# QMK RGB Tool

Control the RGB lighting on QMK-compatible keyboards. Supports Impact 80 and Rainy 75 out of the box, and any other keyboard running QMK with the RGB Matrix subsystem and VIA support.

Cross-platform CLI for Linux, macOS, and Windows. Designed for automation, scripting, and agent consumption.

## Installation

On Linux, `libudev-dev` is required before building:

```bash
sudo apt install -y libudev-dev
```

Build locally:

```bash
git clone <repo-url>
cd qmk-rgb
go build -o qmk-rgb-tool ./cmd/qmk-rgb-tool/
```

And, to run it from anywhere, install globally (run from the repo root, installs to `$GOPATH/bin/`):

```bash
go install ./cmd/qmk-rgb-tool/
```

## Usage

```bash
# Discover connected keyboards
./qmk-rgb-tool keyboard info

# RGB commands target Logo, Backlight, and Side by default
./qmk-rgb-tool effect breathing
./qmk-rgb-tool effect rainbow_moving_chevron
./qmk-rgb-tool effect rainbow_moving_chevron --zone backlight
./qmk-rgb-tool brightness 160
./qmk-rgb-tool speed 2
./qmk-rgb-tool color 00ff00
# Raw mode IDs are zone-specific; ID 17 is Backlight-only
./qmk-rgb-tool mode 17 --zone backlight
./qmk-rgb-tool enable
./qmk-rgb-tool disable
./qmk-rgb-tool info

# Select exactly one zone
./qmk-rgb-tool brightness 160 --zone side

# Save and load RGB profiles
./qmk-rgb-tool save paul
./qmk-rgb-tool load paul
./qmk-rgb-tool list
./qmk-rgb-tool delete paul

# Select a keyboard by the number shown in `keyboard info`
./qmk-rgb-tool --device 1 enable
```

`--zone` is persistent across commands and accepts `logo`, `backlight`, or `side`.
Without `--zone`, commands target Logo, Backlight, and Side in that order.
With `--zone`, commands target exactly the selected zone. An unsupported
name for an explicit zone fails before the device is opened; a default
command skips unsupported zones and prints a warning on stderr.

All output is machine-parseable JSON when applicable.

## Selecting a Keyboard
`keyboard info` numbers every connected QMK keyboard starting at 1, and
`--device` takes that number:

```bash
./qmk-rgb-tool keyboard info
./qmk-rgb-tool --device 2 brightness 160
```

Without `--device`, commands run only when exactly one keyboard is connected.
With two or more, they fail and list the numbers you can choose from, so a
command never hits an unintended keyboard.

Numbers are assigned in a stable order (vendor ID, product ID, path), but they
are only guaranteed for the current session. Keyboards are identified by their
HID path, which the operating system reassigns on reboot, and most keyboards
report no serial number. Re-run `keyboard info` after reconnecting a keyboard
rather than storing the number.

## Brightness and Speed Are Not Applied Verbatim

The keyboard's firmware transforms these values per channel, so the accepted
range is 0–255 but the value the keyboard ends up holding is often different.
`brightness` reads every zone back and reports what it actually applied:

```console
$ qmk-rgb-tool brightness 200
Brightness logo 160 backlight 255 side 160 (requested 200)
$ qmk-rgb-tool brightness 160 --zone logo
Brightness set to 160
```

Observed on the Impact 80:

| Zone | Channel | Brightness | Speed |
|---|---|---|---|
| `logo` | `0x02` | clamps at 160 | any value above 0 becomes 4 |
| `backlight` | `0x03` | scales up, saturating at 255 | applied as given |
| `side` | `0x04` | clamps at 160 | any value above 0 becomes 4 |

The command exits 0 either way: a value the firmware cannot represent is not a
failure, but the summary line always states the value that was actually applied.
`speed` is not yet read back and still reports the requested value.

## Features

- **Cross-platform** — Linux, macOS, Windows via [hidapi](https://github.com/libusb/hidapi)
- **Zone-aware effects** — per-zone effect control (Logo, Backlight, Side) with zone-specific effect catalogs
- **Profile system** — save, load, list, and delete RGB presets as JSON files in `profiles/`
- **46 backlight effects** — complete Impact 80 effect family mapped to zone-aware effect names
- **Compatibility aliases** — `off`, `breathe`, `rainbow`, `solid`, `static` resolve to correct effect IDs per zone
- **Reactive & splash effects** — honor `color` and `speed` for key-press illumination
- **Machine-parseable output** — JSON for `keyboard info`, `info`, `list`, and `effect --list`
- **Agent-friendly** — designed for automation, scripting, and CLI-first workflows
- **Multiple devices** — `keyboard info` numbers each keyboard; `--device <n>` targets one

