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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.
#include <stdint.h>
#include <list>
#include <memory>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "base/strings/string16.h"
#include "device/usb/usb_descriptors.h"
#include "url/gurl.h"
namespace device {
class UsbDeviceHandle;
struct WebUsbAllowedOrigins;
// A UsbDevice object represents a detected USB device, providing basic
// information about it. Methods other than simple property accessors must be
// called from the thread on which this object was created. For further
// manipulation of the device, a UsbDeviceHandle must be created from Open()
// method.
class UsbDevice : public base::RefCountedThreadSafe<UsbDevice> {
using OpenCallback = base::Callback<void(scoped_refptr<UsbDeviceHandle>)>;
using ResultCallback = base::Callback<void(bool success)>;
// This observer interface should be used by objects that need only be
// notified about the removal of a particular device as it is more efficient
// than registering a large number of observers with UsbService::AddObserver.
class Observer {
virtual ~Observer();
// This method is called when the UsbService that created this object
// detects that the device has been disconnected from the host.
virtual void OnDeviceRemoved(scoped_refptr<UsbDevice> device);
// A unique identifier which remains stable for the lifetime of this device
// object (i.e., until the device is unplugged or the USB service dies.)
const std::string& guid() const { return guid_; }
// Accessors to basic information.
uint16_t usb_version() const { return usb_version_; }
uint8_t device_class() const { return device_class_; }
uint8_t device_subclass() const { return device_subclass_; }
uint8_t device_protocol() const { return device_protocol_; }
uint16_t vendor_id() const { return vendor_id_; }
uint16_t product_id() const { return product_id_; }
uint16_t device_version() const { return device_version_; }
const base::string16& manufacturer_string() const {
return manufacturer_string_;
const base::string16& product_string() const { return product_string_; }
const base::string16& serial_number() const { return serial_number_; }
const WebUsbAllowedOrigins* webusb_allowed_origins() const {
return webusb_allowed_origins_.get();
const GURL& webusb_landing_page() const { return webusb_landing_page_; }
const std::vector<UsbConfigDescriptor>& configurations() const {
return configurations_;
const UsbConfigDescriptor* active_configuration() const {
return active_configuration_;
// On ChromeOS the permission_broker service must be used to open USB devices.
// This function asks it to check whether a future Open call will be allowed.
// On all other platforms this is a no-op and always returns true.
virtual void CheckUsbAccess(const ResultCallback& callback);
// On Android applications must request permission from the user to access a
// USB device before it can be opened. After permission is granted the device
// properties may contain information not previously available. On all other
// platforms this is a no-op and always returns true.
virtual void RequestPermission(const ResultCallback& callback);
virtual bool permission_granted() const;
// Creates a UsbDeviceHandle for further manipulation.
virtual void Open(const OpenCallback& callback) = 0;
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
friend class UsbService;
UsbDevice(uint16_t usb_version,
uint8_t device_class,
uint8_t device_subclass,
uint8_t device_protocol,
uint16_t vendor_id,
uint16_t product_id,
uint16_t device_version,
const base::string16& manufacturer_string,
const base::string16& product_string,
const base::string16& serial_number);
virtual ~UsbDevice();
void ActiveConfigurationChanged(int configuration_value);
void NotifyDeviceRemoved();
std::list<UsbDeviceHandle*>& handles() { return handles_; }
// These members must be mutable by subclasses as necessary during device
// enumeration. To preserve the thread safety of this object they must remain
// constant afterwards.
uint16_t usb_version_;
uint16_t device_version_;
base::string16 manufacturer_string_;
base::string16 product_string_;
base::string16 serial_number_;
std::unique_ptr<WebUsbAllowedOrigins> webusb_allowed_origins_;
GURL webusb_landing_page_;
// All of the device's configuration descriptors.
std::vector<UsbConfigDescriptor> configurations_;
friend class base::RefCountedThreadSafe<UsbDevice>;
friend class UsbDeviceHandleImpl;
friend class UsbDeviceHandleUsbfs;
friend class UsbServiceAndroid;
friend class UsbServiceImpl;
friend class UsbServiceLinux;
void OnDisconnect();
void HandleClosed(UsbDeviceHandle* handle);
const std::string guid_;
const uint8_t device_class_;
const uint8_t device_subclass_;
const uint8_t device_protocol_;
const uint16_t vendor_id_;
const uint16_t product_id_;
// The current device configuration descriptor. May be null if the device is
// in an unconfigured state; if not null, it is a pointer to one of the
// items at UsbDevice::configurations_.
const UsbConfigDescriptor* active_configuration_ = nullptr;
// Weak pointers to open handles. HandleClosed() will be called before each
// is freed.
std::list<UsbDeviceHandle*> handles_;
base::ObserverList<Observer, true> observer_list_;
} // namespace device