237 lines
9.2 KiB
Java
237 lines
9.2 KiB
Java
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Copyright (c) 2010, The Linux Foundation. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server;
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import android.app.ActivityManagerNative;
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import android.content.Context;
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import android.content.Intent;
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import android.os.Handler;
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import android.os.Message;
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import android.os.PowerManager;
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import android.os.PowerManager.WakeLock;
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import android.os.UEventObserver;
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import android.util.Slog;
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import android.media.AudioManager;
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import java.io.FileReader;
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import java.io.FileNotFoundException;
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/**
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* <p>HeadsetObserver monitors for a wired headset.
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*/
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class HeadsetObserver extends UEventObserver {
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private static final String TAG = HeadsetObserver.class.getSimpleName();
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private static final boolean LOG = true;
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private static final String HEADSET_UEVENT_MATCH = "DEVPATH=/devices/virtual/switch/h2w";
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private static final String HEADSET_STATE_PATH = "/sys/class/switch/h2w/state";
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private static final String HEADSET_NAME_PATH = "/sys/class/switch/h2w/name";
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private static final int BIT_HEADSET = (1 << 0);
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private static final int BIT_HEADSET_SPEAKER_ONLY = (1 << 1);
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private static final int BIT_HEADSET_MIC_ONLY = (1 << 2);
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private static final int BIT_ANCHEADSET = (1 << 3);
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private static final int BIT_ANCHEADSET_SPEAKER_ONLY = (1 << 4);
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private static final int BIT_ANCHEADSET_MIC_ONLY = (1 << 5);
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private static final int SUPPORTED_HEADSETS = (BIT_HEADSET|BIT_HEADSET_SPEAKER_ONLY|BIT_HEADSET_MIC_ONLY |
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BIT_ANCHEADSET|BIT_ANCHEADSET_SPEAKER_ONLY|BIT_ANCHEADSET_MIC_ONLY );
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private static final int HEADSETS_WITH_MIC_AND_SPEAKER = BIT_HEADSET;
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private static final int HEADSETS_WITH_SPEAKER_ONLY = BIT_HEADSET_SPEAKER_ONLY;
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private static final int HEADSETS_WITH_MIC_ONLY = BIT_HEADSET_MIC_ONLY;
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private static final int ANCHEADSETS_WITH_MIC_AND_SPEAKER = BIT_ANCHEADSET;
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private static final int ANCHEADSETS_WITH_SPEAKER_ONLY = BIT_ANCHEADSET_SPEAKER_ONLY;
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private static final int ANCHEADSETS_WITH_MIC_ONLY = BIT_ANCHEADSET_MIC_ONLY;
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private int mHeadsetState;
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private int mPrevHeadsetState;
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private String mHeadsetName;
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private final Context mContext;
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private final WakeLock mWakeLock; // held while there is a pending route change
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public HeadsetObserver(Context context) {
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mContext = context;
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PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
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mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "HeadsetObserver");
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mWakeLock.setReferenceCounted(false);
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startObserving(HEADSET_UEVENT_MATCH);
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init(); // set initial status
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}
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@Override
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public void onUEvent(UEventObserver.UEvent event) {
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if (LOG) Slog.v(TAG, "Headset UEVENT: " + event.toString());
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try {
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update(event.get("SWITCH_NAME"), Integer.parseInt(event.get("SWITCH_STATE")));
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} catch (NumberFormatException e) {
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Slog.e(TAG, "Could not parse switch state from event " + event);
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}
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}
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private synchronized final void init() {
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char[] buffer = new char[1024];
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String newName = mHeadsetName;
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int newState = mHeadsetState;
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mPrevHeadsetState = mHeadsetState;
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try {
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FileReader file = new FileReader(HEADSET_STATE_PATH);
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int len = file.read(buffer, 0, 1024);
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newState = Integer.valueOf((new String(buffer, 0, len)).trim());
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file = new FileReader(HEADSET_NAME_PATH);
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len = file.read(buffer, 0, 1024);
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newName = new String(buffer, 0, len).trim();
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} catch (FileNotFoundException e) {
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Slog.w(TAG, "This kernel does not have wired headset support");
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} catch (Exception e) {
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Slog.e(TAG, "" , e);
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}
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update(newName, newState);
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}
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private synchronized final void update(String newName, int newState) {
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// Retain only relevant bits
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int headsetState = newState & SUPPORTED_HEADSETS;
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int delay = 0;
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// reject all suspect transitions: only accept state changes from:
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// - a: 0 heaset to 1 headset
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// - b: 1 headset to 0 headset
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if (mHeadsetState == headsetState) {
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return;
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}
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mHeadsetName = newName;
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mPrevHeadsetState = mHeadsetState;
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mHeadsetState = headsetState;
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if (headsetState == 0) {
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Intent intent = new Intent(AudioManager.ACTION_AUDIO_BECOMING_NOISY);
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mContext.sendBroadcast(intent);
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// It can take hundreds of ms flush the audio pipeline after
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// apps pause audio playback, but audio route changes are
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// immediate, so delay the route change by 1000ms.
