struct dev_ops  {
  int       devo_rev;                 /* Driver build version	*/
  int       devo_refcnt;              /* device reference count	*/
  int       (*devo_getinfo)(dev_info_t *dip, ddi_info_cmd_t infocmd, 
									 void *arg, void **result);
  int       (*devo_identify)(dev_info_t *dip);
  int       (*devo_probe)(dev_info_t *dip);
  int       (*devo_attach)(dev_info_t *dip, ddi_attach_cmd_t cmd);
  int       (*devo_detach)(dev_info_t *dip, ddi_detach_cmd_t cmd);
  int       (*devo_reset)(dev_info_t *dip, ddi_reset_cmd_t cmd);
  struct cb_ops      *devo_cb_ops;    /* cb_ops ptr for leaf driver*/
  struct bus_ops     *devo_bus_ops;   /* ptr for nexus drivers */
};