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=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 036ADC1975A for ; Wed, 25 Mar 2020 17:13:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D531D20772 for ; Wed, 25 Mar 2020 17:13:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="e0Ed5MpR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727564AbgCYRNN (ORCPT ); Wed, 25 Mar 2020 13:13:13 -0400 Received: from mail-pf1-f169.google.com ([209.85.210.169]:42149 "EHLO mail-pf1-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726102AbgCYRNN (ORCPT ); Wed, 25 Mar 2020 13:13:13 -0400 Received: by mail-pf1-f169.google.com with SMTP id 22so1343448pfa.9; Wed, 25 Mar 2020 10:13:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=message-id:date:from:to:cc:subject:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to :user-agent; bh=RXLxeC9OROmQQXYGBBBEvN5sljiBTZ5VVdFyLA+6ua4=; b=e0Ed5MpREuQ7o1oPQZGuPjGHKWcFg4OGWmXLOH0qOcZrgFs8+q55lZ0VyEt4zyDCu0 nbNBjBVJWBq4+9p0e08lTof4j3m+Ikdzpwkm5DadcWo9a6TKGAwXScW24KlcLL7gapsc +omZRWNNfTI0/z17YeAkDV63aBEOcyr4hciF/gxQ6ZhzfAL+W69s1H7eCPNikyH0N7K+ P8YL2f99uA+1t4/aFE965BWaT+qk/ju0Lte+JIQfcol9ioaHC7YePgSd7Z5PT5khb/Pv W1EhR5V4r2TZLbD1KMPvg94sjMczD2McgrodCfRDUPCxdukC9zXvikbc+/vnc1/BBC8z 1Bfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:date:from:to:cc:subject:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=RXLxeC9OROmQQXYGBBBEvN5sljiBTZ5VVdFyLA+6ua4=; b=aZBFniukyRkny5w5OrGTIWfGUP1lIOgwB5NxrMwxAJwbIW6HH6V1xD/Q1IgwHd3RU4 +iA1KlMjyNMbiZn9nBRYPIp3wtouV3GlVA9K1dgGumOKBOVVPrHSvmIb6ADSHFpmhg+9 5qFxg5w1GF3iMKeOBL/MioIcFttkju2q2aqVfqSKMX887C+wYwm9T/M5bz33MfR52fX/ uBvVDfAMAhmkOPWm7OgZI/d7uofhanQFwV28gWd/NKw6JlC0QZ2FDSKDIcRRgf/FJ5eI seNYfM8h+aU5xsEv0JCSD4tMYaQhMZoOElbsckM82TRPEQu3kqI+vCAVX52J4g7c4ddc is5w== X-Gm-Message-State: ANhLgQ0WuODDINVkYz168cuaCjWV0g259J2S6v9FJiO7u5ATr5jmy+lh hVavG+wMWSQpFlEVWs2jd6SqtD3O X-Google-Smtp-Source: ADFU+vs86ffP/e+SCry5iFxYjVSnYEt4s2soEoNVz+crbuyUfCEt36uuqUmX7ftfYOCzwhBDU7YFhA== X-Received: by 2002:aa7:9695:: with SMTP id f21mr4510450pfk.93.1585156392040; Wed, 25 Mar 2020 10:13:12 -0700 (PDT) Received: from SARKAR ([106.51.108.92]) by smtp.gmail.com with ESMTPSA id nu13sm5186359pjb.22.2020.03.25.10.13.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2020 10:13:11 -0700 (PDT) Message-ID: <5e7b9127.1c69fb81.f2f8b.582c@mx.google.com> X-Google-Original-Message-ID: <20200325171307.GD7983@rohitsarkar5398@gmail.com> Date: Wed, 25 Mar 2020 22:43:07 +0530 From: Rohit Sarkar To: Hubert CHAUMETTE Cc: Oliver Neukum , linux-usb@vger.kernel.org, linux-newbie@vger.kernel.org Subject: Re: Beginner query regarding usbhid References: <5e7b5fbc.1c69fb81.cace7.7aa1@mx.google.com> <1585147543.3831.8.camel@suse.com> <5e7b6f15.1c69fb81.d92d3.facb@mx.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Wed, Mar 25, 2020 at 04:41:38PM +0100, Hubert CHAUMETTE wrote: > Le 25/03/2020 15:47, Rohit Sarkar a écrit : > > I was trying to mess around with the driver that drives my mouse. I > > found out that it is usbhid. I then added a printk statement to the init > > and exit function of usbhid. > > I then compiled and installed the usbhid drivers. Post that I ran > > `sudo modprobe -r usbhid` and `sudo modprobe usbhid` but couldnt observe > > any logs in dmesg. > > > > I am certain I am missing something fundamental. Could someone help me > > with this. > > Hi, > > Did you check whether your module was effectively loaded with lsmod? > What log level did you use in your printk statement? Depending on your > system default loglevel your logs might not be printed. A quick fix > would be to use one of the lowest levels (pr_emerg, but pr_err might > suffice). > Regards, Hey, I did check that module was loaded. And one of the signs was that my mouse started working after insmod :). I used printk(KERN_ALERT "some message") for logging. I also tried with KERN_ERR but no luck. The command I used for building was "make -C /home/rohit/LINUX/kernels/staging M=$(pwd)" and for installing the modules: "sudo make -C /home/rohit/LINUX/kernels/staging M=$(pwd) modules_install" both were executed from the usbhid directory. from the usbhid directory. > Hubert Chaumette Thanks, Rohit