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# The MIT License (MIT)
#
# Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import struct
from . import standard
"""
CDC specific descriptors
========================
This PDF is a good reference:
https://cscott.net/usb_dev/data/devclass/usbcdc11.pdf
* Author(s): Scott Shawcroft
"""
CDC_CLASS_DEVICE = 0x02
CDC_CLASS_COMM = 0x02
CDC_CLASS_DATA = 0x0A
CDC_SUBCLASS_DLCM = 0x01
CDC_SUBCLASS_ACM = 0x02 # Abstract Control Model
CDC_SUBCLASS_TCM = 0x03
CDC_SUBCLASS_MCCM = 0x04
CDC_SUBCLASS_CCM = 0x05
CDC_SUBCLASS_ETH = 0x06
CDC_SUBCLASS_ATM = 0x07
CDC_PROTOCOL_NONE = 0x0
CDC_PROTOCOL_V25TER = 0x01 # Common AT commands
# Many other protocols omitted.
class Header:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x00
fmt = "<BBB" + "H"
bLength = struct.calcsize(fmt)
def __init__(self, *,
description,
bcdCDC):
self.description = description
self.bcdCDC = bcdCDC
def notes(self):
return [str(self)]
def __bytes__(self):
return struct.pack(self.fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
self.bcdCDC)
class CallManagement:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x01
fmt = "<BBB" + "BB"
bLength = struct.calcsize(fmt)
def __init__(self, *,
description,
bmCapabilities,
bDataInterface):
self.description = description
self.bmCapabilities = bmCapabilities
self.bDataInterface = bDataInterface
def notes(self):
return [str(self)]
def __bytes__(self):
return struct.pack(self.fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
self.bmCapabilities,
self.bDataInterface)
class AbstractControlManagement:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x02
fmt = "<BBB" + "B"
bLength = struct.calcsize(fmt)
def __init__(self, *,
description,
bmCapabilities):
self.description = description
self.bmCapabilities = bmCapabilities
def notes(self):
return [str(self)]
def __bytes__(self):
return struct.pack(self.fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
self.bmCapabilities)
class DirectLineManagement:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x03
fmt = "<BBB" + "B"
bLength = struct.calcsize(fmt)
def __init__(self, *,
description,
bmCapabilities):
self.description = description
self.bmCapabilities = bmCapabilities
def notes(self):
return [str(self)]
def __bytes__(self):
return struct.pack(self.fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
self.bmCapabilities)
class Union:
bDescriptorType = standard.DESCRIPTOR_TYPE_CLASS_SPECIFIC_INTERFACE
bDescriptorSubtype = 0x06
fixed_fmt = "<BBB" + "B" # not including bSlaveInterface_list
fixed_bLength = struct.calcsize(fixed_fmt)
@property
def bLength(self):
return self.fixed_bLength + len(self.bSlaveInterface_list)
def __init__(self, *,
description,
bMasterInterface,
bSlaveInterface_list):
self.description = description
self.bMasterInterface = bMasterInterface
# bSlaveInterface_list is a list of one or more slave interfaces.
self.bSlaveInterface_list = bSlaveInterface_list
def notes(self):
return [str(self)]
def __bytes__(self):
return struct.pack(self.fixed_fmt,
self.bLength,
self.bDescriptorType,
self.bDescriptorSubtype,
self.bMasterInterface) + bytes(self.bSlaveInterface_list)
|
