From patchwork Tue Oct 4 13:49:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nuno Sa X-Patchwork-Id: 12998405 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41237C433F5 for ; Tue, 4 Oct 2022 13:50:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229838AbiJDNuV (ORCPT ); Tue, 4 Oct 2022 09:50:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49580 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229927AbiJDNuO (ORCPT ); Tue, 4 Oct 2022 09:50:14 -0400 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C782F175A3 for ; Tue, 4 Oct 2022 06:50:10 -0700 (PDT) Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 294BJ1Is024406; Tue, 4 Oct 2022 09:49:27 -0400 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com (PPS) with ESMTPS id 3jxjf733qx-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 04 Oct 2022 09:49:27 -0400 Received: from ASHBMBX8.ad.analog.com (ASHBMBX8.ad.analog.com [10.64.17.5]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 294DnQRr004139 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 4 Oct 2022 09:49:26 -0400 Received: from ASHBCASHYB5.ad.analog.com (10.64.17.133) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Tue, 4 Oct 2022 09:49:25 -0400 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) by ASHBCASHYB5.ad.analog.com (10.64.17.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Tue, 4 Oct 2022 09:49:25 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Tue, 4 Oct 2022 09:49:25 -0400 Received: from nsa.ad.analog.com ([10.44.3.52]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 294DlkVk032663; Tue, 4 Oct 2022 09:49:18 -0400 From: =?utf-8?q?Nuno_S=C3=A1?= To: , , , , CC: Heiko Stuebner , Martin Blumenstingl , Neil Armstrong , Shawn Guo , "Lars-Peter Clausen" , Jyoti Bhayana , Hans de Goede , Andriy Tryshnivskyy , Pengutronix Kernel Team , Miquel Raynal , Cixi Geng , Baolin Wang , "Ciprian Regus" , Fabio Estevam , =?utf-8?q?Nuno_S=C3=A1?= , Sascha Hauer , Alexandru Ardelean , "Florian Boor" , Michael Hennerich , Orson Zhai , "Chen-Yu Tsai" , Chunyan Zhang , "Vladimir Zapolskiy" , Andy Shevchenko , "Jerome Brunet" , Haibo Chen , Kevin Hilman , Jonathan Cameron Subject: [PATCH v2 13/16] iio: core: introduce iio_device_{claim|release}_buffer_mode() APIs Date: Tue, 4 Oct 2022 15:49:06 +0200 Message-ID: <20221004134909.1692021-14-nuno.sa@analog.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221004134909.1692021-1-nuno.sa@analog.com> References: <20221004134909.1692021-1-nuno.sa@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: ChmT1XlIn5bXPESCNWLX96Xy6pt4Cbcv X-Proofpoint-ORIG-GUID: ChmT1XlIn5bXPESCNWLX96Xy6pt4Cbcv X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-10-04_06,2022-09-29_03,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 bulkscore=0 mlxscore=0 priorityscore=1501 spamscore=0 adultscore=0 impostorscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210040089 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org These APIs are analogous to iio_device_claim_direct_mode() and iio_device_release_direct_mode() but, as the name suggests, with the logic flipped. While this looks odd enough, it will have at least two users (in following changes) and it will be important to move the iio mlock to the private struct. Signed-off-by: Nuno Sá --- drivers/iio/industrialio-core.c | 38 +++++++++++++++++++++++++++++++++ include/linux/iio/iio.h | 2 ++ 2 files changed, 40 insertions(+) diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 151ff3993354..c23d3abb33c5 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -2083,6 +2083,44 @@ void iio_device_release_direct_mode(struct iio_dev *indio_dev) } EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); +/** + * iio_device_claim_buffered_mode - Keep device in buffer mode + * @indio_dev: the iio_dev associated with the device + * + * If the device is in buffer mode it is guaranteed to stay + * that way until iio_device_release_buffer_mode() is called. + * + * Use with iio_device_release_buffer_mode() + * + * Returns: 0 on success, -EBUSY on failure + */ +int iio_device_claim_buffer_mode(struct iio_dev *indio_dev) +{ + mutex_lock(&indio_dev->mlock); + + if (iio_buffer_enabled(indio_dev)) + return 0; + + mutex_unlock(&indio_dev->mlock); + return -EBUSY; +} +EXPORT_SYMBOL_GPL(iio_device_claim_buffer_mode); + +/** + * iio_device_release_buffer_mode - releases claim on buffer mode + * @indio_dev: the iio_dev associated with the device + * + * Release the claim. Device is no longer guaranteed to stay + * in buffer mode. + * + * Use with iio_device_claim_buffer_mode() + */ +void iio_device_release_buffer_mode(struct iio_dev *indio_dev) +{ + mutex_unlock(&indio_dev->mlock); +} +EXPORT_SYMBOL_GPL(iio_device_release_buffer_mode); + /** * iio_device_get_current_mode() - helper function providing read-only access to * the opaque @currentmode variable diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index f0ec8a5e5a7a..9d3bd6379eb8 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -629,6 +629,8 @@ int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); int iio_device_claim_direct_mode(struct iio_dev *indio_dev); void iio_device_release_direct_mode(struct iio_dev *indio_dev); +int iio_device_claim_buffer_mode(struct iio_dev *indio_dev); +void iio_device_release_buffer_mode(struct iio_dev *indio_dev); extern struct bus_type iio_bus_type;