Add adapters for HIDL interfaces.

An adapter for a HIDL interface takes an x.(y+1) interface
and registers it as an x.y interface.

This adds new autogenerated test libraries to HIDL which
can be used to run tests.

Test: can switch out implementations
~/android/master$ lshal | grep hidl.allocator
Y android.hidl.allocator@1.0::IAllocator/ashmem                               0/1        652    471
~/android/master$ lshal | grep hidl.allocator
Y android.hidl.allocator@1.0::IAllocator/ashmem                               0/1        7635   471
~/android/master$ lshal | grep hidl.allocator
Y android.hidl.allocator@1.0::IAllocator/ashmem                               0/1        652    471
Test: build all adapters in hardware/interfaces
Test: adapt @1.1::IPower to @1.0::IPower
Test: NFC works even after having an adaption layer over it (@1.0 -> @1.0 :/)

Bug: 37518178
Change-Id: Ia009d59352963321f16e085f034f70c462ccceeb

2 files changed, 18 insertions, 0 deletions

diff --git a/utils/FQName.cpp b/utils/FQName.cpp
index 630fff47..bb62244f 100644
--- a/utils/FQName.cpp
+++ b/utils/FQName.cpp
@@ -318,6 +318,10 @@ std::string FQName::getInterfaceBaseName() const {
     return getInterfaceName().substr(1);
 }
 
+std::string FQName::getInterfaceAdapterName() const {
+    return "A" + getInterfaceBaseName();
+}
+
 std::string FQName::getInterfaceHwName() const {
     return "IHw" + getInterfaceBaseName();
 }
@@ -338,6 +342,10 @@ FQName FQName::getInterfaceProxyFqName() const {
     return FQName(package(), version(), getInterfaceProxyName());
 }
 
+FQName FQName::getInterfaceAdapterFqName() const {
+    return FQName(package(), version(), getInterfaceAdapterName());
+}
+
 FQName FQName::getInterfaceStubFqName() const {
     return FQName(package(), version(), getInterfaceStubName());
 }
diff --git a/utils/include/hidl-util/FQName.h b/utils/include/hidl-util/FQName.h
index 3cdc7a9b..ae852388 100644
--- a/utils/include/hidl-util/FQName.h
+++ b/utils/include/hidl-util/FQName.h
@@ -110,6 +110,11 @@ struct FQName {
 
     // Must be called on an interface
     // android.hardware.foo@1.0::IBar
+    // -> ABar
+    std::string getInterfaceAdapterName() const;
+
+    // Must be called on an interface
+    // android.hardware.foo@1.0::IBar
     // -> IBar
     std::string getInterfaceName() const;
 
@@ -140,6 +145,11 @@ struct FQName {
 
     // Must be called on an interface
     // android.hardware.foo@1.0::IBar
+    // -> android.hardware.foo@1.0::ABar
+    FQName getInterfaceAdapterFqName() const;
+
+    // Must be called on an interface
+    // android.hardware.foo@1.0::IBar
     // -> android.hardware.foo@1.0::BnBar
     FQName getInterfaceStubFqName() const;