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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef DEVICE_HID_HID_SERVICE_LINUX_H_
#define DEVICE_HID_HID_SERVICE_LINUX_H_
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "device/hid/hid_device_info.h"
#include "device/hid/hid_service.h"
namespace device {
class HidConnection;
class HidServiceLinux : public HidService {
public:
HidServiceLinux(scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner);
void Connect(const HidDeviceId& device_id,
const ConnectCallback& callback) override;
private:
struct ConnectParams;
class Helper;
friend class Helper;
~HidServiceLinux() override;
// Constructs this services helper object that lives on the FILE thread.
static void StartHelper(
base::WeakPtr<HidServiceLinux> weak_ptr,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
// These functions implement the process of locating, requesting access to and
// opening a device. Because this operation crosses multiple threads these
// functions are static and the necessary parameters are passed as a single
// struct.
#if defined(OS_CHROMEOS)
static void OnRequestPathAccessComplete(scoped_ptr<ConnectParams> params,
bool success);
#endif // defined(OS_CHROMEOS)
static void OpenDevice(scoped_ptr<ConnectParams> params);
static void ConnectImpl(scoped_ptr<ConnectParams> params);
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
// The helper lives on the FILE thread and holds a weak reference back to the
// service that owns it.
base::WeakPtrFactory<HidServiceLinux> weak_factory_;
scoped_ptr<Helper> helper_;
DISALLOW_COPY_AND_ASSIGN(HidServiceLinux);
};
} // namespace device
#endif // DEVICE_HID_HID_SERVICE_LINUX_H_