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Fri, 7 Feb 2025 09:09:50 -0500 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) 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, 7 Feb 2025 09:09:49 -0500 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Fri, 7 Feb 2025 09:09:49 -0500 Received: from amiclaus-VirtualBox.ad.analog.com (AMICLAUS-L02.ad.analog.com [10.48.65.147]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 517E9a4o015095; Fri, 7 Feb 2025 09:09:43 -0500 From: Antoniu Miclaus To: , , , , , , CC: Antoniu Miclaus , Nuno Sa , David Lechner Subject: [PATCH v12 2/9] iio: backend: add support for data size set Date: Fri, 7 Feb 2025 16:09:11 +0200 Message-ID: <20250207140918.7814-3-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250207140918.7814-1-antoniu.miclaus@analog.com> References: <20250207140918.7814-1-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-Authority-Analysis: v=2.4 cv=Bdgi0qt2 c=1 sm=1 tr=0 ts=67a6142f cx=c_pps a=PpDZqlmH/M8setHirZLBMw==:117 a=PpDZqlmH/M8setHirZLBMw==:17 a=T2h4t0Lz3GQA:10 a=gAnH3GRIAAAA:8 a=IpJZQVW2AAAA:8 a=JY5jBUxdzKL8h0s2lDQA:9 a=oVHKYsEdi7-vN-J5QA_j:22 a=IawgGOuG5U0WyFbmm1f5:22 X-Proofpoint-ORIG-GUID: pj4rJDQJ0eiW9cgHZI-ZqWSTJWwirRSh X-Proofpoint-GUID: pj4rJDQJ0eiW9cgHZI-ZqWSTJWwirRSh X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-07_06,2025-02-07_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 suspectscore=0 adultscore=0 phishscore=0 priorityscore=1501 mlxlogscore=999 clxscore=1015 spamscore=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502070108 Add backend support for setting the data size used. This setting can be adjusted within the IP cores interfacing devices. Reviewed-by: Nuno Sa Reviewed-by: David Lechner Signed-off-by: Antoniu Miclaus --- no changes in v12. 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 8bf3d570da1b..2088afa7a55c 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -660,6 +660,27 @@ 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. + */ +int iio_backend_data_size_set(struct iio_backend *back, unsigned int 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 * @back: Backend device diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index a0ea6c29d7ba..9ae861a21472 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -95,6 +95,7 @@ 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. * @read_raw: Read a channel attribute from a backend device * @debugfs_print_chan_status: Print channel status into a buffer. * @debugfs_reg_access: Read or write register value of backend. @@ -137,6 +138,7 @@ 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, unsigned int size); int (*read_raw)(struct iio_backend *back, struct iio_chan_spec const *chan, int *val, int *val2, long mask); @@ -197,6 +199,7 @@ 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_interface_type_get(struct iio_backend *back, enum iio_backend_interface_type *type); +int iio_backend_data_size_set(struct iio_backend *back, unsigned int size); int iio_backend_read_raw(struct iio_backend *back, struct iio_chan_spec const *chan, int *val, int *val2, long mask);