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| 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/device_monitor_linux.h" | |
| 6 | |
| 7 #include <memory> | |
| 8 | |
| 9 #include "base/lazy_instance.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/threading/thread_restrictions.h" | |
| 12 #include "device/udev_linux/udev.h" | |
| 13 | |
| 14 namespace device { | |
| 15 | |
| 16 namespace { | |
| 17 | |
| 18 const char kUdevName[] = "udev"; | |
| 19 const char kUdevActionAdd[] = "add"; | |
| 20 const char kUdevActionRemove[] = "remove"; | |
| 21 | |
| 22 // The instance will be reset when message loop destroys. | |
| 23 base::LazyInstance<std::unique_ptr<DeviceMonitorLinux>>::Leaky | |
| 24 g_device_monitor_linux_ptr = LAZY_INSTANCE_INITIALIZER; | |
| 25 | |
| 26 } // namespace | |
| 27 | |
| 28 DeviceMonitorLinux::DeviceMonitorLinux() : monitor_fd_(-1) { | |
| 29 base::ThreadRestrictions::AssertIOAllowed(); | |
| 30 base::MessageLoop::current()->AddDestructionObserver(this); | |
| 31 | |
| 32 udev_.reset(udev_new()); | |
| 33 if (!udev_) { | |
| 34 LOG(ERROR) << "Failed to create udev."; | |
| 35 return; | |
| 36 } | |
| 37 monitor_.reset(udev_monitor_new_from_netlink(udev_.get(), kUdevName)); | |
| 38 if (!monitor_) { | |
| 39 LOG(ERROR) << "Failed to create udev monitor."; | |
| 40 return; | |
| 41 } | |
| 42 | |
| 43 int ret = udev_monitor_enable_receiving(monitor_.get()); | |
| 44 if (ret != 0) { | |
| 45 LOG(ERROR) << "Failed to start udev monitoring."; | |
| 46 return; | |
| 47 } | |
| 48 | |
| 49 monitor_fd_ = udev_monitor_get_fd(monitor_.get()); | |
| 50 if (monitor_fd_ <= 0) { | |
| 51 LOG(ERROR) << "Failed to start udev monitoring."; | |
| 52 return; | |
| 53 } | |
| 54 | |
| 55 if (!base::MessageLoopForIO::current()->WatchFileDescriptor( | |
| 56 monitor_fd_, | |
| 57 true, | |
| 58 base::MessageLoopForIO::WATCH_READ, | |
| 59 &monitor_watcher_, | |
| 60 this)) { | |
| 61 return; | |
| 62 } | |
| 63 } | |
| 64 | |
| 65 // static | |
| 66 DeviceMonitorLinux* DeviceMonitorLinux::GetInstance() { | |
| 67 if (!HasInstance()) | |
| 68 g_device_monitor_linux_ptr.Get().reset(new DeviceMonitorLinux()); | |
| 69 return g_device_monitor_linux_ptr.Get().get(); | |
| 70 } | |
| 71 | |
| 72 // static | |
| 73 bool DeviceMonitorLinux::HasInstance() { | |
| 74 return g_device_monitor_linux_ptr.Get().get(); | |
| 75 } | |
| 76 | |
| 77 void DeviceMonitorLinux::AddObserver(Observer* observer) { | |
| 78 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 79 if (observer) | |
| 80 observers_.AddObserver(observer); | |
| 81 } | |
| 82 | |
| 83 void DeviceMonitorLinux::RemoveObserver(Observer* observer) { | |
| 84 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 85 if (observer) | |
| 86 observers_.RemoveObserver(observer); | |
| 87 } | |
| 88 | |
| 89 ScopedUdevDevicePtr DeviceMonitorLinux::GetDeviceFromPath( | |
| 90 const std::string& path) { | |
| 91 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 92 ScopedUdevDevicePtr device( | |
| 93 udev_device_new_from_syspath(udev_.get(), path.c_str())); | |
| 94 return device; | |
| 95 } | |
| 96 | |
| 97 void DeviceMonitorLinux::Enumerate(const EnumerateCallback& callback) { | |
| 98 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 99 ScopedUdevEnumeratePtr enumerate(udev_enumerate_new(udev_.get())); | |
| 100 | |
| 101 if (!enumerate) { | |
| 102 LOG(ERROR) << "Failed to enumerate devices."; | |
| 103 return; | |
| 104 } | |
| 105 | |
| 106 if (udev_enumerate_scan_devices(enumerate.get()) != 0) { | |
| 107 LOG(ERROR) << "Failed to enumerate devices."; | |
| 108 return; | |
| 109 } | |
| 110 | |
| 111 // This list is managed by |enumerate|. | |
| 112 udev_list_entry* devices = udev_enumerate_get_list_entry(enumerate.get()); | |
| 113 for (udev_list_entry* i = devices; i != NULL; | |
| 114 i = udev_list_entry_get_next(i)) { | |
| 115 ScopedUdevDevicePtr device( | |
| 116 udev_device_new_from_syspath(udev_.get(), udev_list_entry_get_name(i))); | |
| 117 if (device) | |
| 118 callback.Run(device.get()); | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 void DeviceMonitorLinux::WillDestroyCurrentMessageLoop() { | |
| 123 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 124 g_device_monitor_linux_ptr.Get().reset(NULL); | |
| 125 } | |
| 126 | |
| 127 void DeviceMonitorLinux::OnFileCanReadWithoutBlocking(int fd) { | |
| 128 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 129 DCHECK_EQ(monitor_fd_, fd); | |
| 130 | |
| 131 ScopedUdevDevicePtr device(udev_monitor_receive_device(monitor_.get())); | |
| 132 if (!device) | |
| 133 return; | |
| 134 | |
| 135 std::string action(udev_device_get_action(device.get())); | |
| 136 if (action == kUdevActionAdd) | |
| 137 FOR_EACH_OBSERVER(Observer, observers_, OnDeviceAdded(device.get())); | |
| 138 else if (action == kUdevActionRemove) | |
| 139 FOR_EACH_OBSERVER(Observer, observers_, OnDeviceRemoved(device.get())); | |
| 140 } | |
| 141 | |
| 142 void DeviceMonitorLinux::OnFileCanWriteWithoutBlocking(int fd) {} | |
| 143 | |
| 144 DeviceMonitorLinux::~DeviceMonitorLinux() { | |
| 145 DCHECK(thread_checker_.CalledOnValidThread()); | |
| 146 base::MessageLoop::current()->RemoveDestructionObserver(this); | |
| 147 monitor_watcher_.StopWatchingFileDescriptor(); | |
| 148 close(monitor_fd_); | |
| 149 } | |
| 150 | |
| 151 } // namespace device | |
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Chromium Code Reviews
Issue 2014933002:
Move DeviceMonitorLinux to //device/core. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master