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https://github.com/mofeng-git/One-KVM.git
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78 lines
3.5 KiB
Python
78 lines
3.5 KiB
Python
# ========================================================================== #
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# #
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# KVMD - The main Pi-KVM daemon. #
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# #
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# Copyright (C) 2018-2021 Maxim Devaev <mdevaev@gmail.com> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <https://www.gnu.org/licenses/>. #
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# #
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# ========================================================================== #
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import os
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from ....logging import get_logger
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from .... import env
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from .... import tools
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# =====
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class UsbDeviceController:
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# Проблема в том, что устройство может отвечать EAGAIN или ESHUTDOWN,
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# если оно было отключено физически. См:
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# - https://github.com/raspberrypi/linux/issues/3870
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# - https://github.com/raspberrypi/linux/pull/3151
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# Так что нам нужно проверять состояние контроллера, чтобы не спамить
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# в устройство и отслеживать его состояние.
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def __init__(self, udc: str) -> None:
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self.__udc = udc
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self.__state_path = ""
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def find(self) -> None:
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logger = get_logger()
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path = f"{env.SYSFS_PREFIX}/sys/class/udc"
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try:
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candidates = sorted(os.listdir(path))
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except Exception as err:
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logger.error("Can't list %s: %s: ignored", path, tools.efmt(err))
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return
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udc = ""
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if not self.__udc:
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if len(candidates) == 0:
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logger.error("Can't find any UDC: ignored")
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else:
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udc = candidates[0]
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elif self.__udc not in candidates:
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logger.error("Can't find selected UDC: %s: ignored", self.__udc)
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else:
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udc = self.__udc
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if udc:
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get_logger().info("Using UDC %s", udc)
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self.__state_path = os.path.join(path, udc, "state")
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def can_operate(self) -> bool:
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if self.__state_path:
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try:
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with open(self.__state_path, "r") as state_file:
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# https://www.maxlinear.com/Files/Documents/an213_033111.pdf
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return (state_file.read().strip().lower() == "configured")
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except Exception:
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pass
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return True # При ошибке лучше прикинуться работающим, мало ли что
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