settings: add BACKLIGHT3 setting template

lib/logitech_receiver/settings.py

@@ -687,15 +687,12 @@ class RegisterRW:
 
 
 class FeatureRW:
-    __slots__ = ('feature', 'read_fnid', 'write_fnid', 'prefix', 'no_reply')
-
     kind = _NamedInt(0x02, _('feature'))
     default_read_fnid = 0x00
     default_write_fnid = 0x10
-    default_prefix = b''
 
     def __init__(
-        self, feature, read_fnid=default_read_fnid, write_fnid=default_write_fnid, prefix=default_prefix, no_reply=False
+        self, feature, read_fnid=default_read_fnid, write_fnid=default_write_fnid, prefix=b'', suffix=b'', no_reply=False
     ):
         assert isinstance(feature, _NamedInt)
         self.feature = feature
@@ -703,6 +700,7 @@ class FeatureRW:
         self.write_fnid = write_fnid
         self.no_reply = no_reply
         self.prefix = prefix
+        self.suffix = suffix
 
     def read(self, device, data_bytes=b''):
         assert self.feature is not None
@@ -710,7 +708,9 @@ class FeatureRW:
 
     def write(self, device, data_bytes):
         assert self.feature is not None
-        reply = device.feature_request(self.feature, self.write_fnid, self.prefix, data_bytes, no_reply=self.no_reply)
+        reply = device.feature_request(
+            self.feature, self.write_fnid, self.prefix, data_bytes, self.suffix, no_reply=self.no_reply
+        )
         return reply if not self.no_reply else True
 
 

lib/logitech_receiver/settings_templates.py

@@ -197,24 +197,33 @@ class K375sFnSwap(FnSwapVirtual):
     validator_options = {'true_value': b'\x01', 'false_value': b'\x00', 'read_skip_byte_count': 1}
 
 
-class BacklightVirtual(_Setting):
-    label = _('Backlight')
-    description = _('Turn illumination on or off on keyboard.')
-
-
-class Backlight(BacklightVirtual):
-    name = 'backlight-timed'
+class Backlight(_Setting):
+    name = 'backlight-qualitative'
+    description = _('Set illumination time for keyboard.')
     feature = _F.BACKLIGHT
     choices_universe = _NamedInts(Off=0, Short=5, Medium=20, Long=60, VeryLong=180)
     validator_class = _ChoicesV
     validator_options = {'choices': choices_universe}
 
 
-class Backlight2(BacklightVirtual):
+class Backlight2(_Setting):
+    label = _('Backlight')
+    description = _('Turn illumination on or off on keyboard.')
     name = 'backlight'
     feature = _F.BACKLIGHT2
 
 
+class Backlight3(_Setting):
+    name = 'backlight-timed'
+    description = _('Set illumination time for keyboard.')
+    feature = _F.BACKLIGHT3
+    rw_options = {'read_fnid': 0x10, 'write_fnid': 0x20, 'suffix': 0x09}
+    validator_class = _RangeV
+    min_value = 0
+    max_value = 1000
+    validator_options = {'byte_count': 2}
+
+
 class HiResScroll(_Setting):
     name = 'hi-res-scroll'
     label = _('Scroll Wheel High Resolution')
@@ -1057,6 +1066,7 @@ SETTINGS = [
     MouseGesture,  # working
     Backlight,
     Backlight2,  # working
+    Backlight3,
     FnSwap,  # simple
     NewFnSwap,  # simple
     K375sFnSwap,  # working