On Thu, 2024-09-19 at 11:20 +0200, Angelo Dureghello wrote:
> From: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
>
> Extend backend features with new calls needed later on this
> patchset from axi version of ad3552r.
>
> The follwoing calls are added:
>
> iio_backend_ext_sync_enable
> enable synchronize channels on external trigger
> iio_backend_ext_sync_disable
> disable synchronize channels on external trigger
> iio_backend_ddr_enable
> enable ddr bus transfer
> iio_backend_ddr_disable
> disable ddr bus transfer
> iio_backend_set_bus_mode
> select the type of bus, so that specific read / write
> operations are performed accordingly
> iio_backend_buffer_enable
> enable buffer
> iio_backend_buffer_disable
> disable buffer
> iio_backend_data_transfer_addr
> define the target register address where the DAC sample
> will be written.
>
> Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx>
> ---
> drivers/iio/industrialio-backend.c | 111 +++++++++++++++++++++++++++++++++++++
> include/linux/iio/backend.h | 23 ++++++++
> 2 files changed, 134 insertions(+)
>
> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-
> backend.c
> index 20b3b5212da7..f4802c422dbf 100644
> --- a/drivers/iio/industrialio-backend.c
> +++ b/drivers/iio/industrialio-backend.c
> @@ -718,6 +718,117 @@ static int __devm_iio_backend_get(struct device *dev, struct
> iio_backend *back)
> return 0;
> }
>
> +/**
> + * iio_backend_ext_sync_enable - Enable external synchronization
> + * @back: Backend device
> + *
> + * Enable synchronization by external signal.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ext_sync_enable(struct iio_backend *back)
> +{
> + return iio_backend_op_call(back, ext_sync_enable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ext_sync_enable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_ext_sync_disable - Disable external synchronization
> + * @back: Backend device
> + *
> + * Disable synchronization by external signal.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ext_sync_disable(struct iio_backend *back)
> +{
> + return iio_backend_op_call(back, ext_sync_disable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ext_sync_disable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
> + * @back: Backend device
> + *
> + * Enabling DDR, data is generated by the IP at each front
> + * (raising and falling) of the bus clock signal.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ddr_enable(struct iio_backend *back)
> +{
> + return iio_backend_op_call(back, ddr_enable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_enable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_ddr_disable - Disable interface DDR (Double Data Rate) mode
> + * @back: Backend device
> + *
> + * Disabling DDR data is generated byt the IP at rising or falling front
> + * of the interface clock signal (SDR, Single Data Rate).
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_ddr_disable(struct iio_backend *back)
> +{
> + return iio_backend_op_call(back, ddr_disable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_ddr_disable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_buffer_enable - Enable iio buffering
> + * @back: Backend device
> + *
> + * Enabling the buffer, buffer data is processed and sent out from the
> + * bus interface.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_buffer_enable(struct iio_backend *back)
> +{
> + return iio_backend_op_call(back, buffer_enable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_buffer_enable, IIO_BACKEND);
> +
> +/**
> + * iio_backend_buffer_disable - Disable iio buffering
> + * @back: Backend device
> + *
> + * Disabling the buffer, buffer data transfer on the bus interface
> + * is stopped.
> + *
> + * RETURNS:
> + * 0 on success, negative error number on failure.
> + */
> +int iio_backend_buffer_disable(struct iio_backend *back)
> +{
> + return iio_backend_op_call(back, buffer_disable);
> +}
> +EXPORT_SYMBOL_NS_GPL(iio_backend_buffer_disable, IIO_BACKEND);
> +
IIRC, both me and Jonathan had some comments about the above 2 calls? Aren't they
about buffering? I think I mentioned something about using the same buffer ops as
typical IIO devices use.
- Nuno Sá
