From patchwork Tue Nov 17 16:23:39 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 11912707 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=-14.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 14D90C56202 for ; Tue, 17 Nov 2020 16:19:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8B14208CA for ; Tue, 17 Nov 2020 16:19:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727849AbgKQQTA (ORCPT ); Tue, 17 Nov 2020 11:19:00 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:30944 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727814AbgKQQS7 (ORCPT ); Tue, 17 Nov 2020 11:18:59 -0500 Received: from pps.filterd (m0167088.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0AHGEVB8001210; Tue, 17 Nov 2020 11:18:46 -0500 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com with ESMTP id 34t9ybjdh2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Nov 2020 11:18:46 -0500 Received: from SCSQMBX11.ad.analog.com (SCSQMBX11.ad.analog.com [10.77.17.10]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 0AHGIih1044687 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Tue, 17 Nov 2020 11:18:44 -0500 Received: from SCSQMBX11.ad.analog.com (10.77.17.10) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1779.2; Tue, 17 Nov 2020 08:18:43 -0800 Received: from zeus.spd.analog.com (10.66.68.11) by SCSQMBX11.ad.analog.com (10.77.17.10) with Microsoft SMTP Server id 15.1.1779.2 via Frontend Transport; Tue, 17 Nov 2020 08:18:42 -0800 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 0AHGIRTX032565; Tue, 17 Nov 2020 11:18:41 -0500 From: Alexandru Ardelean To: , CC: , , Alexandru Ardelean Subject: [RFC PATCH 11/12] iio: buffer: introduce support for attaching more IIO buffers Date: Tue, 17 Nov 2020 18:23:39 +0200 Message-ID: <20201117162340.43924-12-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201117162340.43924-1-alexandru.ardelean@analog.com> References: <20201117162340.43924-1-alexandru.ardelean@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-17_06:2020-11-17,2020-11-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxscore=0 priorityscore=1501 suspectscore=2 impostorscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 spamscore=0 adultscore=0 mlxlogscore=999 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011170117 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org With this change, calling iio_device_attach_buffer() will actually attach more buffers. Right now this doesn't do any validation of whether a buffer is attached twice; maybe that can be added later (if needed). Attaching a buffer more than once should yield noticeably bad results. The first buffer is the legacy buffer, so a reference is kept to it. At this point, accessing the data for the extra buffers (that are added after the first one) isn't possible yet. Signed-off-by: Alexandru Ardelean --- drivers/iio/industrialio-buffer.c | 58 +++++++++++++++++++++++++------ include/linux/iio/buffer_impl.h | 3 ++ include/linux/iio/iio-opaque.h | 4 +++ 3 files changed, 54 insertions(+), 11 deletions(-) diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index c83cec89eddf..daa68822cea7 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -1513,6 +1513,7 @@ static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer); int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) { + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); struct iio_buffer *buffer = indio_dev->buffer; const struct iio_chan_spec *channels; int i, ret; @@ -1529,15 +1530,18 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) if (!buffer) return 0; - ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, 0); - if (ret) - return ret; + for (i = 0; i < iio_dev_opaque->attached_buffers_cnt; i++) { + buffer = iio_dev_opaque->attached_buffers[i]; + ret = __iio_buffer_alloc_sysfs_and_mask(buffer, indio_dev, i); + if (ret) + goto error_unwind_sysfs_and_mask; + } ret = sysfs_create_link(&indio_dev->dev.kobj, &indio_dev->buffer->buffer_dir, "buffer"); if (ret) - goto error_free_sysfs_and_mask; + goto error_unwind_sysfs_and_mask; ret = sysfs_create_link(&indio_dev->dev.kobj, &indio_dev->buffer->scan_el_dir, @@ -1549,8 +1553,14 @@ int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) error_remove_buffer_dir_link: sysfs_remove_link(&indio_dev->dev.kobj, "buffer"); -error_free_sysfs_and_mask: - __iio_buffer_free_sysfs_and_mask(buffer); + i = iio_dev_opaque->attached_buffers_cnt - 1; +error_unwind_sysfs_and_mask: + for (; i >= 0; i--) { + buffer = iio_dev_opaque->attached_buffers[i]; + __iio_buffer_free_sysfs_and_mask(buffer); + } + kfree(iio_dev_opaque->attached_buffers); + iio_dev_opaque->attached_buffers = NULL; return ret; } @@ -1568,7 +1578,9 @@ static void __iio_buffer_free_sysfs_and_mask(struct iio_buffer *buffer) void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) { + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); struct iio_buffer *buffer = indio_dev->buffer; + int i; if (!buffer) return; @@ -1576,7 +1588,13 @@ void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) sysfs_remove_link(&indio_dev->dev.kobj, "scan_elements"); sysfs_remove_link(&indio_dev->dev.kobj, "buffer"); - __iio_buffer_free_sysfs_and_mask(buffer); + for (i = iio_dev_opaque->attached_buffers_cnt - 1; i >= 0; i--) { + buffer = iio_dev_opaque->attached_buffers[i]; + __iio_buffer_free_sysfs_and_mask(buffer); + } + + kfree(iio_dev_opaque->attached_buffers); + iio_dev_opaque->attached_buffers = NULL; } /** @@ -1709,14 +1727,32 @@ EXPORT_SYMBOL_GPL(iio_buffer_get_iio_dev); * @buffer: The buffer to attach to the device * * This function attaches a buffer to a IIO device. The buffer stays attached to - * the device until the device is freed. The function should only be called at - * most once per device. + * the device until the device is freed. For legacy reasons, the first attached + * buffer will also be assigned to 'indio_dev->buffer'. */ void iio_device_attach_buffer(struct iio_dev *indio_dev, struct iio_buffer *buffer) { - indio_dev->buffer = iio_buffer_get(buffer); + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + struct iio_buffer **new, **old = iio_dev_opaque->attached_buffers; + unsigned int cnt = iio_dev_opaque->attached_buffers_cnt; + + cnt++; + + new = krealloc(old, sizeof(*new) * cnt, GFP_KERNEL); + if (!new) { + kfree(old); + return; + } + iio_dev_opaque->attached_buffers = new; + + /* first buffer is legacy; attach it to the IIO device directly */ + if (!indio_dev->buffer) + indio_dev->buffer = iio_buffer_get(buffer); + + buffer->indio_dev = indio_dev; - indio_dev->buffer->indio_dev = indio_dev; + iio_dev_opaque->attached_buffers[cnt - 1] = buffer; + iio_dev_opaque->attached_buffers_cnt = cnt; } EXPORT_SYMBOL_GPL(iio_device_attach_buffer); diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h index 77e169e51434..e25d26a7f601 100644 --- a/include/linux/iio/buffer_impl.h +++ b/include/linux/iio/buffer_impl.h @@ -124,6 +124,9 @@ struct iio_buffer { /* @demux_bounce: Buffer for doing gather from incoming scan. */ void *demux_bounce; + /* @attached_entry: Entry in the devices list of buffers attached by the driver. */ + struct list_head attached_entry; + /* @buffer_list: Entry in the devices list of current buffers. */ struct list_head buffer_list; diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h index 07c5a8e52ca8..1db0ea09520e 100644 --- a/include/linux/iio/iio-opaque.h +++ b/include/linux/iio/iio-opaque.h @@ -7,6 +7,8 @@ * struct iio_dev_opaque - industrial I/O device opaque information * @indio_dev: public industrial I/O device information * @event_interface: event chrdevs associated with interrupt lines + * @attached_buffers: array of buffers statically attached by the driver + * @attached_buffers_cnt: number of buffers in the array of statically attached buffers * @buffer_list: list of all buffers currently attached * @channel_attr_list: keep track of automatically created channel * attributes @@ -20,6 +22,8 @@ struct iio_dev_opaque { struct iio_dev indio_dev; struct iio_event_interface *event_interface; + struct iio_buffer **attached_buffers; + unsigned int attached_buffers_cnt; struct list_head buffer_list; struct list_head channel_attr_list; struct attribute_group chan_attr_group;