From patchwork Tue Jul 30 08:46:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Olivier Moysan X-Patchwork-Id: 13747057 Received: from mx07-00178001.pphosted.com (mx07-00178001.pphosted.com [185.132.182.106]) (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 84782193065; Tue, 30 Jul 2024 08:48:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.132.182.106 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722329328; cv=none; b=izmli8AZijIGz8Ddtm4TcZlUgztEQ+l2G6nMFID6Lai1fXHXwlRQF3TeJbEjxYE4eJ4ecC+clazabHMUBnPRhRfrFxBSQitDriEhRjT0qPZHUvBjQkECFWpdt6kJFEl0czGxSz5h2HzF3XtlhpaR0bBy8BATmKOjxa9ZvaE8CeU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722329328; c=relaxed/simple; bh=kBFneU6R49V+WQX1C3rXTq747w5qEc3IKhKihApmF4Y=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=uhxRxuBGuxMofWAjPVcaX+l9iFsikFlwh6IsqBv5x2uDubuloidyxdmiM8HDNRHu99bPWx41QkOiGWh7yFtr+mvSuoeLo91N0idhYMfQ+7WeaBuCM81nvqZxqQyI2uji+id1Wsa0jvswCYI3QtM1KKNhIOiJOc9oK9JXqoyC8N0= 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=XcKpCUkt; arc=none smtp.client-ip=185.132.182.106 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="XcKpCUkt" Received: from pps.filterd (m0369458.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 46U8Ib5B012747; Tue, 30 Jul 2024 10:48:17 +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= aLx2/9qybrXJ8bJcqI7xnqVCXKAknZa0c4mGUwESj2s=; b=XcKpCUktf8GzyunT 3u2OMafIAnlJQ/KlOiiU+43n4mekA0qfTUQSXwP+fFF8mGFWJp+MmMXvZNrAX+7g iN2dD9GD5EFPMpuLilHB9gu25njN+AAYLaRyZRSS7ec0O0+1LU4eMiDyXFxVRjm5 EEZ1s67X0yUyZMRc7f9LEcmNyNS3AxRDUXbCv0JdVl0iK7LGgOGR3agyXtRi0T6Q f8MlBA4XZt9DF8oS7ExXO/i+YlrljtvJU3c1jALX4WMIF1SYyGacdpqmNl9p1D+8 EeJSBHFrMBvgV7nW+DeMbbVRbVWN2iWwQlU02nVVP1do0KWN6NGIt/PZH4MYq3yW BTaguw== 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 40naf29dvt-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 30 Jul 2024 10:48:17 +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 219FD40044; Tue, 30 Jul 2024 10:48:07 +0200 (CEST) Received: from Webmail-eu.st.com (shfdag1node1.st.com [10.75.129.69]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id D542221F0A5; Tue, 30 Jul 2024 10:47:15 +0200 (CEST) Received: from localhost (10.252.3.32) 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 15.1.2507.37; Tue, 30 Jul 2024 10:47:15 +0200 From: Olivier Moysan To: , Nuno Sa , Olivier Moysan , Jonathan Cameron , Lars-Peter Clausen CC: , Subject: [PATCH v6 1/9] iio: add read scale and offset services to iio backend framework Date: Tue, 30 Jul 2024 10:46:31 +0200 Message-ID: <20240730084640.1307938-2-olivier.moysan@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240730084640.1307938-1-olivier.moysan@foss.st.com> References: <20240730084640.1307938-1-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: EQNCAS1NODE3.st.com (10.75.129.80) 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=2024-07-30_09,2024-07-26_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 | 19 +++++++++++++++++++ include/linux/iio/backend.h | 24 +++++++++++++++++++++++- 2 files changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index f9da635cdfea..72dc82a42d8f 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -361,6 +361,25 @@ int devm_iio_backend_request_buffer(struct device *dev, } EXPORT_SYMBOL_NS_GPL(devm_iio_backend_request_buffer, IIO_BACKEND); +/** + * iio_backend_read_raw - Read a channel attribute from a backend device. + * @back: Backend device + * @chan: IIO channel reference + * @val: First returned value + * @val2: Second returned value + * @mask: Specify the attribute to return + * + * RETURNS: + * 0 on success, negative error number on failure. + */ +int iio_backend_read_raw(struct iio_backend *back, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask) +{ + return iio_backend_op_call(back, read_raw, chan, val, val2, mask); +} +EXPORT_SYMBOL_NS_GPL(iio_backend_read_raw, 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 29c4cf0bd761..18b20426c25e 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -3,6 +3,7 @@ #define _IIO_BACKEND_H_ #include +#include struct iio_chan_spec; struct fwnode_handle; @@ -81,6 +82,7 @@ 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 +115,9 @@ 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 +146,9 @@ 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_raw(struct iio_backend *back, + struct iio_chan_spec const *chan, int *val, int *val2, + long mask); int iio_backend_extend_chan_spec(struct iio_backend *back, struct iio_chan_spec *chan); void *iio_backend_get_priv(const struct iio_backend *conv); @@ -153,4 +160,19 @@ __devm_iio_backend_get_from_fwnode_lookup(struct device *dev, int devm_iio_backend_register(struct device *dev, const struct iio_backend_ops *ops, void *priv); +static inline int iio_backend_read_scale(struct iio_backend *back, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + return iio_backend_read_raw(back, chan, val, val2, IIO_CHAN_INFO_SCALE); +} + +static inline int iio_backend_read_offset(struct iio_backend *back, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + return iio_backend_read_raw(back, chan, val, val2, + IIO_CHAN_INFO_OFFSET); +} + #endif