feat(interface/desk_control): add desk control interface

shard.yml

@@ -1,5 +1,5 @@
 name: placeos-driver
-version: 7.0.0
+version: 7.1.0
 crystal: ">= 1.0.0"
 
 dependencies:

src/placeos-driver/interface/desk_control.cr

@@ -0,0 +1,21 @@
+abstract class PlaceOS::Driver
+  # Common desk control interface
+  module Interface::DeskControl
+    # desk height is in mm
+    abstract def set_desk_height(
+      desk_key : String,
+      desk_height : Int32? = nil
+    )
+
+    # return nil on unknown height
+    abstract def get_desk_height(desk_key : String) : Int32?
+
+    # desk_power on / off / nil == auto
+    abstract def set_desk_power(
+      desk_key : String,
+      desk_power : Bool?
+    )
+
+    abstract def get_desk_power(desk_key : String) : Bool?
+  end
+end