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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_USB_USB_DEVICE_H_
#define DEVICE_USB_USB_DEVICE_H_
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
namespace device {
class UsbDeviceHandle;
struct UsbConfigDescriptor;
// A UsbDevice object represents a detected USB device, providing basic
// information about it. For further manipulation of the device, a
// UsbDeviceHandle must be created from Open() method.
class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
public:
class Observer {
public:
virtual void OnDisconnect(scoped_refptr<UsbDevice> device) = 0;
};
// Accessors to basic information.
uint16 vendor_id() const { return vendor_id_; }
uint16 product_id() const { return product_id_; }
uint32 unique_id() const { return unique_id_; }
#if defined(OS_CHROMEOS)
// On ChromeOS, if an interface of a claimed device is not claimed, the
// permission broker can change the owner of the device so that the unclaimed
// interfaces can be used. If this argument is missing, permission broker will
// not be used and this method fails if the device is claimed.
virtual void RequestUsbAccess(
int interface_id,
const base::Callback<void(bool success)>& callback) = 0;
#endif // OS_CHROMEOS
// Creates a UsbDeviceHandle for further manipulation.
// Blocking method. Must be called on FILE thread.
virtual scoped_refptr<UsbDeviceHandle> Open() = 0;
// Explicitly closes a device handle. This method will be automatically called
// by the destructor of a UsbDeviceHandle as well.
// Closing a closed handle is a safe
// Blocking method. Must be called on FILE thread.
virtual bool Close(scoped_refptr<UsbDeviceHandle> handle) = 0;
// Gets the UsbConfigDescriptor for the active device configuration.
// Blocking method. Must be called on FILE thread.
virtual const UsbConfigDescriptor& GetConfiguration() = 0;
void AddObserver(Observer* obs) { observer_list_.AddObserver(obs); }
void RemoveObserver(Observer* obs) { observer_list_.RemoveObserver(obs); }
protected:
UsbDevice(uint16 vendor_id, uint16 product_id, uint32 unique_id);
virtual ~UsbDevice();
void NotifyDisconnect();
private:
friend class base::RefCountedThreadSafe<UsbDevice>;
const uint16 vendor_id_;
const uint16 product_id_;
const uint32 unique_id_;
ObserverList<Observer> observer_list_;
DISALLOW_COPY_AND_ASSIGN(UsbDevice);
};
} // namespace device
#endif // DEVICE_USB_USB_DEVICE_H_
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