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|
# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2023 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 asyncio
from typing import Callable
from typing import Any
import gpiod
from ... import aiotools
from ...yamlconf import Option
from ...validators.os import valid_abs_path
from ...validators.hw import valid_gpio_pin
from . import UserGpioModes
from . import BaseUserGpioDriver
# =====
class Plugin(BaseUserGpioDriver):
def __init__(
self,
instance_name: str,
notifier: aiotools.AioNotifier,
device_path: str,
) -> None:
super().__init__(instance_name, notifier)
self.__device_path = device_path
self.__tasks: dict[int, (asyncio.Task | None)] = {}
self.__line_request: (gpiod.LineRequest | None) = None
@classmethod
def get_plugin_options(cls) -> dict:
return {
"device": Option("/dev/gpiochip0", type=valid_abs_path, unpack_as="device_path"),
}
@classmethod
def get_modes(cls) -> set[str]:
return set([UserGpioModes.OUTPUT])
@classmethod
def get_pin_validator(cls) -> Callable[[Any], Any]:
return valid_gpio_pin
def register_output(self, pin: str, initial: (bool | None)) -> None:
_ = initial
self.__tasks[int(pin)] = None
def prepare(self) -> None:
self.__line_request = gpiod.request_lines(
self.__device_path,
consumer="kvmd::locator",
config={
tuple(self.__tasks): gpiod.LineSettings(
direction=gpiod.line.Direction.OUTPUT,
output_value=gpiod.line.Value(False),
),
},
)
async def cleanup(self) -> None:
tasks = [
task
for task in self.__tasks.values()
if task is not None
]
for task in tasks:
task.cancel()
await asyncio.gather(*tasks, return_exceptions=True)
if self.__line_request:
try:
self.__line_request.release()
except Exception:
pass
async def read(self, pin: str) -> bool:
return (self.__tasks[int(pin)] is not None)
async def write(self, pin: str, state: bool) -> None:
pin_int = int(pin)
task = self.__tasks[pin_int]
if state and task is None:
self.__tasks[pin_int] = asyncio.create_task(self.__blink(pin_int))
elif not state and task is not None:
task.cancel()
await task
self.__tasks[pin_int] = None
async def __blink(self, pin: int) -> None:
assert pin in self.__tasks
assert self.__line_request
try:
state = True
while True:
self.__line_request.set_value(pin, gpiod.line.Value(state))
state = (not state)
await asyncio.sleep(0.1)
except asyncio.CancelledError:
pass
finally:
self.__line_request.set_value(pin, gpiod.line.Value(False))
def __str__(self) -> str:
return f"Locator({self._instance_name})"
__repr__ = __str__
|
