linux-kernel - [PATCH v2 1/7] iio: backend: add API for interface get

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Message-ID: <20241004140922.233939-1-antoniu.miclaus@analog.com>
Date: Fri, 4 Oct 2024 17:07:50 +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>,
        Mike
 Looijmans <mike.looijmans@...ic.nl>,
        João Paulo Gonçalves <joao.goncalves@...adex.com>,
        Dumitru Ceclan <mitrutzceclan@...il.com>,
        AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>,
        Alisa-Dariana Roman
	<alisadariana@...il.com>,
        Sergiu Cuciurean <sergiu.cuciurean@...log.com>,
        Dragos Bogdan <dragos.bogdan@...log.com>,
        Antoniu Miclaus
	<antoniu.miclaus@...log.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-pwm@...r.kernel.org>
Subject: [PATCH v2 1/7] iio: backend: add API for interface get

Add backend support for obtaining the interface type used.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
changes in v2:
 - add IIO_BACKEND_INTERFACE_COUNT in enum.
 - add trailing commas where applies.
 drivers/iio/industrialio-backend.c | 24 ++++++++++++++++++++++++
 include/linux/iio/backend.h        | 11 +++++++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index efe05be284b6..a322b0be7b2c 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -449,6 +449,30 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_ext_info_set, IIO_BACKEND);
 
+/**
+ * iio_backend_interface_type_get - get the interace type used.
+ * @back: Backend device
+ * @type: Interface type
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_interface_type_get(struct iio_backend *back,
+				   enum iio_backend_interface_type *type)
+{
+	int ret;
+
+	ret = iio_backend_op_call(back, interface_type_get, type);
+	if (ret)
+		return ret;
+
+	if (*type >= IIO_BACKEND_INTERFACE_COUNT)
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_interface_type_get, 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 8099759d7242..34fc76c99d8a 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -63,6 +63,12 @@ enum iio_backend_sample_trigger {
 	IIO_BACKEND_SAMPLE_TRIGGER_MAX
 };
 
+enum iio_backend_interface_type {
+	IIO_BACKEND_INTERFACE_LVDS,
+	IIO_BACKEND_INTERFACE_CMOS,
+	IIO_BACKEND_INTERFACE_COUNT,
+};
+
 /**
  * struct iio_backend_ops - operations structure for an iio_backend
  * @enable: Enable backend.
@@ -81,6 +87,7 @@ enum iio_backend_sample_trigger {
  * @extend_chan_spec: Extend an IIO channel.
  * @ext_info_set: Extended info setter.
  * @ext_info_get: Extended info getter.
+ * @interface_type_get: Interface type.
  **/
 struct iio_backend_ops {
 	int (*enable)(struct iio_backend *back);
@@ -113,6 +120,8 @@ 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 (*interface_type_get)(struct iio_backend *back,
+				  enum iio_backend_interface_type *type);
 };
 
 int iio_backend_chan_enable(struct iio_backend *back, unsigned int chan);
@@ -142,6 +151,8 @@ ssize_t iio_backend_ext_info_set(struct iio_dev *indio_dev, uintptr_t private,
 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_extend_chan_spec(struct iio_dev *indio_dev,
 				 struct iio_backend *back,
 				 struct iio_chan_spec *chan);
-- 
2.46.2