Fix issue: 2413494: Add TTY support.

This is a new implementation of TTY support.
Previous implementation in commit aead64def1fe58c95c086a0ca00cf0b13fa32ef1 is reverted.
The new method does not rely any more on the kernel headset driver to send a UEvent containing
current TTY mode.

1 files changed, 21 insertions, 0 deletions

diff --git a/telephony/java/com/android/internal/telephony/cdma/TtyIntent.java b/telephony/java/com/android/internal/telephony/cdma/TtyIntent.java
index f27f79c..3813b1d 100644
--- a/telephony/java/com/android/internal/telephony/cdma/TtyIntent.java
+++ b/telephony/java/com/android/internal/telephony/cdma/TtyIntent.java
@@ -43,4 +43,25 @@ public class TtyIntent {
      */
     public static final String TTY_ENABLED = "ttyEnabled";
 
+    /**
+     * Broadcast intent action indicating that the TTY preferred operating mode
+     * has changed. An intent extra provides the new mode as an int.
+     * @see #TTY_PREFFERED_MODE
+     *
+     * {@hide}
+     */
+    public static final String TTY_PREFERRED_MODE_CHANGE_ACTION =
+        "com.android.internal.telephony.cdma.intent.action.TTY_PREFERRED_MODE_CHANGE";
+
+    /**
+     * The lookup key for an int that indicates preferred TTY mode.
+     * Valid modes are:
+     * - {@link Phone.TTY_MODE_OFF}
+     * - {@link Phone.TTY_MODE_FULL}
+     * - {@link Phone.TTY_MODE_HCO}
+     * - {@link Phone.TTY_MODE_VCO}
+     *
+     * {@hide}
+     */
+    public static final String TTY_PREFFERED_MODE = "ttyPreferredMode";
 }