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      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_USB_USB_DEVICE_IMPL_H_
      6 #define DEVICE_USB_USB_DEVICE_IMPL_H_
      7 
      8 #include <vector>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/callback.h"
     12 #include "base/threading/thread_checker.h"
     13 #include "device/usb/usb_descriptors.h"
     14 #include "device/usb/usb_device.h"
     15 
     16 struct libusb_device;
     17 struct libusb_config_descriptor;
     18 
     19 namespace base {
     20 class SingleThreadTaskRunner;
     21 }
     22 
     23 namespace device {
     24 
     25 class UsbDeviceHandleImpl;
     26 class UsbContext;
     27 
     28 typedef libusb_device* PlatformUsbDevice;
     29 typedef libusb_config_descriptor* PlatformUsbConfigDescriptor;
     30 
     31 class UsbDeviceImpl : public UsbDevice {
     32  public:
     33 // UsbDevice implementation:
     34 #if defined(OS_CHROMEOS)
     35   virtual void RequestUsbAccess(
     36       int interface_id,
     37       const base::Callback<void(bool success)>& callback) OVERRIDE;
     38 #endif  // OS_CHROMEOS
     39   virtual scoped_refptr<UsbDeviceHandle> Open() OVERRIDE;
     40   virtual bool Close(scoped_refptr<UsbDeviceHandle> handle) OVERRIDE;
     41   virtual const UsbConfigDescriptor& GetConfiguration() OVERRIDE;
     42   virtual bool GetManufacturer(base::string16* manufacturer) OVERRIDE;
     43   virtual bool GetProduct(base::string16* product) OVERRIDE;
     44   virtual bool GetSerialNumber(base::string16* serial_number) OVERRIDE;
     45 
     46  protected:
     47   friend class UsbServiceImpl;
     48 
     49   // Called by UsbServiceImpl only;
     50   UsbDeviceImpl(scoped_refptr<UsbContext> context,
     51                 scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
     52                 PlatformUsbDevice platform_device,
     53                 uint16 vendor_id,
     54                 uint16 product_id,
     55                 uint32 unique_id);
     56 
     57   virtual ~UsbDeviceImpl();
     58 
     59   // Called only be UsbService.
     60   void OnDisconnect();
     61 
     62  private:
     63   base::ThreadChecker thread_checker_;
     64   PlatformUsbDevice platform_device_;
     65 
     66 #if defined(USE_UDEV)
     67   // On Linux these properties are read from sysfs when the device is enumerated
     68   // to avoid hitting the permission broker on Chrome OS for a real string
     69   // descriptor request.
     70   std::string manufacturer_;
     71   std::string product_;
     72   std::string serial_number_;
     73 #endif
     74 
     75   // The active configuration descriptor is not read immediately but cached for
     76   // later use.
     77   bool current_configuration_cached_;
     78   UsbConfigDescriptor current_configuration_;
     79 
     80   // Retain the context so that it will not be released before UsbDevice.
     81   scoped_refptr<UsbContext> context_;
     82 
     83   // Opened handles.
     84   typedef std::vector<scoped_refptr<UsbDeviceHandleImpl> > HandlesVector;
     85   HandlesVector handles_;
     86 
     87   // Reference to the UI thread for permission-broker calls.
     88   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
     89 
     90   DISALLOW_COPY_AND_ASSIGN(UsbDeviceImpl);
     91 };
     92 
     93 }  // namespace device
     94 
     95 #endif  // DEVICE_USB_USB_DEVICE_IMPL_H_
     96