From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F26F7C433FE for ; Mon, 7 Mar 2022 09:30:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237210AbiCGJa7 (ORCPT ); Mon, 7 Mar 2022 04:30:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36326 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237069AbiCGJ1P (ORCPT ); Mon, 7 Mar 2022 04:27:15 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D628966C82; Mon, 7 Mar 2022 01:24:43 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4797E61141; Mon, 7 Mar 2022 09:24:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 50A4FC340E9; Mon, 7 Mar 2022 09:24:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1646645074; bh=TXqZ+EChSCl0LpdGhIFv0gP/aMj5q1dIexiP5V1RYC0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dz/9B8m7rK4zzQLljQVvL0bucLe65N4pvbYtuDxTaJPGcp9eczBsAN+N74rOgq1iQ uIA8zV1KkcVjcVSTiitivFbC7PjANEdrdYjskCCl62z8aqJ2KwlTokwR830HGPuXtH wpMBEQAfqKw0JCJP7qJyE3LViPgNT4/dypn83FLs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peter Hutterer , Benjamin Tissoires , Jiri Kosina , =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= , Dmitry Torokhov , Sasha Levin Subject: [PATCH 4.19 06/51] Input: clear BTN_RIGHT/MIDDLE on buttonpads Date: Mon, 7 Mar 2022 10:18:41 +0100 Message-Id: <20220307091637.175319221@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220307091636.988950823@linuxfoundation.org> References: <20220307091636.988950823@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: José Expósito [ Upstream commit 37ef4c19b4c659926ce65a7ac709ceaefb211c40 ] Buttonpads are expected to map the INPUT_PROP_BUTTONPAD property bit and the BTN_LEFT key bit. As explained in the specification, where a device has a button type value of 0 (click-pad) or 1 (pressure-pad) there should not be discrete buttons: https://docs.microsoft.com/en-us/windows-hardware/design/component-guidelines/touchpad-windows-precision-touchpad-collection#device-capabilities-feature-report However, some drivers map the BTN_RIGHT and/or BTN_MIDDLE key bits even though the device is a buttonpad and therefore does not have those buttons. This behavior has forced userspace applications like libinput to implement different workarounds and quirks to detect buttonpads and offer to the user the right set of features and configuration options. For more information: https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/726 In order to avoid this issue clear the BTN_RIGHT and BTN_MIDDLE key bits when the input device is register if the INPUT_PROP_BUTTONPAD property bit is set. Notice that this change will not affect udev because it does not check for buttons. See systemd/src/udev/udev-builtin-input_id.c. List of known affected hardware: - Chuwi AeroBook Plus - Chuwi Gemibook - Framework Laptop - GPD Win Max - Huawei MateBook 2020 - Prestigio Smartbook 141 C2 - Purism Librem 14v1 - StarLite Mk II - AMI firmware - StarLite Mk II - Coreboot firmware - StarLite Mk III - AMI firmware - StarLite Mk III - Coreboot firmware - StarLabTop Mk IV - AMI firmware - StarLabTop Mk IV - Coreboot firmware - StarBook Mk V Acked-by: Peter Hutterer Acked-by: Benjamin Tissoires Acked-by: Jiri Kosina Signed-off-by: José Expósito Link: https://lore.kernel.org/r/20220208174806.17183-1-jose.exposito89@gmail.com Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/input.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/input/input.c b/drivers/input/input.c index a0d90022fcf73..b031174c8d7f7 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -2118,6 +2118,12 @@ int input_register_device(struct input_dev *dev) /* KEY_RESERVED is not supposed to be transmitted to userspace. */ __clear_bit(KEY_RESERVED, dev->keybit); + /* Buttonpads should not map BTN_RIGHT and/or BTN_MIDDLE. */ + if (test_bit(INPUT_PROP_BUTTONPAD, dev->propbit)) { + __clear_bit(BTN_RIGHT, dev->keybit); + __clear_bit(BTN_MIDDLE, dev->keybit); + } + /* Make sure that bitmasks not mentioned in dev->evbit are clean. */ input_cleanse_bitmasks(dev); -- 2.34.1