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 X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01B58C432C0 for ; Fri, 22 Nov 2019 09:25:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C332820715 for ; Fri, 22 Nov 2019 09:25:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dG+CJPnY" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726846AbfKVJZd (ORCPT ); Fri, 22 Nov 2019 04:25:33 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:37571 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726364AbfKVJZd (ORCPT ); Fri, 22 Nov 2019 04:25:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574414731; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CXUUpsyWDU2cM+cLUQA59TfrNDN+V8AzlITcV72K0sY=; b=dG+CJPnYIzTSyqr+cW5+HInaSS9v24lz0cn8TUTAZNgYCmu2goKDTJJaUsc8oD9A+5xJ0r fSuRik8aX76yAasQibnktlHclZBd35L6O9golO4laLVnj6OwrZoP1ftST0EiEi5taedVW+ QPgHB5G5J01yCqHPQdl8HgvkOS/Esyo= Received: from mail-qv1-f71.google.com (mail-qv1-f71.google.com [209.85.219.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-199-Y_3e__dpPrSuvFgNwxvBuA-1; Fri, 22 Nov 2019 04:25:29 -0500 Received: by mail-qv1-f71.google.com with SMTP id y24so4303561qvh.1 for ; Fri, 22 Nov 2019 01:25:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=n8Fu7I27sg+o3llq8fP65oxlC1QYK1v+B/6fffBIWf8=; b=P6+HiHZwNhI0j9PRjEg0EcZNjpZs9YKWXv9d4FfsYQIPM2KD3rKwCi9H5biIiiAZ4d YWXc7DQypQJACC9vZVLNcJTFkuKjR7x7H7kDWeiUaYY3u6Jw5Nd61BR2mkJeKWgGNhAv gb2DwQ6xQqfmpAWtJK59YRUm6BO+ezyhovSn8r/v7eiukQK168hjrCUxEePFtL3xZz9j +b6H0Rl+WuTHHBoQRudUSZe5/EBRWPLQ9RZRONoF5mFGNk0NnzoaA2v7byYu/qIF7qYD AzN0vlQ6JFKOcDu507r3Djork6r2VHHi7DD5a68CuRFgQRUVkhTWw5iFVbtSYBUoDMTZ EJoA== X-Gm-Message-State: APjAAAX5xOxrYCDwVg/rkhorijTcGpJPd8BaZOmjrVXKRiMz+ERgakte YnNzFQC5NOFUhsGLFqv2T+qDNIxF5cYU9RK3uzXijjLH3iiHAyNtiOWyih2jVkJtisfCaUkSN/j UmQ+hk7FZVAmyrggU8h8pX1htAkOHQDUyI1JG7dw7 X-Received: by 2002:aed:36a1:: with SMTP id f30mr13265393qtb.154.1574414728593; Fri, 22 Nov 2019 01:25:28 -0800 (PST) X-Google-Smtp-Source: APXvYqyD37BLMlqnPOCX8i6ROdXzmtyW9EeZ7JDJ5JAHnSGaVnVpukZ6YHiBldF7Bg5sWuyrWfNns/8JSOlSAb/Kh9Y= X-Received: by 2002:aed:36a1:: with SMTP id f30mr13265368qtb.154.1574414728151; Fri, 22 Nov 2019 01:25:28 -0800 (PST) MIME-Version: 1.0 References: <4eecbd2a-9d19-c6a2-a95b-656e3fce05a4@codeaurora.org> <0101016e916ab42c-fbc61178-9bdd-42ba-b111-722c46db5dc1-000000@us-west-2.amazonses.com> In-Reply-To: <0101016e916ab42c-fbc61178-9bdd-42ba-b111-722c46db5dc1-000000@us-west-2.amazonses.com> From: Benjamin Tissoires Date: Fri, 22 Nov 2019 10:25:16 +0100 Message-ID: Subject: Re: Query regarding hid-multitouch.c driver in 4.14/4.19 To: Neeraj Upadhyay Cc: Jiri Kosina , Henrik Rydberg , "open list:HID CORE LAYER" , lkml , MSM , prsood@codeaurora.org, gkohli@codeaurora.org X-MC-Unique: Y_3e__dpPrSuvFgNwxvBuA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Neeraj, On Fri, Nov 22, 2019 at 5:42 AM Neeraj Upadhyay wr= ote: > > Hi Benjamin, > > Can you please provide guidance on how to workaround this problem? Is it > possible to support the 4.14 kernel behaviour again, so that existing > clients are not impacted? Hmm, hard to say. Both evdev outputs from 4.14 and 4.19 are technically valid. So I guess the issue is more that the android version you are using is not interpreting correctly the 4.19 event stream and probably requires some more events (like pressure or width/height). Also, the report descriptor is crap: 0x05, 0x0d, // Usage Page (Digitizers) 