Ejemplos de sw_dma_set_buffdone_fn en C++ (Cpp)

Ejemplo n.º 1

Archivo: sun4i-i2sdma.c Proyecto: panlinbing/lichee_linux-3.0

static int sun4i_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct sun4i_runtime_data *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	unsigned long totbytes = params_buffer_bytes(params);
	struct sun4i_dma_params *dma = 
					snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);

	int ret = 0;
	if (!dma)
		return 0;
		
	if (prtd->params == NULL) {
		prtd->params = dma;
		ret = sw_dma_request(prtd->params->channel,
					  prtd->params->client, NULL);
		if (ret < 0) {
				return ret;
		}
	}

	sw_dma_set_buffdone_fn(prtd->params->channel,
				    sun4i_audio_buffdone);
		
	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	runtime->dma_bytes = totbytes;

	spin_lock_irq(&prtd->lock);
	prtd->dma_loaded = 0;
	prtd->dma_limit = runtime->hw.periods_min;
	prtd->dma_period = params_period_bytes(params);
	prtd->dma_start = runtime->dma_addr;
	prtd->dma_pos = prtd->dma_start;
	prtd->dma_end = prtd->dma_start + totbytes;
	spin_unlock_irq(&prtd->lock);
	return 0;
}