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 device {
  15
  16 class HidConnection;
  17
  18 class HidServiceLinux : public HidService {
  19  public:
  20   HidServiceLinux(scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
  21
  22   void Connect(const HidDeviceId& device_id,
  23                const ConnectCallback& callback) override;
  24
  25  private:
  26   struct ConnectParams;
  27   class FileThreadHelper;
  28
  29   ~HidServiceLinux() override;
  30
  31   // Constructs this services helper object that lives on the FILE thread.
  32   static void StartHelper(
  33       base::WeakPtr<HidServiceLinux> weak_ptr,
  34       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
  35
  36   // These functions implement the process of locating, requesting access to and
  37   // opening a device. Because this operation crosses multiple threads these
  38   // functions are static and the necessary parameters are passed as a single
  39   // struct.
  40 #if defined(OS_CHROMEOS)
  41   static void OnRequestPathAccessComplete(scoped_ptr<ConnectParams> params,
  42                                           bool success);
  43 #endif  // defined(OS_CHROMEOS)
  44   static void OpenDevice(scoped_ptr<ConnectParams> params);
  45   static void ConnectImpl(scoped_ptr<ConnectParams> params);
  46
  47   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  48   scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
  49
  50   // The helper lives on the FILE thread and holds a weak reference back to the
  51   // service that owns it.
  52   scoped_ptr<FileThreadHelper> helper_;
  53   base::WeakPtrFactory<HidServiceLinux> weak_factory_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(HidServiceLinux);
  56 };
  57
  58 }  // namespace device
  59
  60 #endif  // DEVICE_HID_HID_SERVICE_LINUX_H_