device/hid/hid_service_win.h

   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_HID_SERVICE_WIN_H_
   6 #define DEVICE_HID_HID_SERVICE_WIN_H_
   7
   8 #include <windows.h>
   9 #include <hidclass.h>
  10
  11 extern "C" {
  12 #include <hidsdi.h>
  13 #include <hidpi.h>
  14 }
  15
  16 #include "base/memory/scoped_ptr.h"
  17 #include "base/memory/weak_ptr.h"
  18 #include "base/scoped_observer.h"
  19 #include "base/win/scoped_handle.h"
  20 #include "device/core/device_monitor_win.h"
  21 #include "device/hid/hid_device_info.h"
  22 #include "device/hid/hid_service.h"
  23
  24 namespace base {
  25 namespace win {
  26 class MessageWindow;
  27 }
  28 }
  29
  30 namespace device {
  31
  32 class HidServiceWin : public HidService, public DeviceMonitorWin::Observer {
  33  public:
  34   HidServiceWin(scoped_refptr<base::SingleThreadTaskRunner> file_task_runner);
  35
  36   virtual void Connect(const HidDeviceId& device_id,
  37                        const ConnectCallback& callback) override;
  38
  39  private:
  40   virtual ~HidServiceWin();
  41
  42   static void EnumerateOnFileThread(
  43       base::WeakPtr<HidServiceWin> service,
  44       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
  45   static void CollectInfoFromButtonCaps(PHIDP_PREPARSED_DATA preparsed_data,
  46                                         HIDP_REPORT_TYPE report_type,
  47                                         USHORT button_caps_length,
  48                                         HidCollectionInfo* collection_info);
  49   static void CollectInfoFromValueCaps(PHIDP_PREPARSED_DATA preparsed_data,
  50                                        HIDP_REPORT_TYPE report_type,
  51                                        USHORT value_caps_length,
  52                                        HidCollectionInfo* collection_info);
  53   static void AddDeviceOnFileThread(
  54       base::WeakPtr<HidServiceWin> service,
  55       scoped_refptr<base::SingleThreadTaskRunner> task_runner,
  56       const std::string& device_path);
  57
  58   // DeviceMonitorWin::Observer implementation:
  59   void OnDeviceAdded(const GUID& class_guid,
  60                      const std::string& device_path) override;
  61   void OnDeviceRemoved(const GUID& class_guid,
  62                        const std::string& device_path) override;
  63
  64   // Tries to open the device read-write and falls back to read-only.
  65   static base::win::ScopedHandle OpenDevice(const std::string& device_path);
  66
  67   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  68   scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
  69   ScopedObserver<DeviceMonitorWin, DeviceMonitorWin::Observer> device_observer_;
  70   base::WeakPtrFactory<HidServiceWin> weak_factory_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(HidServiceWin);
  73 };
  74
  75 }  // namespace device
  76
  77 #endif  // DEVICE_HID_HID_SERVICE_WIN_H_