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=-7.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 2EFAEC4338F for ; Wed, 11 Aug 2021 10:04:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1187560F41 for ; Wed, 11 Aug 2021 10:04:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236679AbhHKKFP (ORCPT ); Wed, 11 Aug 2021 06:05:15 -0400 Received: from de-smtp-delivery-102.mimecast.com ([194.104.109.102]:47900 "EHLO de-smtp-delivery-102.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236573AbhHKKFO (ORCPT ); Wed, 11 Aug 2021 06:05:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=mimecast20200619; t=1628676283; 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=zY7IlNQveS7mZDONl1X1zTg8Sk5luSNcsx4pv8pCz/w=; b=FDHns+zZ40YcXe/TnC6VuUJShp3dXUIH7dItNRb92o8yz4mjEWsu2GhV9i6vlC/Ca1rSBB JX6h/AbDaLqNscDt93w7DfOTgBvi/pEtEQRsZNCJiHA9wyboqEKKa0T6vrDaqR/GuGxHJr jxlGzcgK1RgWAnjvko863cKvkTRuDoQ= Received: from EUR05-DB8-obe.outbound.protection.outlook.com (mail-db8eur05lp2104.outbound.protection.outlook.com [104.47.17.104]) (Using TLS) by relay.mimecast.com with ESMTP id de-mta-11-j8bKfrjgNreY5JSEjtQoeQ-1; Wed, 11 Aug 2021 12:04:42 +0200 X-MC-Unique: j8bKfrjgNreY5JSEjtQoeQ-1 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=SObmzXICfc0m6sYyDITd+pn0FUc4S/bh+P9cVU9dkhPl//krAUIrV3WhmyxY060G3tWIDGEsZjVPJxMFPS5dSCXE8nIXw1aPAKvPINCPkAufLB+C+3gsf3UUsL0kJ2/e0WfYzCzHFfgJyNOS5nEYS/w5zHR69UUWFGhSOPrLYEPyj0KpUrBp4KSYnSkiBd5K00lL4IjvG7wiORis0qkPFjeh1DjeA3353qeXfl2czXdVq+UsuyLA1gmjAR9Hz34O263Fr6cZffFUOeo9gD+ZrgUZxFBKGFd7gh318+kq8PBlmgivV8c1xFQjSCRGjviIEhNH16vELmPYN72+rctbIw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=4J/Tr3AyUok6Qr6jdvAY7MgLJxu++lwYwVvpgN/TKWQ=; b=YwAw5lv9PhBEstwZq3fVNX3SmAWXyOvTE0/fDHY45RdB3SXG5NSAxH8fo9+8Fz0FdWeqxSrzlyBtOawjWKeSUEaL4JphqIWZ6fcVnqMg4ZehDW7vhCAvCDsbPWHCuFkKPGwe1DCylm2ZUfSPMSDn0reNAI/AP9SeoWKNOw2Joge25RqnTMz5OwkPatJLYxUehrFyNV6qrt99N/7NJwOvXSJq5udZBmse1MqGG+jycXZcttKm0atVfMPMcclCMK8Qd6bs0J8QvWfvH/Nqk4aeJDio0kVMpqMzPN0UDBs2iS99h8YsMfRkETkJIfOBINJh85/7FRCAe29uoIkq1O6/kw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=suse.com; dmarc=pass action=none header.from=suse.com; dkim=pass header.d=suse.com; arc=none Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=suse.com; Received: from DB7PR04MB5050.eurprd04.prod.outlook.com (2603:10a6:10:22::23) by DB9PR04MB8284.eurprd04.prod.outlook.com (2603:10a6:10:25e::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.19; Wed, 11 Aug 2021 10:04:39 +0000 Received: from DB7PR04MB5050.eurprd04.prod.outlook.com ([fe80::4cc0:191d:5c04:8ede]) by DB7PR04MB5050.eurprd04.prod.outlook.com ([fe80::4cc0:191d:5c04:8ede%7]) with mapi id 15.20.4394.023; Wed, 11 Aug 2021 10:04:39 +0000 Subject: Re: read() via USB bus To: Muni Sekhar , Oliver Neukum CC: kernelnewbies , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org References: <8923f2b8-0be0-ffbf-70a4-c03c9a02d58a@suse.com> <4e7c9279-805c-c236-c048-2b817b1a7c3c@suse.com> From: Oliver Neukum Message-ID: <4ab157b8-5cc0-14cc-9245-5a235a52408f@suse.com> Date: Wed, 11 Aug 2021 12:04:36 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-ClientProxiedBy: AM8P190CA0002.EURP190.PROD.OUTLOOK.COM (2603:10a6:20b:219::7) To DB7PR04MB5050.eurprd04.prod.outlook.com (2603:10a6:10:22::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (2001:a61:3b0f:ce01:6142:66c1:effb:a0be) by AM8P190CA0002.EURP190.PROD.OUTLOOK.COM (2603:10a6:20b:219::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.17 via Frontend Transport; Wed, 11 Aug 2021 10:04:38 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: b13af83f-5c10-4847-ac4a-08d95caf6e33 X-MS-TrafficTypeDiagnostic: DB9PR04MB8284: X-LD-Processed: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba,ExtFwd X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6430; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DB7PR04MB5050.