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// This could be improved once the audio sub-system provides an
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// interface to clear the audio pipeline.
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delay = 1000;
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} else {
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// Insert the same delay for headset connection so that the connection event is not
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// broadcast before the disconnection event in case of fast removal/insertion
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if (mHandler.hasMessages(0)) {
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delay = 1000;
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}
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}
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mWakeLock.acquire();
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mHandler.sendMessageDelayed(mHandler.obtainMessage(0,
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mHeadsetState,
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mPrevHeadsetState,
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mHeadsetName),
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delay);
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}
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private synchronized final void sendIntents(int headsetState, int prevHeadsetState, String headsetName) {
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int allHeadsets = SUPPORTED_HEADSETS;
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//Handle unplug events first and then handle plug-in events
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for (int curHeadset = 1; curHeadset < SUPPORTED_HEADSETS; curHeadset <<= 1) {
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if (((headsetState & curHeadset) == 0) && ((prevHeadsetState & curHeadset) == curHeadset)) {
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if ((curHeadset & allHeadsets) != 0) {
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sendIntent(curHeadset, headsetState, prevHeadsetState, headsetName);
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allHeadsets &= ~curHeadset;
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}
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}
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}
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for (int curHeadset = 1; curHeadset < SUPPORTED_HEADSETS; curHeadset <<= 1) {
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if (((headsetState & curHeadset) == curHeadset) && ((prevHeadsetState & curHeadset) == 0)) {
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if ((curHeadset & allHeadsets) != 0) {
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sendIntent(curHeadset, headsetState, prevHeadsetState, headsetName);
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allHeadsets &= ~curHeadset;
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}
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}
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}
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}
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private final void sendIntent(int headset, int headsetState, int prevHeadsetState, String headsetName) {
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if ((headsetState & headset) != (prevHeadsetState & headset)) {
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// Pack up the values and broadcast them to everyone
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Intent intent = new Intent(Intent.ACTION_HEADSET_PLUG);
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intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
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int state = 0;
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int microphone = 0;
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int speaker = 0;
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int anc = 0;
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if ((headset & HEADSETS_WITH_SPEAKER_ONLY) != 0) {
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speaker = 1;
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}
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if ((headset & HEADSETS_WITH_MIC_AND_SPEAKER) != 0) {
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microphone = 1;
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speaker = 1;
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}
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if ((headset & HEADSETS_WITH_MIC_ONLY) != 0) {
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microphone = 1;
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}
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if ((headset & ANCHEADSETS_WITH_SPEAKER_ONLY) != 0) {
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speaker = 1;
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anc = 1;
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}
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if ((headset & ANCHEADSETS_WITH_MIC_AND_SPEAKER) != 0) {
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microphone = 1;
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speaker = 1;
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anc = 1;
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}
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if ((headset & ANCHEADSETS_WITH_MIC_ONLY) != 0) {
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microphone = 1;
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anc = 1;
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}
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if ((headsetState & headset) != 0) {
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state = 1;
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}
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intent.putExtra("state", state);
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intent.putExtra("name", headsetName);
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intent.putExtra("microphone", microphone);
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intent.putExtra("speaker", speaker);
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intent.putExtra("anc", anc);
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if (LOG) Slog.v(TAG, "Intent.ACTION_HEADSET_PLUG: state: "+state+" name: "+headsetName+" mic: "+microphone+" speaker: "+speaker + "anc: " + anc);
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// TODO: Should we require a permission?
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ActivityManagerNative.broadcastStickyIntent(intent, null);
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}
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}
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private final Handler mHandler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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sendIntents(msg.arg1, msg.arg2, (String)msg.obj);
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mWakeLock.release();
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}
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};
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}
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