Re: [PATCH] ioctl entries for joystick in compat_ioctl.h

[Pavel Machek <pavel@ucw.cz>]

Hi!

> I wanted to use a joystick on my sparc64 workstation, and discovered that the
> joystick driver uses simple ioclt that are safe to pass from 32bit user space
> to 64bit kernel space. My patch adds the necessary entries in compat_ioctl.h.
> 
> There is only one missing ioctl in the patch. The ioctl is defined like this:
> #define JSIOCGNAME(len)         _IOC(_IOC_READ, 'j', 0x13, len)
> so the command does not have a fixed value. I dont know how to handle this one,
> but it is only used to get the joystick name, all the applications I tried work
> well even if this ioctl fails.

Well, whoever invented that JSIOCGNAME should be shot. That is not
single ioctl, its 2^14 of them!

Testing for CONFIG_INPUT_JOYDEV_MODULE looks like bad idea. AFAIR
CONFIG_INPUT_JOYDEV_MODULE implies CONFIG_INPUT_JOYDEV. But this would
mean that you can not insert joydev module into kernel compiled with
JOYDEV=n. Perhaps it better to just simply kill the ifdef?

Vojtech, this fill be needed on x86-64, too. Can you take care of it?

									Pavel

> I have tested this patch with snes9x and jstest.c without any problems.
> 
> Regards,
> Raphael Assenat
> 
> --- linux-2.6.0-test4/fs/compat_ioctl.c Fri Aug 22 20:00:50 2003
> +++ linux-2.6.0-test4-raph/fs/compat_ioctl.c    Sun Sep  7 19:03:52 2003
> @@ -65,6 +65,7 @@
>  #include <linux/ctype.h>
>  #include <linux/ioctl32.h>
>  #include <linux/ncp_fs.h>
> +#include <linux/joystick.h>
> 
>  #include <net/sock.h>          /* siocdevprivate_ioctl */
>  #include <net/bluetooth/bluetooth.h>
> --- linux-2.6.0-test4/include/linux/compat_ioctl.h      Fri Aug 22 20:01:27
> 2003
> +++ linux-2.6.0-test4-raph/include/linux/compat_ioctl.h Sun Sep  7 20:07:57
> 2003
> @@ -680,3 +680,16 @@
>  COMPATIBLE_IOCTL(NBD_PRINT_DEBUG)
>  COMPATIBLE_IOCTL(NBD_SET_SIZE_BLOCKS)
>  COMPATIBLE_IOCTL(NBD_DISCONNECT)
> +
> +/* little j */
> +#if defined(CONFIG_INPUT_JOYDEV)||defined(CONFIG_INPUT_JOYDEV_MODULE)
> +COMPATIBLE_IOCTL(JSIOCGVERSION)
> +COMPATIBLE_IOCTL(JSIOCGAXES)
> +COMPATIBLE_IOCTL(JSIOCGBUTTONS)
> +COMPATIBLE_IOCTL(JSIOCSCORR)
> +COMPATIBLE_IOCTL(JSIOCGCORR)
> +COMPATIBLE_IOCTL(JSIOCSAXMAP)
> +COMPATIBLE_IOCTL(JSIOCGAXMAP)
> +COMPATIBLE_IOCTL(JSIOCSBTNMAP)
> +COMPATIBLE_IOCTL(JSIOCGBTNMAP)
> +#endif

-- 
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