snd_info_get_str – parse a string token Synopsis const char *snd_info_get_str(char *dest, const char *src, int len); Arguments dest the buffer to store the string token src the original string len the max. length of token – 1 Description Parses the original string and copy a token to the given string buffer. Return The updated pointer…
snd_info_get_line – read one line from the procfs buffer Synopsis int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len); Arguments buffer the procfs buffer line the buffer to store len the max. buffer size Description Reads one line from the buffer and stores the string. Return Zero if successful, or 1 if error or EOF. Copyright
snd_info_free_entry – release the info entry Synopsis void snd_info_free_entry(struct snd_info_entry *entry); Arguments entry the info entry Description Releases the info entry. Copyright
snd_info_create_module_entry – create an info entry for the given module Synopsis struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent); Arguments module the module pointer name the file name parent the parent directory Description Creates a new info entry and assigns it to the given module. Return The pointer of the new instance,…
snd_info_create_card_entry – create an info entry for the given card Synopsis struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, const char *name, struct snd_info_entry *parent); Arguments card the card instance name the file name parent the parent directory Description Creates a new info entry and assigns it to the given card. Return The pointer of the new instance,…
snd_hwparams_to_dma_slave_config – Convert hw_params to dma_slave_config Synopsis int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream, const struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); Arguments substream PCM substream params hw_params slave_config DMA slave config Description This function can be used to initialize a dma_slave_config from a substream and hw_params in a dmaengine based PCM driver implementation. Copyright
snd_hwdep_new – create a new hwdep instance Synopsis int snd_hwdep_new(struct snd_card *card, char *id, int device, struct snd_hwdep **rhwdep); Arguments card the card instance id the id string device the device index (zero-based) rhwdep the pointer to store the new hwdep instance Description Creates a new hwdep instance with the given index on the card….
snd_free_pages – release the pages Synopsis void snd_free_pages(void *ptr, size_t size); Arguments ptr the buffer pointer to release size the allocated buffer size Description Releases the buffer allocated via snd_malloc_pages. Copyright
snd_dmaengine_pcm_unregister – Removes a dmaengine based PCM device Synopsis void snd_dmaengine_pcm_unregister(struct device *dev); Arguments dev Parent device the PCM was register with Description Removes a dmaengine based PCM device previously registered with snd_dmaengine_pcm_register. Copyright
snd_dmaengine_pcm_trigger – dmaengine based PCM trigger implementation Synopsis int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd); Arguments substream PCM substream cmd Trigger command Description Returns 0 on success, a negative error code otherwise. This function can be used as the PCM trigger callback for dmaengine based PCM driver implementations. Copyright
snd_dmaengine_pcm_set_config_from_dai_data – Initializes a dma slave config using DAI DMA data. Synopsis void snd_dmaengine_pcm_set_config_from_dai_data(const struct snd_pcm_substream *substream, const struct snd_dmaengine_dai_dma_data *dma_data, struct dma_slave_config *slave_config); Arguments substream PCM substream dma_data DAI DMA data slave_config DMA slave configuration Description Initializes the {dst,src}_addr, {dst,src}_maxburst, {dst,src}_addr_width and slave_id fields of the DMA slave config from the same fields of…
snd_dmaengine_pcm_request_channel – Request channel for the dmaengine PCM Synopsis struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn, void *filter_data); Arguments filter_fn Filter function used to request the DMA channel filter_data Data passed to the DMA filter function Description Returns NULL or the requested DMA channel. This function request a DMA channel for usage with dmaengine PCM. Copyright
snd_dmaengine_pcm_register – Register a dmaengine based PCM device Synopsis int snd_dmaengine_pcm_register(struct device *dev, const struct snd_dmaengine_pcm_config *config, unsigned int flags); Arguments dev The parent device for the PCM device config Platform specific PCM configuration flags Platform specific quirks Copyright
snd_dmaengine_pcm_prepare_slave_config – Generic prepare_slave_config callback Synopsis int snd_dmaengine_pcm_prepare_slave_config(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct dma_slave_config *slave_config); Arguments substream PCM substream params hw_params slave_config DMA slave config to prepare Description This function can be used as a generic prepare_slave_config callback for platforms which make use of the snd_dmaengine_dai_dma_data struct for their DAI DMA data. Internally the…
snd_dmaengine_pcm_pointer_no_residue – dmaengine based PCM pointer implementation Synopsis snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream * substream); Arguments substream PCM substream Description This function is deprecated and should not be used by new drivers, as its results may be unreliable. Copyright
snd_dmaengine_pcm_pointer – dmaengine based PCM pointer implementation Synopsis snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream * substream); Arguments substream PCM substream Description This function can be used as the PCM pointer callback for dmaengine based PCM driver implementations. Copyright
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…
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…
snd_dmaengine_pcm_close_release_chan – Close a dmaengine based PCM substream and release channel Synopsis int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream); Arguments substream PCM substream Description Releases the DMA channel associated with the PCM substream. Copyright
snd_dmaengine_pcm_close – Close a dmaengine based PCM substream Synopsis int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream); Arguments substream PCM substream Copyright