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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 sys
import os
import re
import subprocess
import contextlib
import argparse
import time
from typing import IO
from typing import Generator
from typing import Callable
from ...validators.basic import valid_bool
from ...validators.basic import valid_int_f0
# from .. import init
# =====
@contextlib.contextmanager
def _smart_open(path: str, mode: str) -> Generator[IO, None, None]:
fd = (0 if "r" in mode else 1)
with (os.fdopen(fd, mode, closefd=False) if path == "-" else open(path, mode)) as file:
yield file
if "w" in mode:
file.flush()
class _Edid:
# https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
def __init__(self, path: str) -> None:
with _smart_open(path, "rb") as file:
data = file.read()
if data.startswith(b"\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00"):
self.__data = list(data)
else:
text = re.sub(r"\s", "", data.decode())
self.__data = [
int(text[index:index + 2], 16)
for index in range(0, len(text), 2)
]
assert len(self.__data) == 256, f"Invalid EDID length: {len(self.__data)}, should be 256 bytes"
assert self.__data[126] == 1, "Zero extensions number"
assert (self.__data[128], self.__data[129]) == (0x02, 0x03), "Can't find CEA-861"
# =====
def write_hex(self, path: str) -> None:
self.__update_checksums()
text = "\n".join(
"".join(
f"{item:0{2}X}"
for item in self.__data[index:index + 16]
)
for index in range(0, len(self.__data), 16)
) + "\n"
with _smart_open(path, "w") as file:
file.write(text)
def write_bin(self, path: str) -> None:
self.__update_checksums()
with _smart_open(path, "wb") as file:
file.write(bytes(self.__data))
def __update_checksums(self) -> None:
self.__data[127] = 256 - (sum(self.__data[:127]) % 256)
self.__data[255] = 256 - (sum(self.__data[128:255]) % 256)
# =====
def get_mfc_id(self) -> str:
raw = self.__data[8] << 8 | self.__data[9]
return bytes([
((raw >> 10) & 0b11111) + 0x40,
((raw >> 5) & 0b11111) + 0x40,
(raw & 0b11111) + 0x40,
]).decode("ascii")
def set_mfc_id(self, mfc_id: str) -> None:
assert len(mfc_id) == 3, "Mfc ID must be 3 characters long"
data = mfc_id.upper().encode("ascii")
for byte in data:
assert 0x41 <= byte <= 0x5A, "Mfc ID must contain only A-Z characters"
raw = (
(data[2] - 0x40)
| ((data[1] - 0x40) << 5)
| ((data[0] - 0x40) << 10)
)
self.__data[8] = (raw >> 8) & 0xFF
self.__data[9] = raw & 0xFF
# =====
def get_product_id(self) -> int:
return (self.__data[10] | self.__data[11] << 8)
def set_product_id(self, product_id: int) -> None:
assert 0 <= product_id <= 0xFFFF, f"Product ID should be from 0 to {0xFFFF}"
self.__data[10] = product_id & 0xFF
self.__data[11] = (product_id >> 8) & 0xFF
# =====
def get_serial(self) -> int:
return (
self.__data[12]
| self.__data[13] << 8
| self.__data[14] << 16
| self.__data[15] << 24
)
def set_serial(self, serial: int) -> None:
assert 0 <= serial <= 0xFFFFFFFF, f"Serial should be from 0 to {0xFFFFFFFF}"
self.__data[12] = serial & 0xFF
self.__data[13] = (serial >> 8) & 0xFF
self.__data[14] = (serial >> 16) & 0xFF
self.__data[15] = (serial >> 24) & 0xFF
# =====
def get_monitor_name(self) -> str:
index = self.__find_mnd_text()
return bytes(self.__data[index:index + 13]).decode("cp437").strip()
def set_monitor_name(self, name: str) -> None:
index = self.__find_mnd_text()
encoded = (name[:13] + "\n" + " " * 12)[:13].encode("cp437")
for (offset, byte) in enumerate(encoded):
self.__data[index + offset] = byte
def __find_mnd_text(self) -> int:
for index in [54, 72, 90, 108]:
if self.__data[index + 3] == 0xFC:
