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# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Implementation of a USB HID mouse.
Two classes are provided by this module. The MouseFeature class implements
the core functionality of a HID mouse and can be included in any HID gadget.
The MouseGadget class implements an example mouse gadget.
"""
import struct
import hid_constants
import hid_descriptors
import hid_gadget
import usb_constants
class MouseFeature(hid_gadget.HidFeature):
"""HID feature implementation for a mouse.
REPORT_DESC provides an example HID report descriptor for a device including
this functionality.
"""
REPORT_DESC = hid_descriptors.ReportDescriptor(
hid_descriptors.UsagePage(0x01), # Generic Desktop
hid_descriptors.Usage(0x02), # Mouse
hid_descriptors.Collection(
hid_constants.CollectionType.APPLICATION,
hid_descriptors.Usage(0x01), # Pointer
hid_descriptors.Collection(
hid_constants.CollectionType.PHYSICAL,
hid_descriptors.UsagePage(0x09), # Buttons
hid_descriptors.UsageMinimum(1),
hid_descriptors.UsageMaximum(3),
hid_descriptors.LogicalMinimum(0, force_length=1),
hid_descriptors.LogicalMaximum(1),
hid_descriptors.ReportCount(3),
hid_descriptors.ReportSize(1),
hid_descriptors.Input(hid_descriptors.Data,
hid_descriptors.Variable,
hid_descriptors.Absolute),
hid_descriptors.ReportCount(1),
hid_descriptors.ReportSize(5),
hid_descriptors.Input(hid_descriptors.Constant),
hid_descriptors.UsagePage(0x01), # Generic Desktop
hid_descriptors.Usage(0x30), # X
hid_descriptors.Usage(0x31), # Y
hid_descriptors.LogicalMinimum(0x81), # -127
hid_descriptors.LogicalMaximum(127),
hid_descriptors.ReportSize(8),
hid_descriptors.ReportCount(2),
hid_descriptors.Input(hid_descriptors.Data,
hid_descriptors.Variable,
hid_descriptors.Relative)
)
)
)
def __init__(self):
super(MouseFeature, self).__init__()
self._buttons = 0
def ButtonDown(self, button):
self._buttons |= button
if self.IsConnected():
self.SendReport(self.EncodeInputReport())
def ButtonUp(self, button):
self._buttons &= ~button
if self.IsConnected():
self.SendReport(self.EncodeInputReport())
def Move(self, x_displacement, y_displacement):
if self.IsConnected():
self.SendReport(self.EncodeInputReport(x_displacement, y_displacement))
def EncodeInputReport(self, x_displacement=0, y_displacement=0):
return struct.pack('Bbb', self._buttons, x_displacement, y_displacement)
def GetInputReport(self):
"""Construct an input report.
See Device Class Definition for Human Interface Devices (HID) Version 1.11
Appendix B.2.
Returns:
A packed input report.
"""
return self.EncodeInputReport()
class MouseGadget(hid_gadget.HidGadget):
"""USB gadget implementation of a HID mouse."""
def __init__(self):
self._feature = MouseFeature()
super(MouseGadget, self).__init__(
report_desc=MouseFeature.REPORT_DESC,
features={0: self._feature},
packet_size=8,
interval_ms=1,
out_endpoint=False,
vendor_id=usb_constants.VendorID.GOOGLE,
product_id=usb_constants.ProductID.GOOGLE_MOUSE_GADGET,
device_version=0x0100)
self.AddStringDescriptor(1, 'Google Inc.')
self.AddStringDescriptor(2, 'Mouse Gadget')
def ButtonDown(self, button):
self._feature.ButtonDown(button)
def ButtonUp(self, button):
self._feature.ButtonUp(button)
def Move(self, x_displacement, y_displacement):
self._feature.Move(x_displacement, y_displacement)
def RegisterHandlers():
"""Registers web request handlers with the application server."""
from tornado import web
class WebConfigureHandler(web.RequestHandler):
def post(self):
gadget = MouseGadget()
server.SwitchGadget(gadget)
class WebClickHandler(web.RequestHandler):
def post(self):
BUTTONS = {
'1': hid_constants.Mouse.BUTTON_1,
'2': hid_constants.Mouse.BUTTON_2,
'3': hid_constants.Mouse.BUTTON_3,
}
button = BUTTONS[self.get_argument('button')]
server.gadget.ButtonDown(button)
server.gadget.ButtonUp(button)
class WebMoveHandler(web.RequestHandler):
def post(self):
x = int(self.get_argument('x'))
y = int(self.get_argument('y'))
server.gadget.Move(x, y)
import server
server.app.add_handlers('.*$', [
(r'/mouse/configure', WebConfigureHandler),
(r'/mouse/move', WebMoveHandler),
(r'/mouse/click', WebClickHandler),
])
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