From patchwork Thu Jun 21 12:09:08 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 10479725 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 66F9960230 for ; Thu, 21 Jun 2018 12:10:24 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 574762921B for ; Thu, 21 Jun 2018 12:10:24 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4BF6F2921C; Thu, 21 Jun 2018 12:10:24 +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=unavailable 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 D614F29210 for ; Thu, 21 Jun 2018 12:10:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933297AbeFUMJ5 (ORCPT ); Thu, 21 Jun 2018 08:09:57 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:58394 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933507AbeFUMJc (ORCPT ); Thu, 21 Jun 2018 08:09:32 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 029938182D1F; Thu, 21 Jun 2018 12:09:32 +0000 (UTC) Received: from plouf.banquise.eu.com (ovpn-117-99.ams2.redhat.com [10.36.117.99]) by smtp.corp.redhat.com (Postfix) with ESMTP id B6F8A2026D6B; Thu, 21 Jun 2018 12:09:30 +0000 (UTC) From: Benjamin Tissoires To: Jiri Kosina , Dmitry Torokhov Cc: Mario.Limonciello@dell.com, Peter Hutterer , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Tissoires Subject: [PATCH v3 12/12] HID: multitouch: handle palm for touchscreens Date: Thu, 21 Jun 2018 14:09:08 +0200 Message-Id: <20180621120908.16706-13-benjamin.tissoires@redhat.com> In-Reply-To: <20180621120908.16706-1-benjamin.tissoires@redhat.com> References: <20180621120908.16706-1-benjamin.tissoires@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.4 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 21 Jun 2018 12:09:32 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Thu, 21 Jun 2018 12:09:32 +0000 (UTC) for IP:'10.11.54.4' DOMAIN:'int-mx04.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'benjamin.tissoires@redhat.com' RCPT:'' 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 From: Dmitry Torokhov Usually, there is no palm rejection for touchscreens. You don't rest your palm on the touchscreen while interacting with it. However, some wacom devices do so because you can rest your palm while interacting with the stylus. Unfortunately, the spec for touchscreens[1] is less precise than the one for touchpads[2]. This leads to a situation where it's 'legitimate' for a touchscreen to provide both tipswitch off and confidence off in the same report. Work around that by keeping the slot active for one frame where we report MT_TOOL_PALM, and then synthesizing the release event in a separate frame. frame Signed-off-by: Dmitry Torokhov [rebased and new commit message] Signed-off-by: Benjamin Tissoires Acked-by: Peter Hutterer --- changes in v2 (compared to Dmitry's initial submission): - extracted from the initial submission in a separate patch - rebased on top of my current series - add an extra input_mt_sync_frame(input); to release the single touch emulation no changes in v3 --- drivers/hid/hid-multitouch.c | 52 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 51 insertions(+), 1 deletion(-) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 9c708aa261ee..3a1c2d80729b 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -118,6 +118,9 @@ struct mt_application { int left_button_state; /* left button state */ unsigned int mt_flags; /* flags to pass to input-mt */ + unsigned long *pending_palm_slots; /* slots where we reported palm + * and need to release */ + __u8 num_received; /* how many contacts we received */ __u8 num_expected; /* expected last contact index */ __u8 buttons_count; /* number of physical buttons per touchpad */ @@ -863,6 +866,28 @@ static int mt_compute_slot(struct mt_device *td, struct mt_application *app, return input_mt_get_slot_by_key(input, *slot->contactid); } +static void mt_release_pending_palms(struct mt_device *td, + struct mt_application *app, + struct input_dev *input) +{ + int slotnum; + bool need_sync = false; + + for_each_set_bit(slotnum, app->pending_palm_slots, td->maxcontacts) { + clear_bit(slotnum, app->pending_palm_slots); + + input_mt_slot(input, slotnum); + input_mt_report_slot_state(input, MT_TOOL_PALM, false); + + need_sync = true; + } + + if (need_sync) { + input_mt_sync_frame(input); + input_sync(input); + } +} + /* * this function is called when a whole packet has been received and processed, * so that it can decide what to send to the input layer. @@ -876,6 +901,9 @@ static void mt_sync_frame(struct mt_device *td, struct mt_application *app, input_mt_sync_frame(input); input_event(input, EV_MSC, MSC_TIMESTAMP, app->timestamp); input_sync(input); + + mt_release_pending_palms(td, app, input); + app->num_received = 0; app->left_button_state = 0; @@ -970,8 +998,23 @@ static int mt_process_slot(struct mt_device *td, struct input_dev *input, if (app->application == HID_GD_SYSTEM_MULTIAXIS) tool = MT_TOOL_DIAL; - else if (unlikely(!confidence_state)) + else if (unlikely(!confidence_state)) { tool = MT_TOOL_PALM; + if (!active && + input_mt_is_active(&mt->slots[slotnum])) { + /* + * The non-confidence was reported for + * previously valid contact that is also no + * longer valid. We can't simply report + * lift-off as userspace will not be aware + * of non-confidence, so we need to split + * it into 2 events: active MT_TOOL_PALM + * and a separate liftoff. + */ + active = true; + set_bit(slotnum, app->pending_palm_slots); + } + } input_mt_slot(input, slotnum); input_mt_report_slot_state(input, tool, active); @@ -1206,6 +1249,13 @@ static int mt_touch_input_configured(struct hid_device *hdev, if (td->is_buttonpad) __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); + app->pending_palm_slots = devm_kcalloc(&hi->input->dev, + BITS_TO_LONGS(td->maxcontacts), + sizeof(long), + GFP_KERNEL); + if (!app->pending_palm_slots) + return -ENOMEM; + ret = input_mt_init_slots(input, td->maxcontacts, app->mt_flags); if (ret) return ret;