src/tools/usb_gadget/echo_gadget.py

   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 """USB echo gadget module.
   6
   7 This gadget has pairs of IN/OUT endpoints that echo packets back to the host.
   8 """
   9
  10 import math
  11 import struct
  12 import uuid
  13
  14 import gadget
  15 import usb_constants
  16 import usb_descriptors
  17
  18
  19 class EchoGadget(gadget.Gadget):
  20   """Echo gadget.
  21   """
  22
  23   def __init__(self):
  24     """Create an echo gadget.
  25     """
  26     device_desc = usb_descriptors.DeviceDescriptor(
  27         idVendor=usb_constants.VendorID.GOOGLE,
  28         idProduct=usb_constants.ProductID.GOOGLE_ECHO_GADGET,
  29         bcdUSB=0x0200,
  30         iManufacturer=1,
  31         iProduct=2,
  32         iSerialNumber=3,
  33         bcdDevice=0x0100)
  34
  35     fs_config_desc = usb_descriptors.ConfigurationDescriptor(
  36         bmAttributes=0x80,
  37         MaxPower=50)
  38     fs_intr_interface_desc = usb_descriptors.InterfaceDescriptor(
  39         bInterfaceNumber=0,
  40         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
  41         bInterfaceSubClass=0,
  42         bInterfaceProtocol=0,
  43         iInterface=4,
  44     )
  45     fs_intr_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
  46         bEndpointAddress=0x01,
  47         bmAttributes=usb_constants.TransferType.INTERRUPT,
  48         wMaxPacketSize=64,
  49         bInterval=1  # 1ms
  50     ))
  51     fs_intr_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
  52         bEndpointAddress=0x81,
  53         bmAttributes=usb_constants.TransferType.INTERRUPT,
  54         wMaxPacketSize=64,
  55         bInterval=1  # 1ms
  56     ))
  57     fs_config_desc.AddInterface(fs_intr_interface_desc)
  58
  59     fs_bulk_interface_desc = usb_descriptors.InterfaceDescriptor(
  60         bInterfaceNumber=1,
  61         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
  62         bInterfaceSubClass=0,
  63         bInterfaceProtocol=0,
  64         iInterface=5
  65     )
  66     fs_bulk_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
  67         bEndpointAddress=0x02,
  68         bmAttributes=usb_constants.TransferType.BULK,
  69         wMaxPacketSize=64,
  70         bInterval=0
  71     ))
  72     fs_bulk_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
  73         bEndpointAddress=0x82,
  74         bmAttributes=usb_constants.TransferType.BULK,
  75         wMaxPacketSize=64,
  76         bInterval=0
  77     ))
  78     fs_config_desc.AddInterface(fs_bulk_interface_desc)
  79
  80     fs_config_desc.AddInterface(usb_descriptors.InterfaceDescriptor(
  81         bInterfaceNumber=2,
  82         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
  83         bInterfaceSubClass=0,
  84         bInterfaceProtocol=0,
  85         iInterface=6
  86     ))
  87     fs_isoc_interface_desc = usb_descriptors.InterfaceDescriptor(
  88         bInterfaceNumber=2,
  89         bAlternateSetting=1,
  90         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
  91         bInterfaceSubClass=0,
  92         bInterfaceProtocol=0,
  93         iInterface=6
  94     )
  95     fs_isoc_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
  96         bEndpointAddress=0x03,
  97         bmAttributes=usb_constants.TransferType.ISOCHRONOUS,
  98         wMaxPacketSize=1023,
  99         bInterval=1  # 1ms
 100     ))
 101     fs_isoc_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
 102         bEndpointAddress=0x83,
 103         bmAttributes=usb_constants.TransferType.ISOCHRONOUS,
 104         wMaxPacketSize=1023,
 105         bInterval=1  # 1ms
 106     ))
 107     fs_config_desc.AddInterface(fs_isoc_interface_desc)
 108
 109     hs_config_desc = usb_descriptors.ConfigurationDescriptor(
 110         bmAttributes=0x80,
 111         MaxPower=50)
 112
 113     hs_intr_interface_desc = usb_descriptors.InterfaceDescriptor(
