1/*
2 * Copyright (C) 2014 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.services.telephony;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.os.AsyncResult;
24import android.os.Handler;
25import android.os.Message;
26import android.telecom.TelecomManager;
27
28import com.android.internal.telephony.Phone;
29
30final class TtyManager {
31    private final static int MSG_SET_TTY_MODE_RESPONSE = 1;
32    private final static int MSG_GET_TTY_MODE_RESPONSE = 2;
33
34    private final TtyBroadcastReceiver mReceiver = new TtyBroadcastReceiver();
35    private final Phone mPhone;
36    private int mTtyMode;
37    private int mUiTtyMode = -1;
38
39    private final Handler mHandler = new Handler() {
40        @Override
41        public void handleMessage(Message msg) {
42            switch (msg.what) {
43                case MSG_SET_TTY_MODE_RESPONSE: {
44                    Log.v(TtyManager.this, "got setTtyMode response");
45                    AsyncResult ar = (AsyncResult) msg.obj;
46                    if (ar.exception != null) {
47                        Log.d(TtyManager.this, "setTTYMode exception: %s", ar.exception);
48                    }
49                    mPhone.queryTTYMode(obtainMessage(MSG_GET_TTY_MODE_RESPONSE));
50                    break;
51                }
52                case MSG_GET_TTY_MODE_RESPONSE: {
53                    Log.v(TtyManager.this, "got queryTTYMode response");
54                    AsyncResult ar = (AsyncResult) msg.obj;
55                    if (ar.exception != null) {
56                        Log.d(TtyManager.this, "queryTTYMode exception: %s", ar.exception);
57                    } else {
58                        int ttyMode = phoneModeToTelecomMode(((int[]) ar.result)[0]);
59                        if (ttyMode != mTtyMode) {
60                            Log.d(TtyManager.this, "setting TTY mode failed, attempted %d, got: %d",
61                                    mTtyMode, ttyMode);
62                        } else {
63                            Log.d(TtyManager.this, "setting TTY mode to %d succeeded", ttyMode);
64                        }
65                    }
66                    break;
67                }
68            }
69        }
70    };
71
72    TtyManager(Context context, Phone phone) {
73        mPhone = phone;
74
75        IntentFilter intentFilter = new IntentFilter(
76                TelecomManager.ACTION_CURRENT_TTY_MODE_CHANGED);
77        intentFilter.addAction(TelecomManager.ACTION_TTY_PREFERRED_MODE_CHANGED);
78        context.registerReceiver(mReceiver, intentFilter);
79
80        int ttyMode = TelecomManager.TTY_MODE_OFF;
81        TelecomManager telecomManager = TelecomManager.from(context);
82        if (telecomManager != null) {
83            ttyMode = telecomManager.getCurrentTtyMode();
84        }
85        updateTtyMode(ttyMode);
86        updateUiTtyMode(ttyMode);
87    }
88
89    private void updateTtyMode(int ttyMode) {
90        Log.v(this, "updateTtyMode %d -> %d", mTtyMode, ttyMode);
91        mTtyMode = ttyMode;
92        mPhone.setTTYMode(telecomModeToPhoneMode(ttyMode),
93                mHandler.obtainMessage(MSG_SET_TTY_MODE_RESPONSE));
94    }
95
96    private void updateUiTtyMode(int ttyMode) {
97        Log.i(this, "updateUiTtyMode %d -> %d", mUiTtyMode, ttyMode);
98        if(mUiTtyMode != ttyMode) {
99            mUiTtyMode = ttyMode;
100            mPhone.setUiTTYMode(telecomModeToPhoneMode(ttyMode), null);
101        } else {
102           Log.i(this, "ui tty mode didnt change");
103        }
104    }
105
106    private final class TtyBroadcastReceiver extends BroadcastReceiver {
107        @Override
108        public void onReceive(Context context, Intent intent) {
109            String action = intent.getAction();
110            Log.v(TtyManager.this, "onReceive, action: %s", action);
111            if (action.equals(TelecomManager.ACTION_CURRENT_TTY_MODE_CHANGED)) {
112                int ttyMode = intent.getIntExtra(
113                        TelecomManager.EXTRA_CURRENT_TTY_MODE, TelecomManager.TTY_MODE_OFF);
114                updateTtyMode(ttyMode);
115            } else if (action.equals(TelecomManager.ACTION_TTY_PREFERRED_MODE_CHANGED)) {
116                int newPreferredTtyMode = intent.getIntExtra(
117                        TelecomManager.EXTRA_TTY_PREFERRED_MODE, TelecomManager.TTY_MODE_OFF);
118                updateUiTtyMode(newPreferredTtyMode);
119            }
120        }
121    }
122
123    private static int telecomModeToPhoneMode(int telecomMode) {
124        switch (telecomMode) {
125            // AT command only has 0 and 1, so mapping VCO
126            // and HCO to FULL
127            case TelecomManager.TTY_MODE_FULL:
128            case TelecomManager.TTY_MODE_VCO:
129            case TelecomManager.TTY_MODE_HCO:
130                return Phone.TTY_MODE_FULL;
131            default:
132                return Phone.TTY_MODE_OFF;
133        }
134    }
135
136    private static int phoneModeToTelecomMode(int phoneMode) {
137        switch (phoneMode) {
138            case Phone.TTY_MODE_FULL:
139                return TelecomManager.TTY_MODE_FULL;
140            case Phone.TTY_MODE_VCO:
141                return TelecomManager.TTY_MODE_VCO;
142            case Phone.TTY_MODE_HCO:
143                return TelecomManager.TTY_MODE_HCO;
144            case Phone.TTY_MODE_OFF:
145            default:
146                return TelecomManager.TTY_MODE_OFF;
147        }
148    }
149}
150