return index + 5
raise AssertionError("Can't find DTD Monitor name")
# =====
def get_audio(self) -> bool:
return bool(self.__data[131] & 0b01000000)
def set_audio(self, enabled: bool) -> None:
if enabled:
self.__data[131] |= 0b01000000
else:
self.__data[131] &= (0xFF - 0b01000000) # ~X
def _format_bool(value: bool) -> str:
return ("yes" if value else "no")
def _make_format_hex(size: int) -> Callable[[int], str]:
return (lambda value: ("0x{:0%dX} ({})" % (size * 2)).format(value, value))
# =====
def main(argv: (list[str] | None)=None) -> None: # pylint: disable=too-many-branches
# (parent_parser, argv, _) = init(
# add_help=False,
# argv=argv,
# )
if argv is None:
argv = sys.argv
parser = argparse.ArgumentParser(
prog="kvmd-edidconf",
description="A simple and primitive KVMD EDID editor",
# parents=[parent_parser],
)
parser.add_argument("-f", "--edid", dest="edid_path", default="/etc/kvmd/tc358743-edid.hex",
help="The hex/bin EDID file path", metavar="<file>")
parser.add_argument("--export-hex",
help="Export [--edid] file to the new file as a hex text", metavar="<file>")
parser.add_argument("--export-bin",
help="Export [--edid] file to the new file as a bin data", metavar="<file>")
parser.add_argument("--import", dest="imp",
help="Import the specified bin/hex EDID to the [--edid] file as a hex text", metavar="<file>")
parser.add_argument("--set-audio", type=valid_bool,
help="Enable or disable basic audio", metavar="<yes|no>")
parser.add_argument("--set-mfc-id",
help="Set manufacturer ID (https://uefi.org/pnp_id_list)", metavar="<ABC>")
parser.add_argument("--set-product-id", type=valid_int_f0,
help="Set product ID (decimal)", metavar="<uint>")
parser.add_argument("--set-serial", type=valid_int_f0,
help="Set serial number (decimal)", metavar="<uint>")
parser.add_argument("--set-monitor-name",
help="Set monitor name in DTD/MND (ASCII, max 13 characters)", metavar="<str>")
parser.add_argument("--clear", action="store_true",
help="Clear the EDID in the [--device]")
parser.add_argument("--apply", action="store_true",
help="Apply [--edid] on the [--device]")
parser.add_argument("--device", dest="device_path", default="/dev/kvmd-video",
help="The video device", metavar="<device>")
options = parser.parse_args(argv[1:])
if options.imp:
options.export_hex = options.edid_path
options.edid_path = options.imp
edid = _Edid(options.edid_path)
changed = False
for cmd in dir(_Edid):
if cmd.startswith("set_"):
value = getattr(options, cmd)
if value is not None:
getattr(edid, cmd)(value)
changed = True
if options.export_hex is not None:
edid.write_hex(options.export_hex)
elif options.export_bin is not None:
edid.write_bin(options.export_bin)
elif changed:
edid.write_hex(options.edid_path)
for (key, get, fmt) in [
("Manufacturer ID:", edid.get_mfc_id, str),
("Product ID: ", edid.get_product_id, _make_format_hex(2)),
("Serial number: ", edid.get_serial, _make_format_hex(4)),
("Monitor name: ", edid.get_monitor_name, str),
("Basic audio: ", edid.get_audio, _format_bool),
]:
print(key, fmt(get()), file=sys.stderr) # type: ignore
try:
if options.clear:
subprocess.run([
"/usr/bin/v4l2-ctl",
f"--device={options.device_path}",
"--clear-edid",
], stdout=sys.stderr, check=True)
if options.apply:
time.sleep(1)
if options.apply:
subprocess.run([
"/usr/bin/v4l2-ctl",
f"--device={options.device_path}",
f"--set-edid=file={options.edid_path}",
"--fix-edid-checksums",
"--info-edid",
], stdout=sys.stderr, check=True)
except subprocess.CalledProcessError as err:
raise SystemExit(str(err))
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