325 lines
9.4 KiB
Python
325 lines
9.4 KiB
Python
import usb_hid
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from micropython import const
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from storage import getmount
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from kmk.keys import FIRST_KMK_INTERNAL_KEY, ConsumerKey, ModifierKey
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try:
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from adafruit_ble import BLERadio
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from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
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from adafruit_ble.services.standard.hid import HIDService
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except ImportError:
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# BLE not supported on this platform
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pass
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class HIDModes:
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NOOP = 0 # currently unused; for testing?
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USB = 1
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BLE = 2
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ALL_MODES = (NOOP, USB, BLE)
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class HIDReportTypes:
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KEYBOARD = 1
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MOUSE = 2
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CONSUMER = 3
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SYSCONTROL = 4
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class HIDUsage:
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KEYBOARD = 0x06
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MOUSE = 0x02
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CONSUMER = 0x01
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SYSCONTROL = 0x80
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class HIDUsagePage:
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CONSUMER = 0x0C
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KEYBOARD = MOUSE = SYSCONTROL = 0x01
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HID_REPORT_SIZES = {
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HIDReportTypes.KEYBOARD: 8,
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HIDReportTypes.MOUSE: 4,
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HIDReportTypes.CONSUMER: 2,
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HIDReportTypes.SYSCONTROL: 8, # TODO find the correct value for this
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}
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class AbstractHID:
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REPORT_BYTES = 8
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def __init__(self, **kwargs):
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self._prev_evt = bytearray(self.REPORT_BYTES)
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self._evt = bytearray(self.REPORT_BYTES)
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self.report_device = memoryview(self._evt)[0:1]
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self.report_device[0] = HIDReportTypes.KEYBOARD
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# Landmine alert for HIDReportTypes.KEYBOARD: byte index 1 of this view
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# is "reserved" and evidently (mostly?) unused. However, other modes (or
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# at least consumer, so far) will use this byte, which is the main reason
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# this view exists. For KEYBOARD, use report_mods and report_non_mods
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self.report_keys = memoryview(self._evt)[1:]
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self.report_mods = memoryview(self._evt)[1:2]
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self.report_non_mods = memoryview(self._evt)[3:]
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self.post_init()
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def __repr__(self):
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return '{}(REPORT_BYTES={})'.format(self.__class__.__name__, self.REPORT_BYTES)
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def post_init(self):
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pass
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def create_report(self, keys_pressed):
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self.clear_all()
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consumer_key = None
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for key in keys_pressed:
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if isinstance(key, ConsumerKey):
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consumer_key = key
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break
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reporting_device = self.report_device[0]
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needed_reporting_device = HIDReportTypes.KEYBOARD
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if consumer_key:
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needed_reporting_device = HIDReportTypes.CONSUMER
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if reporting_device != needed_reporting_device:
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# If we are about to change reporting devices, release
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# all keys and close our proverbial tab on the existing
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# device, or keys will get stuck (mostly when releasing
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# media/consumer keys)
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self.send()
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self.report_device[0] = needed_reporting_device
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if consumer_key:
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self.add_key(consumer_key)
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else:
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for key in keys_pressed:
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if key.code >= FIRST_KMK_INTERNAL_KEY:
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continue
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if isinstance(key, ModifierKey):
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self.add_modifier(key)
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else:
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self.add_key(key)
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if key.has_modifiers:
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for mod in key.has_modifiers:
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self.add_modifier(mod)
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return self
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def hid_send(self, evt):
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# Don't raise a NotImplementedError so this can serve as our "dummy" HID
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# when MCU/board doesn't define one to use (which should almost always be
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# the CircuitPython-targeting one, except when unit testing or doing
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# something truly bizarre. This will likely change eventually when Bluetooth
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# is added)
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pass
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def send(self):
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changed = not self._evt.startswith(self._prev_evt)
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if changed:
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self._prev_evt[:] = self._evt
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self.hid_send(self._evt)
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return self
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def clear_all(self):
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for idx, _ in enumerate(self.report_keys):
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self.report_keys[idx] = 0x00
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return self
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def clear_non_modifiers(self):
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for idx, _ in enumerate(self.report_non_mods):
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self.report_non_mods[idx] = 0x00
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return self
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def add_modifier(self, modifier):
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if isinstance(modifier, ModifierKey):
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if modifier.code == ModifierKey.FAKE_CODE:
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for mod in modifier.has_modifiers:
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self.report_mods[0] |= mod
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else:
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self.report_mods[0] |= modifier.code
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else:
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self.report_mods[0] |= modifier
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return self
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def remove_modifier(self, modifier):
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if isinstance(modifier, ModifierKey):
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if modifier.code == ModifierKey.FAKE_CODE:
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for mod in modifier.has_modifiers:
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self.report_mods[0] ^= mod
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else:
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self.report_mods[0] ^= modifier.code
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else:
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self.report_mods[0] ^= modifier
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return self
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def add_key(self, key):
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# Try to find the first empty slot in the key report, and fill it
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placed = False
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where_to_place = self.report_non_mods
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if self.report_device[0] == HIDReportTypes.CONSUMER:
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where_to_place = self.report_keys
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for idx, _ in enumerate(where_to_place):
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if where_to_place[idx] == 0x00:
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where_to_place[idx] = key.code
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placed = True
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break
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if not placed:
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# TODO what do we do here?......
