TRANS_REQ_HD_SIZE
#define TRANS_WR_TX_SIZE(n) (TRANS_REQ_HD_SIZE + SPI_AVMM_VAL_SIZE * (n))
#define TRANS_RD_TX_SIZE TRANS_REQ_HD_SIZE
trans_len = TRANS_REQ_HD_SIZE;
data = (__le32 *)(br->trans_buf + TRANS_REQ_HD_SIZE);