From patchwork Thu Feb 11 12:24:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 12083013 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=-16.7 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=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 B31BEC4332B for ; Thu, 11 Feb 2021 12:26:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 716E864E9A for ; Thu, 11 Feb 2021 12:26:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230470AbhBKMZv (ORCPT ); Thu, 11 Feb 2021 07:25:51 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:17540 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231956AbhBKMXl (ORCPT ); Thu, 11 Feb 2021 07:23:41 -0500 Received: from pps.filterd (m0167088.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 11BCMj8l016267; Thu, 11 Feb 2021 07:22:48 -0500 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com with ESMTP id 36hr7qg8vk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 11 Feb 2021 07:22:47 -0500 Received: from SCSQMBX10.ad.analog.com (SCSQMBX10.ad.analog.com [10.77.17.5]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 11BCMkQd004248 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 11 Feb 2021 07:22:46 -0500 Received: from SCSQMBX10.ad.analog.com (10.77.17.5) by SCSQMBX10.ad.analog.com (10.77.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.721.2; Thu, 11 Feb 2021 04:22:45 -0800 Received: from zeus.spd.analog.com (10.66.68.11) by scsqmbx10.ad.analog.com (10.77.17.5) with Microsoft SMTP Server id 15.2.721.2 via Frontend Transport; Thu, 11 Feb 2021 04:22:45 -0800 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 11BCMYWc011557; Thu, 11 Feb 2021 07:22:42 -0500 From: Alexandru Ardelean To: , CC: , , , , , , , Alexandru Ardelean Subject: [PATCH v5 04/17] iio: core: rework iio device group creation Date: Thu, 11 Feb 2021 14:24:39 +0200 Message-ID: <20210211122452.78106-5-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210211122452.78106-1-alexandru.ardelean@analog.com> References: <20210211122452.78106-1-alexandru.ardelean@analog.com> MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.737 definitions=2021-02-11_05:2021-02-10,2021-02-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 lowpriorityscore=0 malwarescore=0 clxscore=1015 spamscore=0 phishscore=0 suspectscore=0 mlxscore=0 bulkscore=0 priorityscore=1501 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102110110 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Up until now, the device groups that an IIO device had were limited to 6. Two of these groups would account for buffer attributes (the buffer/ and scan_elements/ directories). Since we want to add multiple buffers per IIO device, this number may not be enough, when adding a second buffer. So, this change reallocates the groups array whenever an IIO device group is added, via a iio_device_register_sysfs_group() helper. This also means that the groups array should be assigned to 'indio_dev.dev.groups' really late, right before {cdev_}device_add() is called to do the entire setup. And we also must take care to free this array when the sysfs resources are being cleaned up. With this change we can also move the 'groups' & 'groupcounter' fields to the iio_dev_opaque object. Up until now, this didn't make a whole lot of sense (especially since we weren't sure how multibuffer support would look like in the end). But doing it now kills one birds with one stone. An alternative, would be to add a configurable Kconfig symbol CONFIG_IIO_MAX_BUFFERS_PER_DEVICE (or something like that) and compute a static maximum of the groups we can support per IIO device. But that would probably annoy a few people since that would make the system less configurable. Signed-off-by: Alexandru Ardelean --- drivers/iio/iio_core.h | 3 +++ drivers/iio/industrialio-buffer.c | 12 ++++++++++-- drivers/iio/industrialio-core.c | 30 +++++++++++++++++++++++++++--- drivers/iio/industrialio-event.c | 5 ++++- drivers/iio/industrialio-trigger.c | 6 ++---- include/linux/iio/iio-opaque.h | 4 ++++ include/linux/iio/iio.h | 5 ----- 7 files changed, 50 insertions(+), 15 deletions(-) diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h index fced02cadcc3..7d5b179c1fe7 100644 --- a/drivers/iio/iio_core.h +++ b/drivers/iio/iio_core.h @@ -46,6 +46,9 @@ int __iio_add_chan_devattr(const char *postfix, struct list_head *attr_list); void iio_free_chan_devattr_list(struct list_head *attr_list); +int iio_device_register_sysfs_group(struct iio_dev *indio_dev, + const struct attribute_group *group); + ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals); /* Event interface flags */ diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 2f7426a2f47c..cc846988fdb9 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -1287,7 +1287,9 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer, buffer->buffer_group.name = "buffer"; buffer->buffer_group.attrs = attr; - indio_dev->groups[indio_dev->groupcounter++] = &buffer->buffer_group; + ret = iio_device_register_sysfs_group(indio_dev, &buffer->buffer_group); + if (ret) + goto error_free_buffer_attrs; attrcount = 0; INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); @@ -1330,14 +1332,20 @@ static int __iio_buffer_alloc_sysfs_and_mask(struct iio_buffer *buffer, list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; - indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; + + ret = iio_device_register_sysfs_group(indio_dev, &buffer->scan_el_group); + if (ret) + goto error_free_scan_el_attrs; return 