iio_backend_data_size_set
ret = iio_backend_data_size_set(st->back, val);
ret = iio_backend_data_size_set(st->back, 24);
ret = iio_backend_data_size_set(st->back, 32);
ret = iio_backend_data_size_set(st->back, 20);
EXPORT_SYMBOL_NS_GPL(iio_backend_data_size_set, "IIO_BACKEND");
int iio_backend_data_size_set(struct iio_backend *back, unsigned int size);