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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 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 aiotools
from ... import usb
from ...yamlconf import Section
from ...validators.basic import valid_stripped_string_not_empty
from . import BaseUserGpioDriver
# =====
class Plugin(BaseUserGpioDriver):
def __init__(
self,
instance_name: str,
notifier: aiotools.AioNotifier,
otg_config: Section, # XXX: Not from options, see /kvmd/apps/kvmd/__init__.py for details
) -> None:
super().__init__(instance_name, notifier)
self.__udc: str = otg_config.udc
self.__init_delay: float = otg_config.init_delay
gadget: str = otg_config.gadget
self.__udc_path = usb.get_gadget_path(gadget, usb.G_UDC)
self.__functions_path = usb.get_gadget_path(gadget, usb.G_FUNCTIONS)
self.__profile_path = usb.get_gadget_path(gadget, usb.G_PROFILE)
self.__lock = asyncio.Lock()
@classmethod
def get_pin_validator(cls) -> Callable[[Any], Any]:
return valid_stripped_string_not_empty
def prepare(self) -> None:
self.__udc = usb.find_udc(self.__udc)
get_logger().info("Using UDC %s", self.__udc)
async def run(self) -> None:
logger = get_logger(0)
while True:
try:
while True:
self._notifier.notify()
if os.path.isfile(self.__udc_path):
break
await asyncio.sleep(5)
with Inotify() as inotify:
await inotify.watch(InotifyMask.ALL_MODIFY_EVENTS, os.path.dirname(self.__udc_path))
await inotify.watch(InotifyMask.ALL_MODIFY_EVENTS, self.__profile_path)
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:
self._notifier.notify()
except Exception:
logger.exception("Unexpected OTG-bind watcher error")
await asyncio.sleep(1)
async def read(self, pin: str) -> bool:
if pin == "udc":
return self.__is_udc_enabled()
return os.path.exists(self.__get_fdest_path(pin))
async def write(self, pin: str, state: bool) -> None:
async with self.__lock:
if self.read(pin) == state:
return
if pin == "udc":
if state:
self.__recreate_profile()
self.__set_udc_enabled(state)
else:
if self.__is_udc_enabled():
self.__set_udc_enabled(False)
try:
if state:
os.symlink(self.__get_fsrc_path(pin), self.__get_fdest_path(pin))
else:
os.unlink(self.__get_fdest_path(pin))
except (FileNotFoundError, FileExistsError):
pass
finally:
self.__recreate_profile()
try:
await asyncio.sleep(self.__init_delay)
finally:
self.__set_udc_enabled(True)
def __recreate_profile(self) -> None:
# XXX: See pikvm/pikvm#1235
# After unbind and bind, the gadgets stop working,
# unless we recreate their links in the profile.
# Some kind of kernel bug.
for func in os.listdir(self.__profile_path):
path = self.__get_fdest_path(func)
if os.path.islink(path):
try:
os.unlink(path)
os.symlink(self.__get_fsrc_path(func), path)
except (FileNotFoundError, FileNotFoundError):
pass
def __get_fsrc_path(self, func: str) -> str:
return os.path.join(self.__functions_path, func)
def __get_fdest_path(self, func: str) -> str:
return os.path.join(self.__profile_path, func)
def __set_udc_enabled(self, enabled: bool) -> None:
with open(self.__udc_path, "w") as file:
file.write(self.__udc if enabled else "\n")
def __is_udc_enabled(self) -> bool:
with open(self.__udc_path) as file:
return bool(file.read().strip())
def __str__(self) -> str:
return f"GPIO({self._instance_name})"
__repr__ = __str__
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