## Impact 80 Zones and Effects

| Zone | CLI name | VIA channel | Effect IDs |
|---|---|---:|---|
| Logo | `logo` | 2 | 0–6 |
| Backlight | `backlight` | 3 | 0–45 |
| Side | `side` | 4 | 0–6 |

Logo and Side share this complete effect family:

| ID | Name |
|---:|---|
| 0 | `none` |
| 1 | `wave` |
| 2 | `fixed_wave` |
| 3 | `spectrum` |
| 4 | `breathing` |
| 5 | `light` |
| 6 | `shutdown` |

Backlight uses the complete Impact 80 catalog:

| ID | Name | ID | Name |
|---:|---|---:|---|
| 0 | `none` | 23 | `flower_blooming` |
| 1 | `solid_color` | 24 | `raindrops` |
| 2 | `alphas_mods` | 25 | `jellybean_raindrops` |
| 3 | `gradient_up_down` | 26 | `hue_breathing` |
| 4 | `gradient_left_right` | 27 | `hue_pendulum` |
| 5 | `breathing` | 28 | `hue_wave` |
| 6 | `band_sat` | 29 | `pixel_flow` |
| 7 | `band_val` | 30 | `digital_rain` |
| 8 | `band_pinwheel_sat` | 31 | `solid_reactive` |
| 9 | `band_pinwheel_val` | 32 | `solid_reactive_wide` |
| 10 | `band_spiral_sat` | 33 | `solid_reactive_multiwide` |
| 11 | `band_spiral_val` | 34 | `solid_reactive_cross` |
| 12 | `cycle_all` | 35 | `solid_reactive_multicross` |
| 13 | `cycle_left_right` | 36 | `solid_reactive_nexus` |
| 14 | `cycle_up_down` | 37 | `solid_reactive_multinexus` |
| 15 | `cycle_out_in` | 38 | `splash` |
| 16 | `cycle_out_in_dual` | 39 | `multisplash` |
| 17 | `rainbow_moving_chevron` | 40 | `solid_splash` |
| 18 | `cycle_pinwheel` | 41 | `solid_multisplash` |
| 19 | `cycle_spiral` | 42 | `starlight` |
| 20 | `dual_beacon` | 43 | `starlight_dual_hue` |
| 21 | `rainbow_beacon` | 44 | `starlight_dual_sat` |
| 22 | `rainbow_pinwheels` | 45 | `riverflow` |

## Effect Behavior

Effects fall into categories that behave differently:

- **Static** effects (`solid_color`, `none`) display a steady output. The color is set by `color` and is constant.
- **Reactive** effects (`solid_reactive*`) light up on key press. They honor the color set by `color` — the pressed key's LEDs flash in the configured color. Use `speed` to adjust how long the illumination lasts.
- **Breathing** effects (`breathing`, `hue_breathing`) slowly fade in and out. They do not honor `color` directly; `hue_breathing` cycles through the full hue range.
- **Dynamic/stream** effects (`band_*`, `cycle_*`, `rainbow_*`, `starlight*`, `raindrops`, `jellybean_raindrops`, `flower_blooming`, `pixel_flow`, `riverflow`) animate independently. Most ignore `color` and use their own color palettes. `hue_breathing`, `hue_pendulum`, and `hue_wave` cycle through hues.
- **Splash** effects (`splash`, `multisplash`, `solid_splash`, `solid_multisplash`) react to key presses like reactive effects but with a splash pattern. `solid_splash` and `solid_multisplash` honor `color`.
- **Gradient** effects (`gradient_up_down`, `gradient_left_right`) create a color gradient across the keyboard. They do not honor `color`.
- **Alphas mods** (`alphas_mods`) colors modifier keys differently from alphanumeric keys. The colors are built-in and cannot be changed.

To set a permanent color, use `solid_color` and then `color <hex>`.

## Compatibility Aliases
Effect names are resolved independently for each target zone. Compatibility
aliases are `off` → `none`, `breathe` → `breathing`, `rainbow` → `spectrum`
for Logo/Side and `rainbow_moving_chevron` for Backlight, `rainbow_wave` →
`wave` for Logo/Side, and `solid` → `light` for Logo/Side and `solid_color`
for Backlight. The legacy `static` alias remains accepted as a compatibility
alias for `solid`.

The effect catalog is consistent with the QMK RGB Matrix firmware. The
keyboard implements the VIA protocol (version 3) and its 46 backlight effect
names match the QMK RGB Matrix effect catalog exactly — verified through live
testing. The animations are defined in
[QMK `rgb_matrix/animations/`](https://github.com/qmk/qmk_firmware/tree/master/quantum/rgb_matrix/animations),
where each effect has its own header file (e.g.
`digital_rain_anim.h`, `solid_reactive_anim.h`, `riverflow_anim.h`).

ID 39 is `multisplash`; ID 41 is the distinct `solid_multisplash` name.

