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# ========================================================================== #
# #
# KVMD - The main PiKVM 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 typing import Tuple
from .logging import get_logger
from . import env
# =====
def find_udc(udc: str) -> Tuple[str, str]:
path = f"{env.SYSFS_PREFIX}/sys/class/udc"
candidates = sorted(os.listdir(path))
if not udc:
if len(candidates) == 0:
raise RuntimeError("Can't find any UDC")
udc = candidates[0]
elif udc not in candidates:
raise RuntimeError(f"Can't find selected UDC: {udc}")
driver = os.path.basename(os.readlink(os.path.join(path, udc, "device/driver")))
return (udc, driver) # (fe980000.usb, dwc2)
class UsbDeviceController:
def __init__(self, udc: str) -> None:
self.__udc = udc
self.__state_path = ""
def find(self) -> None:
udc = find_udc(self.__udc)[0]
self.__state_path = os.path.join(f"{env.SYSFS_PREFIX}/sys/class/udc", udc, "state")
get_logger().info("Using UDC %s", udc)
def can_operate(self) -> bool:
assert self.__state_path
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")
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