displayconfig: Add dummy display config API

Dummy display config API is added to check the backward
compatibility of IDisplayConfig2.0  with vendor freeze.

CRs-Fixed: 2855291
Change-Id: I4f3ddd5c1a9bb660ab252b9024650a9bd63a4ccf

services/config/config_defs.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2020 The Linux Foundation. All rights reserved.
+* Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -32,6 +32,8 @@
 
 #include <vector>
 #include <string>
+#include <errno.h>
+#include <cutils/native_handle.h>
 
 // #defines specifying the API level supported
 // Client can use these API level #ifdefs in their implementation to call the
@@ -322,6 +324,7 @@ class ConfigInterface {
                                       bool* /* supported */) DEFAULT_RET
   virtual int GetDisplayType(uint64_t /* physical_disp_id */,
                              DisplayType* /* disp_type */) DEFAULT_RET
+  virtual int DummyDisplayConfigAPI() DEFAULT_RET
 
   // deprecated APIs
   virtual int GetDebugProperty(const std::string /* prop_name */,

services/config/src/client_impl.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2020 The Linux Foundation. All rights reserved.
+* Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -934,6 +934,18 @@ int ClientImpl::IsRCSupported(uint32_t disp_id, bool *supported) {
   return error;
 }
 
+int ClientImpl::DummyDisplayConfigAPI() {
+  int error = 0;
+  auto hidl_cb = [&error] (int32_t err, ByteStream params, HandleStream handles) {
+    error = err;
+  };
+  display_config_->perform(client_handle_, kDummyOpcode, {}, {}, hidl_cb);
+  if (error) {
+    return -EINVAL;
+  }
+  return error;
+}
+
 int ClientImpl::IsSupportedConfigSwitch(uint32_t disp_id, uint32_t config, bool *supported) {
   struct SupportedModesParams input = {disp_id, config};
   ByteStream input_params;

services/config/src/client_impl.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2020 The Linux Foundation. All rights reserved.
+* Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -126,6 +126,7 @@ class ClientImpl : public ClientInterface {
   virtual int ControlIdleStatusCallback(bool enable);
   virtual int IsSupportedConfigSwitch(uint32_t disp_id, uint32_t config, bool *supported);
   virtual int GetDisplayType(uint64_t physical_disp_id, DisplayType *disp_type);
+  virtual int DummyDisplayConfigAPI();
 
  private:
   android::sp<IDisplayConfig> display_config_ = nullptr;

services/config/src/device_impl.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2020 The Linux Foundation. All rights reserved.
+* Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -1019,6 +1019,9 @@ Return<void> DeviceImpl::perform(uint64_t client_handle, uint32_t op_code,
     case kGetDisplayType:
       client->ParseGetDisplayType(input_params, _hidl_cb);
       break;
+    case kDummyOpcode:
+      _hidl_cb(-EINVAL, {}, {});
+      break;
     default:
       _hidl_cb(-EINVAL, {}, {});
       break;

services/config/src/opcode_types.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2020 The Linux Foundation. All rights reserved.
+* Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -82,6 +82,7 @@ enum OpCode {
   kControlIdleStatusCallback = 46,
   kIsSupportedConfigSwitch = 47,
   kGetDisplayType = 48,
+  kDummyOpcode = 49,
 
   kDestroy = 0xFFFF, // Destroy sequence execution
 };