[PATCH v12 3/9] iio: backend: add API for oversampling

Antoniu Miclaus
2025-02-07T14:10:03Z

Add backend support for setting oversampling ratio.

Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
no changes in v12.
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);
--
2.48.1