WiredAccessoryObserver.java revision 237171f8ab476f1d3f9f54777dba62a349d2009a 
1/*
2 * Copyright (C) 2008 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;
18
19import android.app.ActivityManagerNative;
20import android.content.Context;
21import android.content.Intent;
22import android.os.Handler;
23import android.os.Message;
24import android.os.PowerManager;
25import android.os.PowerManager.WakeLock;
26import android.os.UEventObserver;
27import android.util.Slog;
28import android.media.AudioManager;
29import android.util.Log;
30
31import java.io.FileReader;
32import java.io.FileNotFoundException;
33
34/**
35 * <p>WiredAccessoryObserver monitors for a wired headset on the main board or dock.
36 */
37class WiredAccessoryObserver extends UEventObserver {
38    private static final String TAG = WiredAccessoryObserver.class.getSimpleName();
39    private static final boolean LOG = true;
40    private static final int MAX_AUDIO_PORTS = 3; /* h2w, USB Audio & hdmi */
41    private static final String uEventInfo[][] = { {"DEVPATH=/devices/virtual/switch/h2w",
42                                                    "/sys/class/switch/h2w/state",
43                                                    "/sys/class/switch/h2w/name"},
44                                                   {"DEVPATH=/devices/virtual/switch/usb_audio",
45                                                    "/sys/class/switch/usb_audio/state",
46                                                    "/sys/class/switch/usb_audio/name"},
47                                                   {"DEVPATH=/devices/virtual/switch/hdmi",
48                                                    "/sys/class/switch/hdmi/state",
49                                                    "/sys/class/switch/hdmi/name"} };
50
51    private static final int BIT_HEADSET = (1 << 0);
52    private static final int BIT_HEADSET_NO_MIC = (1 << 1);
53    private static final int BIT_USB_HEADSET_ANLG = (1 << 2);
54    private static final int BIT_USB_HEADSET_DGTL = (1 << 3);
55    private static final int BIT_HDMI_AUDIO = (1 << 4);
56    private static final int SUPPORTED_HEADSETS = (BIT_HEADSET|BIT_HEADSET_NO_MIC|
57                                                   BIT_USB_HEADSET_ANLG|BIT_USB_HEADSET_DGTL|
58                                                   BIT_HDMI_AUDIO);
59    private static final int HEADSETS_WITH_MIC = BIT_HEADSET;
60
61    private int mHeadsetState;
62    private int mPrevHeadsetState;
63    private String mHeadsetName;
64    private int switchState;
65
66    private final Context mContext;
67    private final WakeLock mWakeLock;  // held while there is a pending route change
68
69    public WiredAccessoryObserver(Context context) {
70        mContext = context;
71        PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
72        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WiredAccessoryObserver");
73        mWakeLock.setReferenceCounted(false);
74
75        // At any given time both headsets could be inserted
76        // one on the board and one on the dock
77        // observe two UEVENTs
78        for (int i = 0; i < MAX_AUDIO_PORTS; i++) {
79            startObserving(uEventInfo[i][0]);
80        }
81        init();  // set initial status
82    }
83
84    @Override
85    public void onUEvent(UEventObserver.UEvent event) {
86        if (LOG) Slog.v(TAG, "Headset UEVENT: " + event.toString());
87
88        try {
89            if ((event.get("SWITCH_NAME")).equals("usb_audio")) {
90                if (Integer.parseInt(event.get("SWITCH_STATE")) == 1) {
91                    switchState = ((mHeadsetState & (BIT_HEADSET|BIT_HEADSET_NO_MIC|
92                                                     BIT_USB_HEADSET_DGTL)) |
93                                   (Integer.parseInt(event.get("SWITCH_STATE")) << 2));
94                } else if (Integer.parseInt(event.get("SWITCH_STATE")) == 2) {
95                    switchState = ((mHeadsetState & (BIT_HEADSET|BIT_HEADSET_NO_MIC|
96                                                     BIT_USB_HEADSET_ANLG)) |
