edidconf

2 files changed, 136 insertions, 0 deletions

diff --git a/kvmd/apps/edidconf/__init__.py b/kvmd/apps/edidconf/__init__.py
new file mode 100644
index 00000000..baf2ed43
--- /dev/null
+++ b/kvmd/apps/edidconf/__init__.py
@@ -0,0 +1,112 @@
+# ========================================================================== #
+#                                                                            #
+#    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 sys
+import re
+import argparse
+
+from typing import List
+from typing import Optional
+
+from ...validators.basic import valid_bool
+
+from .. import init
+
+
+# =====
+class _Edid:
+    def __init__(self, path: str) -> None:
+        with open(path) as file:
+            self.__load_from_hex(file.read())
+
+    def write(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)
+        )
+        if path:
+            with open(path, "w") as file:
+                file.write(text + "\n")
+        else:
+            print(text)
+
+    def is_audio_enabled(self) -> bool:
+        return bool(self.__data[131] & 0b01000000)
+
+    def set_audio_enabled(self, enabled: bool) -> None:
+        if enabled:
+            self.__data[131] |= 0b01000000
+        else:
+            self.__data[131] &= (0xFF - 0b01000000)  # ~X
+
+    def __load_from_hex(self, text: str) -> None:
+        text = re.sub(r"\s", "", text)
+        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 __update_checksums(self) -> None:
+        self.__data[127] = 256 - (sum(self.__data[:127]) % 256)
+        self.__data[255] = 256 - (sum(self.__data[128:255]) % 256)
+
+
+# =====
+def main(argv: Optional[List[str]]=None) -> None:
+    (parent_parser, argv, _) = init(
+        add_help=False,
+        argv=argv,
+    )
+    parser = argparse.ArgumentParser(
+        prog="kvmd-edidconf",
+        description="A simple and primitive KVMD EDID editor",
+        parents=[parent_parser],
+    )
+    parser.add_argument("-f", "--edid-file", dest="path", default="/etc/kvmd/tc358743-edid.hex",
+                        help="EDID hex text file path", metavar="<file>")
+    parser.add_argument("--stdout", action="store_true",
+                        help="Write to stdout instead of the rewriting the source file")
+    parser.add_argument("--set-audio", type=valid_bool, dest="set_audio", default=None,
+                        help="Enable or disable basic audio", metavar="<yes|no>")
+    parser.add_argument("--show-info", action="store_true",
+                        help="Write summary info to stderr")
+    options = parser.parse_args(argv[1:])
+
+    edid = _Edid(options.path)
+    changed = False
+
+    if options.set_audio is not None:
+        edid.set_audio_enabled(options.set_audio)
+        changed = True
+
+    if changed:
+        edid.write("" if options.stdout else options.path)
+
+    if options.show_info:
+        print(f"Audio: {'yes' if edid.is_audio_enabled() else 'no'}", file=sys.stderr)
diff --git a/kvmd/apps/edidconf/__main__.py b/kvmd/apps/edidconf/__main__.py
new file mode 100644
index 00000000..3849d1b9
--- /dev/null
+++ b/kvmd/apps/edidconf/__main__.py
@@ -0,0 +1,24 @@
+# ========================================================================== #
+#                                                                            #
+#    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/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+from . import main
+main()