allow short edids, import full edid on with kvmd-edidconf

kvmd/apps/edidconf/__init__.py

@@ -61,23 +61,17 @@ def _print_edid(edid: Edid) -> None:
             pass
 
 
-def _read_out2_edid() -> (Edid | None):
+def _find_out2_edid_path() -> str:
     card = os.path.basename(os.readlink("/dev/dri/by-path/platform-gpu-card"))
     path = f"/sys/devices/platform/gpu/drm/{card}/{card}-HDMI-A-2"
     with open(os.path.join(path, "status")) as file:
         if file.read().startswith("d"):
-            return None
+            raise SystemExit("No display found")
-    with open(os.path.join(path, "edid"), "rb") as file:
+    return os.path.join(path, "edid")
-        data = file.read()
-        if len(data) == 0:
-            return None
-    return Edid.from_file(os.path.join(path, "edid"), allow_short=True)
 
 
 def _adopt_out2_ids(dest: Edid) -> None:
-    src = _read_out2_edid()
+    src = Edid.from_file(_find_out2_edid_path())
-    if src is None:
-        raise SystemExit("No display found")
     dest.set_monitor_name(src.get_monitor_name())
     try:
         dest.get_monitor_serial()
@@ -123,7 +117,9 @@ def main(argv: (list[str] | None)=None) -> None:  # pylint: disable=too-many-bra
     parser.add_argument("--import-preset", choices=presets,
                         help="Restore default EDID or choose the preset", metavar=f"{{ {' | '.join(presets)} }}",)
     parser.add_argument("--import-display-ids", action="store_true",
-                        help="On PiKVM V4, import and adopt IDs from physical display connected to OUT2")
+                        help="On PiKVM V4, import and adopt IDs from a physical display connected to the OUT2 port")
+    parser.add_argument("--import-display", action="store_true",
+                        help="On PiKVM V4, import full EDID from a physical display connected to the OUT2 port")
     parser.add_argument("--set-audio", type=valid_bool,
                         help="Enable or disable audio", metavar="<yes|no>")
     parser.add_argument("--set-mfc-id",
@@ -155,6 +151,9 @@ def main(argv: (list[str] | None)=None) -> None:  # pylint: disable=too-many-bra
             imp = f"_{imp}"
         options.imp = os.path.join(options.presets_path, f"{imp}.hex")
 
+    if options.import_display:
+        options.imp = _find_out2_edid_path()
+
     orig_edid_path = options.edid_path
     if options.imp:
         options.export_hex = options.edid_path

kvmd/apps/kvmd/switch/types.py

@@ -59,13 +59,19 @@ class EdidInfo:
         except ParsedEdidNoBlockError:
             pass
 
+        audio: bool = False
+        try:
+            audio = parsed.get_audio()
+        except ParsedEdidNoBlockError:
+            pass
+
         return EdidInfo(
             mfc_id=parsed.get_mfc_id(),
             product_id=parsed.get_product_id(),
             serial=parsed.get_serial(),
             monitor_name=monitor_name,
             monitor_serial=monitor_serial,
-            audio=parsed.get_audio(),
+            audio=audio,
         )
 
 
@@ -76,14 +82,14 @@ class Edid:
     crc:      int = dataclasses.field(default=0)
     valid:    bool = dataclasses.field(default=False)
     info:     (EdidInfo | None) = dataclasses.field(default=None)
-
+    _packed:  bytes = dataclasses.field(default=b"")
-    __HEADER = b"\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00"
 
     def __post_init__(self) -> None:
         assert len(self.name) > 0
-        assert len(self.data) == 256
+        assert len(self.data) in [128, 256]
-        object.__setattr__(self, "crc", bitbang.make_crc16(self.data))
+        object.__setattr__(self, "_packed", (self.data + (b"\x00" * 128))[:256])
-        object.__setattr__(self, "valid", self.data.startswith(self.__HEADER))
+        object.__setattr__(self, "crc", bitbang.make_crc16(self._packed))  # Calculate CRC for filled data
+        object.__setattr__(self, "valid", ParsedEdid.is_header_valid(self.data))
         try:
             object.__setattr__(self, "info", EdidInfo.from_data(self.data))
         except Exception:
@@ -93,7 +99,7 @@ class Edid:
         return "".join(f"{item:0{2}X}" for item in self.data)
 
