1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_
6#define UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_
7
8#include <libevdev/libevdev.h>
9
10#include "base/files/file_path.h"
11#include "base/message_loop/message_loop.h"
12#include "ui/events/ozone/evdev/event_converter_evdev.h"
13
14namespace ui {
15
16// Basic wrapper for libevdev-cros.
17//
18// This drives libevdev-cros from a file descriptor and calls delegate
19// with the updated event state from libevdev-cros.
20//
21// The library doesn't support all devices currently. In particular there
22// is no support for keyboard events.
23class EventReaderLibevdevCros : public base::MessagePumpLibevent::Watcher,
24                                public EventConverterEvdev {
25 public:
26  class Delegate {
27   public:
28    virtual ~Delegate();
29
30    // Notifier for open. This is called with the initial event state.
31    virtual void OnLibEvdevCrosOpen(Evdev* evdev, EventStateRec* evstate) = 0;
32
33    // Notifier for event. This is called with the updated event state.
34    virtual void OnLibEvdevCrosEvent(Evdev* evdev,
35                                     EventStateRec* state,
36                                     const timeval& time) = 0;
37  };
38
39  EventReaderLibevdevCros(int fd,
40                          const base::FilePath& path,
41                          scoped_ptr<Delegate> delegate);
42  ~EventReaderLibevdevCros();
43
44  // Overridden from ui::EventDeviceEvdev.
45  void Start() OVERRIDE;
46  void Stop() OVERRIDE;
47
48  // Overidden from MessagePumpLibevent::Watcher.
49  virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
50  virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
51
52 private:
53  static void OnSynReport(void* data,
54                          EventStateRec* evstate,
55                          struct timeval* tv);
56  static void OnLogMessage(void*, int level, const char*, ...);
57
58  // Libevdev state.
59  Evdev evdev_;
60
61  // Event state.
62  EventStateRec evstate_;
63
64  // Path to input device.
65  base::FilePath path_;
66
67  // Delegate for event processing.
68  scoped_ptr<Delegate> delegate_;
69
70  // Controller for watching the input fd.
71  base::MessagePumpLibevent::FileDescriptorWatcher controller_;
72
73  DISALLOW_COPY_AND_ASSIGN(EventReaderLibevdevCros);
74};
75
76}  // namspace ui
77
78#endif  // UI_EVENTS_OZONE_EVDEV_LIBGESTURES_GLUE_EVENT_READER_LIBEVDEV_CROS_H_
79