iio: backend: add API for oversampling

Add backend support for setting oversampling ratio.

Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250214131955.31973-4-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index 2088afa7a55ce473449e04de1758f67148bd40d7..d4ad36f54090204bf3bef08457d4aa55aa7c11fc 100644 (file)
--- 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 9ae861a21472882c88aecec765a690ff86edab63..e45b7dfbec35c094942a3034fc6057a7960b9772 100644 (file)
--- 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);