snd_dmaengine_pcm_open (9) - Linux Man Pages
snd_dmaengine_pcm_open: Open a dmaengine based PCM substream
snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
int snd_dmaengine_pcm_open(struct snd_pcm_substream
*substream, struct dma_chan *chan);
- PCM substream
- DMA channel to use for data transfers
Returns 0 on success, a negative error code otherwise.
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.