From patchwork Wed Oct 12 15:16:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nuno Sa X-Patchwork-Id: 13005146 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 0D5CFC433FE for ; Wed, 12 Oct 2022 15:17:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229599AbiJLPQ7 (ORCPT ); Wed, 12 Oct 2022 11:16:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229934AbiJLPQp (ORCPT ); Wed, 12 Oct 2022 11:16:45 -0400 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C2903DD892 for ; Wed, 12 Oct 2022 08:16:39 -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 29CEa37s032678; Wed, 12 Oct 2022 11:15:43 -0400 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com (PPS) with ESMTPS id 3k3645e141-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 12 Oct 2022 11:15:42 -0400 Received: from ASHBMBX9.ad.analog.com (ASHBMBX9.ad.analog.com [10.64.17.10]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 29CFFfWt049221 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 12 Oct 2022 11:15:41 -0400 Received: from ASHBCASHYB4.ad.analog.com (10.64.17.132) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Wed, 12 Oct 2022 11:15:41 -0400 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBCASHYB4.ad.analog.com (10.64.17.132) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Wed, 12 Oct 2022 11:15:40 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Wed, 12 Oct 2022 11:15:40 -0400 Received: from nsa.ad.analog.com ([10.44.3.62]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 29CFEunc022095; Wed, 12 Oct 2022 11:15:29 -0400 From: =?utf-8?q?Nuno_S=C3=A1?= To: , , , , CC: Chen-Yu Tsai , Andriy Tryshnivskyy , Ciprian Regus , Vladimir Zapolskiy , Cixi Geng , Neil Armstrong , "Miquel Raynal" , Sascha Hauer , Heiko Stuebner , =?utf-8?q?Nuno_S=C3=A1?= , Fabio Estevam , Jerome Brunet , Martin Blumenstingl , Pengutronix Kernel Team , Baolin Wang , "Hans de Goede" , Alexandru Ardelean , Michael Hennerich , Haibo Chen , Lars-Peter Clausen , Jyoti Bhayana , Jonathan Cameron , Andy Shevchenko , Florian Boor , Chunyan Zhang , Orson Zhai , "Shawn Guo" , Kevin Hilman Subject: [PATCH v3 1/4] iio: core: introduce iio_device_{claim|release}_buffer_mode() APIs Date: Wed, 12 Oct 2022 17:16:17 +0200 Message-ID: <20221012151620.1725215-2-nuno.sa@analog.com> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221012151620.1725215-1-nuno.sa@analog.com> References: <20221012151620.1725215-1-nuno.sa@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: 8l2VOtgy2CDwMw-gbeV9x-u9BpQMGK02 X-Proofpoint-ORIG-GUID: 8l2VOtgy2CDwMw-gbeV9x-u9BpQMGK02 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-10-12_07,2022-10-12_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 phishscore=0 mlxlogscore=999 priorityscore=1501 spamscore=0 suspectscore=0 impostorscore=0 malwarescore=0 bulkscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2210120100 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..cf80f81e4665 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_buffer_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;