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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import asyncio
import threading
from typing import Tuple
from typing import Dict
from typing import Optional
import gpiod
from . import aiotools
# =====
# XXX: Do not use this variable for any purpose other than testing.
# It can be removed at any time.
DEVICE_PATH = os.getenv("KVMD_GPIO_DEVICE_PATH", "/dev/gpiochip0")
# =====
async def pulse(line: gpiod.Line, delay: float, final: float) -> None:
try:
line.set_value(1)
await asyncio.sleep(delay)
finally:
line.set_value(0)
await asyncio.sleep(final)
class AioPinsReader: # pylint: disable=too-many-instance-attributes
def __init__(
self,
path: str,
consumer: str,
pins: Dict[int, bool], # (pin, inverted)
notifier: aiotools.AioNotifier,
) -> None:
self.__path = path
self.__consumer = consumer
self.__pins = pins
self.__notifier = notifier
self.__state = dict.fromkeys(pins, 0)
self.__loop: Optional[asyncio.AbstractEventLoop] = None
self.__thread = threading.Thread(target=self.__run, daemon=True)
self.__stop_event = threading.Event()
def get(self, pin: int) -> bool:
return (bool(self.__state[pin]) ^ self.__pins[pin])
async def poll(self) -> None:
if not self.__pins:
await aiotools.wait_infinite()
else:
assert self.__loop is None
self.__loop = asyncio.get_running_loop()
self.__thread.start()
try:
await aiotools.run_async(self.__thread.join)
finally:
self.__stop_event.set()
await aiotools.run_async(self.__thread.join)
def __run(self) -> None:
with gpiod.Chip(self.__path) as chip:
pins = sorted(self.__pins)
lines = chip.get_lines(pins)
lines.request(self.__consumer, gpiod.LINE_REQ_EV_BOTH_EDGES)
def read_state() -> Dict[int, int]:
return dict(zip(pins, lines.get_values()))
lines.event_wait(nsec=1)
self.__state = read_state()
self.__notify()
while not self.__stop_event.is_set():
changed = False
ev_lines = lines.event_wait(1)
if ev_lines:
for ev_line in ev_lines:
events = ev_line.event_read_multiply()
if events:
(pin, value) = self.__parse_event(events[-1])
if self.__state[pin] != value:
self.__state[pin] = value
changed = True
else: # Timeout
# Ensure state to avoid driver bugs
state = read_state()
if self.__state != state:
self.__state = state
changed = True
if changed:
self.__notify()
def __parse_event(self, event: gpiod.LineEvent) -> Tuple[int, int]:
pin = event.source.offset()
if event.type == gpiod.LineEvent.RISING_EDGE:
return (pin, 1)
elif event.type == gpiod.LineEvent.FALLING_EDGE:
return (pin, 0)
raise RuntimeError(f"Invalid event {event} type: {event.type}")
def __notify(self) -> None:
assert self.__loop
self.__loop.call_soon_threadsafe(self.__notifier.notify_sync)
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