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|
# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2024 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 json
import contextlib
import dataclasses
import argparse
import time
from typing import Generator
import yaml
from ...validators.basic import valid_stripped_string_not_empty
from ... import usb
from .. import init
# =====
@dataclasses.dataclass(frozen=True)
class _Function:
name: str
desc: str
eps: int
enabled: bool
class _GadgetControl:
def __init__(
self,
meta_path: str,
gadget: str,
udc: str,
eps: int,
init_delay: float,
) -> None:
self.__meta_path = meta_path
self.__gadget = gadget
self.__udc = udc
self.__eps = eps
self.__init_delay = init_delay
@contextlib.contextmanager
def __udc_stopped(self) -> Generator[None, None, None]:
udc = usb.find_udc(self.__udc)
udc_path = usb.get_gadget_path(self.__gadget, usb.G_UDC)
with open(udc_path) as file:
enabled = bool(file.read().strip())
if enabled:
with open(udc_path, "w") as file:
file.write("\n")
try:
yield
finally:
self.__clear_profile(recreate=True)
time.sleep(self.__init_delay)
with open(udc_path, "w") as file:
file.write(udc)
def __clear_profile(self, recreate: bool) -> 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.__get_fdest_path()):
path = self.__get_fdest_path(func)
if os.path.islink(path):
try:
os.unlink(path)
if recreate:
os.symlink(self.__get_fsrc_path(func), path)
except (FileNotFoundError, FileExistsError):
pass
def __read_metas(self) -> Generator[_Function, None, None]:
for name in sorted(os.listdir(self.__meta_path)):
with open(os.path.join(self.__meta_path, name)) as file:
meta = json.loads(file.read())
enabled = os.path.exists(self.__get_fdest_path(meta["function"]))
yield _Function(
name=meta["function"],
desc=meta["description"],
eps=meta["endpoints"],
enabled=enabled,
)
def __get_fsrc_path(self, func: str) -> str:
return usb.get_gadget_path(self.__gadget, usb.G_FUNCTIONS, func)
def __get_fdest_path(self, func: (str | None)=None) -> str:
if func is None:
return usb.get_gadget_path(self.__gadget, usb.G_PROFILE)
return usb.get_gadget_path(self.__gadget, usb.G_PROFILE, func)
def change_functions(self, enable: set[str], disable: set[str]) -> None:
funcs = list(self.__read_metas())
new: set[str] = set(func.name for func in funcs if func.enabled)
new = (new - disable) | enable
eps_req = sum(func.eps for func in funcs if func.name in new)
if eps_req > self.__eps:
raise RuntimeError(f"No available endpoints for this config: {eps_req} required, {self.__eps} is maximum")
with self.__udc_stopped():
self.__clear_profile(recreate=False)
for func in new:
try:
os.symlink(self.__get_fsrc_path(func), self.__get_fdest_path(func))
except FileExistsError:
pass
def list_functions(self) -> None:
funcs = list(self.__read_metas())
eps_used = sum(func.eps for func in funcs if func.enabled)
print(f"# Endpoints used: {eps_used} of {self.__eps}")
print(f"# Endpoints free: {self.__eps - eps_used}")
for func in funcs:
print(f"{'+' if func.enabled else '-'} {func.name} # [{func.eps}] {func.desc}")
def make_gpio_config(self) -> None:
class Dumper(yaml.Dumper):
def increase_indent(self, flow: bool=False, indentless: bool=False) -> None:
_ = indentless
super().increase_indent(flow, False)
def ignore_aliases(self, data) -> bool: # type: ignore
_ = data
return True
class InlineList(list):
pass
def represent_inline_list(dumper: yaml.Dumper, data): # type: ignore
return dumper.represent_sequence("tag:yaml.org,2002:seq", data, flow_style=True)
Dumper.add_representer(InlineList, represent_inline_list)
config = {
"drivers": {"otgconf": {"type": "otgconf"}},
"scheme": {},
"view": {"table": []},
}
for func in self.__read_metas():
config["scheme"][func.name] = { # type: ignore
"driver": "otgconf",
"pin": func.name,
"mode": "output",
"pulse": False,
}
config["view"]["table"].append(InlineList([ # type: ignore
"#" + func.desc,
"#" + func.name,
func.name,
]))
print(yaml.dump({"kvmd": {"gpio": config}}, indent=4, Dumper=Dumper))
def reset(self) -> None:
with self.__udc_stopped():
pass
# =====
def main(argv: (list[str] | None)=None) -> None:
(parent_parser, argv, config) = init(
add_help=False,
cli_logging=True,
argv=argv,
)
parser = argparse.ArgumentParser(
prog="kvmd-otgconf",
description="KVMD OTG low-level runtime configuration tool",
parents=[parent_parser],
)
parser.add_argument("-l", "--list-functions", action="store_true", help="List functions")
parser.add_argument("-e", "--enable-function", nargs="+", default=[], metavar="<name>", help="Enable function(s)")
parser.add_argument("-d", "--disable-function", nargs="+", default=[], metavar="<name>", help="Disable function(s)")
parser.add_argument("-r", "--reset-gadget", action="store_true", help="Reset gadget")
parser.add_argument("--make-gpio-config", action="store_true")
options = parser.parse_args(argv[1:])
gc = _GadgetControl(config.otg.meta, config.otg.gadget, config.otg.udc, config.otg.endpoints, config.otg.init_delay)
if options.list_functions:
gc.list_functions()
elif options.enable_function or options.disable_function:
enable = set(map(valid_stripped_string_not_empty, options.enable_function))
disable = set(map(valid_stripped_string_not_empty, options.disable_function))
gc.change_functions(enable, disable)
gc.list_functions()
elif options.reset_gadget:
gc.reset()
elif options.make_gpio_config:
gc.make_gpio_config()
else:
gc.list_functions()
|
