RSXX_IOC_MAGIC     30 drivers/block/rsxx/rsxx.h #define RSXX_GETREG _IOWR(RSXX_IOC_MAGIC, 0x20, struct rsxx_reg_access)
RSXX_IOC_MAGIC     31 drivers/block/rsxx/rsxx.h #define RSXX_SETREG _IOWR(RSXX_IOC_MAGIC, 0x21, struct rsxx_reg_access)