SND_DMAENGINE_PCM_OP(9)                      PCM API                      SND_DMAENGINE_PCM_OP(9)



NAME
       snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request
       channel

SYNOPSIS
       int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream * substream,
                                               dma_filter_fn filter_fn, void * filter_data);

ARGUMENTS
       substream
           PCM substream

       filter_fn
           Filter function used to request the DMA channel

       filter_data
           Data passed to the DMA filter function

DESCRIPTION
       Returns 0 on success, a negative error code otherwise.

       This function will request a DMA channel using the passed filter function and data. The
       function should usually be called from the pcm open callback. Note that this function will
       use private_data field of the substream's runtime. So it is not available to your pcm
       driver implementation.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   SND_DMAENGINE_PCM_OP(9)