0; +error_free_scan_el_attrs: + kfree(buffer->scan_el_group.attrs); error_free_scan_mask: bitmap_free(buffer->scan_mask); error_cleanup_dynamic: iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list); +error_free_buffer_attrs: kfree(buffer->buffer_group.attrs); return ret; diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 0a6fd299a978..2db460ac30b2 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -1452,6 +1452,25 @@ static ssize_t iio_store_timestamp_clock(struct device *dev, return len; } +int iio_device_register_sysfs_group(struct iio_dev *indio_dev, + const struct attribute_group *group) +{ + struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); + const struct attribute_group **new, **old = iio_dev_opaque->groups; + unsigned int cnt = iio_dev_opaque->groupcounter; + + new = krealloc(old, sizeof(*new) * (cnt + 2), GFP_KERNEL); + if (!new) + return -ENOMEM; + + new[iio_dev_opaque->groupcounter++] = group; + new[iio_dev_opaque->groupcounter] = NULL; + + iio_dev_opaque->groups = new; + + return 0; +} + static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, iio_show_timestamp_clock, iio_store_timestamp_clock); @@ -1525,8 +1544,10 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev) if (clk) iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk; - indio_dev->groups[indio_dev->groupcounter++] = - &iio_dev_opaque->chan_attr_group; + ret = iio_device_register_sysfs_group(indio_dev, + &iio_dev_opaque->chan_attr_group); + if (ret) + goto error_clear_attrs; return 0; @@ -1543,6 +1564,7 @@ static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) iio_free_chan_devattr_list(&iio_dev_opaque->channel_attr_list); kfree(iio_dev_opaque->chan_attr_group.attrs); iio_dev_opaque->chan_attr_group.attrs = NULL; + kfree(iio_dev_opaque->groups); } static void iio_dev_release(struct device *device) @@ -1592,7 +1614,6 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv) ALIGN(sizeof(struct iio_dev_opaque), IIO_ALIGN); dev->dev.parent = parent; - dev->dev.groups = dev->groups; dev->dev.type = &iio_device_type; dev->dev.bus = &iio_bus_type; device_initialize(&dev->dev); @@ -1853,6 +1874,9 @@ int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) indio_dev->chrdev.owner = this_mod; } + /* assign device groups now; they should be all registered now */ + indio_dev->dev.groups = iio_dev_opaque->groups; + ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev); if (ret < 0) goto error_unreg_eventset; diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c index 7e532117ac55..ea8947cc21e4 100644 --- a/drivers/iio/industrialio-event.c +++ b/drivers/iio/industrialio-event.c @@ -544,7 +544,10 @@ int iio_device_register_eventset(struct iio_dev *indio_dev) /* Add all elements from the list. */ list_for_each_entry(p, &ev_int->dev_attr_list, l) ev_int->group.attrs[attrn++] = &p->dev_attr.attr; - indio_dev->groups[indio_dev->groupcounter++] = &ev_int->group; + + ret = iio_device_register_sysfs_group(indio_dev, &ev_int->group); + if (ret) + goto error_free_setup_event_lines; ev_int->ioctl_handler.ioctl = iio_event_ioctl; iio_device_ioctl_handler_register(&iio_dev_opaque->indio_dev, diff --git a/drivers/iio/industrialio-trigger.c b/drivers/iio/industrialio-trigger.c index 438d5012e8b8..a035d5c2a445 100644 --- a/drivers/iio/industrialio-trigger.c +++ b/drivers/iio/industrialio-trigger.c @@ -694,10 +694,8 @@ EXPORT_SYMBOL(iio_trigger_validate_own_device); int iio_device_register_trigger_consumer(struct iio_dev *indio_dev) { - indio_dev->groups[indio_dev->groupcounter++] = - &iio_trigger_consumer_attr_group; - - return 0; + return iio_device_register_sysfs_group(indio_dev, + &iio_trigger_consumer_attr_group); } void iio_device_unregister_trigger_consumer(struct iio_dev *indio_dev) diff --git a/include/linux/iio/iio-opaque.h b/include/linux/iio/iio-opaque.h index 07c5a8e52ca8..8ba13a5c7af6 100644 --- a/include/linux/iio/iio-opaque.h +++ b/include/linux/iio/iio-opaque.h @@ -12,6 +12,8 @@ * attributes * @chan_attr_group: group for all attrs in base directory * @ioctl_handlers: ioctl handlers registered with the core handler + * @groups: attribute groups + * @groupcounter: index of next attribute group * @debugfs_dentry: device specific debugfs dentry * @cached_reg_addr: cached register address for debugfs reads * @read_buf: read buffer to be used for the initial reg read @@ -24,6 +26,8 @@ struct iio_dev_opaque { struct list_head channel_attr_list; struct attribute_group chan_attr_group; struct list_head ioctl_handlers; + const struct attribute_group **groups; + int groupcounter; #if defined(CONFIG_DEBUG_FS) struct dentry *debugfs_dentry; unsigned cached_reg_addr; diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index e4a9822e6495..f8585d01fc76 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -518,8 +518,6 @@ struct iio_buffer_setup_ops { * @setup_ops: [DRIVER] callbacks to call before and after buffer * enable/disable * @chrdev: [INTERN] associated character device - * @groups: [INTERN] attribute groups - * @groupcounter: [INTERN] index of next attribute group * @flags: [INTERN] file ops related flags including busy flag. * @priv: [DRIVER] reference to driver's private information * **MUST** be accessed **ONLY** via iio_priv() helper @@ -556,9 +554,6 @@ struct iio_dev { struct mutex info_exist_lock; const struct iio_buffer_setup_ops *setup_ops; struct cdev chrdev; -#define IIO_MAX_GROUPS 6 - const struct attribute_group *groups[IIO_MAX_GROUPS + 1]; - int groupcounter; unsigned long flags; void *priv;