sound/core/pcm_dmaengine.c

7  *	imx-pcm-dma-mx2.c, Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
8  *	mxs-pcm.c, Copyright (C) 2011 Freescale Semiconductor, Inc.
9  *	ep93xx-pcm.c, Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
16 #include <sound/pcm.h>
45  * @substream: PCM substream
50  * and hw_params in a dmaengine based PCM driver implementation.
92  * @substream: PCM substream
178  * snd_dmaengine_pcm_trigger - dmaengine based PCM trigger implementation
179  * @substream: PCM substream
182  * This function can be used as the PCM trigger callback for dmaengine based PCM
225  * snd_dmaengine_pcm_pointer_no_residue - dmaengine based PCM pointer implementation
226  * @substream: PCM substream
231  * Return: PCM position in frames
241  * snd_dmaengine_pcm_pointer - dmaengine based PCM pointer implementation
242  * @substream: PCM substream
244  * This function can be used as the PCM pointer callback for dmaengine based PCM
247  * Return: PCM position in frames
273  * snd_dmaengine_pcm_request_channel - Request channel for the dmaengine PCM
277  * This function request a DMA channel for usage with dmaengine PCM.
295  * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
296  * @substream: PCM substream
299  * The function should usually be called from the pcm open callback. Note that
301  * is not available to your pcm driver implementation.
332  * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel
333  * @substream: PCM substream
338  * data. The function should usually be called from the pcm open callback. Note
340  * it is not available to your pcm driver implementation.
384  * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
385  * @substream: PCM substream
397  * snd_dmaengine_pcm_close_release_chan - Close a dmaengine based PCM
399  * @substream: PCM substream
401  * Releases the DMA channel associated with the PCM substream.
414  * @substream: PCM substream
416  * @hw: PCM hw params
419  * This function will query DMA capability, then refine the pcm hardware
495 MODULE_DESCRIPTION("PCM dmaengine helper APIs");