On 2014-07-24 at 10:35:29 +0200, Nicolin Chen nicoleotsuka@gmail.com wrote:
The Asynchronous Sample Rate Converter (ASRC) converts the sampling rate of a signal associated with an input clock into a signal associated with a different output clock. The driver currently works as a Front End of DPCM with other Back Ends DAI links such as ESAI<->CS42888 and SSI<->WM8962 and SAI. It converts the original sample rate to a common rate supported by Back Ends for playback while converts the common rate of Back Ends to a desired rate for capture. It has 3 pairs to support three different substreams within totally 10 channels.
Signed-off-by: Nicolin Chen nicoleotsuka@gmail.com
[...]
--- /dev/null +++ b/sound/soc/fsl/fsl_asrc.c @@ -0,0 +1,1031 @@
[...]
+static struct platform_driver fsl_asrc_driver = {
- .probe = fsl_asrc_probe,
- .driver = {
.name = "fsl-asrc",.owner = THIS_MODULE,
Not necessary, this will be set by module_platform_driver (or the expansion of platform_driver_register, respectively).
.of_match_table = fsl_asrc_ids,.pm = &fsl_asrc_pm,- },
+}; +module_platform_driver(fsl_asrc_driver);
[...]
--- /dev/null +++ b/sound/soc/fsl/fsl_asrc_dma.c @@ -0,0 +1,384 @@
[...]
+static int fsl_asrc_dma_pcm_new(struct snd_soc_pcm_runtime *rtd) +{
- struct snd_card *card = rtd->card->snd_card;
- struct snd_pcm_substream *substream;
- struct snd_pcm *pcm = rtd->pcm;
- u64 dma_mask = DMA_BIT_MASK(32);
- int ret, i;
- if (!card->dev->dma_mask)
card->dev->dma_mask = &dma_mask;
dma_mask will go out of scope after fsl_asrc_dma_pcm_new returns, resulting in a stray pointer in card->dev->dma_mask.
- if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);- for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
substream = pcm->streams[i].substream;ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,FSL_ASRC_DMABUF_SIZE, &substream->dma_buffer);if (ret) {dev_err(card->dev, "failed to allocate DMA buffer\n");goto err;}- }
- return 0;
+err:
- if (--i == 0)
snd_dma_free_pages(&pcm->streams[i].substream->dma_buffer);- return ret;
+}
+static void fsl_asrc_dma_pcm_free(struct snd_pcm *pcm) +{
- struct snd_pcm_substream *substream;
- int i;
- for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_LAST; i++) {
substream = pcm->streams[i].substream;if (!substream)continue;snd_dma_free_pages(&substream->dma_buffer);substream->dma_buffer.area = NULL;substream->dma_buffer.addr = 0;- }
+}
+struct snd_soc_platform_driver fsl_asrc_platform = {
- .ops = &fsl_asrc_dma_pcm_ops,
- .pcm_new = fsl_asrc_dma_pcm_new,
- .pcm_free = fsl_asrc_dma_pcm_free,
+};
+EXPORT_SYMBOL_GPL(fsl_asrc_platform);
1.8.4