BEEP_BUFLEN
if (hz <= srate / BEEP_BUFLEN || hz > srate / 2)
ncycles = BEEP_BUFLEN * 256 / period;
dmabuf = dma_alloc_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,
dma_free_coherent(&chip->pdev->dev, BEEP_BUFLEN * 4,