When a Device Delete request is received from the CMS, IDL calls the IDL Driver Instance (IDI) device delete callback that was registered during the init process. 

When the IDL calls the delete callback function (OnDevDelete), the IDI must perform a protocol specific delete and free all the protocol specific structures that it had allocated during device creation.

On completion, the IDI must call IdlDevDeleteResult with callback_index, pointer to IdlDev and the appropriate idlError (see Error Codes). 

Device Delete Callback Function

OnDevDelete 

IdlErrorCodes OnDevDelete(int callback_index, IdlDev *dev);

IdlDevDeleteCallbackSet

void IdlDevDeleteCallbackSet(Idl *idl, int (*OnDevDelete)(int, IdlDev *));

void IdlDevDeleteResult(int callbackIndex, IdlDev *dev, int idlError);