device/usb/usb_device_impl.h

   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   scoped_refptr<UsbDeviceHandle> Open() override;
  40   bool Close(scoped_refptr<UsbDeviceHandle> handle) override;
  41   const UsbConfigDescriptor& GetConfiguration() override;
  42   bool GetManufacturer(base::string16* manufacturer) override;
  43   bool GetProduct(base::string16* product) override;
  44   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   ~UsbDeviceImpl() override;
  58
  59   // Called only by UsbService.
  60   void OnDisconnect();
  61
  62  private:
  63   base::ThreadChecker thread_checker_;
  64   PlatformUsbDevice platform_device_;
  65
  66   // On Linux these properties are read from sysfs when the device is enumerated
  67   // to avoid hitting the permission broker on Chrome OS for a real string
  68   // descriptor request.
  69   base::string16 manufacturer_;
  70   base::string16 product_;
  71   base::string16 serial_number_;
  72 #if !defined(USE_UDEV)
  73   // On other platforms the device must be opened in order to cache them. This
  74   // should be delayed until the strings are needed to avoid poor interactions
  75   // with other applications.
  76   void CacheStrings();
  77   bool strings_cached_;
  78 #endif
  79 #if defined(OS_CHROMEOS)
  80   // On Chrome OS save the devnode string for requesting path access from
  81   // permission broker.
  82   std::string devnode_;
  83 #endif
  84
  85   // The active configuration descriptor is not read immediately but cached for
  86   // later use.
  87   bool current_configuration_cached_;
  88   UsbConfigDescriptor current_configuration_;
  89
  90   // Retain the context so that it will not be released before UsbDevice.
  91   scoped_refptr<UsbContext> context_;
  92
  93   // Opened handles.
  94   typedef std::vector<scoped_refptr<UsbDeviceHandleImpl> > HandlesVector;
  95   HandlesVector handles_;
  96
  97   // Reference to the UI thread for permission-broker calls.
  98   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
  99
 100   DISALLOW_COPY_AND_ASSIGN(UsbDeviceImpl);
 101 };
 102
 103 }  // namespace device
 104
 105 #endif  // DEVICE_USB_USB_DEVICE_IMPL_H_