device/hid/hid_service_linux.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_LINUX_H_
   6 #define DEVICE_HID_HID_SERVICE_LINUX_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/macros.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "device/hid/hid_device_info.h"
  12 #include "device/hid/hid_service.h"
  13
  14 namespace dbus {
  15 class FileDescriptor;
  16 }
  17
  18 namespace device {
  19
  20 class HidConnection;
  21
  22 class HidServiceLinux : public HidService {
  23  public:
  24   HidServiceLinux(scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
  25   ~HidServiceLinux() override;
  26
  27   void Connect(const HidDeviceId& device_id,
  28                const ConnectCallback& callback) override;
  29
  30  private:
  31   struct ConnectParams;
  32   class FileThreadHelper;
  33
  34   // These functions implement the process of locating, requesting access to and
  35   // opening a device. Because this operation crosses multiple threads these
  36   // functions are static and the necessary parameters are passed as a single
  37   // struct.
  38 #if defined(OS_CHROMEOS)
  39   static void OnPathOpened(scoped_ptr<ConnectParams> params,
  40                            dbus::FileDescriptor fd);
  41   static void ValidateFdOnBlockingThread(scoped_ptr<ConnectParams> params,
  42                                          dbus::FileDescriptor fd);
  43 #else
  44   static void OpenOnBlockingThread(scoped_ptr<ConnectParams> params);
  45 #endif
  46   static void FinishOpen(scoped_ptr<ConnectParams> params);
  47   static void CreateConnection(scoped_ptr<ConnectParams> params);
  48
  49   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  50   scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
  51
  52   // The helper lives on the FILE thread and holds a weak reference back to the
  53   // service that owns it.
  54   FileThreadHelper* helper_;
  55   base::WeakPtrFactory<HidServiceLinux> weak_factory_;
  56
  57   DISALLOW_COPY_AND_ASSIGN(HidServiceLinux);
  58 };
  59
  60 }  // namespace device
  61
  62 #endif  // DEVICE_HID_HID_SERVICE_LINUX_H_