hidpp20: features: add very basic implementation of 0x1982 (Backlight 2)

Fixes #547

lib/logitech_receiver/descriptors.py

@@ -220,11 +220,7 @@ _D('Illuminated Living-Room Keyboard K830', protocol=2.0, wpid='4032',
 							_FS.new_fn_swap()
 						],
 				)
-_D('Craft Advanced Keyboard', protocol=4.5, wpid='4066',
+_D('Craft Advanced Keyboard', protocol=4.5, wpid='4066')
-				settings=[
-							_FS.new_fn_swap()
-						],
-				)
 
 
 # Mice

lib/logitech_receiver/hidpp20.py

@@ -60,6 +60,7 @@ FEATURE = _NamedInts(
 	LED_CONTROL=0x1300,
 	CHANGE_HOST=0x1814,
 	BACKLIGHT=0x1981,
+	BACKLIGHT2=0x1982,
 	REPROG_CONTROLS=0x1B00,
 	REPROG_CONTROLS_V2=0x1B01,
 	REPROG_CONTROLS_V2_2=0x1B02, # LogiOptions 2.10.73 features.xml

lib/logitech_receiver/settings_templates.py

@@ -140,6 +140,9 @@ _FN_SWAP = ('fn-swap', _("Swap Fx function"),
 						 	"and you must hold the FN key to activate their special function."))
 _HAND_DETECTION = ('hand-detection', _("Hand Detection"),
 							_("Turn on illumination when the hands hover over the keyboard."))
+_BACKLIGHT = ('backlight', _("Backlight"),
+				   _("Turn illumination on or off on keyboard."))
+
 _SMART_SHIFT = ('smart-shift', _("Smart Shift"),
 							_("Automatically switch the mouse wheel between ratchet and freespin mode.\n"
 							"The mouse wheel is always free at 0, and always locked at 50"))
@@ -189,6 +192,12 @@ def _feature_k375s_fn_swap():
 					label=_FN_SWAP[1], description=_FN_SWAP[2],
 					device_kind=(_DK.keyboard,))
 
+# FIXME: This will enable all supported backlight settings, we should allow the users to select which settings they want to enable.
+def _feature_backlight2():
+	return feature_toggle(_BACKLIGHT[0], _F.BACKLIGHT2,
+						  label=_BACKLIGHT[1], description=_BACKLIGHT[2],
+						  device_kind=(_DK.keyboard,))
+
 def _feature_hi_res_scroll():
 	return feature_toggle(_HI_RES_SCROLL[0], _F.HI_RES_SCROLLING,
 					label=_HI_RES_SCROLL[1], description=_HI_RES_SCROLL[2],
@@ -312,6 +321,7 @@ _SETTINGS_LIST = namedtuple('_SETTINGS_LIST', [
 					'dpi',
 					'pointer_speed',
 					'hand_detection',
+					'backlight',
 					'typing_illumination',
 					'smart_shift',
 					])
@@ -330,6 +340,7 @@ RegisterSettings = _SETTINGS_LIST(
 				dpi=_register_dpi,
 				pointer_speed=None,
 				hand_detection=_register_hand_detection,
+				backlight=None,
 				typing_illumination=None,
 				smart_shift=None,
 			)
@@ -346,6 +357,7 @@ FeatureSettings =  _SETTINGS_LIST(
 				dpi=_feature_adjustable_dpi,
 				pointer_speed=_feature_pointer_speed,
 				hand_detection=None,
+				backlight=_feature_backlight2,
 				typing_illumination=None,
 				smart_shift=_feature_smart_shift,
 			)
@@ -391,3 +403,4 @@ def check_feature_settings(device, already_known):
 	check_feature(_DPI[0],           _F.ADJUSTABLE_DPI)
 	check_feature(_POINTER_SPEED[0], _F.POINTER_SPEED)
 	check_feature(_SMART_SHIFT[0],   _F.SMART_SHIFT)
+	check_feature(_BACKLIGHT[0],   	 _F.BACKLIGHT2)