Re: [PATCH v2 9/9] ASoC: q6asm-dai: add support to copy callback

+static int q6asm_compr_copy(struct snd_soc_component *component,

• 	    struct snd_compr_stream *stream, char __user *buf,
  

• 	    size_t count)
  

  { struct snd_compr_runtime *runtime = stream->runtime; struct q6asm_dai_rtd *prtd = runtime->private_data; unsigned long flags;
• u32 wflags = 0;
• int avail, bytes_in_flight = 0;
• void *dstn;
• size_t copy;
• u32 app_pointer;
• u32 bytes_received;
• bytes_received = prtd->bytes_received;
• /**

/*

• * Make sure that next track data pointer is aligned at 32 bit boundary
  

• * This is a Mandatory requirement from DSP data buffers alignment
  

• */
  

• if (prtd->next_track)

• bytes_received = ALIGN(prtd->bytes_received, prtd->pcm_count);
  

• app_pointer = bytes_received/prtd->pcm_size;
• app_pointer = bytes_received - (app_pointer * prtd->pcm_size);
• dstn = prtd->dma_buffer.area + app_pointer;
• if (count < prtd->pcm_size - app_pointer) {

• if (copy_from_user(dstn, buf, count))
  

• 	return -EFAULT;
  

• } else {

• copy = prtd->pcm_size - app_pointer;
  

• if (copy_from_user(dstn, buf, copy))
  

• 	return -EFAULT;
  

• if (copy_from_user(prtd->dma_buffer.area, buf + copy,
  

• 		   count - copy))
  

• 	return -EFAULT;
  

• }