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Fri, 4 Oct 2024 10:11:27 -0400 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Fri, 4 Oct 2024 10:11:27 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Fri, 4 Oct 2024 10:11:27 -0400 Received: from amiclaus-VirtualBox.ad.analog.com (AMICLAUS-L02.ad.analog.com [10.48.65.173]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 494EAps2001773; Fri, 4 Oct 2024 10:11:22 -0400 From: Antoniu Miclaus To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Nuno Sa , Olivier Moysan , =?utf-8?q?Uwe_Kleine-K=C3=B6ni?= =?utf-8?q?g?= , Andy Shevchenko , David Lechner , Marcelo Schmitt , Dumitru Ceclan , Ivan Mikhaylov , =?utf-8?q?Jo=C3=A3o_Paulo_Gon=C3=A7al?= =?utf-8?q?ves?= , Antoniu Miclaus , Alisa-Dariana Roman , AngeloGioacchino Del Regno , Sergiu Cuciurean , Dragos Bogdan , , , , Subject: [PATCH v2 2/7] iio: backend: add support for data size set Date: Fri, 4 Oct 2024 17:07:51 +0300 Message-ID: <20241004140922.233939-2-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241004140922.233939-1-antoniu.miclaus@analog.com> References: <20241004140922.233939-1-antoniu.miclaus@analog.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-ORIG-GUID: EK3j5HJaKfdu_yTI2tGB9T8kPO5xEmw6 X-Proofpoint-GUID: EK3j5HJaKfdu_yTI2tGB9T8kPO5xEmw6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 impostorscore=0 mlxscore=0 phishscore=0 adultscore=0 clxscore=1015 mlxlogscore=999 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410040099 Add backend support for setting the data size used. This setting can be adjusted within the IP cores interfacing devices. Signed-off-by: Antoniu Miclaus --- changes in v2: - use Return: instead of RETURN. - use size_t instead of ssize_t - improve commit message. drivers/iio/industrialio-backend.c | 21 +++++++++++++++++++++ include/linux/iio/backend.h | 3 +++ 2 files changed, 24 insertions(+) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c index a322b0be7b2c..9aaa90ed1274 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -473,6 +473,27 @@ int iio_backend_interface_type_get(struct iio_backend *back, } EXPORT_SYMBOL_NS_GPL(iio_backend_interface_type_get, IIO_BACKEND); +/** + * iio_backend_data_size_set - set the data width/size in the data bus. + * @back: Backend device + * @size: Size in bits + * + * Some frontend devices can dynamically control the word/data size on the + * interface/data bus. Hence, the backend device needs to be aware of it so + * data can be correctly transferred. + * + * Return: + * 0 on success, negative error number on failure. + */ +size_t iio_backend_data_size_set(struct iio_backend *back, size_t size) +{ + if (!size) + return -EINVAL; + + return iio_backend_op_call(back, data_size_set, size); +} +EXPORT_SYMBOL_NS_GPL(iio_backend_data_size_set, IIO_BACKEND); + /** * iio_backend_extend_chan_spec - Extend an IIO channel * @indio_dev: IIO device diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index 34fc76c99d8a..18e571a24251 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -88,6 +88,7 @@ enum iio_backend_interface_type { * @ext_info_set: Extended info setter. * @ext_info_get: Extended info getter. * @interface_type_get: Interface type. + * @data_size_set: Data size. **/ struct iio_backend_ops { int (*enable)(struct iio_backend *back); @@ -122,6 +123,7 @@ struct iio_backend_ops { const struct iio_chan_spec *chan, char *buf); int (*interface_type_get)(struct iio_backend *back, enum iio_backend_interface_type *type); + int (*data_size_set)(struct iio_backend *back, ssize_t size); }; int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan); @@ -153,6 +155,7 @@ ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private, int iio_backend_interface_type_get(struct iio_backend *back, enum iio_backend_interface_type *type); +size_t iio_backend_data_size_set(struct iio_backend *back, size_t size); int iio_backend_extend_chan_spec(struct iio_dev *indio_dev, struct iio_backend *back, struct iio_chan_spec *chan);