On Fri, 2025-05-09 at 13:50 +0300, Antoniu Miclaus wrote:
> Add backend support for staring the capture synchronization.
> When activated, it initates a proccess that aligns the sample's most
> significant bit (MSB) based solely on the captured data, without
> considering any other external signals.
>
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
> changes in v5:
> - add description for data_align function
> - add suffix for timeout parameter.
> drivers/iio/industrialio-backend.c | 23 +++++++++++++++++++++++
> include/linux/iio/backend.h | 3 +++
> 2 files changed, 26 insertions(+)
>
> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-
> backend.c
> index 038c9e1e2857..545923310f1f 100644
> --- a/drivers/iio/industrialio-backend.c
> +++ b/drivers/iio/industrialio-backend.c
> @@ -796,6 +796,29 @@ int iio_backend_filter_type_set(struct iio_backend *back,
> }
> EXPORT_SYMBOL_NS_GPL(iio_backend_filter_type_set, "IIO_BACKEND");
>
> +/**
> + * iio_backend_data_align - Perform the data alignment process.
> + * @back: Backend device
> + * @timeout_us: Timeout value in us.
> + *
> + * When activated, it initates a proccess that aligns the sample's most
> + * significant bit (MSB) based solely on the captured data, without
> + * considering any other external signals.
> + *
> + * The timeout_us value must be greater than 0.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout_us)
> +{
> + if (!timeout_us)
> + return -EINVAL;
> +
> + return iio_backend_op_call(back, interface_data_align, timeout_us);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_interface_data_align, "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 5526800f5d4a..a971a83121b7 100644
> --- a/include/linux/iio/backend.h
> +++ b/include/linux/iio/backend.h
> @@ -109,6 +109,7 @@ enum iio_backend_filter_type {
> * @debugfs_print_chan_status: Print channel status into a buffer.
> * @debugfs_reg_access: Read or write register value of backend.
> * @filter_type_set: Set filter type.
> + * @interface_data_align: Perform the data alignment process.
> * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
> * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
> * @data_stream_enable: Enable data stream.
> @@ -161,6 +162,7 @@ struct iio_backend_ops {
> unsigned int writeval, unsigned int *readval);
> int (*filter_type_set)(struct iio_backend *back,
> enum iio_backend_filter_type type);
> + int (*interface_data_align)(struct iio_backend *back, u32 timeout_us);
> int (*ddr_enable)(struct iio_backend *back);
> int (*ddr_disable)(struct iio_backend *back);
> int (*data_stream_enable)(struct iio_backend *back);
> @@ -203,6 +205,7 @@ int devm_iio_backend_request_buffer(struct device *dev,
> struct iio_dev *indio_dev);
> 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_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);