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# ========================================================================== #
# #
# KVMD - The main PiKVM 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 Callable
from typing import Optional
from typing import Any
import gpiod
from ... import aiotools
from ... import aiogp
from ...yamlconf import Option
from ...validators.os import valid_abs_path
from ...validators.hw import valid_gpio_pin
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"),
}
@classmethod
def get_pin_validator(cls) -> Callable[[Any], Any]:
return valid_gpio_pin
def register_input(self, pin: str, debounce: float) -> None:
self.__input_pins[int(pin)] = aiogp.AioReaderPinParams(False, debounce)
def register_output(self, pin: str, initial: Optional[bool]) -> None:
self.__output_pins[int(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()
async def cleanup(self) -> None:
if self.__chip:
try:
self.__chip.close()
except Exception:
pass
async def read(self, pin: str) -> bool:
assert self.__reader
pin_int = int(pin)
if pin_int in self.__input_pins:
return self.__reader.get(pin_int)
return bool(self.__output_lines[pin_int].get_value())
async def write(self, pin: str, state: bool) -> None:
self.__output_lines[int(pin)].set_value(int(state))
def __str__(self) -> str:
return f"GPIO({self._instance_name})"
__repr__ = __str__
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