device: use FRIENDLY NAME for codename if needed and available

lib/logitech_receiver/device.py

@@ -195,16 +195,17 @@ class Device(object):
     @property
     def codename(self):
         if not self._codename:
-            codename = self.receiver.read_register(_R.receiver_info, 0x40 + self.number - 1) if self.receiver else None
+            if self.online and self.protocol >= 2.0:
+                self._codename = _hidpp20.get_friendly_name(self)
+            elif self.receiver:
+                codename = self.receiver.read_register(_R.receiver_info, 0x40 + self.number - 1)
                 if codename:
                     codename_length = ord(codename[1:2])
                     codename = codename[2:2 + codename_length]
-                self._codename = codename.decode('ascii')
-                # if _log.isEnabledFor(_DEBUG):
-                #     _log.debug("device %d codename %s", self.number, self._codename)
-            else:
+                    self._codename = codename.decode('utf-8')
+                elif self.protocol < 2.0:
                     self._codename = '? (%s)' % (self.wpid or self.product_id)
-        return self._codename
+        return self._codename if self._codename else '?? (%s)' % (self.wpid or self.product_id)
 
     @property
     def name(self):

lib/logitech_receiver/hidpp20.py

@@ -1100,7 +1100,30 @@ def get_name(device):
                 _log.error('failed to read whole name of %s (expected %d chars)', device, name_length)
                 return None
 
-        return name.decode('ascii')
+        return name.decode('utf-8')
+
+
+def get_friendly_name(device):
+    """Reads a device's friendly name.
+
+    :returns: a string with the device name, or ``None`` if the device is not
+    available or does not support the ``DEVICE_NAME`` feature.
+    """
+    name_length = feature_request(device, FEATURE.DEVICE_FRIENDLY_NAME)
+    if name_length:
+        name_length = ord(name_length[:1])
+
+        name = b''
+        while len(name) < name_length:
+            fragment = feature_request(device, FEATURE.DEVICE_FRIENDLY_NAME, 0x10, len(name))
+            if fragment:
+                initial_null = 0 if fragment[0] else 1  # initial null actually seen on a device
+                name += fragment[initial_null:name_length + initial_null - len(name)]
+            else:
+                _log.error('failed to read whole name of %s (expected %d chars)', device, name_length)
+                return None
+
+        return name.decode('utf-8')
 
 
 def get_battery(device):

lib/solaar/ui/window.py

@@ -460,10 +460,9 @@ def _device_row(receiver_path, device_number, device=None):
         icon_name = _icons.device_icon_name(device.name, device.kind)
         status_text = None
         status_icon = None
-        codename = device.codename if device.codename and device.codename[0] != '?' else (
-            device.name.split()[0] if device.name.split() else device.codename
+        row_data = (
+            receiver_path, device_number, bool(device.online), device.codename, icon_name, status_text, status_icon, device
         )
-        row_data = (receiver_path, device_number, bool(device.online), codename, icon_name, status_text, status_icon, device)
         assert len(row_data) == len(_TREE_SEPATATOR)
         if _log.isEnabledFor(_DEBUG):
             _log.debug('new device row %s at index %d', row_data, new_child_index)