1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
// 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.
#include "device/usb/usb_service.h"
#include <map>
#include <set>
#include "base/lazy_instance.h"
#include "base/message_loop/message_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/stl_util.h"
#include "device/usb/usb_context.h"
#include "device/usb/usb_device_impl.h"
#include "device/usb/usb_error.h"
#include "third_party/libusb/src/libusb/libusb.h"
namespace device {
namespace {
base::LazyInstance<scoped_ptr<UsbService> >::Leaky g_usb_service_instance =
LAZY_INSTANCE_INITIALIZER;
} // namespace
typedef struct libusb_device* PlatformUsbDevice;
typedef struct libusb_context* PlatformUsbContext;
class UsbServiceImpl : public UsbService,
private base::MessageLoop::DestructionObserver {
public:
explicit UsbServiceImpl(
PlatformUsbContext context,
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
virtual ~UsbServiceImpl();
private:
// device::UsbService implementation
virtual scoped_refptr<UsbDevice> GetDeviceById(uint32 unique_id) OVERRIDE;
virtual void GetDevices(
std::vector<scoped_refptr<UsbDevice> >* devices) OVERRIDE;
// base::MessageLoop::DestructionObserver implementation.
virtual void WillDestroyCurrentMessageLoop() OVERRIDE;
// Enumerate USB devices from OS and Update devices_ map.
void RefreshDevices();
scoped_refptr<UsbContext> context_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
// TODO(ikarienator): Figure out a better solution.
uint32 next_unique_id_;
// The map from PlatformUsbDevices to UsbDevices.
typedef std::map<PlatformUsbDevice, scoped_refptr<UsbDeviceImpl> > DeviceMap;
DeviceMap devices_;
DISALLOW_COPY_AND_ASSIGN(UsbServiceImpl);
};
scoped_refptr<UsbDevice> UsbServiceImpl::GetDeviceById(uint32 unique_id) {
DCHECK(CalledOnValidThread());
RefreshDevices();
for (DeviceMap::iterator it = devices_.begin(); it != devices_.end(); ++it) {
if (it->second->unique_id() == unique_id)
return it->second;
}
return NULL;
}
void UsbServiceImpl::GetDevices(
std::vector<scoped_refptr<UsbDevice> >* devices) {
DCHECK(CalledOnValidThread());
STLClearObject(devices);
RefreshDevices();
for (DeviceMap::iterator it = devices_.begin(); it != devices_.end(); ++it) {
devices->push_back(it->second);
}
}
void UsbServiceImpl::WillDestroyCurrentMessageLoop() {
DCHECK(CalledOnValidThread());
g_usb_service_instance.Get().reset(NULL);
}
UsbServiceImpl::UsbServiceImpl(
PlatformUsbContext context,
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner)
: context_(new UsbContext(context)),
ui_task_runner_(ui_task_runner),
next_unique_id_(0) {
base::MessageLoop::current()->AddDestructionObserver(this);
}
UsbServiceImpl::~UsbServiceImpl() {
base::MessageLoop::current()->RemoveDestructionObserver(this);
for (DeviceMap::iterator it = devices_.begin(); it != devices_.end(); ++it) {
it->second->OnDisconnect();
}
}
void UsbServiceImpl::RefreshDevices() {
DCHECK(CalledOnValidThread());
libusb_device** platform_devices = NULL;
const ssize_t device_count =
libusb_get_device_list(context_->context(), &platform_devices);
if (device_count < 0) {
VLOG(1) << "Failed to get device list: "
<< ConvertPlatformUsbErrorToString(device_count);
}
std::set<UsbDevice*> connected_devices;
std::vector<PlatformUsbDevice> disconnected_devices;
// Populates new devices.
for (ssize_t i = 0; i < device_count; ++i) {
if (!ContainsKey(devices_, platform_devices[i])) {
libusb_device_descriptor descriptor;
const int rv =
libusb_get_device_descriptor(platform_devices[i], &descriptor);
// This test is needed. A valid vendor/produce pair is required.
if (rv != LIBUSB_SUCCESS) {
VLOG(1) << "Failed to get device descriptor: "
<< ConvertPlatformUsbErrorToString(rv);
continue;
}
UsbDeviceImpl* new_device = new UsbDeviceImpl(context_,
ui_task_runner_,
platform_devices[i],
descriptor.idVendor,
descriptor.idProduct,
++next_unique_id_);
devices_[platform_devices[i]] = new_device;
connected_devices.insert(new_device);
} else {
connected_devices.insert(devices_[platform_devices[i]].get());
}
}
// Find disconnected devices.
for (DeviceMap::iterator it = devices_.begin(); it != devices_.end(); ++it) {
if (!ContainsKey(connected_devices, it->second.get())) {
disconnected_devices.push_back(it->first);
}
}
// Remove disconnected devices from devices_.
for (size_t i = 0; i < disconnected_devices.size(); ++i) {
// UsbDevice will be destroyed after this. The corresponding
// PlatformUsbDevice will be unref'ed during this process.
devices_.erase(disconnected_devices[i]);
}
libusb_free_device_list(platform_devices, true);
}
// static
UsbService* UsbService::GetInstance(
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
UsbService* instance = g_usb_service_instance.Get().get();
if (!instance) {
PlatformUsbContext context = NULL;
const int rv = libusb_init(&context);
if (rv != LIBUSB_SUCCESS) {
VLOG(1) << "Failed to initialize libusb: "
<< ConvertPlatformUsbErrorToString(rv);
return NULL;
}
if (!context)
return NULL;
instance = new UsbServiceImpl(context, ui_task_runner);
g_usb_service_instance.Get().reset(instance);
}
return instance;
}
// static
void UsbService::SetInstanceForTest(UsbService* instance) {
g_usb_service_instance.Get().reset(instance);
}
} // namespace device
|
