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 DEVICE_HID_DEVICE_MONITOR_LINUX_H_ 6 #define DEVICE_HID_DEVICE_MONITOR_LINUX_H_ 7 8 #include <string> 9 10 #include "base/compiler_specific.h" 11 #include "base/macros.h" 12 #include "base/memory/scoped_ptr.h" 13 #include "base/message_loop/message_loop.h" 14 #include "base/message_loop/message_pump_libevent.h" 15 #include "base/observer_list.h" 16 #include "base/threading/thread_checker.h" 17 #include "device/udev_linux/udev.h" 18 19 struct udev_device; 20 21 namespace device { 22 23 // This class listends for notifications from libudev about 24 // connected/disconnected devices. This class is *NOT* thread-safe and 25 // all methods must be accessed from the FILE thread. 26 class DeviceMonitorLinux : public base::MessageLoop::DestructionObserver, 27 public base::MessagePumpLibevent::Watcher { 28 public: 29 typedef base::Callback<void(udev_device* device)> EnumerateCallback; 30 31 class Observer { 32 public: ~Observer()33 virtual ~Observer() {} 34 virtual void OnDeviceAdded(udev_device* device) = 0; 35 virtual void OnDeviceRemoved(udev_device* device) = 0; 36 }; 37 38 DeviceMonitorLinux(); 39 40 static DeviceMonitorLinux* GetInstance(); 41 static bool HasInstance(); 42 43 void AddObserver(Observer* observer); 44 void RemoveObserver(Observer* observer); 45 46 ScopedUdevDevicePtr GetDeviceFromPath(const std::string& path); 47 void Enumerate(const EnumerateCallback& callback); 48 49 // Implements base::MessageLoop::DestructionObserver 50 virtual void WillDestroyCurrentMessageLoop() OVERRIDE; 51 52 // Implements base::MessagePumpLibevent::Watcher 53 virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE; 54 virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE; 55 56 private: 57 friend struct base::DefaultDeleter<DeviceMonitorLinux>; 58 59 virtual ~DeviceMonitorLinux(); 60 61 ScopedUdevPtr udev_; 62 ScopedUdevMonitorPtr monitor_; 63 int monitor_fd_; 64 base::MessagePumpLibevent::FileDescriptorWatcher monitor_watcher_; 65 66 ObserverList<Observer> observers_; 67 68 base::ThreadChecker thread_checker_; 69 70 DISALLOW_COPY_AND_ASSIGN(DeviceMonitorLinux); 71 }; 72 73 } // namespace device 74 75 #endif // DEVICE_HID_DEVICE_MONITOR_LINUX_H_ 76