 114         bInterfaceNumber=0,
 115         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
 116         bInterfaceSubClass=0,
 117         bInterfaceProtocol=0,
 118         iInterface=4
 119     )
 120     hs_intr_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
 121         bEndpointAddress=0x01,
 122         bmAttributes=usb_constants.TransferType.INTERRUPT,
 123         wMaxPacketSize=64,
 124         bInterval=4  # 1ms
 125     ))
 126     hs_intr_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
 127         bEndpointAddress=0x81,
 128         bmAttributes=usb_constants.TransferType.INTERRUPT,
 129         wMaxPacketSize=64,
 130         bInterval=4  # 1ms
 131     ))
 132     hs_config_desc.AddInterface(hs_intr_interface_desc)
 133
 134     hs_bulk_interface_desc = usb_descriptors.InterfaceDescriptor(
 135         bInterfaceNumber=1,
 136         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
 137         bInterfaceSubClass=0,
 138         bInterfaceProtocol=0,
 139         iInterface=5
 140     )
 141     hs_bulk_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
 142         bEndpointAddress=0x02,
 143         bmAttributes=usb_constants.TransferType.BULK,
 144         wMaxPacketSize=512,
 145         bInterval=0
 146     ))
 147     hs_bulk_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
 148         bEndpointAddress=0x82,
 149         bmAttributes=usb_constants.TransferType.BULK,
 150         wMaxPacketSize=512,
 151         bInterval=0
 152     ))
 153     hs_config_desc.AddInterface(hs_bulk_interface_desc)
 154
 155     hs_config_desc.AddInterface(usb_descriptors.InterfaceDescriptor(
 156         bInterfaceNumber=2,
 157         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
 158         bInterfaceSubClass=0,
 159         bInterfaceProtocol=0,
 160         iInterface=6
 161     ))
 162     hs_isoc_interface_desc = usb_descriptors.InterfaceDescriptor(
 163         bInterfaceNumber=2,
 164         bAlternateSetting=1,
 165         bInterfaceClass=usb_constants.DeviceClass.VENDOR,
 166         bInterfaceSubClass=0,
 167         bInterfaceProtocol=0,
 168         iInterface=6
 169     )
 170     hs_isoc_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
 171         bEndpointAddress=0x03,
 172         bmAttributes=usb_constants.TransferType.ISOCHRONOUS,
 173         wMaxPacketSize=1024,
 174         bInterval=4  # 1ms
 175     ))
 176     hs_isoc_interface_desc.AddEndpoint(usb_descriptors.EndpointDescriptor(
 177         bEndpointAddress=0x83,
 178         bmAttributes=usb_constants.TransferType.ISOCHRONOUS,
 179         wMaxPacketSize=1024,
 180         bInterval=4  # 1ms
 181     ))
 182     hs_config_desc.AddInterface(hs_isoc_interface_desc)
 183
 184     super(EchoGadget, self).__init__(
 185         device_desc, fs_config_desc, hs_config_desc)
 186     self.AddStringDescriptor(1, 'Google Inc.')
 187     self.AddStringDescriptor(2, 'Echo Gadget')
 188     self.AddStringDescriptor(3, '{:06X}'.format(uuid.getnode()))
 189     self.AddStringDescriptor(4, 'Interrupt Echo')
 190     self.AddStringDescriptor(5, 'Bulk Echo')
 191     self.AddStringDescriptor(6, 'Isochronous Echo')
 192
 193   def ReceivePacket(self, endpoint, data):
 194     """Echo a packet back to the host.
 195
 196     Args:
 197       endpoint: Incoming endpoint (must be an OUT pipe).
 198       data: Packet data.
 199     """
 200     assert endpoint & usb_constants.Dir.IN == 0
 201
 202     self.SendPacket(endpoint | usb_constants.Dir.IN, data)
 203
 204 def RegisterHandlers():
 205   """Registers web request handlers with the application server."""
 206
 207   import server
 208   from tornado import web
 209
 210   class WebConfigureHandler(web.RequestHandler):
 211
 212     def post(self):
 213       server.SwitchGadget(EchoGadget())
 214
 215   server.app.add_handlers('.*$', [
 216       (r'/echo/configure', WebConfigureHandler),
 217   ])