From patchwork Thu Apr 29 13:55:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnaud Pouliquen X-Patchwork-Id: 12231351 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 933EBC43600 for ; Thu, 29 Apr 2021 13:55:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4DE716144B for ; Thu, 29 Apr 2021 13:55:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238780AbhD2N4c (ORCPT ); Thu, 29 Apr 2021 09:56:32 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:7136 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S237385AbhD2N42 (ORCPT ); Thu, 29 Apr 2021 09:56:28 -0400 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 13TDqoBh016942; Thu, 29 Apr 2021 15:55:37 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=selector1; bh=znudQlfS5PDiJZ59RvZ8YQ+jjVF5/hp4/M3cw5xvrR4=; b=VFK1pXQByRU8Gp782E+HSWiB2Ix1GRI6qMOPSqQGtC6uU06afQFQuLWVwj0t5/daY+QN 1kY5PbK1DMbqnccMtZqxbwj5iPsObJT8Re4d0XosTgLTf3xuMwaWCRtCdjzftfGk1i/K TpwkNVSHRrTKu0vK/p+1XWHJHNEFH/CxJ34rjKfaAKzkAtIOArZpaWM6RkFDpBcZtRRT +0DmeiVQiJXlxzjwQ3RMizmbSFj0L6y7qsFF2qWG8FzB0M5624++ns7EYNTeRg3Tq+0U OkEAURYUG6HUUAReUjC27RmWPRXRGpZl5uvZHgu1HwnusFkUUt3OA+/GYSeqsB8Un18P YQ== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 38735wt32q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Apr 2021 15:55:37 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 216DA100034; Thu, 29 Apr 2021 15:55:37 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag2node3.st.com [10.75.127.6]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 167C62178F3; Thu, 29 Apr 2021 15:55:37 +0200 (CEST) Received: from localhost (10.75.127.44) by SFHDAG2NODE3.st.com (10.75.127.6) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 29 Apr 2021 15:55:36 +0200 From: Arnaud Pouliquen To: Bjorn Andersson , Ohad Ben-Cohen , Mathieu Poirier CC: , , , Subject: [PATCH v3 5/6] rpmsg: char: Introduce a rpmsg driver for the rpmsg char device Date: Thu, 29 Apr 2021 15:55:06 +0200 Message-ID: <20210429135507.8264-6-arnaud.pouliquen@foss.st.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210429135507.8264-1-arnaud.pouliquen@foss.st.com> References: <20210429135507.8264-1-arnaud.pouliquen@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.75.127.44] X-ClientProxiedBy: SFHDAG2NODE2.st.com (10.75.127.5) To SFHDAG2NODE3.st.com (10.75.127.6) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761 definitions=2021-04-29_07:2021-04-28,2021-04-29 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org A rpmsg char device allows to probe the endpoint device on a remote name service announcement. With this patch the /dev/rpmsgX interface is created either by a user application or by the remote firmware. Signed-off-by: Arnaud Pouliquen --- update from V1: - add missing unregister_rpmsg_driver call on module exit. --- drivers/rpmsg/rpmsg_char.c | 53 +++++++++++++++++++++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 5c6a7da6e4d7..9166454c1310 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -18,6 +18,8 @@ #include "rpmsg_char.h" +#define RPMSG_CHAR_DEVNAME "rpmsg-raw" + static dev_t rpmsg_major; static struct class *rpmsg_class; @@ -413,6 +415,40 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent } EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create); +static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) +{ + struct rpmsg_channel_info chinfo; + + memcpy(chinfo.name, RPMSG_CHAR_DEVNAME, sizeof(RPMSG_CHAR_DEVNAME)); + chinfo.src = rpdev->src; + chinfo.dst = rpdev->dst; + + return __rpmsg_chrdev_eptdev_create(rpdev, &rpdev->dev, chinfo, true); +} + +static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) +{ + int ret; + + ret = device_for_each_child(&rpdev->dev, NULL, rpmsg_chrdev_eptdev_destroy); + if (ret) + dev_warn(&rpdev->dev, "failed to destroy endpoints: %d\n", ret); +} + +static struct rpmsg_device_id rpmsg_chrdev_id_table[] = { + { .name = RPMSG_CHAR_DEVNAME }, + { }, +}; + +static struct rpmsg_driver rpmsg_chrdev_driver = { + .probe = rpmsg_chrdev_probe, + .remove = rpmsg_chrdev_remove, + .id_table = rpmsg_chrdev_id_table, + .drv = { + .name = "rpmsg_chrdev", + }, +}; + static int rpmsg_chrdev_init(void) { int ret; @@ -427,15 +463,30 @@ static int rpmsg_chrdev_init(void) if (IS_ERR(rpmsg_class)) { pr_err("failed to create rpmsg class\n"); unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); - return PTR_ERR(rpmsg_class); + ret = PTR_ERR(rpmsg_class); + goto free_region; + } + + ret = register_rpmsg_driver(&rpmsg_chrdev_driver); + if (ret < 0) { + pr_err("rpmsg: failed to register rpmsg raw driver\n"); + goto free_class; } return 0; + +free_class: + class_destroy(rpmsg_class); +free_region: + unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); + + return ret; } postcore_initcall(rpmsg_chrdev_init); static void rpmsg_chrdev_exit(void) { + unregister_rpmsg_driver(&rpmsg_chrdev_driver); class_destroy(rpmsg_class); unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); }