HID: logitech-hidpp: Add hidpp_non_unifying_init() helper

Turn hidpp_overwrite_name() into a hidpp_non_unifying_init() helper
which takes care of setting both the name and the serial for non
unifying devices.

This mirrors the hidpp_unifying_init() helper for unifying devices.

This series has been tested on the following devices:
Logitech Bluetooth Laser Travel Mouse (bluetooth, HID++ 1.0)
Logitech M720 Triathlon (bluetooth, HID++ 4.5)
Logitech M720 Triathlon (unifying, HID++ 4.5)
Logitech K400 Pro (unifying, HID++ 4.1)
Logitech K270 (eQUAD nano Lite, HID++ 2.0)
Logitech M185 (eQUAD nano Lite, HID++ 4.5)
Logitech LX501 keyboard (27 Mhz, HID++ builtin scroll-wheel, HID++ 1.0)
Logitech M-RAZ105 mouse (27 Mhz, HID++ extra mouse buttons, HID++ 1.0)

And by bentiss:
Logitech Touchpad T650 (unifying)
Logitech Touchpad T651 (bluetooth)
Logitech MX Master 3B (BLE)
Logitech G403 (plain USB / Gaming receiver)

Signed-off-by: Hans de Goede <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Benjamin Tissoires <[email protected]>

Author: jwrdegoede

drivers/hid/hid-logitech-hidpp.c

@@ -4130,11 +4130,16 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
 	return ret;
 }
 
-static void hidpp_overwrite_name(struct hid_device *hdev)
+/* Get name + serial for USB and Bluetooth HID++ devices */
+static void hidpp_non_unifying_init(struct hidpp_device *hidpp)
 {
-	struct hidpp_device *hidpp = hid_get_drvdata(hdev);
+	struct hid_device *hdev = hidpp->hid_dev;
 	char *name;
 
+	/* Bluetooth devices already have their serialnr set */
+	if (hid_is_usb(hdev))
+		hidpp_serial_init(hidpp);
+
 	name = hidpp_get_device_name(hidpp);
 	if (name) {
 		dbg_hid("HID++: Got name: %s\n", name);
@@ -4474,14 +4479,11 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	/* Allow incoming packets */
 	hid_device_io_start(hdev);
 
+	/* Get name + serial, store in hdev->name + hdev->uniq */
 	if (hidpp->quirks & HIDPP_QUIRK_UNIFYING)
 		hidpp_unifying_init(hidpp);
-	else {
-		if (hid_is_usb(hidpp->hid_dev))
-			hidpp_serial_init(hidpp);
-
-		hidpp_overwrite_name(hdev);
-	}
+	else
+		hidpp_non_unifying_init(hidpp);
 
 	connected = hidpp_root_get_protocol_version(hidpp) == 0;
 	atomic_set(&hidpp->connected, connected);