Maybe http://vger.kernel.org/vger-lists.html#linux-input ?

On Mon, Aug 10, 2015 at 11:00 AM, Cl?ment Vuchener
[off-list ref] wrote:

It looks like no one had the answers to these questions. Is there a
better place to ask them?

quoted

Hello.

I first sent this email to kernel-mentors, but I got no response. So I
am sending it again here.

I wrote a driver for the Corsair K90 keyboard, it is my first kernel
development and I have a few questions about how to properly do a few
things (mainly interactions with the user space).

The Corsair Vengeance K90 is a mechanical keyboard with a backlight,
macro keys (G1 to G18) and some other special keys (macro recording,
profile switching, changing the light level or disabling the "windows
logo" keys). The macro playback can be switched between hardware or
software (from the driver not a key). Using the generic HID driver,
the macro keys and special keys send wrong key code or no key code at
all (because of the HID usage code used by the keyboard).

The source for my driver can be found at this address:
https://github.com/cvuchener/k90-linux-driver . It solves the problem
of the generic driver and add some handling of the other features (see
the README for more details).

So, my questions are about:

- Macro keys
For handling the macro keys from a software, they need to send some
keycodes but I have no idea what to use. Currently I use F keys above
12 and some MISC buttons and a parameter for changing that (at load
time). Are there 18 keycodes reserved for custom uses? It would also
be possible to send no keycode at all and use a specific software
listening to the hidraw or hiddev devices, but I think it would be
better to be able to use a generic software.

- Backlight
I chose to use a led class device to manage the backlight. It seems to
work fine but when unregistering the driver, the light is set to 0.
The keyboard remembers the previous light level and so nothing should
be done when registering or unregistering the driver. Is the led class
the right class for that? or am I using it wrong?

- Sending the macro profiles to the keyboard
I created a "profile" branch on my git repo for adding binary
attributes used for sending macro data to the keyboard. But I am not
sure it is a good idea, it may be better to leave that to the user space.

Any other comment is welcome.

Thanks,
Cl?ment

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