AresParts

Device feature app for the Redmi K40 Gaming (ares) on LineageOS 23.2: magnetic shoulder triggers (detection + per-game touch mapping), the RGB light strips, and vibration strength.

Clean rewrite following the LineageOS device-parts conventions (SettingsLib UI nested under Settings → System, package org.lineageos.settings.ares, platform-signed system_ext priv-app in the system_app SELinux domain).

Hardware facts (ares, lineage-23.2 kernel)

• /dev/gamekey: char 10,110; reads must be exactly 4 bytes: [hall_left, hall_right, key_left, key_right], each 0/1.
• Trigger evdev: xm_gamekey, KEY_F3/F4 = left slider open/close, KEY_F5/F6 = right slider open/close, KEY_F1/F2 = trigger presses.
• RGB LED: /sys/class/leds/{red,green,blue}/ with brightness, blink, trigger (no breath on this kernel); nodes are labeled sysfs_rgb_led via genfs_contexts (mt6893-common).
• Vibrator: aw8697; strength node is /sys/devices/platform/11d03000.i2c7/i2c-7/7-005a/vmax (raw register, not millivolts). Unlabeled as of M0 — needs sepolicy work before use.

Build

m AresParts — selected in device/xiaomi/ares/device.mk via the ARES_PARTS_APP switch during the migration off the legacy XiaomiParts.

Development referenced AYIKxD/Parts-ares.