// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module device.serial;

import "data_stream.mojom";

struct DeviceInfo {
  string path;
  uint16 vendor_id;
  bool has_vendor_id = false;
  uint16 product_id;
  bool has_product_id = false;
  string? display_name;
};

enum SendError {
  NONE,
  DISCONNECTED,
  PENDING,
  TIMEOUT,
  SYSTEM_ERROR,
};

enum ReceiveError {
  NONE,
  DISCONNECTED,
  TIMEOUT,
  DEVICE_LOST,
  SYSTEM_ERROR,
};

enum DataBits {
  NONE,
  SEVEN,
  EIGHT,
};

enum ParityBit {
  NONE,
  NO,
  ODD,
  EVEN,
};

enum StopBits {
  NONE,
  ONE,
  TWO,
};

struct ConnectionOptions {
  uint32 bitrate = 0;
  DataBits data_bits = NONE;
  ParityBit parity_bit = NONE;
  StopBits stop_bits = NONE;
  bool cts_flow_control;
  bool has_cts_flow_control = false;
};

struct ConnectionInfo {
  uint32 bitrate = 0;
  DataBits data_bits = NONE;
  ParityBit parity_bit = NONE;
  StopBits stop_bits = NONE;
  bool cts_flow_control;
};

struct HostControlSignals {
  bool dtr;
  bool has_dtr = false;
  bool rts;
  bool has_rts = false;
};

struct DeviceControlSignals {
  bool dcd;
  bool cts;
  bool ri;
  bool dsr;
};

interface SerialService {
  GetDevices() => (array<DeviceInfo> devices);

  // Creates a |Connection| to |path| with options specified by |options|,
  // returning it via |connection|. Sending and receiving data over this
  // connection is handled by |sink| and |source|, respectively. This will fail
  // and |connection| will not be usable if |path| does not specify a valid
  // serial device or there is an error connecting to or configuring the
  // connection.
  Connect(string path,
          ConnectionOptions? options,
          Connection& connection,
          DataSink& sink,
          DataSource& source);
};

interface Connection {
  GetInfo() => (ConnectionInfo? info);
  SetOptions(ConnectionOptions options) => (bool success);
  SetControlSignals(HostControlSignals signals) => (bool success);
  GetControlSignals() => (DeviceControlSignals? signals);
  Flush() => (bool success);
};