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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2023 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.__chip: (gpiod.Chip | None) = None
self.__power_detect_line: (gpiod.Line | None) = None
self.__reset_line: (gpiod.Line | 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.__chip is None
self.__chip = gpiod.Chip(self.__device_path)
if self.__power_detect_pin >= 0:
assert self.__power_detect_line is None
self.__power_detect_line = self.__chip.get_line(self.__power_detect_pin)
self.__power_detect_line.request(
"kvmd::hid::power_detect", gpiod.LINE_REQ_DIR_IN,
flags=(gpiod.LINE_REQ_FLAG_BIAS_PULL_DOWN if self.__power_detect_pull_down else 0),
)
if self.__reset_pin >= 0:
assert self.__reset_line is None
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.__last_power = None
self.__power_detect_line = None
self.__reset_line = None
self.__chip = None
def is_powered(self) -> bool:
if self.__power_detect_line is not None:
power = bool(self.__power_detect_line.get_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.__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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