src/example_driver/example_driver.cc

// Copyright 2021 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "example_driver.h"

#include <fidl/fuchsia.driver.compat/cpp/wire.h>
#include <lib/driver2/service_client.h>

#include "greeter.h"

namespace example_driver {

zx::result<> ExampleDriver::Start() {
  // Connect to the parent device node.
  auto parent =
      driver::Connect<fuchsia_driver_compat::Service::Device>(*context().incoming(), "default");
  if (parent.status_value() != ZX_OK) {
    FDF_SLOG(ERROR, "Failed to connect to parent", KV("status", parent.status_string()));
    return parent.take_error();
  }

  auto client = fidl::WireSyncClient(std::move(parent.value()));
  auto topological_path = client->GetTopologicalPath();
  if (!topological_path.ok()) {
    FDF_SLOG(ERROR, "Failed to get topological path",
             KV("error_desc", topological_path.FormatDescription().c_str()));
    return zx::error(ZX_ERR_INTERNAL);
  }

  FDF_SLOG(INFO, example_driver::greeting(name()).c_str());
  FDF_SLOG(INFO, example_driver::greeting(topological_path.value().path.get()).c_str());
  return zx::ok();
}

}  // namespace example_driver

FUCHSIA_DRIVER_RECORD_CPP_V2(driver::Record<example_driver::ExampleDriver>);