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Date: Thu, 16 Apr 2009 16:17:11 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-help] driver: IOCTL command behavior
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To: Marcel Soulot <msoulot@domain.hid>
Cc: Xenomai help <xenomai@xenomai.org>

Marcel Soulot wrote:
> Hi,
> sorry, i don't realise that my description is a bit fuzzy.
> 
> Here I define two IOCTL command:
> 
> #define RT_GPIO_RTIOC_GET_DIRECTION\
>     _IOR(RTIOC_TYPE_GPIO, 0x01, int)
> 
> #define RT_GPIO_RTIOC_SET_DIRECTION\
>     _IOR(RTIOC_TYPE_GPIO, 0x02, int)
> 
> the commands (both) works fine. For the command
> RT_GPIO_RTIOC_SET_DIRECTION,I try to switch _IOR() to _IOW() according
> the driver "xeno_16550A" (in the
> file /usr/xenomai/include/rtdm/rtserial.h)
> 
> #define RTSER_RTIOC_GET_CONFIG    \
>     _IOR(RTIOC_TYPE_SERIAL, 0x00, struct rtser_config)
> 
> #define RTSER_RTIOC_SET_CONFIG    \
>     _IOW(RTIOC_TYPE_SERIAL, 0x01, struct rtser_config)
> 
> But when I define :
> 
> #define RT_GPIO_RTIOC_SET_DIRECTION\
>     _IOW(RTIOC_TYPE_GPIO, 0x02, int)
> 
> or
> 
> #define RT_GPIO_RTIOC_SET_DIRECTION\
>     _IOWR(RTIOC_TYPE_GPIO, 0x02, int)
> 
> the call of "rt_dev_ioctl(my_fd,RT_GPIO_RTIOC_SET_DIRECTION,0xFF)" returns
> me the error  "-ENOTTY".
> Which means that the command RT_GPIO_RTIOC_SET_DIRECTION is not recognized
> and I drop in default error.
> 
> Hope my explanation is better,

No, please send us enough code for us to reproduce the issue.

Please do not drop the mailing list from the discussion.

-- 
                                                 Gilles.