GP-654: Add SIM card-based carrier detection

This commit adds implementation of the SIM-based carrier detection.

The goal for this implementation is to replace various places in the firmware
that previously relied on the ICCID-based carrier detection, provide some layer
of abstraction and forward compatibility for such places.

It is particularly useful for fwSwitch radios with AUTO firmware selection capability.

1 files changed, 43 insertions, 0 deletions

diff --git a/src/MTS_IO_CellularRadio.cpp b/src/MTS_IO_CellularRadio.cpp
index 648894f..bef15e9 100644
--- a/src/MTS_IO_CellularRadio.cpp
+++ b/src/MTS_IO_CellularRadio.cpp
@@ -912,6 +912,49 @@ ICellularRadio::CODE CellularRadio::unlockSimCard(const Json::Value& jArgs) {
     return SUCCESS;
 }
 
+ICellularRadio::CODE CellularRadio::getMtsSimCarrierCode(std::string& sCarrierCode) {
+    std::string sIccid;
+    CODE rc;
+
+    printTrace("%s| Get MTS carrier code from the SIM card installed", m_sName.c_str());
+
+    rc = getIccid(sIccid);
+    if (rc != SUCCESS) {
+        printError("%s| Unable to determine SIM carrier: Failed to fetch SIM identifier", m_sName.c_str());
+        return rc;
+    }
+
+    printTrace("%s| Fetched ICCID: [%s]", m_sName.c_str(), sIccid.c_str());
+
+    rc = getMtsSimCarrierCode(sIccid, sCarrierCode);
+    if (rc != SUCCESS) {
+        printError("%s| Unable to determine SIM carrier: Unable to extract carrier from the SIM identifier", m_sName.c_str());
+        return rc;
+    }
+
+    printTrace("%s| Detected MTS carrier code: [%s]", m_sName.c_str(), sCarrierCode.c_str());
+    return rc;
+}
+
+ICellularRadio::CODE CellularRadio::getMtsSimCarrierCode(const std::string& sIccid, std::string& sCarrierCode) {
+    const char* ICCID_PREFIX_VZW = "891480";
+    const char* ICCID_PREFIX_ATT = "8901410";
+
+    if (sIccid.find(ICCID_PREFIX_VZW) == 0) {
+        printTrace("%s| Verizon SIM detected", m_sName.c_str());
+        sCarrierCode = VALUE_MTS_CARRIER_CODE_VERIZON;
+    } else if (sIccid.find(ICCID_PREFIX_ATT) == 0) {
+        printTrace("%s| AT&T SIM detected", m_sName.c_str());
+        sCarrierCode = VALUE_MTS_CARRIER_CODE_ATT;
+    } else {
+        // All other carriers for which ICCID prefixes are not defined
+        printWarning("%s| Carrier is unknown for this SIM ID: [%s]", m_sName.c_str(), sIccid.c_str());
+        sCarrierCode = VALUE_UNKNOWN;
+    }
+
+    return SUCCESS;  // no error cases for now
+}
+
 ICellularRadio::CODE CellularRadio::validateMsl(const Json::Value&) {
     printTrace("%s| Validate MSL", m_sName.c_str());