0 0x09, 0x02, // Usage (Pen) 2 0xa1, 0x01, // Collection (Application) 4 0x85, 0x01, // Report ID (1) 6 0x09, 0x22, // Usage (Finger) 8 0xa1, 0x02, // Collection (Logical) 10 0x09, 0x42, // Usage (Tip Switch) 12 0x15, 0x00, // Logical Minimum (0) 14 0x25, 0x01, // Logical Maximum (1) 16 0x75, 0x01, // Report Size (1) 18 0x95, 0x01, // Report Count (1) 20 0x81, 0x02, // Input (Data,Var,Abs) 22 0x09, 0x32, // Usage (In Range) 24 0x81, 0x02, // Input (Data,Var,Abs) 26 0x95, 0x06, // Report Count (6) 28 0x81, 0x03, // Input (Cnst,Var,Abs) 30 0x75, 0x08, // Report Size (8) 32 0x09, 0x51, // Usage (Contact Id) 34 0x95, 0x01, // Report Count (1) 36 0x81, 0x02, // Input (Data,Var,Abs) 38 0x05, 0x01, // Usage Page (Generic Desktop) 40 0x26, 0xff, 0x0f, // Logical Maximum (4095) 42 0x75, 0x10, // Report Size (16) 45 0x55, 0x0e, // Unit Exponent (-2) 47 0x65, 0x33, // Unit (Inch^3,EngLinear) 49 0x09, 0x30, // Usage (X) 51 0x35, 0x00, // Physical Minimum (0) 53 0x46, 0xb5, 0x04, // Physical Maximum (1205) 55 0x81, 0x02, // Input (Data,Var,Abs) 58 0x46, 0x8a, 0x03, // Physical Maximum (906) 60 0x09, 0x31, // Usage (Y) 63 0x81, 0x02, // Input (Data,Var,Abs) 65 0xc0, // End Collection 67 0x05, 0x0d, // Usage Page (Digitizers) 68 0x09, 0x54, // Usage (Contact Count) 70 0x95, 0x01, // Report Count (1) 72 0x75, 0x08, // Report Size (8) 74 0x81, 0x02, // Input (Data,Var,Abs) 76 0x85, 0x08, // Report ID (8) 78 0x09, 0x55, // Usage (Contact Max) 80 0x25, 0x05, // Logical Maximum (5) 82 0xb1, 0x02, // Feature (Data,Var,Abs) 84 0xc0, // End Collection 86 0x05, 0x0c, // Usage Page (Consumer Devices) 87 0x09, 0x01, // Usage (Consumer Control) 89 0xa1, 0x01, // Collection (Application) 91 0x85, 0x02, // Report ID (2) 93 0x09, 0xe9, // Usage (Volume Up) 95 0x09, 0xea, // Usage (Volume Down) 97 0x0a, 0xae, 0x01, // Usage (AL Keyboard Layout) 99 0x09, 0xe2, // Usage (Mute) 102 0x09, 0x30, // Usage (Power) 104 0x15, 0x01, // Logical Minimum (1) 106 0x25, 0x0c, // Logical Maximum (12) 108 0x75, 0x10, // Report Size (16) 110 0x95, 0x01, // Report Count (1) 112 0x81, 0x00, // Input (Data,Arr,Abs) 114 0xc0, // End Collection 116 It declares right at the beginning a Pen application collection then a Finger logical application. This should never happen as you can not use a pen with a bare finger. Anyway, there are a few things you could do to solve the issue, depending on what you are allowed to do: - if you can tweak the kernel, then maybe adding an extra kernel module that just binds to the device without changing anything in probe or in events might do the trick. For extra safety you should probably fix the report descriptor in this new kernel module - if you can tweak bluez or the device itself, at least change the ContactID usage to 00 (byte offset 35 above: change 0x51 to 0x00). It would be best to actually change the whole report descriptor with the correct applications, but, meh, this seems to be working. - if you can tweak android, then ensure it can understand this particular event stream Anyway, I don't think this is an upstream problem, as the device behaves somehow correctly by 5.3, at least it sends me the events I expect. So I can't really spend a lot of time providing a workaround for that. My best bet would be to contact the device maker, and ask them to fix their device to be working with 4.19 kernel. Cheers, Benjamin > > > Thanks > Neeraj > > On 11/14/2019 10:01 AM, Neeraj Upadhyay wrote: > > Hi Benjamin, > > > > Sorry for the delay, was waiting for the required information from our > > team. > > > > On 11/13/2019 3:00 PM, Benjamin Tissoires wrote: > >> Hi Neeraj, > >> > >> On Wed, Nov 13, 2019 at 4:11 AM Neeraj Upadhyay > >> wrote: > >>> Hi, > >>> > >>> I have one query regarding hid-multitouch.c driver and need your > >>> guidance on > >>> how hid-multitouchc can restore/support the original behaviour, > >>> where, for > >>> devices, for which application is not > >>> HID_DG_TOUCHSCREEN/HID_DG_TOUCHPAD, and has > >>> HID_DG_CONTACTID usage in its report, can still use generic input > >>> mappings. > >>> > >>> We are using kernel versions 4.14 , 4.19 respectively in 2 different > >>> projects: > >>> > >>> 4.14: > >>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree= /drivers/hid/hid-multitouch.c?h=3Dv4.14.153 > >>> > >>> 4.19: > >>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree= /drivers/hid/hid-multitouch.c?h=3Dv4.19.83 > >>> > >>> > >>> I checked the application for our hid device, it's HID_DG_PEN, device > >>> also has a HID_DG_CONTACTID usage defined in > >>> > >>> its report. > >>> > >>> In 4.19, is_mt_collection is set to 'true'. All multitouch code paths= or > >>> input mapping is configured > >>> > >>> mt_allocate_report_data() > >>> ... > >>> for (n =3D 0; n < field->report_count; n++) { > >>> if (field->usage[n].hid =3D=3D HID_DG_CONTA= CTID) > >>> rdata->is_mt_collection =3D true; = // > >>> is_mt_collection is set to 'true' > >>> } > >>> } > >>> > >>> mt_input_mapping() > >>> ... > >>> if (rdata->is_mt_collection) > >>> return mt_touch_input_mapping(...) // > >>> mt_touch_input_mapping() is called > >>> > >>> mt_event() > >>> if (rdata && rdata->is_mt_collection) > >>> return mt_touch_event(); // mt_touch_event() is called > >>> > >>> However, in 4.14, the behaviour was different, mt input mapping was d= one > >>> only > >>> for HID_DG_TOUCHSCREEN/HID_DG_TOUCHPAD , and because our hid device i= s > >>> HID_DG_PEN, generic mappings were applied for it; with these settings= , > >>> device > >>> responds to events. > >>> > >>> static int mt_input_mapping() > >>> if (field->application =3D=3D HID_DG_TOUCHSCREEN || > >>> field->application =3D=3D HID_DG_TOUCHPAD) > >>> return mt_touch_input_mapping(); // This is not called= . > >>> > >>> > >>> mt_touch_input_mapping() > >>> case HID_DG_CONTACTID: > >>> mt_store_field(usage, td, hi); > >>> td->touches_by_report++; > >>> td->mt_report_id =3D field->report->id; // > >>> mt_report_id is not set. > >>> return 1; > >>> > >>> > >>> Looks like this behaviour changed, with below commits: > >>> > >>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/comm= it/drivers/hid/hid-multitouch.c?h=3Dv4.19.83&id=3D8dfe14b3b47ff832cb638731f= 9fc696a3a84f804 > >>> > >>> 8dfe14b3b47f HID: multitouch: ditch mt_report_id > >>> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/comm= it/drivers/hid/hid-multitouch.c?h=3Dv4.19.83&id=3Dba6b055e0f3b4ff4942e4ab27= 3260affcfad9bff > >>> > >>> ba6b055e0f3b HID: input: enable Totem on the Dell Canvas 27 > >>> > >>> Can you please suggest on how we can support/preserve the original > >>> behaviour? > >> Hmm, I would initially say that a firmware that exports Contact ID for > >> a Pen is definitely wrong. The Contact ID usage has been introduced in > >> https://www.usb.org/sites/default/files/hutrr34.pdf and is > >> specifically for multi-touch, not multi pen. > >> > >> Anyway, couple