sound/core/pcm_dmaengine.c

30 	const struct snd_pcm_substream *substream)
32 	return substream->runtime->private_data;
35 struct dma_chan *snd_dmaengine_pcm_get_chan(struct snd_pcm_substream *substream)
37 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
45  * @substream: PCM substream
49  * This function can be used to initialize a dma_slave_config from a substream
54 int snd_hwparams_to_dma_slave_config(const struct snd_pcm_substream *substream,
75 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
92  * @substream: PCM substream
99  * direction of the substream. If the substream is a playback stream the dst
107 	const struct snd_pcm_substream *substream,
111 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
137 	struct snd_pcm_substream *substream = arg;
138 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
140 	new_pos = prtd->pos + snd_pcm_lib_period_bytes(substream);
141 	if (new_pos >= snd_pcm_lib_buffer_bytes(substream))
145 	snd_pcm_period_elapsed(substream);
148 static int dmaengine_pcm_prepare_and_submit(struct snd_pcm_substream *substream)
150 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
156 	direction = snd_pcm_substream_to_dma_direction(substream);
158 	if (!substream->runtime->no_period_wakeup)
163 		substream->runtime->dma_addr,
164 		snd_pcm_lib_buffer_bytes(substream),
165 		snd_pcm_lib_period_bytes(substream), direction, flags);
171 	desc->callback_param = substream;
179  * @substream: PCM substream
187 int snd_dmaengine_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
189 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
190 	struct snd_pcm_runtime *runtime = substream->runtime;
195 		ret = dmaengine_pcm_prepare_and_submit(substream);
226  * @substream: PCM substream
233 snd_pcm_uframes_t snd_dmaengine_pcm_pointer_no_residue(struct snd_pcm_substream *substream)
235 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
236 	return bytes_to_frames(substream->runtime, prtd->pos);
242  * @substream: PCM substream
249 snd_pcm_uframes_t snd_dmaengine_pcm_pointer(struct snd_pcm_substream *substream)
251 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
252 	struct snd_pcm_runtime *runtime = substream->runtime;
260 		buf_size = snd_pcm_lib_buffer_bytes(substream);
295  * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
296  * @substream: PCM substream
300  * this function will use private_data field of the substream's runtime. So it
305 int snd_dmaengine_pcm_open(struct snd_pcm_substream *substream,
314 	ret = snd_pcm_hw_constraint_integer(substream->runtime,
325 	substream->runtime->private_data = prtd;
332  * snd_dmaengine_pcm_open_request_chan - Open a dmaengine based PCM substream and request channel
333  * @substream: PCM substream
339  * that this function will use private_data field of the substream's runtime. So
344 int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
347 	return snd_dmaengine_pcm_open(substream,
353  * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
354  * @substream: PCM substream
358 int snd_dmaengine_pcm_close(struct snd_pcm_substream *substream)
360 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
371  *					  substream and release channel
372  * @substream: PCM substream
374  * Releases the DMA channel associated with the PCM substream.
378 int snd_dmaengine_pcm_close_release_chan(struct snd_pcm_substream *substream)
380 	struct dmaengine_pcm_runtime_data *prtd = substream_to_prtd(substream);
392  * @substream: PCM substream
403 	struct snd_pcm_substream *substream,
425 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)