Re: Enable addition function keys

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Tue, May 24, 2011 at 07:39:22PM +0200, David Christen wrote:
> >>
> >> Dear Dmitry,
> >>
> >> I'm starting to feel stupid. I tried a simple code doing some ioctl
> >> calls using EVIOCSKEYCODE  and EVIOCGKEYCODE. But it does not appear
> >> to work. If I run it using ./ioctl-test /dev/input/event0 I get lots
> >> of complains about wrong arguments:
> >>
> >> ====
> >> evdev ioctl: Invalid argument
> >> [0]= 125, [1] = 0
> >> evdev ioctl: Invalid argument
> >> [0]= 126, [1] = 0
> >> evdev ioctl: Invalid argument
> >> [0]= 127, [1] = 0
> >> evdev ioctl: Invalid argument
> >> [0]= 128, [1] = 0
> >> evdev ioctl: Invalid argument
> >> [0]= 129, [1] = 0
> >> evdev ioctl: Invalid argument
> >> Testing changes
> >> evdev ioctl: Invalid argument
> >> [0]= 49, [1] = 49
> >> evdev ioctl: Invalid argument
> >> [0]= 50, [1] = 49
> >
> > The "scancode" for USB HID devices is full usage code (32 bit), so to
> > remap 'M' to 'N' I think you need to issue EVIOCSKEYCODE for
> > usage 0x00070010 (I think) and keycode 49 (KEY_N).
> >
> > BTW, this requires somewhat recent kernel. What kernel are you using?
> >
> Dear Dmitry,
> 
> So you mean it should say:
> 
> 	codes[0] = 0x00070010 ; /* M keycap */
> 	codes[1] = 49; /* assign to N */

Yes.

> 
> 	if(ioctl(fd, EVIOCSKEYCODE, codes)) {
> 		perror("evdev ioctl");
> 	}
> 
> 
> > P.S. In your program you call EVIOCSKEYCODE twice. I believe the 2nd
> > time, when you test, you want to call EVIOCGKEYCODE.
> >
> >
> 
> Yes, you were right. Please find the corrected file attached.
> 
> But it seems that the behavior is exactly the same.
> 
> The kernel I use is 2.6.33 . It's a debian distro running on a risc processor.

I am afraid you need 2.6.38. Or you'll have to backport the following
commits:

8613e4c Input: add support for large scancodes
ab4e019 Input: define separate EVIOCGKEYCODE_V2/EVIOCSKEYCODE_V2
de391d1 Input: fix typo in keycode validation supporting large scancodes
a0bf0ea Input: hid-input - switch to using new keycode interface
f5854fa Input: hid-input - allow mapping unknown usages

-- 
Dmitry
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