Add Emergency Call Routing in HAL

Some countries or carriers require some emergency numbers that must
be handled with normal call routing or emergency routing.

In multi-sim senario, this radio request will be sent through the IRadio
service that serves the subscription the emergency number belongs to,
no matter of the PUK/PIN state of the subscription and the service state.

Test: Treehugger
Bug: 112657134
Change-Id: Iaa9768226dc2d7d2d66a9678823ba7d0047a1988
Merged-In: Iaa9768226dc2d7d2d66a9678823ba7d0047a1988
(cherry picked from commit dd49ad675e)

radio/1.4/Android.bp

@@ -30,6 +30,7 @@ hidl_interface {
         "DataConnActiveStatus",
         "DataProfileInfo",
         "DataRegStateResult",
+        "EmergencyCallRouting",
         "EmergencyNumber",
         "EmergencyNumberSource",
         "EmergencyServiceCategory",

radio/1.4/IRadio.hal

@@ -21,6 +21,7 @@ import @1.2::DataRequestReason;
 import @1.3::IRadio;
 import @1.4::AccessNetwork;
 import @1.4::DataProfileInfo;
+import @1.4::EmergencyCallRouting;
 import @1.4::EmergencyServiceCategory;
 import @1.4::RadioAccessFamily;
 
@@ -101,21 +102,26 @@ interface IRadio extends @1.3::IRadio {
     oneway setDataProfile_1_4(int32_t serial, vec<DataProfileInfo> profiles);
 
     /**
-     * Initiate emergency voice call, with zero or more emergency service category(s).
+     * Initiate emergency voice call, with zero or more emergency service category(s) and routing
+     * information for handling the call. Android uses this request to make its emergency call
+     * instead of using @1.0::IRadio.dial if the 'address' in the 'dialInfo' field is identified
+     * as an emergency number by Android.
      *
-     * Note this API is the same as IRadio.dial except using the
-     * @1.4::EmergencyServiceCategory as the input param.
+     * In multi-sim senario, this radio request is sent through the IRadio service that serves
+     * the subscription the emergency number belongs to, no matter of the PUK/PIN state of the
+     * subscription and the service state.
      *
-     * If the number in the 'dialInfo' field is identified as an emergency number in Android,
-     * Android use this request for its emergency call instead of @1.0::IRadio.dial. The
-     * implementation decides how to handle the call (e.g. emergency routing or normal
-     * routing).
+     * Some countries or carriers require some emergency numbers that must be handled with normal
+     * call routing or emergency routing. If the 'routing' field is specified as
+     * @1.4::EmergencyNumberRouting#NORMAL, the implementation must use normal call routing to
+     * handle the call; if it is specified as @1.4::EmergencyNumberRouting#EMERGENCY, the
+     * implementation must use emergency routing to handle the call; if it is
+     * @1.4::EmergencyNumberRouting#UNKNOWN, Android does not know how to handle the call.
      *
      * If the dialed emergency number does not have a specified emergency service category, the
-     * 'categories' field is set to @1.4::EmergencyServiceCategory#UNSPECIFIED; iff either the
-     * 'categories' field is set to @1.4::EmergencyServiceCategory#UNSPECIFIED or the underlying
+     * 'categories' field is set to @1.4::EmergencyServiceCategory#UNSPECIFIED; if the underlying
      * technology used to request emergency services does not support the emergency service
-     * category, the interpretation of the categories is defined by implementation.
+     * category, the categories may be ignored.
      *
      * Reference: 3gpp TS 22.101, Section 10 - Emergency Calls
      *
@@ -123,11 +129,12 @@ interface IRadio extends @1.3::IRadio {
      * @param dialInfo the same @1.0::Dial information used by @1.0::IRadio.dial.
      * @param categories bitfield<@1.4::EmergencyServiceCategory> the Emergency Service Category(s)
      *     of the call.
+     * @param routing @1.4::EmergencyCallRouting the emergency call routing information.
      *
      * Response function is IRadioResponse.emergencyDialResponse()
      */
     oneway emergencyDial(int32_t serial, Dial dialInfo,
-            bitfield<EmergencyServiceCategory> categories);
+            bitfield<EmergencyServiceCategory> categories, EmergencyCallRouting routing);
 
     /**
      * Query the preferred network type bitmap.

radio/1.4/IRadioIndication.hal

@@ -27,17 +27,17 @@ interface IRadioIndication extends @1.3::IRadioIndication {
      * Report the current list of emergency numbers
      *
      * Each emergency number (@1.4::EmergencyNumber) in the emergency number list contains a
-     * dialing number, zero or more service category(s), mobile country code, and source(s) that
-     * indicate where it comes from.
+     * dialing number, zero or more service category(s), mobile country code, mobile network code,
+     * and source(s) that indicate where it comes from.
      *
-     * Radio must report all the valid emergency numbers with known mobile country code and
-     * emergency service categories from all available sources including network signaling, sim,
-     * modem/oem configuration, and default configuration (112 and 911 must be always available;
-     * additionally, 000, 08, 110, 999, 118 and 119 must be available when sim is not present).
-     * Radio shall not report emergency numbers that are invalid in the current locale. The
-     * reported emergency number list must not have duplicate @1.4::EmergencyNumber entries. Please
-     * refer the documentation of @1.4::EmergencyNumber to construct each emergency number to
-     * report.
+     * Radio must report all the valid emergency numbers with known mobile country code, mobile
+     * network code and emergency service categories from all available sources including network
+     * signaling, sim, modem/oem configuration, and default configuration (112 and 911 must be
+     * always available; additionally, 000, 08, 110, 999, 118 and 119 must be available when sim
+     * is not present). Radio shall not report emergency numbers that are invalid in the current
+     * locale. The reported emergency number list must not have duplicate @1.4::EmergencyNumber
+     * entries. Please refer the documentation of @1.4::EmergencyNumber to construct each
+     * emergency number to report.
      *
      * Radio must report the complete list of emergency numbers whenever the emergency numbers in
      * the list are changed or whenever the client and the radio server are connected.

radio/1.4/types.hal

@@ -54,7 +54,7 @@ enum AccessNetwork : @1.2::AccessNetwork {
 
 /**
  * Emergency number contains information of number, one or more service category(s), mobile country
- * code (mcc), and source(s) that indicate where it comes from.
+ * code (mcc), mobile network country (mnc) and source(s) that indicate where it comes from.
  *
  * If the source of the emergency number is associated with country, field ‘mcc’ must be provided;
  * otherwise the field ‘mcc’ must be an empty string.
@@ -156,6 +156,25 @@ enum EmergencyNumberSource : int32_t {
     DEFAULT = 1 << 3,
 };
 
+/**
+ * Indicates how the implementation should handle the emergency call if it is required by Android.
+ */
+enum EmergencyCallRouting : int32_t {
+    /**
+     * Indicates Android does not require how to handle the corresponding emergency call; it is
+     * decided by implementation.
+     */
+    UNKNOWN = 0,
+    /**
+     * Indicates the implementation must handle the call through emergency routing.
+     */
+    EMERGENCY = 1,
+    /**
+     * Indicates the implementation must handle the call through normal call routing.
+     */
+    NORMAL = 2,
+};
+
 enum RadioTechnology : @1.0::RadioTechnology {
     /** 5G NR. */
     NR = 20,