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# Copyright 2016 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Implement base classes for hid package.
This module provides the base classes implemented by the
platform-specific modules. It includes a base class for
all implementations built on interacting with file-like objects.
"""
class HidDevice(object):
"""Base class for all HID devices in this package."""
@staticmethod
def Enumerate():
"""Enumerates all the hid devices.
This function enumerates all the hid device and provides metadata
for helping the client select one.
Returns:
A list of dictionaries of metadata. Each implementation is required
to provide at least: vendor_id, product_id, product_string, usage,
usage_page, and path.
"""
pass
def __init__(self, path):
"""Initialize the device at path."""
pass
def GetInReportDataLength(self):
"""Returns the max input report data length in bytes.
Returns the max input report data length in bytes. This excludes the
report id.
"""
pass
def GetOutReportDataLength(self):
"""Returns the max output report data length in bytes.
Returns the max output report data length in bytes. This excludes the
report id.
"""
pass
def Write(self, packet):
"""Writes packet to device.
Writes the packet to the device.
Args:
packet: An array of integers to write to the device. Excludes the report
ID. Must be equal to GetOutReportLength().
"""
pass
def Read(self):
"""Reads packet from device.
Reads the packet from the device.
Returns:
An array of integers read from the device. Excludes the report ID.
The length is equal to GetInReportDataLength().
"""
pass
class DeviceDescriptor(object):
"""Descriptor for basic attributes of the device."""
usage_page = None
usage = None
vendor_id = None
product_id = None
product_string = None
path = None
internal_max_in_report_len = 0
internal_max_out_report_len = 0
def ToPublicDict(self):
out = {}
for k, v in list(self.__dict__.items()):
if not k.startswith('internal_'):
out[k] = v
return out