From patchwork Thu May 27 08:45:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Gmeiner X-Patchwork-Id: 12283729 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 24F2DC47089 for ; Thu, 27 May 2021 08:45:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 01B40613CC for ; Thu, 27 May 2021 08:45:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235459AbhE0IrQ (ORCPT ); Thu, 27 May 2021 04:47:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235457AbhE0IrQ (ORCPT ); Thu, 27 May 2021 04:47:16 -0400 Received: from mail-ej1-x633.google.com (mail-ej1-x633.google.com [IPv6:2a00:1450:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F1A0C061574; Thu, 27 May 2021 01:45:42 -0700 (PDT) Received: by mail-ej1-x633.google.com with SMTP id s22so6758403ejv.12; Thu, 27 May 2021 01:45:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/cQwyco3zF02M7nTlGhSF9ivKxGvmlRN3UcsYlTk9ek=; b=fMYMAS3NLVBE7kNccGYVDzrj+orSZV945AABDdZdU+V2xrbX50R86WCxE4JduqlXtD WMqlBAHnu6q9YqAzbYvEXz5CCTCsZM+zY7npUgCuZRrHGQdy/PvXiTFwT9S6eioVtH2/ speSEK2c4p0oq0x+wxwDDNG+J6dv1jflurLJnX1KpSJ+y08WWuFhD+MYY5XDjaAn7dOX 8VwmYB055k1KCJivPu+lhv52NY5xqpQ5vbPk4z3B8IQVfm2eciG+Y7xCSeMU4pfno4oo Uotenboe1oZr/Yq4ueENY8l4l04tW7CdqnIIrcAwNrA/yVnPgMKsDgCP9lgYhjxfVo7D MB8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=/cQwyco3zF02M7nTlGhSF9ivKxGvmlRN3UcsYlTk9ek=; b=NHHngSkNSJgmbZ+oVtetr2mfKNjgu2YY93GT1Op4B5EKO91xcdZOGWT9ucvzd0T8jn 05W4PNVlknFmL0Aa0fiHfiP6PB+RYu2y78Kj7ZvATmRSUJ0Yb1KTGyoNtVJwHEM4JHjH 95yGZXQYGIjTJCa7Vy1OOzVUUWaLUqHxtJR5KjbbellfxzgpuNOtteGrYQlFNB5M3A4d Y3BguBIHYplJlaZbRERbZpRJ1KSbCt4CCph6s/GMAaogXzVEFHSIYhCXM7JNHLlmT/0B QwhHl6SjXXmornq9Nr4WYbSWJD4I0zerWUBCfrxQEi9NPflWhqAaRJjcJZM7X5j/efPC LvAA== X-Gm-Message-State: AOAM530WlliBKMbI+tUScBmKUG+d/eNojhorqv6jiyJUUd7+IOYmpybr DkmgicT8jHL/IHZuRAjzsRBCMiN7M58= X-Google-Smtp-Source: ABdhPJwkKT3yCdVllDuFVEIsx0pKHPYmRjfnymTyyoKwBYTwr/381V/lD+9K/PWm0yvn6ddu13Jpcg== X-Received: by 2002:a17:906:5d0c:: with SMTP id g12mr2613378ejt.447.1622105140804; Thu, 27 May 2021 01:45:40 -0700 (PDT) Received: from localhost.localdomain.at (62-178-82-229.cable.dynamic.surfer.at. [62.178.82.229]) by smtp.gmail.com with ESMTPSA id jy21sm654578ejc.13.2021.05.27.01.45.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 May 2021 01:45:40 -0700 (PDT) From: Christian Gmeiner To: linux-kernel@vger.kernel.org Cc: Christian Gmeiner , Mark Brown , linux-spi@vger.kernel.org Subject: [PATCH] spidev: add platform driver support Date: Thu, 27 May 2021 10:45:15 +0200 Message-Id: <20210527084531.18989-1-christian.gmeiner@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org This makes it possible to use spidev in combination with the MFD subsystem. The MFD subsystem add platform_driver devices. Signed-off-by: Christian Gmeiner --- drivers/spi/spidev.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c index f56e0e975a46..fb7b483ff70d 100644 --- a/drivers/spi/spidev.c +++ b/drivers/spi/spidev.c @@ -25,6 +25,8 @@ #include #include +#include + #include @@ -827,6 +829,40 @@ static struct spi_driver spidev_spi_driver = { */ }; +static int spidev_platform_probe(struct platform_device *pdev) +{ + struct device *parent = pdev->dev.parent; + struct spi_device *spi; + + if (strcmp(parent->bus->name, "spi")) + return -ENODEV; + + spi = to_spi_device(parent); + + /* This only works if no drvdata is stored */ + if (spi_get_drvdata(spi)) { + dev_err(&pdev->dev, "drvdata is not NULL\n"); + return -EOPNOTSUPP; + } + + return spidev_probe(spi); +} + +static int spidev_platform_remove(struct platform_device *pdev) +{ + struct spi_device *spi = to_spi_device(pdev->dev.parent); + + return spidev_remove(spi); +} + +static struct platform_driver spidev_platfoem_driver = { + .probe = spidev_platform_probe, + .remove = spidev_platform_remove, + .driver = { + .name = "spidev", + }, +}; + /*-------------------------------------------------------------------------*/ static int __init spidev_init(void) @@ -853,12 +889,21 @@ static int __init spidev_init(void) class_destroy(spidev_class); unregister_chrdev(SPIDEV_MAJOR, spidev_spi_driver.driver.name); } + + status = platform_driver_register(&spidev_platfoem_driver); + if (status < 0) { + spi_unregister_driver(&spidev_spi_driver); + class_destroy(spidev_class); + unregister_chrdev(SPIDEV_MAJOR, spidev_spi_driver.driver.name); + } + return status; } module_init(spidev_init); static void __exit spidev_exit(void) { + platform_driver_unregister(&spidev_platfoem_driver); spi_unregister_driver(&spidev_spi_driver); class_destroy(spidev_class); unregister_chrdev(SPIDEV_MAJOR, spidev_spi_driver.driver.name);