linux-kernel - [PATCH 2/7] iio: backend: add support for data size set

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Message-ID: <20240923101206.3753-3-antoniu.miclaus@analog.com>
Date: Mon, 23 Sep 2024 13:10:19 +0300
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>, Nuno Sa <nuno.sa@...log.com>,
        Olivier Moysan
	<olivier.moysan@...s.st.com>,
        Uwe Kleine-König
	<ukleinek@...nel.org>,
        Andy Shevchenko <andy@...nel.org>,
        David Lechner
	<dlechner@...libre.com>,
        Marcelo Schmitt <marcelo.schmitt@...log.com>,
        João Paulo Gonçalves <joao.goncalves@...adex.com>,
        Dumitru Ceclan <mitrutzceclan@...il.com>,
        AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>,
        Antoniu Miclaus
	<antoniu.miclaus@...log.com>,
        Alisa-Dariana Roman <alisadariana@...il.com>,
        Marius Cristea <marius.cristea@...rochip.com>,
        Sergiu Cuciurean
	<sergiu.cuciurean@...log.com>,
        Dragos Bogdan <dragos.bogdan@...log.com>, <linux-iio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-pwm@...r.kernel.org>
Subject: [PATCH 2/7] iio: backend: add support for data size set

Add backend support for setting the data size used.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
 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 53ab6bc86a50..a6a6bedce7f1 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.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+ssize_t iio_backend_data_size_set(struct iio_backend *back, ssize_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 ba8ad30ac9ba..85b33ed69cc0 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -87,6 +87,7 @@ 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);
@@ -121,6 +122,7 @@ 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);
@@ -152,6 +154,7 @@ 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);
+ssize_t iio_backend_data_size_set(struct iio_backend *back, ssize_t size);
 int iio_backend_extend_chan_spec(struct iio_dev *indio_dev,
 				 struct iio_backend *back,
 				 struct iio_chan_spec *chan);
-- 
2.46.0