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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 types
import time
from typing import Type
from typing import Optional
import gpiod
from ....logging import get_logger
# =====
class Gpio:
def __init__(
self,
device_path: str,
reset_pin: int,
reset_inverted: bool,
reset_delay: float,
) -> None:
self.__device_path = device_path
self.__reset_pin = reset_pin
self.__reset_inverted = reset_inverted
self.__reset_delay = reset_delay
self.__chip: Optional[gpiod.Chip] = None
self.__reset_line: Optional[gpiod.Line] = None
def __enter__(self) -> None:
if self.__reset_pin >= 0:
assert self.__chip is None
assert self.__reset_line is None
self.__chip = gpiod.Chip(self.__device_path)
self.__reset_line = self.__chip.get_line(self.__reset_pin)
self.__reset_line.request("kvmd::hid::reset", gpiod.LINE_REQ_DIR_OUT, default_vals=[int(self.__reset_inverted)])
def __exit__(
self,
_exc_type: Type[BaseException],
_exc: BaseException,
_tb: types.TracebackType,
) -> None:
if self.__chip:
try:
self.__chip.close()
except Exception:
pass
self.__reset_line = None
self.__chip = None
def reset(self) -> None:
if self.__reset_pin >= 0:
assert self.__reset_line
try:
self.__reset_line.set_value(int(not self.__reset_inverted))
time.sleep(self.__reset_delay)
finally:
self.__reset_line.set_value(int(self.__reset_inverted))
time.sleep(1)
get_logger(0).info("Reset HID performed")
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