[PATCH v3] Input: keyboard - add device tree bindings for simple key matrixes

[Olof Johansson]

On Tue, Jan 3, 2012 at 8:44 AM, Dmitry Torokhov
<dmitry.torokhov at gmail.com> wrote:
> On Tue, Jan 03, 2012 at 04:29:30PM +0000, Russell King - ARM Linux wrote:
>> On Tue, Jan 03, 2012 at 08:22:21AM -0800, Simon Glass wrote:
>> > Can the Linux key codes fit in 8 bits?
>>
>> That depends on your point of view.
>>
>> If you hack on X, then the answer is yes and you ignore the squeels of
>> your users when certain key presses get misinterpreted.  (The Psion LX
>> platform, otherwise known as the Netbook Pro, suffered with this problem.)
>>
>> If you are a kernel hacker, the answer is no, because key codes currently
>> go all the way to 0x300.
>
> For bootloader environment 0-255 range is probably sufficient though,
> the upper keys are somewhat recent additions to the maps...

To keep things in common it would be convenient to not cap the key
code at 8 bits for everybody though, since we're looking at reaching
agreement on a common solution between firmware and linux. And no
matter what the size of the word is there will be need for a
translation table.


-Olof