Bug 1031239 - Part 2: Select clientId for emergency call. r=hsinyi

dom/system/gonk/RadioInterfaceLayer.js

@@ -1576,6 +1576,15 @@ RadioInterfaceLayer.prototype = {
     return this.radioInterfaces[clientId];
   },
 
+  getClientIdForEmergencyCall: function() {
+    for (let cid = 0; cid < this.numRadioInterfaces; ++cid) {
+      if (gRadioEnabledController._isRadioAbleToEnableAtClient(cid)) {
+        return cid;
+      }
+    }
+    return -1;
+  },
+
   setMicrophoneMuted: function(muted) {
     for (let clientId = 0; clientId < this.numRadioInterfaces; clientId++) {
       let radioInterface = this.radioInterfaces[clientId];

dom/system/gonk/nsIRadioInterfaceLayer.idl

@@ -93,12 +93,19 @@ interface nsIRadioInterface : nsISupports
   void getNeighboringCellIds(in nsINeighboringCellIdsCallback callback);
 };
 
-[scriptable, uuid(d035c32e-b491-11e3-9f9d-c716fab88bd6)]
+[scriptable, uuid(78b65e8c-68e7-4510-9a05-65bba12b283e)]
 interface nsIRadioInterfaceLayer : nsISupports
 {
   readonly attribute unsigned long numRadioInterfaces;
 
   nsIRadioInterface getRadioInterface(in unsigned long clientId);
 
+  /**
+   * Select a proper client for dialing emergency call.
+   *
+   * @return clientId or -1 if none of the clients are avaialble.
+   */
+  unsigned long getClientIdForEmergencyCall();
+
   void setMicrophoneMuted(in boolean muted);
 };

dom/telephony/gonk/TelephonyService.js

@@ -413,6 +413,16 @@ TelephonyService.prototype = {
       return;
     }
 
+    // Select a proper clientId for dialEmergency.
+    if (aIsEmergency) {
+      aClientId = gRadioInterfaceLayer.getClientIdForEmergencyCall() ;
+      if (aClientId === -1) {
+        if (DEBUG) debug("Error: No client is avaialble for emergency call.");
+        aTelephonyCallback.notifyDialError(DIAL_ERROR_INVALID_STATE_ERROR);
+        return;
+      }
+    }
+
     // For DSDS, if there is aleady a call on SIM 'aClientId', we cannot place
     // any new call on other SIM.
     if (this._hasCallsOnOtherClient(aClientId)) {