linux-kernel - [PATCH v9 3/8] iio: backend: add API for oversampling

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Message-ID: <20241220120134.42760-3-antoniu.miclaus@analog.com>
Date: Fri, 20 Dec 2024 14:01:29 +0200
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pwm@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>,
        David Lechner
	<dlechner@...libre.com>
Subject: [PATCH v9 3/8] iio: backend: add API for oversampling

Add backend support for setting oversampling ratio.

Reviewed-by: David Lechner <dlechner@...libre.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
changes in v9:
 - use quotes on "IIO_BACKEND"
 drivers/iio/industrialio-backend.c | 15 +++++++++++++++
 include/linux/iio/backend.h        |  5 +++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index 2088afa7a55c..d4ad36f54090 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -681,6 +681,21 @@ int iio_backend_data_size_set(struct iio_backend *back, unsigned int size)
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_data_size_set, "IIO_BACKEND");
 
+/**
+ * iio_backend_oversampling_ratio_set - set the oversampling ratio
+ * @back: Backend device
+ * @ratio: The oversampling ratio - value 1 corresponds to no oversampling.
+ *
+ * Return:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_oversampling_ratio_set(struct iio_backend *back,
+				       unsigned int ratio)
+{
+	return iio_backend_op_call(back, oversampling_ratio_set, ratio);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_oversampling_ratio_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 9ae861a21472..e45b7dfbec35 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -96,6 +96,7 @@ enum iio_backend_interface_type {
  * @ext_info_get: Extended info getter.
  * @interface_type_get: Interface type.
  * @data_size_set: Data size.
+ * @oversampling_ratio_set: Set Oversampling ratio.
  * @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.
@@ -139,6 +140,8 @@ struct iio_backend_ops {
 	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 (*oversampling_ratio_set)(struct iio_backend *back,
+				      unsigned int ratio);
 	int (*read_raw)(struct iio_backend *back,
 			struct iio_chan_spec const *chan, int *val, int *val2,
 			long mask);
@@ -200,6 +203,8 @@ 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);
 int iio_backend_data_size_set(struct iio_backend *back, unsigned int size);
+int iio_backend_oversampling_ratio_set(struct iio_backend *back,
+				       unsigned int ratio);
 int iio_backend_read_raw(struct iio_backend *back,
 			 struct iio_chan_spec const *chan, int *val, int *val2,
 			 long mask);
-- 
2.47.1