Re: [PATCH v4 03/14] iio: backend: Add support for CRC

Add a backend operation to enable or disable direction-specific CRC
handling. On input data paths, the backend handles CRC data generated by
the frontend. On output data paths, the backend generates CRC data for
the frontend to verify.

Signed-off-by: Janani Sunil <janani.sunil@analog.com>
---
 drivers/iio/industrialio-backend.c | 33 +++++++++++++++++++++++++++++++++
 include/linux/iio/backend.h        |  6 ++++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index f7a4be8ec320..fbf5c39d7655 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c

@@ -886,6 +886,39 @@ int iio_backend_num_lanes_set(struct iio_backend *back, unsigned int num_lanes)
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_num_lanes_set, "IIO_BACKEND");
 
+/**
+ * iio_backend_crc_enable - Enable CRC handling
+ * @back: Backend device
+ *
+ * On input data paths, enable backend handling of CRC data generated by the
+ * frontend. On output data paths, enable the backend to generate CRC data for
+ * the frontend to verify.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_crc_enable(struct iio_backend *back)
+{
+	return iio_backend_op_call(back, crc_enable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_crc_enable, "IIO_BACKEND");
+
+/**
+ * iio_backend_crc_disable - Disable CRC handling
+ * @back: Backend device
+ *
+ * On input data paths, disable backend handling of CRC data generated by the
+ * frontend. On output data paths, disable CRC generation by the backend.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_crc_disable(struct iio_backend *back)
+{
+	return iio_backend_op_call(back, crc_disable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_crc_disable, "IIO_BACKEND");
+