MSMFB_IOCTL_MAGIC 20 include/linux/msm_mdp.h #define MSMFB_GRP_DISP _IOW(MSMFB_IOCTL_MAGIC, 1, unsigned int) MSMFB_IOCTL_MAGIC 21 include/linux/msm_mdp.h #define MSMFB_BLIT _IOW(MSMFB_IOCTL_MAGIC, 2, unsigned int)