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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 3F95AC432BE for ; Mon, 9 Aug 2021 07:58:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 24B0B60462 for ; Mon, 9 Aug 2021 07:58:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233688AbhHIH67 (ORCPT ); Mon, 9 Aug 2021 03:58:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39610 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233476AbhHIH65 (ORCPT ); Mon, 9 Aug 2021 03:58:57 -0400 Received: from mail-lf1-x131.google.com (mail-lf1-x131.google.com [IPv6:2a00:1450:4864:20::131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 42DF2C0613D3; Mon, 9 Aug 2021 00:58:36 -0700 (PDT) Received: by mail-lf1-x131.google.com with SMTP id g13so32062032lfj.12; Mon, 09 Aug 2021 00:58:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=FDmayj9MsQZysMROrMQgY1uIkaotHyG2RR1Xax2u5P0=; b=dGECYCAe60SEi43dc3/+8Pah+Y0sJJYss3VH16DeLui2aKuQxIDDZ49Im6HIW0EGR7 +y3wjbT9FjgLcHL7UbcQV7bvY2nqyab+Dqhk6hdsVQY5UN2xz+BECZbKp5WNQVNQnlon dE2lWodKV5DxOjjzQ78Yl8B3yuX+ziR5H/+ACLQHEV8sJOtlBV3mVfulRD1L+KJd8dY+ OtVMfVR0aBtgJCtwNXcYDB5NryzBsq1mfzN3aSX2T9OEAkjDmwfuzjJ/F2ApRkkI1bLM 3FMQzTrgiXpCafSdDInl7EJqo9T8KD6c0GeutpuSwrtU7wKsSX5xB9VPg5zfV/IA7zNl qcmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=FDmayj9MsQZysMROrMQgY1uIkaotHyG2RR1Xax2u5P0=; b=GMQvjWd9PVg9kpq9Bl0KqHp5bTFSb/LkVH9NCTTA6+W3wwvzsdNs5Ll8gnorUT1OSc Uvd6N4fT8YLJSZmIArX2UHzpeF0C+lQcDuR8dapuH7vVQWAaCb5m1/ZekLiZetdMDknm 3WHxvoJ93o8D/2WU1SngYygglEGByeTZGRamQuFoNsqiBYjTPEGhO19YiFkEuZCbtIUb 2ayKdQ8Ujq3SCFCOUwquc7yDzBwmGNVMWspaE9iy12rwrsdo5HxySoa+/JOyPX2RPlkS BpOv8untaTIpVI2O+1AVB7RviSuglZNg4GuMM8TUWdMYVJYBMnHyB7RxzKFPnM1pDocV G4/g== X-Gm-Message-State: AOAM530Ak8iL1F5yy2sruQPEkr/XXBKZdpslNwBmqQIyVz/78Qk2GoM2 4Xd4cunscp6ayD1IAdOuA/PQh+jBCW5noWWI31To2m7R9aw= X-Google-Smtp-Source: ABdhPJx7z6skN2zesJRMCNIIL+4iSrI6C5cDeRkQLPFhD0h4ZUEbMA+k0JyUYNNkuzES5dYkC2jocb7Zn4KXyeVVMmE= X-Received: by 2002:a05:6512:39c6:: with SMTP id k6mr16557377lfu.549.1628495914651; Mon, 09 Aug 2021 00:58:34 -0700 (PDT) MIME-Version: 1.0 From: Muni Sekhar Date: Mon, 9 Aug 2021 13:28:23 +0530 Message-ID: Subject: read() via USB bus To: kernelnewbies , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, PCIe memory mapped registers can be read via readb(), readw(), readl() kernel API's. Similarly what are the kernel API to read the device registers via USB bus -- Thanks, Sekhar