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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2024 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
import gpiod
from ....logging import get_logger
# =====
class Gpio: # pylint: disable=too-many-instance-attributes
def __init__(
self,
device_path: str,
power_detect_pin: int,
power_detect_pull_down: bool,
reset_pin: int,
reset_inverted: bool,
reset_delay: float,
) -> None:
self.__device_path = device_path
self.__power_detect_pin = power_detect_pin
self.__power_detect_pull_down = power_detect_pull_down
self.__reset_pin = reset_pin
self.__reset_inverted = reset_inverted
self.__reset_delay = reset_delay
self.__line_request: (gpiod.LineRequest | None) = None
self.__last_power: (bool | None) = None
def __enter__(self) -> None:
if self.__power_detect_pin >= 0 or self.__reset_pin >= 0:
assert self.__line_request is None
config: dict[int, gpiod.LineSettings] = {}
if self.__power_detect_pin >= 0:
config[self.__power_detect_pin] = gpiod.LineSettings(
direction=gpiod.line.Direction.INPUT,
bias=(gpiod.line.Bias.PULL_DOWN if self.__power_detect_pull_down else gpiod.line.Bias.AS_IS),
)
if self.__reset_pin >= 0:
config[self.__reset_pin] = gpiod.LineSettings(
direction=gpiod.line.Direction.OUTPUT,
output_value=gpiod.line.Value(self.__reset_inverted),
)
assert len(config) > 0
self.__line_request = gpiod.request_lines(
self.__device_path,
consumer="kvmd::hid",
config=config,
)
def __exit__(
self,
_exc_type: type[BaseException],
_exc: BaseException,
_tb: types.TracebackType,
) -> None:
if self.__line_request:
try:
self.__line_request.release()
except Exception:
pass
self.__last_power = None
self.__line_request = None
def is_powered(self) -> bool:
if self.__power_detect_pin >= 0:
assert self.__line_request
power = bool(self.__line_request.get_value(self.__power_detect_pin).value)
if power != self.__last_power:
get_logger(0).info("HID power state changed: %s -> %s", self.__last_power, power)
self.__last_power = power
return power
return True
def reset(self) -> None:
if self.__reset_pin >= 0:
assert self.__line_request
try:
self.__line_request.set_value(self.__reset_pin, gpiod.line.Value(not self.__reset_inverted))
time.sleep(self.__reset_delay)
finally:
self.__line_request.set_value(self.__reset_pin, gpiod.line.Value(self.__reset_inverted))
time.sleep(1)
get_logger(0).info("Reset HID performed")
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