snd_dmaengine_pcm_open_request_chan (9) Linux Manual Page
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.