src/acpi_multiply/controller/acpi_controller.cc

// Copyright 2022 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 "acpi_controller.h"

#include <bind/fuchsia/acpi/cpp/bind.h>
#include <bind/fuchsia/hardware/acpi/cpp/bind.h>

namespace acpi_multiply {

zx::result<> AcpiMultiplyController::Start() {
  node_.Bind(std::move(node()));

  auto server_result = InitializeServer();
  if (server_result.is_error()) {
    FDF_LOG(ERROR, "Failed to initialize ACPI Server: %s",
            zx_status_get_string(server_result.error_value()));
    return server_result.take_error();
  }

  // Serve the fuchsia.hardware.acpi/Device protocol to clients through the
  // fuchsia.hardware.acpi/Service wrapper.
  driver::ServiceInstanceHandler handler;
  fuchsia_hardware_acpi::Service::Handler service(&handler);
  auto result =
      service.add_device([this](fidl::ServerEnd<fuchsia_hardware_acpi::Device> request) -> void {
        AcpiDeviceServer::BindDeviceClient(server_, dispatcher(), std::move(request));
      });
  if (result.is_error()) {
    return result.take_error();
  }

  result = context().outgoing()->AddService<fuchsia_hardware_acpi::Service>(std::move(handler));
  if (result.is_error()) {
    FDF_SLOG(ERROR, "Failed to add service", KV("status", result.status_string()));
    return result.take_error();
  }

  result = AddChild();
  if (result.is_error()) {
    return result.take_error();
  }

  return zx::ok();
}

zx::result<> AcpiMultiplyController::InitializeServer() {
  // Allocate an MMIO buffer representing the ACPI multiply device
  zx::vmo vmo;
  zx_status_t raw_status = zx::vmo::create(zx_system_get_page_size(), 0, &vmo);
  if (raw_status != ZX_OK) {
    FDF_LOG(ERROR, "Failed to create vmo: %s.", zx_status_get_string(raw_status));
    return zx::error(raw_status);
  }

  auto buffer = fdf::MmioBuffer::Create(0, zx_system_get_page_size(), std::move(vmo),
                                        ZX_CACHE_POLICY_UNCACHED_DEVICE);
  if (buffer.is_error()) {
    FDF_LOG(ERROR, "Failed to create mmio buffer: %s.", zx_status_get_string(buffer.error_value()));
    return buffer.take_error();
  }

  // Create an IRQ resource for the ACPI multiply device
  zx::interrupt irq;
  raw_status = zx::interrupt::create(zx::resource(), 0, ZX_INTERRUPT_VIRTUAL, &irq);
  if (raw_status != ZX_OK) {
    FDF_LOG(ERROR, "Failed to create interrupt: %s.", zx_status_get_string(raw_status));
    return zx::error(raw_status);
  }

  server_ = std::make_shared<AcpiDeviceServer>(std::move(irq), std::move(buffer.value()), &logger(),
                                               dispatcher());
  return zx::ok();
}

zx::result<> AcpiMultiplyController::AddChild() {
  fidl::Arena arena;
  // Offer fuchsia.hardware.acpi.Service to the driver that binds to the node.
  auto offers = fidl::VectorView<fuchsia_component_decl::wire::Offer>(arena, 1);
  offers[0] = driver::MakeOffer<fuchsia_hardware_acpi::Service>(arena, "default");

  // Set the properties of the node that a driver binds to.
  auto properties = fidl::VectorView<fuchsia_driver_framework::wire::NodeProperty>(arena, 2);
  properties[0] = driver::MakeEnumProperty(arena, bind_fuchsia_hardware_acpi::DEVICE,
                                           bind_fuchsia_hardware_acpi::DEVICE_ZIRCONTRANSPORT);
  properties[1] = driver::MakeProperty(arena, bind_fuchsia_acpi::HID, "FDFS0001");

  auto args = fuchsia_driver_framework::wire::NodeAddArgs::Builder(arena)
                  .name(arena, "acpi-child")
                  .offers(offers)
                  .properties(properties)
                  .Build();

  // Create endpoints of the `NodeController` for the node.
  auto endpoints = fidl::CreateEndpoints<fuchsia_driver_framework::NodeController>();
  if (endpoints.is_error()) {
    FDF_SLOG(ERROR, "Failed to create endpoint", KV("status", endpoints.status_string()));
    return endpoints.take_error();
  }

  auto result = node_->AddChild(args, std::move(endpoints->server), {});
  if (!result.ok()) {
    FDF_SLOG(ERROR, "Failed to add child", KV("error_desc", result.FormatDescription().c_str()));
    return zx::error(result.status());
  }

  if (result->is_error()) {
    FDF_SLOG(ERROR, "Failed to add child",
             KV("status", std::to_string(static_cast<uint32_t>(result->error_value())).c_str()));
    return zx::error(ZX_ERR_INTERNAL);
  }

  controller_.Bind(std::move(endpoints->client));

  return zx::ok();
}

}  // namespace acpi_multiply

FUCHSIA_DRIVER_RECORD_CPP_V2(driver::Record<acpi_multiply::AcpiMultiplyController>);