`info` reports a `zones` array with each zone's channel, enabled state,
effect name and ID, brightness, speed, and color. The top-level `enabled`,
`mode`, `brightness`, and `speed` fields summarize the first selected zone.
If one zone cannot be queried, its record contains an `error`, other records
are retained, and the process exits non-zero after printing the JSON.

## Platform Setup

The tool uses [hidapi](https://github.com/libusb/hidapi) for cross-platform HID access.
Most platforms need no configuration, but Linux requires extra setup.

### Linux

To build, `libudev-dev` is required:

```bash
sudo apt install -y libudev-dev
```

To run without `sudo`, grant your user group access to hidraw devices. By default, hidraw devices are owned by root (`600`).
Choose one of the methods below.

#### Option 1: Quick (Per Session)

Grant your user group access to all HIDRAW devices:

```bash
sudo chown root:adm /dev/hidraw*
sudo chmod 660 /dev/hidraw*
```

This works for the current session only. Permissions reset after reboot.

#### Option 2: Permanent (udev Rule)

Create a persistent rule for the Impact 80:

```bash
echo 'SUBSYSTEM=="hidraw", ATTRS{idVendor}=="36b0", ATTRS{idProduct}=="309f", MODE="0660", GROUP="adm"' \
  | sudo tee /etc/udev/rules.d/99-qmk-rgb-tool.rules

sudo udevadm control --reload-rules
sudo udevadm trigger
sudo udevadm reload
```

This makes the Impact 80 accessible to members of the `adm` group on every boot.

### macOS

No setup required. macOS applications access HID devices directly through IOKit.

### Windows

No setup required. Windows applications access HID devices directly through the Windows HID API.

After Linux setup, run the tool as your regular user (no `sudo` needed).

## Known Keyboards

Any keyboard running QMK with the RGB Matrix subsystem and VIA support is
detected automatically via the QMK Raw HID signature (Usage Page 0xFF60,
Usage 0x61). No manual configuration required.

`keyboards.json` is optional. When present it only supplies friendly names:
`keyboard info` reports `"known": true` for models listed there and
`"known": false` for every other QMK keyboard. Both are fully controllable —
`known` describes the name lookup, not compatibility. Deleting or corrupting
the file costs you names only.

Two models are listed in `keyboards.json`:

| Keyboard        | VID    | PID    |
|-----------------|--------|--------|
| Wobkey Rainy 75 | 0x6666 | 0x0001 |
| Wobkey Impact 80| 0x36B0 | 0x309F |

## CLI Reference

| Command                         | Description                              |
|---------------------------------|------------------------------------------|
| `qmk-rgb-tool keyboard info`          | Discover connected QMK keyboards          |
| `qmk-rgb-tool enable`                 | Enable selected lighting zones            |
| `qmk-rgb-tool disable`                | Disable selected lighting zones           |
| `qmk-rgb-tool info`                   | Show per-zone RGB state (JSON)            |
| `qmk-rgb-tool effect <name>`          | Set a zone-aware effect by name           |
| `qmk-rgb-tool brightness <val>`       | Set brightness (0–255) on selected zones, verified by read-back |
| `qmk-rgb-tool speed <val>`            | Set effect speed (0–255) on selected zones |
| `qmk-rgb-tool color <hex>`            | Set color (e.g. `ff0000`) on selected zones |
| `qmk-rgb-tool mode <index>`           | Set a raw zone-specific effect ID         |
| `qmk-rgb-tool --zone <zone> ...`      | Target `logo`, `backlight`, or `side`     |
| `qmk-rgb-tool --device <n> ...`      | Target keyboard by number (see `keyboard info`) |
| `qmk-rgb-tool save [name]`            | Save current RGB state to `profiles/<name>.json` |
| `qmk-rgb-tool load [name]`            | Load and apply a profile from `profiles/` |
| `qmk-rgb-tool list`                   | List saved profiles                        |
| `qmk-rgb-tool delete [name]`          | Delete a saved profile                     |

## Profiles

Profiles store RGB state (effect, brightness, speed, color) per zone as JSON
files in the `profiles/` directory. They are the only way to persist RGB
settings across reboots. The keyboard's VIA protocol does not expose a
standard command to save RGB state to internal EEPROM, so profiles rely on
files instead.

## Architecture

```
cmd/qmk-rgb-tool/  # Cobra-based CLI
internal/device/  # HID discovery + keyboards.json loader
internal/hid/     # Cross-platform HID access (hidapi)
internal/rgb/     # Effects, colors, state
internal/via/     # VIA protocol implementation
```

## Protocol

Communicates via the QMK Raw HID interface (`Usage Page 0xFF60`, `Usage 0x61`) with 32-byte feature reports.

- `0x07` — Custom set value
- `0x08` — Custom get value
- Lighting channels: `0x02` logo, `0x03` backlight, `0x04` side lighting
- RGB values: brightness `0x01`, effect `0x02`, speed `0x03`, color `0x04`