RME9652_DMA_AREA_BYTES
capture_dma = snd_hammerfall_get_buffer(rme9652->pci, RME9652_DMA_AREA_BYTES);
playback_dma = snd_hammerfall_get_buffer(rme9652->pci, RME9652_DMA_AREA_BYTES);
#define RME9652_DMA_AREA_KILOBYTES (RME9652_DMA_AREA_BYTES/1024)
memset(rme9652->playback_buffer, 0, RME9652_DMA_AREA_BYTES);