-typedef struct udi_init_s udi_init_t;
-typedef struct udi_primary_init_s udi_primary_init_t;
-typedef struct udi_secondary_init_s udi_secondary_init_t;
-typedef struct udi_ops_init_s udi_ops_init_t;
-typedef struct udi_cb_init_s udi_cb_init_t;
-typedef struct udi_cb_select_s udi_cb_select_t;
-typedef struct udi_gcb_init_s udi_gcb_init_t;
-
-typedef struct udi_init_context_s udi_init_context_t;
-typedef struct udi_limits_s udi_limits_t;
-typedef struct udi_chan_context_s udi_chan_context_t;
-typedef struct udi_child_chan_context_s udi_child_chan_context_t;
-
-typedef void udi_op_t(void);
-typedef udi_op_t * const udi_ops_vector_t;
-