Analog support

[meeuw]

Support Huntsman Mini Analog "driver mode" support where keys only emit their analog values.

Notes:

• There are not enough ABS_* codes for all of the keyboard buttons (so I reused the same codes for duplicate keys)
• Ripple LED effect doesn't work
• I'm not so sure about using the O(n) find_translation function, might be better to rewrite to switch/case?
• Sometimes keys don't emit a value lower than the threshold when "key up" and the key get's "stuck"
• Both key and absolute events are emitted
• Should "analog_threshold" be mapped to the mouse interface sysfs directory?

I understood that this might be out of scope for openrazer and the code is very specific to this keyboard. I hope you can help me find a way to collaborate on Razer Analog keyboards.

Partially fixes #1579

[z3ntu]

Sorry, forgot about this PR. I honestly really don't want to add such functionality to the openrazer driver. Maybe you can talk with the linux-input people upstream and try and find a good solution for this, that isn't Razer-specific (well, has a Razer-specific implementation of course but otherwise uses some sort of new standard that the input maintainers like)

[meeuw]

Hi @z3ntu I agree, in the meantime I've created a user-mode implementation (using hidraw) which fits my needs.

Linux input isn't ready for so many analog buttons, I don't like the hardcoded keyboard map and the implementation in this PR suffers from stuck keys.

I'm planning to put my focus on hid_razer (in the kernel) and see if I can add razer-analog support there.

[Quackdoc]

@meeuw do you have any updates on upstream work, and if not can you share the implementation? I have a tartarus pro which also uses analog keys and would like to do something similar to at least get it usable for what I need

[meeuw]

Hi @Quackdoc, sure I just published my project here:

https://github.com/meeuw/razer-analog

I'm not sure if the protocol similar to the huntsman analog keyboard, if not I'd recommend to do some usb monitoring (using wireshark) on the (windows) driver.

I've submitted a simple patch for hid_razer but it got ignored everytime I posted it so I gave up on it.

[Quackdoc]

ah thats a shame about the patch being ignored. I wonder if there is an irc channel the devs hang on that it could be brought up on, either way thanks for that. Analog keys help a lot with my RSI so that will be very helpful to me

Cheers!