#!/bin/sh
# SPDX-License-Identifier: Apache-2.0
# Copyright (C) 2020-present Fewtarius

#
# A simple tool to manipulate the joystick LEDs using ectool, thanks to
# Maya (https://github.com/Maccraft123) for reverse engineering.
#
# Schema:
#
# 0x6d - LED PWM control (0x03)
#
# 0xb1 - Support for 4 zones and RGB color
#
#   RGB colors:
#
#   1 - Red
#   2 - Green
#   3 - Blue
#
#   Zones:
#
#   Right (2), Down (5), Left (8) , Up (11)
#
#   Note: Set 0xb1 to 02 for off.
#
# 0xb2 - Sets brightness, requires b1 to be set at the same time.
#
#   00-ff - brightness from 0-255.  Not noticeable to me above 128.
#
# 0xbf - Set expected mode
#
# 0x10 - Enable
# 0xe2 - Tint (+ Red for Purple, + Green for Teal)
# 0xe3-0e5 - Tint + blink (unused)
#
# 0xff - Close channel
#

. /etc/profile

ECTOOL="/usr/sbin/ectool"
DEBUG=false

function debug_out() {
  $DEBUG && echo "led_mgr: $*"
}

function ec_writecmd() {
  ${ECTOOL} -w 0x6d -z 0x03 >/dev/null 2>&1
}

function mode() {
  debug_out "Set mode ${1}"
  ${ECTOOL} -w 0xbf -z ${1} >/dev/null 2>&1
  ${ECTOOL} -w 0xbf -z ff >/dev/null 2>&1
}

function off() {
  ec_writecmd
  for twice in 1 2
  do
    ### RGB off command
    ${ECTOOL} -w 0xb1 -z 0x02 >/dev/null 2>&1
    mode 0x10
  done
}

function brightness() {
  debug_out "Set brightness ${1}"
  ${ECTOOL} -w 0xb2 -z 0x${1}  >/dev/null 2>&1
  mode 0x10
  set_setting led.brightness ${1}
}

function color() {
  ## Writing twice seems more reliable than inserting a delay.
  for twice in 1 2
  do
    for zone in 2 5 8 11
    do
      zone=$(( ${zone} + ${1} ))
      zone=$(printf '%02x' ${zone})
      debug_out "Set color 0x${zone}"
      ${ECTOOL} -w 0xb1 -z 0x${zone} >/dev/null 2>&1
      brightness ${2}
    done
  done
}

if [ "${2}" ]
then
  LEDBRIGHTNESS=${2}
else
  LEDBRIGHTNESS=$(get_setting led.brightness)
  if [ -z "${LEDBRIGHTNESS}" ]
  then
    LEDBRIGHTNESS=ff
  fi
fi
debug_out "led brightness: ${LEDBRIGHTNESS}"

case $1 in
  red)
    off
    color 1 ${LEDBRIGHTNESS}
    set_setting led.color red
  ;;
  green)
    off
    color 2 ${LEDBRIGHTNESS}
    set_setting led.color green
  ;;
  blue)
    off
    color 3 ${LEDBRIGHTNESS}
    set_setting led.color blue
  ;;
  teal)
    off
    mode 0xe2
    color 2 ${LEDBRIGHTNESS}
    set_setting led.color teal
  ;;
  purple)
    off
    mode 0xe2
    color 1 ${LEDBRIGHTNESS}
    set_setting led.color purple
  ;;
  off)
    off
    set_setting led.color off
  ;;
  default)
    del_setting led.color
    del_setting led.brightness
  ;;
  *)
    COLOR=$(get_setting led.color)
    LEDBRIGHTNESS=$(get_setting led.brightness)
    if [ ! -z "${COLOR}" ]
    then
      off
      led_mgr ${COLOR} ${LEDBRIGHTNESS}
    fi
  ;;
esac