Add support for out-of-spec InputSource.

monitorcontrol/monitorcontrol.py

@@ -46,6 +46,21 @@ class InputSource(enum.Enum):
     HDMI2 = 0x12
 
 
+class InputSourceValueError(ValueError):
+    """
+    Raised upon an invalid (out of spec) input source value.
+
+    https://github.com/newAM/monitorcontrol/issues/93
+
+    Attributes:
+        value (int): The value of the input source that was invalid.
+    """
+
+    def __init__(self, message: str, value: int):
+        super().__init__(message)
+        self.value = value
+
+
 class Monitor:
     """
     A physical monitor attached to a Virtual Control Panel (VCP).
@@ -354,12 +369,30 @@ def get_input_source(self) -> InputSource:
                     with monitor:
                         print(monitor.get_input_source())
 
+            Handling out-of-spec inputs (observed for USB type-C inputs)::
+
+                from monitorcontrol import get_monitors, InputSourceValueError
+
+                for monitor in get_monitors():
+                    with monitor:
+                        try:
+                            print(monitor.get_input_source())
+                        except InputSourceValueError as e:
+                            print(e.value)
+
         Raises:
             VCPError: Failed to get input source from the VCP.
+            InputSourceValueError:
+                Input source value is not within the MCCS defined inputs.
         """
         code = vcp.VCPCode("input_select")
         value = self._get_vcp_feature(code) & 0xFF
-        return InputSource(value)
+        try:
+            return InputSource(value)
+        except ValueError:
+            raise InputSourceValueError(
+                f"{value} is not a valid InputSource", value
+            )
 
     def set_input_source(self, value: Union[int, str, InputSource]):
         """
@@ -385,7 +418,7 @@ def set_input_source(self, value: Union[int, str, InputSource]):
         if isinstance(value, str):
             mode_value = getattr(InputSource, value.upper()).value
         elif isinstance(value, int):
-            mode_value = InputSource(value).value
+            mode_value = value
         elif isinstance(value, InputSource):
             mode_value = value.value
         else: