Add an optional vendor_cause string to

RIL_REQUEST_LAST_CALL_FAIL_CAUSE's response.
This vendor cause string will be passed to Telecom's DisconnectCause,
which could help us figure out why we are seeing so many ERROR_UNSPECIFIED.
bug:17701976

Original partner change:
https://partner-android-review.googlesource.com/#/c/215710/

Change-Id: I0c54733a03b2fe2bd48b3d3b21efc5e3ebd9ef66

3 files changed, 36 insertions, 1 deletions

diff --git a/include/telephony/ril.h b/include/telephony/ril.h
index 8cde697..2e71367 100644
--- a/include/telephony/ril.h
+++ b/include/telephony/ril.h
@@ -616,6 +616,11 @@ typedef enum {
     CALL_FAIL_ERROR_UNSPECIFIED = 0xffff
 } RIL_LastCallFailCause;
 
+typedef struct {
+  RIL_LastCallFailCause cause_code;
+  char *                vendor_cause;
+} RIL_LastCallFailCauseInfo;
+
 /* See RIL_REQUEST_LAST_DATA_CALL_FAIL_CAUSE */
 typedef enum {
     PDP_FAIL_NONE = 0, /* No error, connection ok */
diff --git a/libril/ril.cpp b/libril/ril.cpp
index 32c4376..a27495e 100644
--- a/libril/ril.cpp
+++ b/libril/ril.cpp
@@ -270,6 +270,7 @@ static void dispatchSimAuthentication(Parcel &p, RequestInfo *pRI);
 static void dispatchDataProfile(Parcel &p, RequestInfo *pRI);
 static void dispatchRadioCapability(Parcel &p, RequestInfo *pRI);
 static int responseInts(Parcel &p, void *response, size_t responselen);
+static int responseFailCause(Parcel &p, void *response, size_t responselen);
 static int responseStrings(Parcel &p, void *response, size_t responselen);
 static int responseString(Parcel &p, void *response, size_t responselen);
 static int responseVoid(Parcel &p, void *response, size_t responselen);
@@ -2170,6 +2171,35 @@ responseInts(Parcel &p, void *response, size_t responselen) {
     return 0;
 }
 
+// Response is an int or RIL_LastCallFailCauseInfo.
+// Currently, only Shamu plans to use RIL_LastCallFailCauseInfo.
+// TODO(yjl): Let all implementations use RIL_LastCallFailCauseInfo.
+static int responseFailCause(Parcel &p, void *response, size_t responselen) {
+    if (response == NULL && responselen != 0) {
+        RLOGE("invalid response: NULL");
+        return RIL_ERRNO_INVALID_RESPONSE;
+    }
+
+    if (responselen == sizeof(int)) {
+      return responseInts(p, response, responselen);
+    } else if (responselen == sizeof(RIL_LastCallFailCauseInfo)) {
+      startResponse;
+      RIL_LastCallFailCauseInfo *p_fail_cause_info = (RIL_LastCallFailCauseInfo *) response;
+      appendPrintBuf("%s[cause_code=%d,vendor_cause=%s]", printBuf, p_fail_cause_info->cause_code,
+                     p_fail_cause_info->vendor_cause);
+      p.writeInt32(p_fail_cause_info->cause_code);
+      writeStringToParcel(p, p_fail_cause_info->vendor_cause);
+      removeLastChar;
+      closeResponse;
+    } else {
+      RLOGE("responseFailCause: invalid response length %d expected an int or "
+            "RIL_LastCallFailCauseInfo", (int)responselen);
+      return RIL_ERRNO_INVALID_RESPONSE;
+    }
+
+    return 0;
+}
+
 /** response is a char **, pointing to an array of char *'s
     The parcel will begin with the version */
 static int responseStringsWithVersion(int version, Parcel &p, void *response, size_t responselen) {
diff --git a/libril/ril_commands.h b/libril/ril_commands.h
index eb90426..163aa46 100644
--- a/libril/ril_commands.h
+++ b/libril/ril_commands.h
@@ -32,7 +32,7 @@
     {RIL_REQUEST_SWITCH_WAITING_OR_HOLDING_AND_ACTIVE, dispatchVoid, responseVoid},
     {RIL_REQUEST_CONFERENCE, dispatchVoid, responseVoid},
     {RIL_REQUEST_UDUB, dispatchVoid, responseVoid},
-    {RIL_REQUEST_LAST_CALL_FAIL_CAUSE, dispatchVoid, responseInts},
+    {RIL_REQUEST_LAST_CALL_FAIL_CAUSE, dispatchVoid, responseFailCause},
     {RIL_REQUEST_SIGNAL_STRENGTH, dispatchVoid, responseRilSignalStrength},
     {RIL_REQUEST_VOICE_REGISTRATION_STATE, dispatchVoid, responseStrings},
     {RIL_REQUEST_DATA_REGISTRATION_STATE, dispatchVoid, responseStrings},