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// Copyright (c) 2012 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 CHROME_BROWSER_USB_USB_SERVICE_H_
#define CHROME_BROWSER_USB_USB_SERVICE_H_
#include <map>
#include <utility>
#include "base/basictypes.h"
#include "base/threading/platform_thread.h"
#include "chrome/browser/profiles/profile_keyed_service.h"
#include "chrome/browser/usb/usb_device.h"
#include "third_party/libusb/libusb.h"
class UsbEventHandler;
typedef libusb_context* PlatformUsbContext;
// The USB service handles creating and managing an event handler thread that is
// used to manage and dispatch USB events. It is also responsbile for device
// discovery on the system, which allows it to re-use device handles to prevent
// competition for the same USB device.
class UsbService : public ProfileKeyedService {
public:
UsbService();
virtual ~UsbService();
// Cleanup must be invoked before the service is destroyed. It interrupts the
// event handling thread and disposes of open devices.
void Cleanup();
// Find the (topologically) first USB device identified by vendor_id and
// product_id. The created device is associated with this service, so that
// it can be used to close the device later.
UsbDevice* FindDevice(const uint16 vendor_id, const uint16 product_id);
// This function should not be called by normal code. It is invoked by a
// UsbDevice's Close function and disposes of the associated platform handle.
void CloseDevice(scoped_refptr<UsbDevice> device);
private:
// Handles a single USB event. If the service is still running after the event
// is handled, posts another HandleEvent callback to the thread.
void HandleEvent();
// PlatformShutdown is invoked after event handling has been suspended and is
// used to free the platform resources associated with the service.
void PlatformShutdown();
PlatformUsbContext context_;
UsbEventHandler *event_handler_;
// The devices_ map contains scoped_refptrs to all open devices, indicated by
// their vendor and product id. This allows for reusing an open device without
// creating another platform handle for it.
typedef std::map<std::pair<uint16, uint16>, scoped_refptr<UsbDevice> >
DeviceMap;
DeviceMap devices_;
DISALLOW_COPY_AND_ASSIGN(UsbService);
};
#endif // CHROME_BROWSER_USB_USB_SERVICE_H_
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