Enable LnbCallback in hidl/aidl default tuner implementation

Bug: 210960436
Test: cts.TunerTest#testLnbAddAndRemoveSharee
Change-Id: I11443144dcd1979afe9b077c446faaa293ccb61c
diff --git a/tv/tuner/1.0/default/Lnb.cpp b/tv/tuner/1.0/default/Lnb.cpp
index 6025339..c770e91 100644
--- a/tv/tuner/1.0/default/Lnb.cpp
+++ b/tv/tuner/1.0/default/Lnb.cpp
@@ -33,9 +33,10 @@
 
 Lnb::~Lnb() {}
 
-Return<Result> Lnb::setCallback(const sp<ILnbCallback>& /* callback */) {
+Return<Result> Lnb::setCallback(const sp<ILnbCallback>& callback) {
     ALOGV("%s", __FUNCTION__);
 
+    mCallback = callback;
     return Result::SUCCESS;
 }
 
@@ -57,9 +58,16 @@
     return Result::SUCCESS;
 }
 
-Return<Result> Lnb::sendDiseqcMessage(const hidl_vec<uint8_t>& /* diseqcMessage */) {
+Return<Result> Lnb::sendDiseqcMessage(const hidl_vec<uint8_t>& diseqcMessage) {
     ALOGV("%s", __FUNCTION__);
 
+    if (mCallback != nullptr) {
+        // The correct implementation should be to return the response from the
+        // device via onDiseqcMessage(). The below implementation is only to enable
+        // testing for LnbCallbacks.
+        ALOGV("[hidl] %s - this is for test purpose only, and must be replaced!", __FUNCTION__);
+        mCallback->onDiseqcMessage(diseqcMessage);
+    }
     return Result::SUCCESS;
 }