snd_dmaengine_pcm_open (9) Linux Manual Page
snd_dmaengine_pcm_open – Open a dmaengine based PCM substream
Synopsis
int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream, struct dma_chan *chan);Arguments
substream
-
- PCM substream
chan
- DMA channel to use for data transfers
Description
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.