Re: Setkeycodes w/ keycode >= 0x100 ?

[linux-os (Dick Johnson)]

On Fri, 3 Mar 2006, Ian E. Morgan wrote:

> On Fri, 3 Mar 2006, linux-os (Dick Johnson) wrote:
>
>>
>> On Fri, 3 Mar 2006, Ian E. Morgan wrote:
>>
>>> Since my HP notebook has some unrecognized keys, I have to use setkeycodes to
>>> make the kernel recognise them. However, many of the basic (<=255) KEY's from
>>> input.h are not suitable, but newer ones (>=0x100) woule be perfect.
>>>
>>> Any idea how to map scancodes to keycodes >=0x100 when setkeycodes won't
>>> accept hex input nor anything greater than 255?
>>>
>>> Regards,
>>> Ian Morgan
>>
>> The keyboard controller generates scan-codes from 0 to 255. It reads the
>> scan-code information from a byte-wide port (so-called PORT_A in the
>> PC/AT), so it can't be any larger than a byte. The controller provides a
>> code when the key is pressed and another code when the key is released.
>> The only difference between these codes is a single bit. This limits the
>> number of possible different scan codes to 127.
>>
>> The scan-codes are translated, based upon the Caps Lock, the Ctrl key, the
>> Alt key, and the Shift key so, in principle, you could have almost 4 times
>> as many keyboard symbols as scan-codes. However, you would have to rewrite
>> a lot of keyboard code to take advantage of this.
>
> Perhaps my question was unclear. Here is an example of what I do now:
>
> 	#KEY_COFFEE
> 	setkeycodes e00a 152
>
> This works, but is an illogical arbitrary assignment. I want to do this:
>
> 	#KEY_POWER2
> 	setkeycodes e00a 356
>
> (or some other such thing with a keycode >256). But it fails with:
>
> KDSETKEYCODE: Invalid argument
> failed to set scancode 8a to keycode 356
>
> In drivers/char/keyboard.c, there are three cases in which it can return
> -EINVAL, but I can't see obviously which one is being hit.
>
> Is the answer simply that we cannot bind scancodes to keycodes greater than
> 256? If so, then why are there newer KEY's defined in input.h >256, and how does
> one ever use them?
>
> Regards,
> Ian Morgan
>
> --
> -------------------------------------------------------------------
> Ian E. Morgan          Vice President & C.O.O.       Webcon, Inc.
> imorgan at webcon dot ca       PGP: #2DA40D07       www.webcon.ca
>    *  Customized Linux Network Solutions for your Business  *
> -------------------------------------------------------------------
>

Well the input.h in the distribution I use, has the highest key-code
as KEY_UNKNOWN and that is number 200. Perhaps you are trying to
use BTN_0 through BTN_N as key codes? Or perhaps there is some
unfinished business in your version of headers?

Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.47 BogoMips).
Warning : 98.36% of all statistics are fiction, book release in April.
_


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