SunOS 5.7 system:
int xxgetinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp)
Make sure that the minor number to instance number and the reverse translation is static, since getinfo(9E) may be called when the device is not attached. For example:
#define XXINST(dev) (getminor(dev) >> 3)
This is a required entry point; it cannot be replaced with nulldev(9F) or nodev(9F).