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
snd_ctl_unregister_ioctl – de-register the device-specific control-ioctls Synopsis int snd_ctl_unregister_ioctl(snd_kctl_ioctl_func_t fcn); Arguments fcn ioctl callback function to unregister Copyright
snd_ctl_sync_vmaster – Sync the vmaster slaves and hook Synopsis void snd_ctl_sync_vmaster(struct snd_kcontrol *kcontrol, bool hook_only); Arguments kcontrol vmaster kctl element hook_only sync only the hook Description Forcibly call the put callback of each slave and call the hook function to synchronize with the current value of the given vmaster element. NOP when NULL is passed…