bcm2835_dma_cb
struct bcm2835_dma_cb *control_block,
struct bcm2835_dma_cb *control_block;
sizeof(struct bcm2835_dma_cb), 32, 0);
struct bcm2835_dma_cb *control_block = d->cb_list[i].cb;
struct bcm2835_dma_cb *cb;