From patchwork Wed Jul 3 16:05:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Olivier MOYSAN X-Patchwork-Id: 13722510 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 301911DA319; Wed, 3 Jul 2024 16:07:16 +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=1720022839; cv=none; b=hQd4Vv/2PVAWm/4O6rk9urEBjJPrHD2ZYoQlAXpmBYrq5YGhtGT2BjaIMZESNtz3H7k7nGeaJHWqgYvd2QORIbA/MXbi/T72Clgs7yaZx10AMN2GuuuccWLUlfeVZC9Wtkz4l75ajkN1CX4HRM6xFE3724Pbh9T/A9IxQbnn87I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720022839; c=relaxed/simple; bh=b32uMbHJRioj9Wf15d+fPKFlLAY/ggKIOmf3FCwjO5U=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=XEb44dWehhZlAnJSXhsUYxQ9VyPsLVAiwevfYis85fcW9GAAGsJyweeZjlxJov/v5wqNbgwCmb62yIoBMhX6lvuuFbgKCK14Lleynhol6W8vJ6dl6GJ5K8Y1WVLw8zAimahq9LJCv2Z3lFujiv6pZIL7/tiVOWHO9bOeC6wvgeY= 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=iUpXrzuQ; 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="iUpXrzuQ" 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 463CDJRq008071; Wed, 3 Jul 2024 18:06:57 +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= Psk24RBOT5eCcIxnsVH9xv3gXfaRnxUEXqXZJXM/8AI=; b=iUpXrzuQDxUmNWv+ zWTpuAGoU6x/45y6JUA0LEM8W4FxvndAcozBk2Dtbzzq5AMkbg8KX3UNoqhy05xX ycC/WU7T4Zd3s4wX0QpZvyyxWHcZjdHW6Cvx2yMrZsdJMyEyCGW0+HWfIzYNh8ws MwxWJR4+LwFPzilkHkBa1iCySovP7Eu+gBT2hVMzkDCjuUd3S/NzqzXRqCisoesu kj+qNnWfYDuQg0SNARLH0v1WdsmBMQ3VhqSdXipxz29nF+34zwIGmhTe/nj4kY5m gNLog8U4AFVpHcaZwKarumtNhtoSqtfPYnlX7S/Kvu9Ceu/IBLjesg4LaZkingVq jxqOGA== 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 4027d5hq0a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 03 Jul 2024 18:06:57 +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 D8C5240046; Wed, 3 Jul 2024 18:06:47 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 088672291A9; Wed, 3 Jul 2024 18:06:27 +0200 (CEST) Received: from localhost (10.252.27.110) 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; Wed, 3 Jul 2024 18:06:26 +0200 From: Olivier Moysan To: Nuno Sa , Olivier Moysan , Jonathan Cameron , Lars-Peter Clausen CC: , Subject: [PATCH v3 1/8] iio: add read scale and offset services to iio backend framework Date: Wed, 3 Jul 2024 18:05:26 +0200 Message-ID: <20240703160535.2277871-2-olivier.moysan@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240703160535.2277871-1-olivier.moysan@foss.st.com> References: <20240703160535.2277871-1-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: SHFCAS1NODE2.st.com (10.75.129.73) 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=2024-07-03_11,2024-07-03_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 | 30 ++++++++++++++++++++++++++++++ include/linux/iio/backend.h | 7 ++++++- 2 files changed, 36 insertions(+), 1 deletion(-) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index efe05be284b6..1d3d6dbdcc4e 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -357,6 +357,36 @@ 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, 0, 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, 0, 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..cbad233ae9f2 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 +114,8 @@ 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 +144,9 @@ 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);