I've created a char device and I'm now trying to control the device usign io-devctl messages. I created a header file 
with some command definitions. It looks as follows:

#ifndef CTL_H_
#define CTL_H_

typedef struct _CTLArg
{
	bool 	b[16]; 	/* 16 general purpose boolean parameters	*/
	int 	i[16];  /* 16 general purpose integer parameters	*/
	float 	f[16];  /* 16 general purpose   float parameters	*/
} CTLArg, *PCTLArg;

#define COMMAND_BASE  1 	/*!< Command base for devctl messages 	*/

#define DEVCTL_TEST 	__DION(_DCMD_MISC,  COMMAND_BASE + 0)
#define DEVCTL_GET_EMULATION_MODE __DIOF(_DCMD_ALL,   COMMAND_BASE + 1, CTLArg)
#define DEVCTL_SET_EMULATION_MODE __DIOT(_DCMD_ALL,  COMMAND_BASE + 2, CTLArg)


#endif /*CTL_H_*/

 I also created a test project that looks like the attached test.cpp file. The problem is hat no matter what I try the 
devctl routine always returns ENOTTY. The device driver does call the hooked 'connect_funcs.open' and 'io_funcs.
close_dup' but the hooked 'io_funcs.devctl' function is never called. I looked at several examples and it looks like the
 protection an so is  correct. e.g. using: 
iofunc_attr_init ((iofunc_attr_t*)&dev_attr[idx], _S_IFCHR  | 0666, NULL, NULL); 

I also tried other device types as _S_ IFNAM    and _S_IFREG, all with the same negative result.  I'm getting pretty 
desperate since I have no clue why things are not working.

Hopefully someone knows what is going one here 

Best regards
Wim