of questions: > >> - does the device supports multi-pen? > > > > Actually the device is a selfie stick device: > > https://item.jd.com/33082497741.html > > > > It does not support multi-pen. > > > >> - can you share the report descriptor and a few events when triggering > >> this particular report (ideally with hid-recorder from > >> https://gitlab.freedesktop.org/libevdev/hid-tools/ > > > > Report descriptor is below: > > > > 05 0d 09 02 a1 01 85 01 09 22 a1 02 09 42 15 00 25 01 75 01 95 01 81 02 > > 09 32 81 02 95 06 81 03 75 08 09 51 95 01 81 02 05 01 26 ff 0f 75 10 55 > > 0e 65 33 09 30 35 00 46 b5 04 81 02 46 8a 03 09 31 81 02 c0 05 0d 09 54 > > 95 01 75 08 81 02 85 08 09 55 25 05 b1 02 c0 05 0c 09 01 a1 01 85 02 09 > > e9 09 ea 0a ae 01 09 e2 09 30 15 01 25 0c 75 10 95 01 81 00 c0 > > > > Events were collected using getevent call in adb shell in android: > > > > On 4.19 > > > > # getevent -l > > > > add device 7: /dev/input/event6 > > name: "BLE-M1 UNKNOWN" > > > > /dev/input/event6: EV_ABS ABS_MT_TRACKING_ID 00000000 > > /dev/input/event6: EV_ABS ABS_MT_POSITION_X 00000800 > > /dev/input/event6: EV_ABS ABS_MT_POSITION_Y 00000d60 > > /dev/input/event6: EV_KEY BTN_TOUCH DOWN > > /dev/input/event6: EV_SYN SYN_REPORT 00000000 > > /dev/input/event6: EV_ABS ABS_MT_TRACKING_ID ffffffff > > /dev/input/event6: EV_KEY BTN_TOUCH UP > > /dev/input/event6: EV_SYN SYN_REPORT 00000000 > > /dev/input/event6: EV_ABS ABS_MT_TRACKING_ID 00000001 > > /dev/input/event6: EV_KEY BTN_TOUCH DOWN > > /dev/input/event6: EV_SYN SYN_REPORT 00000000 > > /dev/input/event6: EV_ABS ABS_MT_TRACKING_ID ffffffff > > /dev/input/event6: EV_KEY BTN_TOUCH UP > > /dev/input/event6: EV_SYN SYN_REPORT 00000000 > > > > On 4.14 > > > > add device 2: /dev/input/event5 > > name: "BLE-M1 UNKNOWN" > > > > /dev/input/event5: EV_MSC MSC_SCAN 000d0042 > > /dev/input/event5: EV_KEY BTN_TOUCH DOWN > > /dev/input/event5: EV_KEY BTN_DIGI DOWN > > /dev/input/event5: EV_ABS ABS_MISC 00000001 > > /dev/input/event5: EV_ABS ABS_X 00000800 > > /dev/input/event5: EV_ABS ABS_Y 00000d60 > > /dev/input/event5: EV_ABS 0029 00000001 > > /dev/input/event5: EV_SYN SYN_REPORT 00000000 > > > > /dev/input/event5: EV_MSC MSC_SCAN 000d0042 > > /dev/input/event5: EV_KEY BTN_TOUCH UP > > /dev/input/event5: EV_KEY BTN_DIGI UP > > /dev/input/event5: EV_ABS 0029 00000000 > > /dev/input/event5: EV_SYN SYN_REPORT 00000000 > > > > /dev/input/event5: EV_MSC MSC_SCAN 000d0042 > > /dev/input/event5: EV_KEY BTN_TOUCH DOWN > > /dev/input/event5: EV_KEY BTN_DIGI DOWN > > /dev/input/event5: EV_ABS 0029 00000001 > > /dev/input/event5: EV_SYN SYN_REPORT 00000000 > > > > /dev/input/event5: EV_MSC MSC_SCAN 000d0042 > > /dev/input/event5: EV_KEY BTN_TOUCH UP > > /dev/input/event5: EV_KEY BTN_DIGI UP > > /dev/input/event5: EV_ABS 0029 00000000 > > /dev/input/event5: EV_SYN SYN_REPORT 00000000 > > > > > > As I have little understanding of the framework, use cases and of the > > flow, I am sorry, if the information provided above is > > > > incomplete (w.r.t. what you were expecting). > > > > > > Thanks > > > > Neeraj > > > >> Cheers, > >> Benjamin > >> > >>> > >>> Thanks > >>> Neeraj > >>> > >>> -- > >>> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a > >>> member of the Code Aurora Forum, hosted by The Linux Foundation > >>> > > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a > member of the Code Aurora Forum, hosted by The Linux Foundation >