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Commit aead64de authored by Eric Laurent's avatar Eric Laurent
Browse files

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

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.
parent 8a6c0607

core/res/res/values/config.xml

+4 −0
Original line number Diff line number Diff line
@@ -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>

services/java/com/android/server/HeadsetObserver.java

+51 −0
Original line number Diff line number Diff line
@@ -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;