Add EVGA CLC liquid cooler controller (Asetek 690LC)

[UltronOfSpace]

Summary

• Adds USB controller for EVGA CLC 120/240/280/360 liquid coolers (Asetek 690LC platform, VID 0x2433, PID 0xB200)
• Supports Direct, Fading, Blinking, and Rainbow (EVGA-specific) modes
• Includes per-device color calibration stored in OpenRGB.json (R_Scale, G_Scale, B_Scale values 0-100)
• Protocol implementation based on liquidctl's Asetek 690LC documentation

Files added

Controllers/EVGACLCController/
  EVGACLCController.h              — USB protocol driver
  EVGACLCController.cpp            — Asetek 690LC command implementation
  EVGACLCControllerDetect.cpp      — Device detection (libusb)
  RGBController_EVGACLC.h          — OpenRGB RGBController wrapper
  RGBController_EVGACLC.cpp        — Mode/zone/LED definitions + calibration

Device details

• USB: VID 0x2433 (Asetek), PID 0xB200
• Protocol: USBXpress bulk transfers (same init sequence as CorsairHydroController)
• Commands: 0x10 (runtime config), 0x14 (firmware/status), 0x23 (rainbow speed)
• Endpoints: Write 0x02, Read 0x82

Color calibration

The EVGA CLC pump LED has a warm phosphor bias. Default calibration (R:20%, G:20%, B:100%) compensates so white matches typical GPU LEDs. Users can adjust in OpenRGB.json:

"EVGA CLC": {
    "Calibration": {
        "R_Scale": 20,
        "G_Scale": 20,
        "B_Scale": 100
    }
}

Test plan

• Tested on EVGA CLC 280 with Windows 11
• Verified fixed color, fading, blinking, and rainbow modes
• Confirmed device detection alongside ASUS TUF RTX 3070 Ti GPU
• Calibration settings persist across restarts
• Linux testing (should work — uses standard libusb)
• macOS testing

Windows note

Requires WinUSB driver installed via Zadig to replace the default Asetek CCVI driver. The device appears as "690LC" in Zadig.

References

• liquidctl Asetek 690LC guide
• OpenRGB GitLab issue #2696 — EVGA CLC 280 device request
• OpenRGB GitLab issue #1716 — EVGA CLC 240 device request