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#include "device/hid/hid_service.h"
6
7#include "base/lazy_instance.h"
8#include "base/logging.h"
9#include "base/memory/scoped_vector.h"
10#include "base/message_loop/message_loop.h"
11#include "base/stl_util.h"
12
13#if defined(OS_LINUX) && defined(USE_UDEV)
14#include "device/hid/hid_service_linux.h"
15#elif defined(OS_MACOSX)
16#include "device/hid/hid_service_mac.h"
17#else
18#include "device/hid/hid_service_win.h"
19#endif
20
21namespace device {
22
23namespace {
24
25HidService* g_service = NULL;
26
27}  // namespace
28
29class HidService::Destroyer : public base::MessageLoop::DestructionObserver {
30 public:
31  explicit Destroyer(HidService* hid_service)
32      : hid_service_(hid_service) {}
33  virtual ~Destroyer() {}
34
35 private:
36  // base::MessageLoop::DestructionObserver implementation.
37  virtual void WillDestroyCurrentMessageLoop() OVERRIDE {
38    base::MessageLoop::current()->RemoveDestructionObserver(this);
39    delete hid_service_;
40    delete this;
41    g_service = NULL;
42  }
43
44  HidService* hid_service_;
45};
46
47HidService* HidService::GetInstance(
48    scoped_refptr<base::SingleThreadTaskRunner> file_task_runner,
49    scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
50  if (g_service == NULL) {
51#if defined(OS_LINUX) && defined(USE_UDEV)
52    g_service = new HidServiceLinux(ui_task_runner);
53#elif defined(OS_MACOSX)
54    g_service = new HidServiceMac(file_task_runner);
55#elif defined(OS_WIN)
56    g_service = new HidServiceWin();
57#endif
58    if (g_service != NULL) {
59      Destroyer* destroyer = new Destroyer(g_service);
60      base::MessageLoop::current()->AddDestructionObserver(destroyer);
61    }
62  }
63  return g_service;
64}
65
66HidService::~HidService() {
67  DCHECK(thread_checker_.CalledOnValidThread());
68}
69
70void HidService::GetDevices(std::vector<HidDeviceInfo>* devices) {
71  DCHECK(thread_checker_.CalledOnValidThread());
72  STLClearObject(devices);
73  for (DeviceMap::iterator it = devices_.begin();
74      it != devices_.end();
75      ++it) {
76    devices->push_back(it->second);
77  }
78}
79
80// Fills in the device info struct of the given device_id.
81bool HidService::GetDeviceInfo(const HidDeviceId& device_id,
82                               HidDeviceInfo* info) const {
83  DeviceMap::const_iterator it = devices_.find(device_id);
84  if (it == devices_.end())
85    return false;
86  *info = it->second;
87  return true;
88}
89
90HidService::HidService() {
91  DCHECK(thread_checker_.CalledOnValidThread());
92}
93
94void HidService::AddDevice(const HidDeviceInfo& info) {
95  DCHECK(thread_checker_.CalledOnValidThread());
96  if (!ContainsKey(devices_, info.device_id)) {
97    devices_[info.device_id] = info;
98  }
99}
100
101void HidService::RemoveDevice(const HidDeviceId& device_id) {
102  DCHECK(thread_checker_.CalledOnValidThread());
103  DeviceMap::iterator it = devices_.find(device_id);
104  if (it != devices_.end())
105    devices_.erase(it);
106}
107
108}  // namespace device
109