On Mon, 2025-04-07 at 10:52 +0200, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
>
> Add backend support for getting the data source used.
>
> The ad3552r HDL implements an internal ramp generator, so adding the
> getter to allow data source get/set by debugfs.
>
> Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
> ---
Reviewed-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
> drivers/iio/industrialio-backend.c | 28 ++++++++++++++++++++++++++++
> include/linux/iio/backend.h | 5 +++++
> 2 files changed, 33 insertions(+)
>
> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-
> backend.c
> index
> a43c8d1bb3d0f4dda4277cac94b0ea9232c071e4..c1eb9ef9db08aec8437d0d00cf77914ad661
> 1b72 100644
> --- a/drivers/iio/industrialio-backend.c
> +++ b/drivers/iio/industrialio-backend.c
> @@ -380,6 +380,34 @@ int iio_backend_data_source_set(struct iio_backend *back,
> unsigned int chan,
> }
> EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_set, "IIO_BACKEND");
>
> +/**
> + * iio_backend_data_source_get - Get current data source
> + * @back: Backend device
> + * @chan: Channel number
> + * @data: Pointer to receive the current source value
> + *
> + * A given backend may have different sources to stream/sync data. This
> allows
> + * to know what source is in use.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_data_source_get(struct iio_backend *back, unsigned int chan,
> + enum iio_backend_data_source *data)
> +{
> + int ret;
> +
> + ret = iio_backend_op_call(back, data_source_get, chan, data);
> + if (ret)
> + return ret;
> +
> + if (*data >= IIO_BACKEND_DATA_SOURCE_MAX)
> + return -EINVAL;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_data_source_get, "IIO_BACKEND");
> +
> /**
> * iio_backend_set_sampling_freq - Set channel sampling rate
> * @back: Backend device
> diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
> index
> e45b7dfbec35c094942a3034fc6057a7960b9772..e59d909cb65924b4872cadd4b7e5e894c13c
> 189f 100644
> --- a/include/linux/iio/backend.h
> +++ b/include/linux/iio/backend.h
> @@ -84,6 +84,7 @@ enum iio_backend_interface_type {
> * @chan_disable: Disable one channel.
> * @data_format_set: Configure the data format for a specific channel.
> * @data_source_set: Configure the data source for a specific channel.
> + * @data_source_get: Data source getter for a specific channel.
> * @set_sample_rate: Configure the sampling rate for a specific channel.
> * @test_pattern_set: Configure a test pattern.
> * @chan_status: Get the channel status.
> @@ -115,6 +116,8 @@ struct iio_backend_ops {
> const struct iio_backend_data_fmt *data);
> int (*data_source_set)(struct iio_backend *back, unsigned int chan,
> enum iio_backend_data_source data);
> + int (*data_source_get)(struct iio_backend *back, unsigned int chan,
> + enum iio_backend_data_source *data);
> int (*set_sample_rate)(struct iio_backend *back, unsigned int chan,
> u64 sample_rate_hz);
> int (*test_pattern_set)(struct iio_backend *back,
> @@ -176,6 +179,8 @@ int iio_backend_data_format_set(struct iio_backend *back,
> unsigned int chan,
> const struct iio_backend_data_fmt *data);
> int iio_backend_data_source_set(struct iio_backend *back, unsigned int chan,
> enum iio_backend_data_source data);
> +int iio_backend_data_source_get(struct iio_backend *back, unsigned int chan,
> + enum iio_backend_data_source *data);
> int iio_backend_set_sampling_freq(struct iio_backend *back, unsigned int
> chan,
> u64 sample_rate_hz);
> int iio_backend_test_pattern_set(struct iio_backend *back,
