfs == null) {
51            Log.e(TAG, "Failed to get all channels for band, not updating band channel lists");
52        } else if (channels24G.length > 0 || channels5G.length > 0 || channelsDfs.length > 0) {
53            setBandChannels(channels24G, channels5G, channelsDfs);
54        } else {
55            Log.e(TAG, "Got zero length for all channel lists");
56        }
57    }
58}
59