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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 #ifndef DEVICE_USB_USB_SERVICE_H_
6 #define DEVICE_USB_USB_SERVICE_H_
7 
8 #include <vector>
9 
10 #include "base/memory/ref_counted.h"
11 #include "base/memory/scoped_ptr.h"
12 #include "base/threading/non_thread_safe.h"
13 
14 namespace base {
15 class SingleThreadTaskRunner;
16 }
17 
18 namespace device {
19 
20 class UsbDevice;
21 
22 // The USB service handles creating and managing an event handler thread that is
23 // used to manage and dispatch USB events. It is also responsible for device
24 // discovery on the system, which allows it to re-use device handles to prevent
25 // competition for the same USB device.
26 class UsbService : public base::NonThreadSafe {
27  public:
28   // Must be called on a thread with a MessageLoopForIO (for example
29   // BrowserThread::FILE). The UI task runner reference is used to talk to the
30   // PermissionBrokerClient on ChromeOS (UI thread). Returns NULL when
31   // initialization fails.
32   static UsbService* GetInstance(
33       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
34 
35   static void SetInstanceForTest(UsbService* instance);
36 
37   virtual scoped_refptr<UsbDevice> GetDeviceById(uint32 unique_id) = 0;
38 
39   // Get all of the devices attached to the system, inserting them into
40   // |devices|. Clears |devices| before use. The result will be sorted by id
41   // in increasing order. Must be called on FILE thread.
42   virtual void GetDevices(std::vector<scoped_refptr<UsbDevice> >* devices) = 0;
43 
44  protected:
45   friend struct base::DefaultDeleter<UsbService>;
46   UsbService() {}
47   virtual ~UsbService() {}
48   DISALLOW_COPY_AND_ASSIGN(UsbService);
49 };
50 
51 }  // namespace device
52 
53 #endif  // DEVICE_USB_USB_SERVICE_H_
54