From patchwork Mon Jun 17 12:05:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hui Wang X-Patchwork-Id: 10998909 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6578E6C5 for ; Mon, 17 Jun 2019 12:06:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 57725287C8 for ; Mon, 17 Jun 2019 12:06:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4BC25288B3; Mon, 17 Jun 2019 12:06:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C0F5B288DC for ; Mon, 17 Jun 2019 12:06:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725884AbfFQMGQ (ORCPT ); Mon, 17 Jun 2019 08:06:16 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:46185 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725681AbfFQMGQ (ORCPT ); Mon, 17 Jun 2019 08:06:16 -0400 Received: from [123.123.252.185] (helo=localhost.localdomain) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.76) (envelope-from ) id 1hcqOr-00021C-GA; Mon, 17 Jun 2019 12:06:14 +0000 From: Hui Wang To: linux-input@vger.kernel.org Cc: dmitry.torokhov@gmail.com, pali.rohar@gmail.com, xiaoxiao.liu-1@cn.alps.com, sliuuxiaonxiao@gmail.com, xiaojian.cao@cn.alps.com, naoki.saito@alpsalpine.com, hideo.kawase@alpsalpine.com Subject: [PATCH v4] Input: alps - Don't handle ALPS cs19 trackpoint-only device Date: Mon, 17 Jun 2019 20:05:55 +0800 Message-Id: <20190617120555.8750-1-hui.wang@canonical.com> X-Mailer: git-send-email 2.17.1 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP On a latest Lenovo laptop, the trackpoint and 3 buttons below it don't work at all, when we move the trackpoint or press those 3 buttons, the kernel will print out: "Rejected trackstick packet from non DualPoint device" This device is identified as alps touchpad but the packet has trackpoint format, so the alps.c drops the packet and prints out the message above. According to XiaoXiao's explanation, this device is named cs19 and is trackpoint-only device, its firmware is only for trackpoint, it is independent of touchpad and is a completely different device from DualPoint ones. To drive this device with mininal changes to the existing driver, we just let the alps driver not handle this device, then the trackpoint.c will be the driver of this device. With the trackpoint.c, this trackpoint and 3 buttons all work well, they have all features that the trackpoint should have, like scrolling-screen, drag-and-drop and frame-selection. Signed-off-by: XiaoXiao Liu Signed-off-by: Hui Wang --- Sorry, forgot to add "param[1] & 0x20" checking in the v3, please ignore the v3 patch. drivers/input/mouse/alps.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c index 0a6f7ca883e7..6bed9eb16c2c 100644 --- a/drivers/input/mouse/alps.c +++ b/drivers/input/mouse/alps.c @@ -24,6 +24,7 @@ #include "psmouse.h" #include "alps.h" +#include "trackpoint.h" /* * Definitions for ALPS version 3 and 4 command mode protocol @@ -2864,6 +2865,23 @@ static const struct alps_protocol_info *alps_match_table(unsigned char *e7, return NULL; } +static bool alps_is_cs19_trackpoint(struct psmouse *psmouse) +{ + u8 param[2] = { 0 }; + + if (ps2_command(&psmouse->ps2dev, + param, MAKE_PS2_CMD(0, 2, TP_READ_ID))) + return false; + + if ((param[0] == TP_VARIANT_ALPS) && (param[1] & 0x20)) { + psmouse_warn(psmouse, + "It is an ALPS trackpoint-only device (CS19), make sure the MOUSE_PS2_TRACKPOINT is enabled to drive it\n"); + return true; + } + + return false; +} + static int alps_identify(struct psmouse *psmouse, struct alps_data *priv) { const struct alps_protocol_info *protocol; @@ -3164,6 +3182,17 @@ int alps_detect(struct psmouse *psmouse, bool set_properties) if (error) return error; + /* + * ALPS cs19 is a trackpoint-only device, it is completely independent + * of touchpad. So it is a different device from DualPoint ones, if it + * is identified as a cs19 trackpoint device, we return -EINVAL here and + * let trackpoint.c to drive this device. + * If ps2_command() fails here, we depend on the immediate followed + * psmouse_reset() to reset the device to normal state. + */ + if (alps_is_cs19_trackpoint(psmouse)) + return -EINVAL; + /* * Reset the device to make sure it is fully operational: * on some laptops, like certain Dell Latitudes, we may