ctucan_txtb_status
enum ctucan_txtb_status txtb_status;
static enum ctucan_txtb_status ctucan_get_tx_status(struct ctucan_priv *priv, u8 buf)
enum ctucan_txtb_status status = (tx_status >> (buf * 4)) & 0x7;
enum ctucan_txtb_status buf_status;