snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
int snd_dmaengine_pcm_open(struct snd_pcm_substream * substream, struct dma_chan * chan);
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.
|January 2017||Kernel Hackers Manual 4.8.|