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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018-2021 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/>. #
# #
# ========================================================================== #
from typing import Dict
from typing import Optional
import gpiod
from ... import aiotools
from ... import aiogp
from ...yamlconf import Option
from ...validators.os import valid_abs_path
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.__input_pins: Dict[int, aiogp.AioReaderPinParams] = {}
self.__output_pins: Dict[int, Optional[bool]] = {}
self.__reader: Optional[aiogp.AioReader] = None
self.__chip: Optional[gpiod.Chip] = None
self.__output_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"),
}
def register_input(self, pin: int, debounce: float) -> None:
self.__input_pins[pin] = aiogp.AioReaderPinParams(False, debounce)
def register_output(self, pin: int, initial: Optional[bool]) -> None:
self.__output_pins[pin] = initial
def prepare(self) -> None:
assert self.__reader is None
self.__reader = aiogp.AioReader(
path=self.__device_path,
consumer="kvmd::gpio::inputs",
pins=self.__input_pins,
notifier=self._notifier,
)
self.__chip = gpiod.Chip(self.__device_path)
for (pin, initial) in self.__output_pins.items():
line = self.__chip.get_line(pin)
line.request("kvmd::gpio::outputs", gpiod.LINE_REQ_DIR_OUT, default_vals=[int(initial or False)])
self.__output_lines[pin] = line
async def run(self) -> None:
assert self.__reader
await self.__reader.poll()
def cleanup(self) -> None:
if self.__chip:
try:
self.__chip.close()
except Exception:
pass
def read(self, pin: int) -> bool:
assert self.__reader
if pin in self.__input_pins:
return self.__reader.get(pin)
return bool(self.__output_lines[pin].get_value())
def write(self, pin: int, state: bool) -> None:
self.__output_lines[pin].set_value(int(state))
def __str__(self) -> str:
return f"GPIO({self._instance_name})"
__repr__ = __str__
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