Add initial DMS signals

This adds basic support for Driver Monitoring Systems (DMS) to the
ADAS spec. These have been derived from the other ADAS features and
presently include:

- DMS.IsEnabled to determine if the system has been enabled or not
- DMS.IsWarning to determine if the system is in an alert state
- DMS.IsError to determine if the system is in an error state

The DMS.IsEnabled signal can be used to determine whether driver
monitoring signals under Driver are expected to be valid, while
the DMS.IsWarning signal can be used as a bassis for interrogating
the cause of a specific alert condition from the Driver state.

Signed-off-by: Paul Mundt <[email protected]>

spec/ADAS/ADAS.vspec

@@ -285,4 +285,26 @@ EBA.IsEngaged:
   type: sensor
   description: Indicates if EBA is currently regulating brake pressure. True = Engaged. False = Not Engaged.
 
+#
+# Driver Monitoring System (DMS)
+#
+DMS:
+  type: branch
+  description: Driver Monitoring System signals.
+
+DMS.IsEnabled:
+  datatype: boolean
+  type: actuator
+  description: Indicates if DMS is enabled. True = Enabled. False = Disabled.
+
+DMS.IsWarning:
+  datatype: boolean
+  type: sensor
+  description: Indicates if DMS has registered a driver alert condition.
+
+DMS.IsError:
+  datatype: boolean
+  type: sensor
+  description: Indicates if DMS incurred an error condition. True = Error. False = No Error.
+
 #include include/PowerOptimize.vspec