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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 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 Dict
from typing import Set
from typing import Callable
from typing import Optional
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, Optional[asyncio.Task]] = {}
self.__chip: Optional[gpiod.Chip] = None
self.__lines: Dict[int, gpiod.Line] = {}
@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: Optional[bool]) -> None:
_ = initial
self.__tasks[int(pin)] = None
def prepare(self) -> None:
self.__chip = gpiod.Chip(self.__device_path)
for pin in self.__tasks:
line = self.__chip.get_line(pin)
line.request("kvmd::locator::outputs", gpiod.LINE_REQ_DIR_OUT, default_vals=[0])
self.__lines[pin] = line
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.__chip:
try:
self.__chip.close()
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:
line = self.__lines[pin]
try:
state = 1
while True:
line.set_value(state)
state = int(not state)
await asyncio.sleep(0.1)
except asyncio.CancelledError:
pass
finally:
line.set_value(0)
def __str__(self) -> str:
return f"Locator({self._instance_name})"
__repr__ = __str__
|