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pass
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return self
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def remove_key(self, key):
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where_to_place = self.report_non_mods
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if self.report_device[0] == HIDReportTypes.CONSUMER:
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where_to_place = self.report_keys
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for idx, _ in enumerate(where_to_place):
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if where_to_place[idx] == key.code:
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where_to_place[idx] = 0x00
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return self
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class USBHID(AbstractHID):
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REPORT_BYTES = 9
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def post_init(self):
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self.devices = {}
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for device in usb_hid.devices:
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us = device.usage
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up = device.usage_page
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if up == HIDUsagePage.CONSUMER and us == HIDUsage.CONSUMER:
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self.devices[HIDReportTypes.CONSUMER] = device
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continue
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if up == HIDUsagePage.KEYBOARD and us == HIDUsage.KEYBOARD:
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self.devices[HIDReportTypes.KEYBOARD] = device
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continue
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if up == HIDUsagePage.MOUSE and us == HIDUsage.MOUSE:
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self.devices[HIDReportTypes.MOUSE] = device
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continue
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if up == HIDUsagePage.SYSCONTROL and us == HIDUsage.SYSCONTROL:
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self.devices[HIDReportTypes.SYSCONTROL] = device
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continue
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def hid_send(self, evt):
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# int, can be looked up in HIDReportTypes
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reporting_device_const = evt[0]
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return self.devices[reporting_device_const].send_report(
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evt[1 : HID_REPORT_SIZES[reporting_device_const] + 1]
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)
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class BLEHID(AbstractHID):
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BLE_APPEARANCE_HID_KEYBOARD = const(961)
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# Hardcoded in CPy
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MAX_CONNECTIONS = const(2)
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def __init__(self, ble_name=str(getmount('/').label), **kwargs):
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self.ble_name = ble_name
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super().__init__()
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def post_init(self):
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self.ble = BLERadio()
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self.ble.name = self.ble_name
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self.hid = HIDService()
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self.hid.protocol_mode = 0 # Boot protocol
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# Security-wise this is not right. While you're away someone turns
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# on your keyboard and they can pair with it nice and clean and then
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# listen to keystrokes.
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# On the other hand we don't have LESC so it's like shouting your
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# keystrokes in the air
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if not self.ble.connected or not self.hid.devices:
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self.start_advertising()
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@property
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def devices(self):
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'''Search through the provided list of devices to find the ones with the
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send_report attribute.'''
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if not self.ble.connected:
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return {}
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result = {}
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for device in self.hid.devices:
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if not hasattr(device, 'send_report'):
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continue
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us = device.usage
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up = device.usage_page
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if up == HIDUsagePage.CONSUMER and us == HIDUsage.CONSUMER:
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result[HIDReportTypes.CONSUMER] = device
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continue
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if up == HIDUsagePage.KEYBOARD and us == HIDUsage.KEYBOARD:
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result[HIDReportTypes.KEYBOARD] = device
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continue
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if up == HIDUsagePage.MOUSE and us == HIDUsage.MOUSE:
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result[HIDReportTypes.MOUSE] = device
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continue
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if up == HIDUsagePage.SYSCONTROL and us == HIDUsage.SYSCONTROL:
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result[HIDReportTypes.SYSCONTROL] = device
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continue
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return result
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def hid_send(self, evt):
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if not self.ble.connected:
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return
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# int, can be looked up in HIDReportTypes
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reporting_device_const = evt[0]
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device = self.devices[reporting_device_const]
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report_size = len(device._characteristic.value)
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while len(evt) < report_size + 1:
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evt.append(0)
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return device.send_report(evt[1 : report_size + 1])
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def clear_bonds(self):
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import _bleio
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_bleio.adapter.erase_bonding()
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def start_advertising(self):
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advertisement = ProvideServicesAdvertisement(self.hid)
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advertisement.appearance = self.BLE_APPEARANCE_HID_KEYBOARD
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self.ble.start_advertising(advertisement)
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def stop_advertising(self):
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self.ble.stop_advertising()
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