1// Copyright 2013 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_EVENT_DEVICE_INFO_H_
6#define UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_
7
8#include <limits.h>
9#include <linux/input.h>
10
11#include "base/basictypes.h"
12
13#define EVDEV_LONG_BITS (CHAR_BIT * sizeof(long))
14#define EVDEV_BITS_TO_LONGS(x) (((x) + EVDEV_LONG_BITS - 1) / EVDEV_LONG_BITS)
15
16namespace ui {
17
18// Device information for Linux input devices
19//
20// This stores and queries information about input devices; in
21// particular it knows which events the device can generate.
22class EventDeviceInfo {
23 public:
24  EventDeviceInfo();
25  ~EventDeviceInfo();
26
27  // Initialize device information from an open device.
28  bool Initialize(int fd);
29
30  // Check events this device can generate.
31  bool HasEventType(unsigned int type) const;
32  bool HasKeyEvent(unsigned int code) const;
33  bool HasRelEvent(unsigned int code) const;
34  bool HasAbsEvent(unsigned int code) const;
35  bool HasMscEvent(unsigned int code) const;
36  bool HasSwEvent(unsigned int code) const;
37  bool HasLedEvent(unsigned int code) const;
38
39  // Check input device properties.
40  bool HasProp(unsigned int code) const;
41
42 private:
43  unsigned long ev_bits_[EVDEV_BITS_TO_LONGS(EV_CNT)];
44  unsigned long key_bits_[EVDEV_BITS_TO_LONGS(KEY_CNT)];
45  unsigned long rel_bits_[EVDEV_BITS_TO_LONGS(REL_CNT)];
46  unsigned long abs_bits_[EVDEV_BITS_TO_LONGS(ABS_CNT)];
47  unsigned long msc_bits_[EVDEV_BITS_TO_LONGS(MSC_CNT)];
48  unsigned long sw_bits_[EVDEV_BITS_TO_LONGS(SW_CNT)];
49  unsigned long led_bits_[EVDEV_BITS_TO_LONGS(LED_CNT)];
50  unsigned long prop_bits_[EVDEV_BITS_TO_LONGS(INPUT_PROP_CNT)];
51
52  DISALLOW_COPY_AND_ASSIGN(EventDeviceInfo);
53};
54
55}  // namspace ui
56
57#endif  // UI_EVENTS_OZONE_EVDEV_EVENT_DEVICE_INFO_H_
58