97                                   (Integer.parseInt(event.get("SWITCH_STATE")) << 3));
98                }
99                else switchState = (mHeadsetState & (BIT_HEADSET|BIT_HEADSET_NO_MIC));
100            }
101            else if ((event.get("SWITCH_NAME")).equals("hdmi")) {
102                switchState = ((mHeadsetState & (BIT_HEADSET|BIT_HEADSET_NO_MIC|
103                                                 BIT_USB_HEADSET_DGTL|BIT_USB_HEADSET_ANLG)) |
104                               (Integer.parseInt(event.get("SWITCH_STATE")) << 4));
105            }
106            else {
107                switchState = ((mHeadsetState & (BIT_USB_HEADSET_ANLG|BIT_USB_HEADSET_DGTL)) |
108                              (Integer.parseInt(event.get("SWITCH_STATE"))));
109            }
110            update(event.get("SWITCH_NAME"), switchState);
111        } catch (NumberFormatException e) {
112            Slog.e(TAG, "Could not parse switch state from event " + event);
113        }
114    }
115
116    private synchronized final void init() {
117        char[] buffer = new char[1024];
118
119        String newName = mHeadsetName;
120        int newState = mHeadsetState;
121        mPrevHeadsetState = mHeadsetState;
122
123        for (int i = 0; i < MAX_AUDIO_PORTS; i++) {
124            try {
125                FileReader file = new FileReader(uEventInfo[i][1]);
126                int len = file.read(buffer, 0, 1024);
127                file.close();
128                newState = Integer.valueOf((new String(buffer, 0, len)).trim());
129
130                file = new FileReader(uEventInfo[i][2]);
131                len = file.read(buffer, 0, 1024);
132                file.close();
133                newName = new String(buffer, 0, len).trim();
134
135            } catch (FileNotFoundException e) {
136                Slog.w(TAG, "This kernel does not have wired headset support");
137            } catch (Exception e) {
138                Slog.e(TAG, "" , e);
139            }
140
141            update(newName, newState);
142        }
143    }
144
145    private synchronized final void update(String newName, int newState) {
146        // Retain only relevant bits
147        int headsetState = newState & SUPPORTED_HEADSETS;
148        int newOrOld = headsetState | mHeadsetState;
149        int delay = 0;
150        int usb_headset_anlg = headsetState & BIT_USB_HEADSET_ANLG;
151        int usb_headset_dgtl = headsetState & BIT_USB_HEADSET_DGTL;
152        int h2w_headset = headsetState & (BIT_HEADSET | BIT_HEADSET_NO_MIC);
153        boolean h2wStateChange = true;
154        boolean usbStateChange = true;
155        // reject all suspect transitions: only accept state changes from:
156        // - a: 0 heaset to 1 headset
157        // - b: 1 headset to 0 headset
158        Log.v(TAG, "newState = "+newState+", headsetState = "+headsetState+", mHeadsetState = "+mHeadsetState);
159        if (mHeadsetState == headsetState || ((h2w_headset & (h2w_headset - 1)) != 0)) {
160            Log.e(TAG, "unsetting h2w flag");
161            h2wStateChange = false;
162        }
163        // - c: 0 usb headset to 1 usb headset
164        // - d: 1 usb headset to 0 usb headset
165        if ((usb_headset_anlg >> 2) == 1 && (usb_headset_dgtl >> 3) == 1) {
166            Log.e(TAG, "unsetting usb flag");
167            usbStateChange = false;
168        }
169        if (!h2wStateChange && !usbStateChange) {
170            Log.e(TAG, "invalid transition, returning ...");
171            return;
172        }
173
174        mHeadsetName = newName;
175        mPrevHeadsetState = mHeadsetState;
176        mHeadsetState = headsetState;
177
178        if (headsetState == 0) {
179            Intent intent = new Intent(AudioManager.ACTION_AUDIO_BECOMING_NOISY);
180            mContext.sendBroadcast(intent);
181            // It can take hundreds of ms flush the audio pipeline after
182            // apps pause audio playback, but audio route changes are
183            // immediate, so delay the route change by 1000ms.
