snd_dmaengine_pcm_open_request_chan — Open a dmaengine based PCM substream and request channel
int snd_dmaengine_pcm_open_request_chan ( | struct snd_pcm_substream * substream, |
| dma_filter_fn filter_fn, | |
void * filter_data); |
substreamPCM substream
filter_fnFilter function used to request the DMA channel
filter_dataData passed to the DMA filter function
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.