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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/>. #
# #
# ========================================================================== #
import os
from ....logging import get_logger
from .... import env
# =====
class UsbDeviceController:
# Проблема в том, что устройство может отвечать EAGAIN или ESHUTDOWN,
# если оно было отключено физически. См:
# - https://github.com/raspberrypi/linux/issues/3870
# - https://github.com/raspberrypi/linux/pull/3151
# Так что нам нужно проверять состояние контроллера, чтобы не спамить
# в устройство и отслеживать его состояние.
def __init__(self, udc: str) -> None:
self.__udc = udc
self.__state_path = ""
def find(self) -> None:
logger = get_logger()
path = f"{env.SYSFS_PREFIX}/sys/class/udc"
try:
candidates = sorted(os.listdir(path))
except Exception as err:
logger.error("Can't list %s: %s: %s: ignored", path, type(err).__name__, err)
return
udc = ""
if not self.__udc:
if len(candidates) == 0:
logger.error("Can't find any UDC: ignored")
else:
udc = candidates[0]
elif self.__udc not in candidates:
logger.error("Can't find selected UDC: %s: ignored", self.__udc)
else:
udc = self.__udc
if udc:
get_logger().info("Using UDC %s", udc)
self.__state_path = os.path.join(path, udc, "state")
def can_operate(self) -> bool:
if self.__state_path:
try:
with open(self.__state_path, "r") as state_file:
# https://www.maxlinear.com/Files/Documents/an213_033111.pdf
return (state_file.read().strip().lower() == "configured")
except Exception:
pass
return True # При ошибке лучше прикинуться работающим, мало ли что
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