184            // This could be improved once the audio sub-system provides an
185            // interface to clear the audio pipeline.
186            delay = 1000;
187        } else {
188            // Insert the same delay for headset connection so that the connection event is not
189            // broadcast before the disconnection event in case of fast removal/insertion
190            if (mHandler.hasMessages(0)) {
191                delay = 1000;
192            }
193        }
194        mWakeLock.acquire();
195        mHandler.sendMessageDelayed(mHandler.obtainMessage(0,
196                                                           mHeadsetState,
197                                                           mPrevHeadsetState,
198                                                           mHeadsetName),
199                                    delay);
200    }
201
202    private synchronized final void sendIntents(int headsetState, int prevHeadsetState, String headsetName) {
203        int allHeadsets = SUPPORTED_HEADSETS;
204        for (int curHeadset = 1; allHeadsets != 0; curHeadset <<= 1) {
205            if ((curHeadset & allHeadsets) != 0) {
206                sendIntent(curHeadset, headsetState, prevHeadsetState, headsetName);
207                allHeadsets &= ~curHeadset;
208            }
209        }
210    }
211
212    private final void sendIntent(int headset, int headsetState, int prevHeadsetState, String headsetName) {
213        if ((headsetState & headset) != (prevHeadsetState & headset)) {
214
215            int state = 0;
216            if ((headsetState & headset) != 0) {
217                state = 1;
218            }
219            if((headset == BIT_USB_HEADSET_ANLG) || (headset == BIT_USB_HEADSET_DGTL) ||
220               (headset == BIT_HDMI_AUDIO)) {
221                Intent intent;
222
223                //  Pack up the values and broadcast them to everyone
224                if (headset == BIT_USB_HEADSET_ANLG) {
225                    intent = new Intent(Intent.ACTION_USB_ANLG_HEADSET_PLUG);
226                    intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
227                    intent.putExtra("state", state);
228                    intent.putExtra("name", headsetName);
229                    ActivityManagerNative.broadcastStickyIntent(intent, null);
230                } else if (headset == BIT_USB_HEADSET_DGTL) {
231                    intent = new Intent(Intent.ACTION_USB_DGTL_HEADSET_PLUG);
232                    intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
233                    intent.putExtra("state", state);
234                    intent.putExtra("name", headsetName);
235                    ActivityManagerNative.broadcastStickyIntent(intent, null);
236                } else if (headset == BIT_HDMI_AUDIO) {
237                    intent = new Intent(Intent.ACTION_HDMI_AUDIO_PLUG);
238                    intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
239                    intent.putExtra("state", state);
240                    intent.putExtra("name", headsetName);
241                    ActivityManagerNative.broadcastStickyIntent(intent, null);
242                }
243
244                if (LOG) Slog.v(TAG, "Intent.ACTION_USB_HEADSET_PLUG: state: "+state+" name: "+headsetName);
245                // TODO: Should we require a permission?
246            }
247            if((headset == BIT_HEADSET) || (headset == BIT_HEADSET_NO_MIC)) {
248
249                //  Pack up the values and broadcast them to everyone
250                Intent intent = new Intent(Intent.ACTION_HEADSET_PLUG);
251                intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
252                //int state = 0;
253                int microphone = 0;
254
255                if ((headset & HEADSETS_WITH_MIC) != 0) {
256                    microphone = 1;
257                }
258
259                intent.putExtra("state", state);
260                intent.putExtra("name", headsetName);
261                intent.putExtra("microphone", microphone);
262
263                if (LOG) Slog.v(TAG, "Intent.ACTION_HEADSET_PLUG: state: "+state+" name: "+headsetName+" mic: "+microphone);
264                // TODO: Should we require a permission?
265                ActivityManagerNative.broadcastStickyIntent(intent, null);
266            }
267        }
268    }
269
270    private final Handler mHandler = new Handler() {
271        @Override
272        public void handleMessage(Message msg) {
273            sendIntents(msg.arg1, msg.arg2, (String)msg.obj);
274            mWakeLock.release();
275        }
276    };
277}
278