[alsa-devel] [PATCH v4 10/12] IIO: consumer: allow to set buffer sizes

[Jonathan Cameron]

On Thu, 9 Nov 2017 11:12:32 +0100
Arnaud Pouliquen <arnaud.pouliquen at st.com> wrote:

> Add iio consumer API to set buffer size and watermark according
> to sysfs API.
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen at st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron at huawei.com>
> ---
> V3 -> V4 changes:
>  - Set only the Watermark not the buffer lenght
>  - Rename functions to replace "params" with "watermark"
> 
>  drivers/iio/buffer/industrialio-buffer-cb.c | 11 +++++++++++
>  include/linux/iio/consumer.h                | 11 +++++++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/iio/buffer/industrialio-buffer-cb.c b/drivers/iio/buffer/industrialio-buffer-cb.c
> index 4847534..ea63c83 100644
> --- a/drivers/iio/buffer/industrialio-buffer-cb.c
> +++ b/drivers/iio/buffer/industrialio-buffer-cb.c
> @@ -104,6 +104,17 @@ struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
>  }
>  EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
>  
> +int iio_channel_cb_set_buffer_watermark(struct iio_cb_buffer *cb_buff,
> +					size_t watermark)
> +{
> +	if (!watermark)
> +		return -EINVAL;
> +	cb_buff->buffer.watermark = watermark;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(iio_channel_cb_set_buffer_watermark);
> +
>  int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
>  {
>  	return iio_update_buffers(cb_buff->indio_dev, &cb_buff->buffer,
> diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
> index 5e347a9..0d94557 100644
> --- a/include/linux/iio/consumer.h
> +++ b/include/linux/iio/consumer.h
> @@ -134,6 +134,17 @@ struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
>  						       void *private),
>  					     void *private);
>  /**
> + * iio_channel_cb_set_buffer_watermark() - set the buffer watermark.
> + * @cb_buffer:		The callback buffer from whom we want the channel
> + *			information.
> + * @watermark: buffer watermark in bytes.
> + *
> + * This function allows to configure the buffer watermark.
> + */
> +int iio_channel_cb_set_buffer_watermark(struct iio_cb_buffer *cb_buffer,
> +					size_t watermark);
> +
> +/**
>   * iio_channel_release_all_cb() - release and unregister the callback.
>   * @cb_buffer:		The callback buffer that was allocated.
>   */