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/memory/singleton.h" 14 #include "chrome/browser/usb/usb_device.h" 15 16 namespace base { 17 18 template <class T> class DeleteHelper; 19 20 } // namespace base 21 22 template <typename T> struct DefaultSingletonTraits; 23 class UsbContext; 24 25 // The USB service handles creating and managing an event handler thread that is 26 // used to manage and dispatch USB events. It is also responsbile for device 27 // discovery on the system, which allows it to re-use device handles to prevent 28 // competition for the same USB device. 29 class UsbService { 30 public: 31 typedef scoped_ptr<std::vector<scoped_refptr<UsbDevice> > > 32 ScopedDeviceVector; 33 34 // Must be called on FILE thread. 35 static UsbService* GetInstance(); 36 37 // Find all of the devices attached to the system that are identified by 38 // |vendor_id| and |product_id|, inserting them into |devices|. Clears 39 // |devices| before use. Calls |callback| once |devices| is populated. 40 // The result will be sorted by id in increasing order. Must be called on 41 // FILE thread. 42 void FindDevices( 43 const uint16 vendor_id, 44 const uint16 product_id, 45 int interface_id, 46 const base::Callback<void(ScopedDeviceVector vector)>& callback); 47 48 // Get all of the devices attached to the system, inserting them into 49 // |devices|. Clears |devices| before use. The result will be sorted by id 50 // in increasing order. Must be called on FILE thread. 51 void GetDevices(std::vector<scoped_refptr<UsbDevice> >* devices); 52 53 private: 54 friend struct DefaultSingletonTraits<UsbService>; 55 friend class base::DeleteHelper<UsbService>; 56 57 UsbService(); 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 // This method is called when permission broker replied our request. 67 // We will simply relay it to FILE thread. 68 void OnRequestUsbAccessReplied( 69 const uint16 vendor_id, 70 const uint16 product_id, 71 const base::Callback<void(ScopedDeviceVector vector)>& callback, 72 bool success); 73 74 // FindDevicesImpl is called by FindDevices on ChromeOS after the permission 75 // broker has signaled that permission has been granted to access the 76 // underlying device nodes. On other platforms, it is called directly by 77 // FindDevices. 78 void FindDevicesImpl( 79 const uint16 vendor_id, 80 const uint16 product_id, 81 const base::Callback<void(ScopedDeviceVector vector)>& callback, 82 bool success); 83 84 // Enumerate USB devices from OS and Update devices_ map. 85 void RefreshDevices(); 86 87 scoped_refptr<UsbContext> context_; 88 89 // The map from PlatformUsbDevices to UsbDevices. 90 typedef std::map<PlatformUsbDevice, scoped_refptr<UsbDevice> > DeviceMap; 91 DeviceMap devices_; 92 93 DISALLOW_COPY_AND_ASSIGN(UsbService); 94 }; 95 96 #endif // CHROME_BROWSER_USB_USB_SERVICE_H_ 97