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(38100700002)(110136005)(186003)(8936002)(66556008)(66476007)(5660300002)(31686004)(86362001)(53546011)(8676002)(6486002)(6512007)(31696002)(6506007)(4744005)(66946007)(508600001)(316002)(4326008)(2616005)(2906002)(36756003)(43740500002)(45980500001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?8I9V21+d5TD5kKuA9Y76bSQTUJDtO5irnSDXf+V503UpOBj6zT1CrA9+a7BX?= =?us-ascii?Q?HWVHlQsOUDkFXdnodGXlRnIf46ELs9O4LTlFj2f7Zpl2TqqAZQ0l0HyT22qA?= =?us-ascii?Q?N1SC7b30ngeLCgHGprYqVVMgTzVXfSyjHXhz4co1W1vj/dHSqDyvF57Zxlwx?= =?us-ascii?Q?oiye11HgE5m78mFRItpb9dhI1Nu0GI5H3ycPS+aouXYuuY5KKhzg4ZfrEYMF?= =?us-ascii?Q?NyXwIceZn4ziejI6m9d8vAtaeJYiMHr7sgZG9s95/NF/sprgU6uM5tMSWgSr?= =?us-ascii?Q?3wTEM4McL/ft9YpXetEhyEs2wM7/TdfuRummxWdXimbG4h1VAMWprWK1yWed?= =?us-ascii?Q?c7YdcNKJk13Tn1KA8G3BMRIDGLPZGRm/l6GuI+Moby3v8buSOrEJcj5x/z/e?= =?us-ascii?Q?m1934ZjepgiyRTkKBZ8I6OO1UNBY/GJgjLubuoNRwBqswg6fLz7u5m0d5QEh?= =?us-ascii?Q?FXjSk8clh1zLpicJ6tqFKaoZai3zWFP1nAYn6ykA8tEymJPv9cSMXdnJ5EuC?= =?us-ascii?Q?ntcWfxikCWK0kBzes8gTxFR1ct+dvOlYZNqDZ/YAFPFe96VflQTmTyZh3wDm?= =?us-ascii?Q?iPfEONi+AhBB4EOXoDIipQn5t2PaUXce8L/Iaqf3i2MFIrzdYi3zurL51NMf?= =?us-ascii?Q?mEzpWyzC0E6ZQcq0lLnWa94WdCLismxj/lG6oSgXTruYMo+L2uiDf16N+nRi?= =?us-ascii?Q?uIr3ytX16Usrad8Ml0sraPocJBuYOvSidUlfZJ6P58M+PtGOF3+RF8nv25G8?= =?us-ascii?Q?LDM70qmU60LR3Z+Zi/XRk/xIjHPuZQ93qhBk8xwbYoar5ZWI9s8E1CmFMkLQ?= =?us-ascii?Q?WBr92FoMHD75kE//IN6giWeZMN53YWiJCTLfhqEqSUr1AKxZbgPsrVS+9z1p?= =?us-ascii?Q?q3bDF/AXIZALxL/eHlwFem5iSTkIeSkWNj4RcfHGXmmGd66vp6ckOiLDdF/a?= =?us-ascii?Q?FSsHSirwx45upmG6iGU6nw6EpcRrDUy7p/VstjgrnLMkiq1wVLmRXcs8FBfR?= =?us-ascii?Q?AEmS6bj4+QL0W+3r5/jw4NkjSDV5uP1jB2pTkZpcMKjS+eV+qRPGG1EYRkr5?= =?us-ascii?Q?42mqiIkPPzoC3bH5nRH7mr8Vcb78fQUr80so71+FsRn0m4YaFR6Cp1jxSYh6?= =?us-ascii?Q?Vh48yOVpks43hkRfm40L2gNaEsBE87W6IjXjgHQBkFrHzb79Xwqm7lyzSMA1?= =?us-ascii?Q?eB/ez2b4xu7BEItHPj7XLBJlHcyaHGmu3Htyef1PTMR9FnuORp4grqCaqHq+?= =?us-ascii?Q?VKgTF9giyp93dt/4e924nGv45oqILaQN0qpP2HIEjSFIFqcnZeX1rS7l2uQh?= =?us-ascii?Q?0LlIheldRocRGyMW/2DuP60YjzxoN0CPUY7J6n6O1Ayyd7Wurip050fvDreG?= =?us-ascii?Q?pa7PptPaRnN0vuPyo1BCBGTQFNry?= X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: b13af83f-5c10-4847-ac4a-08d95caf6e33 X-MS-Exchange-CrossTenant-AuthSource: DB7PR04MB5050.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Aug 2021 10:04:39.0046 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: TzrdaRZ2EcpKOn6aYYCtJI/Ewt6LPFJpwzfcqRWYgGUdMXGNIUoqinzVYaYBWwIXz7upca6OxW6GNLJ2CetL8A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR04MB8284 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 10.08.21 21:27, Muni Sekhar wrote: > > Any other examples of devices associated with the USB bus? Do we have > any reference driver in the mainline kernel tree? No, not really. We have the debug serial drivers, but they are associated with a host controller as such. > Does lsusb reports these devices? No. =C2=A0=C2=A0=C2=A0 Regards =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 Oliver