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Fix issue: 2413494: [Passion-c] Add TTY support.

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Handle TTY mode change events received by HeadsetObserver and send information down to AudioHardware with AudioManager.setParameters()

Use setting "tty_mode_uses_heaset_events" in core config.xml to indicate if the product uses this particular
method of indicating the TTY mode change.
This commit is contained in:
Eric Laurent
2010-02-02 09:42:33 -08:00
parent 8a6c060719
commit aead64def1
2 changed files with 55 additions and 0 deletions
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4
core/res/res/values/config.xml
View File

@@ -218,4 +218,8 @@
<!-- Component name of the default wallpaper. This will be ImageWallpaper if not
specified -->
<string name="default_wallpaper_component">@null</string>
<!-- Flag indicating whether headset events are used by kernel to indicate
TTY mode changes. -->
<bool name="tty_mode_uses_headset_events">false</bool>
</resources>

51
services/java/com/android/server/HeadsetObserver.java
View File

@@ -53,6 +53,19 @@ class HeadsetObserver extends UEventObserver {
private final Context mContext;
private final WakeLock mWakeLock; // held while there is a pending route change
private boolean mHandleTTY;
private int mTTYState;
private AudioManager mAudioManager = null;
// special use of bits in headset state received from kernel made by some
// platforms to indicate changes in TTY mode.
private static final int BIT_TTY_OFF = 0;
private static final int BIT_TTY_FULL = (1 << 2);
private static final int BIT_TTY_VCO = (1 << 5);
private static final int BIT_TTY_HCO = (1 << 6);
private static final int TTY_BITS_MASK = (BIT_TTY_FULL | BIT_TTY_VCO | BIT_TTY_HCO);
public HeadsetObserver(Context context) {
mContext = context;
PowerManager pm = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
@@ -61,6 +74,11 @@ class HeadsetObserver extends UEventObserver {
startObserving(HEADSET_UEVENT_MATCH);
// read settings for TTY mode indication method
mHandleTTY = context.getResources().getBoolean(
com.android.internal.R.bool.tty_mode_uses_headset_events);
mTTYState = BIT_TTY_OFF;
init(); // set initial status
}
@@ -100,6 +118,39 @@ class HeadsetObserver extends UEventObserver {
}
private synchronized final void update(String newName, int newState) {
// handle TTY state change first
if (mHandleTTY) {
int ttyState = newState & TTY_BITS_MASK;
if (ttyState != mTTYState) {
String ttyMode;
switch (ttyState) {
case BIT_TTY_FULL:
ttyMode = "tty_full";
break;
case BIT_TTY_VCO:
ttyMode = "tty_vco";
break;
case BIT_TTY_HCO:
ttyMode = "tty_hco";
break;
case BIT_TTY_OFF:
ttyMode = "tty_off";
break;
default:
ttyMode = "tty_invalid";
break;
}
if (ttyMode != "tty_invalid") {
mTTYState = ttyState;
if (mAudioManager == null) {
mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
}
mAudioManager.setParameters("tty_mode="+ttyMode);
}
}
}
// Retain only relevant bits
int headsetState = newState & SUPPORTED_HEADSETS;
int newOrOld = headsetState | mHeadsetState;