data_xfer
INIT_WORK(&acdev->work, data_xfer);
dcdb->data_xfer = MYRB_DCDB_XFER_NONE;
dcdb->data_xfer = MYRB_DCDB_XFER_SYSTEM_TO_DEVICE;
dcdb->data_xfer = MYRB_DCDB_XFER_DEVICE_TO_SYSTEM;
dcdb->data_xfer = MYRB_DCDB_XFER_ILLEGAL;
} __packed data_xfer:2; /* Byte 1 Bits 0-1 */