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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 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
import asyncio
from typing import Callable
from typing import Any
from ...logging import get_logger
from ...inotify import InotifyMask
from ...inotify import Inotify
from ... import env
from ... import aiotools
from ... import usb
from . import BaseUserGpioDriver
# =====
class Plugin(BaseUserGpioDriver):
def __init__(
self,
instance_name: str,
notifier: aiotools.AioNotifier,
udc: str, # XXX: Not from options, see /kvmd/apps/kvmd/__init__.py for details
gadget: str, # ditto
) -> None:
super().__init__(instance_name, notifier)
self.__udc = udc
self.__ctl_path = f"{env.SYSFS_PREFIX}/sys/kernel/config/usb_gadget/{gadget}/UDC"
@classmethod
def get_pin_validator(cls) -> Callable[[Any], Any]:
return str
def prepare(self) -> None:
self.__udc = usb.find_udc(self.__udc)[0]
get_logger().info("Using UDC %s", self.__udc)
async def run(self) -> None:
logger = get_logger(0)
while True:
try:
while True:
await self._notifier.notify()
if os.path.isfile(self.__ctl_path):
break
await asyncio.sleep(5)
with Inotify() as inotify:
inotify.watch(os.path.dirname(self.__ctl_path), InotifyMask.ALL_MODIFY_EVENTS)
await self._notifier.notify()
while True:
need_restart = False
need_notify = False
for event in (await inotify.get_series(timeout=1)):
need_notify = True
if event.mask & (InotifyMask.DELETE_SELF | InotifyMask.MOVE_SELF | InotifyMask.UNMOUNT):
logger.warning("Got fatal inotify event: %s; reinitializing OTG-bind ...", event)
need_restart = True
break
if need_restart:
break
if need_notify:
await self._notifier.notify()
except Exception:
logger.exception("Unexpected OTG-bind watcher error")
async def cleanup(self) -> None:
with open(self.__ctl_path) as ctl_file:
ctl_file.write(self.__udc)
async def read(self, pin: str) -> bool:
_ = pin
with open(self.__ctl_path) as ctl_file:
return bool(ctl_file.read().strip())
async def write(self, pin: str, state: bool) -> None:
_ = pin
with open(self.__ctl_path, "w") as ctl_file:
ctl_file.write(self.__udc if state else "\n")
def __str__(self) -> str:
return f"GPIO({self._instance_name})"
__repr__ = __str__
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