1// Copyright (c) 2012 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 CHROME_BROWSER_USB_USB_SERVICE_H_ 6#define CHROME_BROWSER_USB_USB_SERVICE_H_ 7 8#include <map> 9#include <utility> 10#include <vector> 11 12#include "base/basictypes.h" 13#include "base/callback.h" 14#include "base/memory/ref_counted.h" 15#include "base/memory/singleton.h" 16 17namespace base { 18 19template <class T> class DeleteHelper; 20 21} // namespace base 22 23struct InitUsbContextTraits; 24template <typename T> struct DefaultSingletonTraits; 25 26typedef struct libusb_device* PlatformUsbDevice; 27typedef struct libusb_context* PlatformUsbContext; 28 29class UsbContext; 30class UsbDevice; 31 32// The USB service handles creating and managing an event handler thread that is 33// used to manage and dispatch USB events. It is also responsible for device 34// discovery on the system, which allows it to re-use device handles to prevent 35// competition for the same USB device. 36class UsbService { 37 public: 38 typedef scoped_ptr<std::vector<scoped_refptr<UsbDevice> > > 39 ScopedDeviceVector; 40 41 // Must be called on FILE thread. 42 // Returns NULL when failed to initialized. 43 static UsbService* GetInstance(); 44 45 scoped_refptr<UsbDevice> GetDeviceById(uint32 unique_id); 46 47 // Get all of the devices attached to the system, inserting them into 48 // |devices|. Clears |devices| before use. The result will be sorted by id 49 // in increasing order. Must be called on FILE thread. 50 void GetDevices(std::vector<scoped_refptr<UsbDevice> >* devices); 51 52 private: 53 friend struct InitUsbContextTraits; 54 friend struct DefaultSingletonTraits<UsbService>; 55 friend class base::DeleteHelper<UsbService>; 56 57 explicit UsbService(PlatformUsbContext context); 58 virtual ~UsbService(); 59 60 // Return true if |device|'s vendor and product identifiers match |vendor_id| 61 // and |product_id|. 62 static bool DeviceMatches(scoped_refptr<UsbDevice> device, 63 const uint16 vendor_id, 64 const uint16 product_id); 65 66 // Enumerate USB devices from OS and Update devices_ map. 67 void RefreshDevices(); 68 69 scoped_refptr<UsbContext> context_; 70 71 // TODO(ikarienator): Figure out a better solution. 72 uint32 next_unique_id_; 73 74 // The map from PlatformUsbDevices to UsbDevices. 75 typedef std::map<PlatformUsbDevice, scoped_refptr<UsbDevice> > DeviceMap; 76 DeviceMap devices_; 77 78 DISALLOW_COPY_AND_ASSIGN(UsbService); 79}; 80 81#endif // CHROME_BROWSER_USB_USB_SERVICE_H_ 82