The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
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
snd_dma_program – program an ISA DMA transfer Synopsis void snd_dma_program(unsigned long dma, unsigned long addr, unsigned int size, unsigned short mode); Arguments dma the dma number addr the physical address of the buffer size the DMA transfer size mode the DMA transfer mode, DMA_MODE_XXX Description Programs an ISA DMA transfer for the given buffer. Copyright
snd_dma_pointer – return the current pointer to DMA transfer buffer in bytes Synopsis unsigned int snd_dma_pointer(unsigned long dma, unsigned int size); Arguments dma the dma number size the dma transfer size Return The current pointer in DMA transfer buffer in bytes. Copyright
snd_dma_free_pages – release the allocated buffer Synopsis void snd_dma_free_pages(struct snd_dma_buffer *dmab); Arguments dmab the buffer allocation record to release Description Releases the allocated buffer via snd_dma_alloc_pages. Copyright
snd_dma_disable – stop the ISA DMA transfer Synopsis void snd_dma_disable(unsigned long dma); Arguments dma the dma number Description Stops the ISA DMA transfer. Copyright
snd_dma_alloc_pages_fallback – allocate the buffer area according to the given type with fallback Synopsis int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size, struct snd_dma_buffer *dmab); Arguments type the DMA buffer type device the device pointer size the buffer size to allocate dmab buffer allocation record to store the allocated data Description Calls the memory-allocator function…
snd_dma_alloc_pages – allocate the buffer area according to the given type Synopsis int snd_dma_alloc_pages(int type, struct device *device, size_t size, struct snd_dma_buffer *dmab); Arguments type the DMA buffer type device the device pointer size the buffer size to allocate dmab buffer allocation record to store the allocated data Description Calls the memory-allocator function for the…
snd_device_register – register the device Synopsis int snd_device_register(struct snd_card *card, void *device_data); Arguments card the card instance device_data the data pointer to register Description Registers the device which was already created via snd_device_new. Usually this is called from snd_card_register, but it can be called later if any new devices are created after invocation of snd_card_register….
snd_device_new – create an ALSA device component Synopsis int snd_device_new(struct snd_card *card, enum snd_device_type type, void *device_data, struct snd_device_ops *ops); Arguments card the card instance type the device type, SNDRV_DEV_XXX device_data the data pointer of this device ops the operator table Description Creates a new device component for the given data pointer. The device will…
snd_device_initialize – Initialize struct device for sound devices Synopsis void snd_device_initialize(struct device *dev, struct snd_card *card); Arguments dev device to initialize card card to assign, optional Copyright
snd_device_free – release the device from the card Synopsis void snd_device_free(struct snd_card *card, void *device_data); Arguments card the card instance device_data the data pointer to release Description Removes the device from the list on the card and invokes the callbacks, dev_disconnect and dev_free, corresponding to the state. Then release the device. Copyright
snd_device_disconnect – disconnect the device Synopsis void snd_device_disconnect(struct snd_card *card, void *device_data); Arguments card the card instance device_data the data pointer to disconnect Description Turns the device into the disconnection state, invoking dev_disconnect callback, if the device was already registered. Usually called from snd_card_disconnect. Return Zero if successful, or a negative error code on failure…
snd_ctl_unregister_ioctl_compat – de-register the device-specific compat 32bit control-ioctls Synopsis int snd_ctl_unregister_ioctl_compat(snd_kctl_ioctl_func_t fcn); Arguments fcn ioctl callback function to unregister Copyright