From patchwork Thu Jul 4 15:53:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Olivier Moysan X-Patchwork-Id: 13723965 Received: from mx07-00178001.pphosted.com (mx08-00178001.pphosted.com [91.207.212.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2F3DC1AD403; Thu, 4 Jul 2024 15:56:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.207.212.93 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720108598; cv=none; b=rxGDLtpKq+ihG5XsZuJGWtgzdAkHM3I2o7sqW5nQDBOL672Uh6NUml5d8dYQss16lbKBLp5DuqKspJEOv2mmxk1I+940OzjDVH2W416w9L+LMT3MXMBH9mte/hy0ZO1FnwNqOsQg0elAjUdldmHP8dDLFxlMqr/uTCQ23moYPPw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720108598; c=relaxed/simple; bh=53UhMXqkQ/FjSJYtW4+BEOnxpGdLmgdfKucfYdP67nM=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=k24vVUalB62IaBeta2I3k0PfwkHwroqqHYTutTvwhsuC3dCp5lnLI4f2iPI7ZV+yGP96ic4NPqRoQ1z0THjgp1Cr2NowkPTYDCUxZbihGBZIS8VW/RunuSyoKCE0M4ffLyS1rke0OR5Lzl0UZ/Jv6zxg8RT1p5idgQU2kkDzbiw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com; spf=pass smtp.mailfrom=foss.st.com; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b=LQM5sHRr; arc=none smtp.client-ip=91.207.212.93 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=foss.st.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=foss.st.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=foss.st.com header.i=@foss.st.com header.b="LQM5sHRr" Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 464BGSxE015863; Thu, 4 Jul 2024 17:56:17 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=selector1; bh= VWOXh5qERCLxblJ9Gwq00gOLdmVVQpKvvRh5HL52+lY=; b=LQM5sHRrmi3F3Yi7 HhwFvlLQ2YNeWaMgZf9A49AkLPEOiMM/lqFt2WXguSWBG9qzKj3q5epAGnOg3M3I sqnIZDuUovlgY3ly+2kd2d82Z4PiHfxNaNQLKw5P7/bj/YOMAzJ3XodkzxpxscdK ZccewLvUNH4baAqxPyIRW7xOjxS/JyUGBs6cmayRTlU3vYp1sUrGNxoq9SdrhPaI aClELI8FJ6JVbM+hAkN0q/nirQPVY2Q6pB5qERf5Do1IBBcXghXXLLa51I48N2tk MQtjFSL3VTP78odBte5r2zyI4eK7SKEwt4W+9bl8uum5AqmGcNRRvZR6pUgoHylV JNWbIw== Received: from beta.dmz-ap.st.com (beta.dmz-ap.st.com [138.198.100.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 4027d5nxqk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 04 Jul 2024 17:56:16 +0200 (MEST) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id 3E43F40049; Thu, 4 Jul 2024 17:56:07 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 72EB82291D1; Thu, 4 Jul 2024 17:55:45 +0200 (CEST) Received: from localhost (10.48.86.132) by SHFDAG1NODE1.st.com (10.75.129.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 4 Jul 2024 17:55:45 +0200 From: Olivier Moysan To: , Nuno Sa , Olivier Moysan , Jonathan Cameron , Lars-Peter Clausen CC: , Subject: [PATCH v4 1/8] iio: add read scale and offset services to iio backend framework Date: Thu, 4 Jul 2024 17:53:29 +0200 Message-ID: <20240704155338.2387858-2-olivier.moysan@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240704155338.2387858-1-olivier.moysan@foss.st.com> References: <20240704155338.2387858-1-olivier.moysan@foss.st.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: EQNCAS1NODE4.st.com (10.75.129.82) To SHFDAG1NODE1.st.com (10.75.129.69) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-04_10,2024-07-03_01,2024-05-17_01 Add iio_backend_read_scale() and iio_backend_read_offset() services to read channel scale and offset from an IIO backbend device. Also add a read_raw callback which replicates the read_raw callback of the IIO framework, and is intended to request miscellaneous channel attributes from the backend device. Both scale and offset helpers use this callback. Signed-off-by: Olivier Moysan Reviewed-by: Nuno Sa --- drivers/iio/industrialio-backend.c | 34 ++++++++++++++++++++++++++++++ include/linux/iio/backend.h | 9 +++++++- 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index efe05be284b6..4e0ff6e6e9d4 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -357,6 +357,40 @@ int devm_iio_backend_request_buffer(struct device *dev, } EXPORT_SYMBOL_NS_GPL(devm_iio_backend_request_buffer, IIO_BACKEND); +/** + * iio_backend_read_scale - Request channel scale from the IIO backend. + * @back: Backend device + * @chan: IIO channel reference + * @scale: returned scale value + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +int iio_backend_read_scale(struct iio_backend *back, + struct iio_chan_spec const *chan, int *scale) +{ + return iio_backend_op_call(back, read_raw, chan, scale, NULL, + IIO_CHAN_INFO_SCALE); +} +EXPORT_SYMBOL_NS_GPL(iio_backend_read_scale, IIO_BACKEND); + +/** + * iio_backend_read_offset - Request channel offset from the IIO backend. + * @back: Backend device + * @chan: IIO channel reference + * @offset: returned offset value + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +int iio_backend_read_offset(struct iio_backend *back, + struct iio_chan_spec const *chan, int *offset) +{ + return iio_backend_op_call(back, read_raw, chan, offset, NULL, + IIO_CHAN_INFO_OFFSET); +} +EXPORT_SYMBOL_NS_GPL(iio_backend_read_offset, IIO_BACKEND); + static struct iio_backend *iio_backend_from_indio_dev_parent(const struct device *dev) { struct iio_backend *back = ERR_PTR(-ENODEV), *iter; diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index 8099759d7242..2d80e3fa58ce 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -81,6 +81,7 @@ enum iio_backend_sample_trigger { * @extend_chan_spec: Extend an IIO channel. * @ext_info_set: Extended info setter. * @ext_info_get: Extended info getter. + * @read_raw: Read a channel attribute from a backend device **/ struct iio_backend_ops { int (*enable)(struct iio_backend *back); @@ -113,6 +114,9 @@ struct iio_backend_ops { const char *buf, size_t len); int (*ext_info_get)(struct iio_backend *back, uintptr_t private, const struct iio_chan_spec *chan, char *buf); + int (*read_raw)(struct iio_backend *back, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask); }; int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan); @@ -141,7 +145,10 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private, const char *buf, size_t len); ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf); - +int iio_backend_read_scale(struct iio_backend *back, + struct iio_chan_spec const *chan, int *scale); +int iio_backend_read_offset(struct iio_backend *back, + struct iio_chan_spec const *chan, int *offset); int iio_backend_extend_chan_spec(struct iio_dev *indio_dev, struct iio_backend *back, struct iio_chan_spec *chan);