Add installation script, default state file, and update README for Acer RGB control

.gitignore

@@ -1,2 +1,3 @@
 rgb
-acer-rgb-cli
+acer-rgb-cli
+acer-rgbd

Makefile

@@ -25,6 +25,12 @@ install: acer-rgbd acer-rgb
 	sudo install -Dm755 acer-rgb.sh  /usr/local/bin/acer-rgb
 	sudo install -Dm644 acer-rgbd.service /etc/systemd/system/acer-rgbd.service
 	sudo install -Dm644 acer-rgbd.socket /etc/systemd/system/acer-rgbd.socket
+	# install default state only if it doesn't already exist
+	@if [ ! -f /var/lib/acer-rgbd/state.txt ]; then \
+		sudo install -Dm644 state.default /var/lib/acer-rgbd/state.txt; \
+	else \
+		echo "/var/lib/acer-rgbd/state.txt already exists — leaving it in place"; \
+	fi
 
 	sudo systemctl daemon-reload
 	sudo systemctl enable --now acer-rgbd.service

README.md

@@ -0,0 +1,80 @@
+# acer-lighting
+
+Small tools to control Acer laptop RGB zones and a daemon that persists/apply states.
+
+## Build
+
+- Build the daemon only:
+
+```sh
+make acer-rgbd
+```
+
+- Build the CLI (used for manual commands and test targets):
+
+```sh
+make acer-rgb-cli
+```
+
+Or build everything with:
+
+```sh
+make build
+```
+
+## Install
+
+Install the daemon, helper script and systemd units:
+
+```sh
+sudo make install
+```
+
+The `install` target will:
+- Copy `acer-rgbd` to `/usr/local/bin/acer-rgbd` and `acer-rgb` to `/usr/local/bin/acer-rgb`.
+- Install systemd unit and socket under `/etc/systemd/system/` and enable/start the service.
+- Create `/var/lib/acer-rgbd/state.txt` with an initial "all green" state so the daemon applies green on first start.
+
+If you need to undo the install:
+
+```sh
+sudo make uninstall
+```
+
+## Usage
+
+- Send commands to the daemon using the `acer-rgb` helper (it talks to the daemon socket):
+
+```sh
+acer-rgb SET dev=keyboard hidraw=/dev/hidraw2 effect=static bright=100 r=0 g=255 b=0 zone=all
+acer-rgb GET
+```
+
+- You can also use the CLI binary for direct HID control (for testing):
+
+```sh
+sudo ./acer-rgb-cli /dev/hidraw2 keyboard static --brightness 100 --rgb 0 255 0 --zone all
+```
+
+## State file
+
+The daemon persists three lines (keyboard, lid, button) in `/var/lib/acer-rgbd/state.txt`. Editing that file (as root) changes the values the daemon will reapply on start.
+
+## Logs & troubleshooting
+
+View the daemon logs with:
+
+```sh
+journalctl -u acer-rgbd.service -f
+```
+
+If you modify the state file and want the daemon to reapply immediately, restart it:
+
+```sh
+sudo systemctl restart acer-rgbd.service
+```
+
+## Notes
+
+- The installer writes an initial all-green state (keyboard/lid/button) to `/var/lib/acer-rgbd/state.txt` so newly installed systems show green LEDs by default.
+- Running the daemon requires root privileges (or appropriate udev rules) to access the HID device.

acer-rgb

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SOCK="/run/acer-rgbd.sock"
+
+if [[ $# -lt 1 ]]; then
+  echo "Usage:"
+  echo "  acer-rgb GET"
+  echo "  acer-rgb SET hidraw=/dev/hidraw2 dev=keyboard effect=static bright=80 r=255 g=0 b=0 zone=all"
+  exit 2
+fi
+
+cmd="$*"
+if command -v socat >/dev/null 2>&1; then
+  printf "%s\n" "$cmd" | socat - UNIX-CONNECT:"$SOCK"
+else
+  printf "%s\n" "$cmd" | nc -U "$SOCK"
+fi

acer-rgbd.cpp

@@ -342,6 +342,10 @@ static bool load_and_apply_all(std::array<Settings,3>& states) {
     if (hid_write_feature(newState, hwerr)) {
       states[idx] = newState;
       any = true;
+    } else {
+      // couldn't apply to hardware now (device may not exist yet), keep desired state
+      std::println("[WARN] failed to apply to hw for dev {}: {}", device_to_str(newState.device), hwerr);
+      states[idx] = newState;
     }
   }
 

state.default

@@ -0,0 +1,3 @@
+SET dev=keyboard hidraw=/dev/hidraw2 effect=static bright=100 r=0 g=255 b=0 zone=all
+SET dev=lid hidraw=/dev/hidraw2 effect=static bright=100 r=0 g=255 b=0
+SET dev=button hidraw=/dev/hidraw2 effect=static bright=100 r=0 g=255 b=0