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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. Reviewed-by: David Lechner Reviewed-by: Andy Shevchenko Signed-off-by: Janani Sunil --- 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"); + /** * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode * @back: Backend device diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index 3f95ed1fdf9e..9c16b695a602 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -133,6 +133,8 @@ enum iio_backend_capabilities { * @filter_type_set: Set filter type. * @interface_data_align: Perform the data alignment process. * @num_lanes_set: Set the number of lanes enabled. + * @crc_enable: Enable direction-specific CRC handling. + * @crc_disable: Disable direction-specific CRC handling. * @ddr_enable: Enable interface DDR (Double Data Rate) mode. * @ddr_disable: Disable interface DDR (Double Data Rate) mode. * @data_stream_enable: Enable data stream. @@ -189,6 +191,8 @@ struct iio_backend_ops { enum iio_backend_filter_type type); int (*interface_data_align)(struct iio_backend *back, u32 timeout_us); int (*num_lanes_set)(struct iio_backend *back, unsigned int num_lanes); + int (*crc_enable)(struct iio_backend *back); + int (*crc_disable)(struct iio_backend *back); int (*ddr_enable)(struct iio_backend *back); int (*ddr_disable)(struct iio_backend *back); int (*data_stream_enable)(struct iio_backend *back); @@ -237,6 +241,8 @@ int iio_backend_filter_type_set(struct iio_backend *back, enum iio_backend_filter_type type); int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout_us); int iio_backend_num_lanes_set(struct iio_backend *back, unsigned int num_lanes); +int iio_backend_crc_enable(struct iio_backend *back); +int iio_backend_crc_disable(struct iio_backend *back); int iio_backend_ddr_enable(struct iio_backend *back); int iio_backend_ddr_disable(struct iio_backend *back); int iio_backend_data_stream_enable(struct iio_backend *back); -- 2.43.0