     def pack(self) -> bytes:
-        return self.data
+        return self._packed
 
     @classmethod
     def from_data(cls, name: str, data: (str | bytes | None)) -> "Edid":
@@ -101,14 +107,14 @@ class Edid:
             return Edid(name, b"\x00" * 256)
 
         if isinstance(data, bytes):
-            if data.startswith(cls.__HEADER):
+            if ParsedEdid.is_header_valid(cls.data):
                 return Edid(name, data)  # Бинарный едид
             data_hex = data.decode()  # Текстовый едид, прочитанный как бинарный из файла
         else:  # isinstance(data, str)
             data_hex = str(data)  # Текстовый едид
 
         data_hex = re.sub(r"\s", "", data_hex)
-        assert len(data_hex) == 512
+        assert len(data_hex) in [256, 512]
         data = bytes([
             int(data_hex[index:index + 2], 16)
             for index in range(0, len(data_hex), 2)

kvmd/edid.py

@@ -80,27 +80,29 @@ _CEA_SPEAKERS = 4
 class Edid:
     # https://en.wikipedia.org/wiki/Extended_Display_Identification_Data
 
-    def __init__(self, data: bytes, allow_short: bool=False) -> None:
+    def __init__(self, data: bytes) -> None:
-        if allow_short:
         assert len(data) in [_SHORT, _LONG], f"Invalid EDID length: {len(data)}, should be {_SHORT} or {_LONG} bytes"
-        else:
+        self.__long = (len(data) == _LONG)
-            assert len(data) == _LONG, f"Invalid EDID length: {len(data)}, should be {_LONG} bytes"
+        if self.__long:
             assert data[126] == 1, "Zero extensions number"
             assert (data[_CEA + 0], data[_CEA + 1]) == (0x02, 0x03), "Can't find CEA extension"
         self.__data = list(data)
-        self.__long = (len(data) == _LONG)
 
     @classmethod
-    def from_file(cls, path: str, allow_short: bool=False) -> "Edid":
+    def is_header_valid(cls, data: bytes) -> bool:
+        return data.startswith(b"\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00")
+
+    @classmethod
+    def from_file(cls, path: str) -> "Edid":
         with _smart_open(path, "rb") as file:
             data = file.read()
-            if not data.startswith(b"\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00"):
+            if not cls.is_header_valid(data):
                 text = re.sub(r"\s", "", data.decode())
                 data = bytes([
                     int(text[index:index + 2], 16)
                     for index in range(0, len(text), 2)
                 ])
-        return Edid(data, allow_short)
+        return Edid(data)
 
     def write_hex(self, path: str) -> None:
         self.__update_checksums()
@@ -236,7 +238,8 @@ class Edid:
             self.__data[_CEA + 3] &= (0xFF - 0b01000000)  # ~X
 
     def __parse_cea(self) -> tuple[list[_CeaBlock], bytes]:
-        assert self.__long, "This EDID does not contain any CEA blocks"
+        if not self.__long:
+            raise EdidNoBlockError("This EDID does not contain any CEA blocks")
 
         cea = self.__data[_CEA:]
         dtd_begin = cea[2]

kvmd/validators/switch.py

@@ -50,7 +50,7 @@ def valid_switch_edid_data(arg: Any) -> str:
     name = "switch EDID data"
     arg = valid_stripped_string(arg, name=name)
     arg = re.sub(r"\s", "", arg)
-    return check_re_match(arg, name, "(?i)^[0-9a-f]{512}$").upper()
+    return check_re_match(arg, name, "(?i)^([0-9a-f]{256}|[0-9a-f]{512})$").upper()
 
 
 def valid_switch_color(arg: Any, allow_default: bool) -> str:

testenv/tests/validators/test_switch.py

@@ -94,6 +94,9 @@ def test_fail__valid_switch_edid_id__allowed_default(arg: Any) -> None:
 
 # =====
 @pytest.mark.parametrize("arg", [
+    "f" * 256,
+    "0" * 256,
+    "1a" * 128,
     "f" * 512,
     "0" * 512,
     "1a" * 256,