linux-kernel - [RFC PATCH 2/2] hid: lenovo: move type checks to lenovo_features_set

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Date:   Mon, 25 Sep 2023 10:23:02 +0000
From:   Martin Kepplinger <martink@...teo.de>
To:     jikos@...nel.org, benjamin.tissoires@...hat.com, jm@...tin.co.uk,
        linux-kernel@...r.kernel.org
Cc:     linux-input@...r.kernel.org, Martin Kepplinger <martink@...teo.de>
Subject: [RFC PATCH 2/2] hid: lenovo: move type checks to lenovo_features_set_cptkbd()

These custom commands will be sent to both the USB keyboard & mouse
devices but only the mouse will respond. Avoid sending known-useless
messages by always prepending the filter before sending them.

Suggested-by: Jamie Lentin <jm@...tin.co.uk>
Signed-off-by: Martin Kepplinger <martink@...teo.de>
---
 drivers/hid/hid-lenovo.c | 27 +++++++++------------------
 1 file changed, 9 insertions(+), 18 deletions(-)

diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index 29aa6d372bad..922f3e5462f4 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -521,6 +521,14 @@ static void lenovo_features_set_cptkbd(struct hid_device *hdev)
 	int ret;
 	struct lenovo_drvdata *cptkbd_data = hid_get_drvdata(hdev);
 
+	/* All the custom action happens on the USBMOUSE device for USB */
+	if (((hdev->product == USB_DEVICE_ID_LENOVO_CUSBKBD) ||
+	    (hdev->product == USB_DEVICE_ID_LENOVO_TPIIUSBKBD)) &&
+	    hdev->type != HID_TYPE_USBMOUSE) {
+		hid_dbg(hdev, "Ignoring keyboard half of device\n");
+		return;
+	}
+
 	/*
 	 * Tell the keyboard a driver understands it, and turn F7, F9, F11 into
 	 * regular keys
@@ -1122,14 +1130,6 @@ static int lenovo_probe_cptkbd(struct hid_device *hdev)
 	int ret;
 	struct lenovo_drvdata *cptkbd_data;
 
-	/* All the custom action happens on the USBMOUSE device for USB */
-	if (((hdev->product == USB_DEVICE_ID_LENOVO_CUSBKBD) ||
-	    (hdev->product == USB_DEVICE_ID_LENOVO_TPIIUSBKBD)) &&
-	    hdev->type != HID_TYPE_USBMOUSE) {
-		hid_dbg(hdev, "Ignoring keyboard half of device\n");
-		return 0;
-	}
-
 	cptkbd_data = devm_kzalloc(&hdev->dev,
 					sizeof(*cptkbd_data),
 					GFP_KERNEL);
@@ -1264,16 +1264,7 @@ static int lenovo_probe(struct hid_device *hdev,
 #ifdef CONFIG_PM
 static int lenovo_reset_resume(struct hid_device *hdev)
 {
-	switch (hdev->product) {
-	case USB_DEVICE_ID_LENOVO_CUSBKBD:
-		if (hdev->type == HID_TYPE_USBMOUSE) {
-			lenovo_features_set_cptkbd(hdev);
-		}
-
-		break;
-	default:
-		break;
-	}
+	lenovo_features_set_cptkbd(hdev);
 
 	return 0;
 }
-- 
2.39.2