From patchwork Fri Feb 12 10:20:18 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandru Ardelean X-Patchwork-Id: 12084981 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 B9C4FC433E9 for ; Fri, 12 Feb 2021 10:19:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A08864D9E for ; Fri, 12 Feb 2021 10:19:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230374AbhBLKTE (ORCPT ); Fri, 12 Feb 2021 05:19:04 -0500 Received: from mx0a-00128a01.pphosted.com ([148.163.135.77]:1830 "EHLO mx0a-00128a01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230389AbhBLKS5 (ORCPT ); Fri, 12 Feb 2021 05:18:57 -0500 Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 11CAFO8k001788; Fri, 12 Feb 2021 05:18:05 -0500 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com with ESMTP id 36hrw93ca8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 12 Feb 2021 05:18:05 -0500 Received: from SCSQMBX11.ad.analog.com (SCSQMBX11.ad.analog.com [10.77.17.10]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 11CAI3bB023449 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Fri, 12 Feb 2021 05:18:04 -0500 Received: from SCSQCASHYB7.ad.analog.com (10.77.17.133) 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; Fri, 12 Feb 2021 02:18:02 -0800 Received: from SCSQMBX10.ad.analog.com (10.77.17.5) by SCSQCASHYB7.ad.analog.com (10.77.17.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.721.2; Fri, 12 Feb 2021 02:18:02 -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; Fri, 12 Feb 2021 02:18:02 -0800 Received: from localhost.localdomain ([10.48.65.12]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 11CAHu5l029319; Fri, 12 Feb 2021 05:17:59 -0500 From: Alexandru Ardelean To: , CC: , , , , , Alexandru Ardelean Subject: [RFC PATCH 2/5] iio: kfifo-buffer: Add output buffer support Date: Fri, 12 Feb 2021 12:20:18 +0200 Message-ID: <20210212102021.47276-3-alexandru.ardelean@analog.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210212102021.47276-1-alexandru.ardelean@analog.com> References: <20210212102021.47276-1-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=2021-02-12_03:2021-02-12,2021-02-12 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 clxscore=1015 adultscore=0 priorityscore=1501 bulkscore=0 mlxscore=0 phishscore=0 suspectscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2102120077 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org From: Lars-Peter Clausen Add output buffer support to the kfifo buffer implementation. The implementation is straight forward and mostly just wraps the kfifo API to provide the required operations. Signed-off-by: Lars-Peter Clausen Signed-off-by: Alexandru Ardelean --- drivers/iio/buffer/kfifo_buf.c | 50 ++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/drivers/iio/buffer/kfifo_buf.c b/drivers/iio/buffer/kfifo_buf.c index 1359abed3b31..6e055176f969 100644 --- a/drivers/iio/buffer/kfifo_buf.c +++ b/drivers/iio/buffer/kfifo_buf.c @@ -138,10 +138,60 @@ static void iio_kfifo_buffer_release(struct iio_buffer *buffer) kfree(kf); } +static size_t iio_kfifo_buf_space_available(struct iio_buffer *r) +{ + struct iio_kfifo *kf = iio_to_kfifo(r); + size_t avail; + + mutex_lock(&kf->user_lock); + avail = kfifo_avail(&kf->kf); + mutex_unlock(&kf->user_lock); + + return avail; +} + +static int iio_kfifo_remove_from(struct iio_buffer *r, void *data) +{ + int ret; + struct iio_kfifo *kf = iio_to_kfifo(r); + + if (kfifo_size(&kf->kf) < r->bytes_per_datum) + return -EBUSY; + + ret = kfifo_out(&kf->kf, data, r->bytes_per_datum); + if (ret != r->bytes_per_datum) + return -EBUSY; + + wake_up_interruptible_poll(&r->pollq, POLLOUT | POLLWRNORM); + + return 0; +} + +static int iio_kfifo_write(struct iio_buffer *r, size_t n, + const char __user *buf) +{ + struct iio_kfifo *kf = iio_to_kfifo(r); + int ret, copied; + + mutex_lock(&kf->user_lock); + if (!kfifo_initialized(&kf->kf) || n < kfifo_esize(&kf->kf)) + ret = -EINVAL; + else + ret = kfifo_from_user(&kf->kf, buf, n, &copied); + mutex_unlock(&kf->user_lock); + if (ret) + return ret; + + return copied; +} + static const struct iio_buffer_access_funcs kfifo_access_funcs = { .store_to = &iio_store_to_kfifo, .read = &iio_read_kfifo, .data_available = iio_kfifo_buf_data_available, + .remove_from = &iio_kfifo_remove_from, + .write = &iio_kfifo_write, + .space_available = &iio_kfifo_buf_space_available, .request_update = &iio_request_update_kfifo, .set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo, .set_length = &iio_set_length_kfifo,