scripts/g14control.sh

#!/usr/bin/env bash

set -x

# g14control.sh
#
# version: 1.0
# date: 2021-08-01
# author: hmk 
# description: A hardware interface script for ASUS ROG Zephyrus G14 laptops.
#     Primary purpose is to give a minimal wrapper for hardware control in
#     minimal desktop environments or without any desktop environment a all.
#
#     Tested on:
#     - GA401IH-BM013T (2020)
#
#
# TODO:
# - POSIX compliancy (currently uses non-POSIX-complient bash extensions)
# - is amdgpu_bl0 the only dsiplay backlight interface? What happens when dGPU
#     is active?
#

disp() {
	# Changes display backlight to a given level or steps up/down

	INTERFACE="/sys/class/backlight/amdgpu_bl0/brightness"
	MAX=$(cat /sys/class/backlight/amdgpu_bl0/max_brightness)
	STEP=$((MAX/10))
	CURRLEVEL=$(cat ${INTERFACE})

	if [[ ${1} == "up" ]]; then
		[[ $((CURRLEVEL+STEP)) > ${MAX} ]] && \
			LEVEL=${MAX} || \
		[[ ${CURRLEVEL} < ${MAX} ]] && \
			LEVEL=$((CURRLEVEL+STEP))
	elif [[ ${1} == "down" ]]; then
		[[ $((CURRLEVEL-STEP)) < 0 ]] && \
			LEVEL=0 ||
		[[ ${CURRLEVEL} > 0 ]] && \
			LEVEL=$((CURRLEVEL-STEP))
	elif [[ ${1} =~ ^[0-9]{1,${#MAX}}$ && ! ${1} > ${MAX} ]]; then
		LEVEL=${1}
	fi

	echo ${LEVEL} > ${INTERFACE}

	CHKLEVEL=$(cat ${INTERFACE})

	notify-send -t 500 "Display backlight level changed" \
		"${CURRLEVEL} -> ${CHKLEVEL}"
}

kbd() {
	# Changes keyboard backlight to a given level or steps up/down.
	# param:[0-3]	set backlight level to NUM
	# param:up	step backlight up
	# param:down	step backlight down

	INTERFACE="/sys/class/leds/asus::kbd_backlight/brightness"
	MAX=$(cat /sys/class/leds/asus::kbd_backlight/max_brightness)
	CURRLEVEL=$(cat ${INTERFACE})

	[[ ${1} =~ ^[0-${MAX}]$ ]] && \
		LEVEL=${1}
	[[ ${1} == "up" && ${CURRLEVEL} < ${MAX} ]] && \
		LEVEL=$((CURRLEVEL+1))
	[[ ${1} == "down" && ${CURRLEVEL} > 0 ]] && \
		LEVEL=$((CURRLEVEL-1))

	echo ${LEVEL} > ${INTERFACE}

	CHKLEVEL=$(cat ${INTERFACE})

	notify-send -t 500 "Keyboard backlight level changed" \
		"${CURRLEVEL} -> ${CHKLEVEL}"
}

fan() {
	# Changes fan mode to a given mode or rotates through modes.
	# 0 = Normal/Balanced
	# 1 = Boost
	# 2 = Silent.
	# param:[0-2]	Set fan mode to given mode
	# param:NONE	Rotate through modes Balanced -> Boost -> Silent

	MODELIST=("Balanced" "Boost" "Silent")
	INTERFACE="/sys/devices/platform/asus-nb-wmi/throttle_thermal_policy"
	CURRMODE=$(cat ${INTERFACE})

	if [[ ${1} =~ ^[0-2]$ ]]; then
		MODE=${1}
	else
		if [[ ${CURRMODE} == 2 ]]; then 
		       	MODE=0
		else
		       	let MODE=$((CURRMODE+1))
		fi
	fi

	echo ${MODE} > ${INTERFACE}

	CHKMODE=$(cat ${INTERFACE})

	notify-send "Fan mode changed" \
		"${MODELIST[${CURRMODE}]} -> ${MODELIST[${CHKMODE}]}"
}

usage() {
	echo "Usage: $0 [-d LEVEL|up|down] [-k LEVEL|up|down] [-f MODE] [-F] [-h]"
}


while getopts "d:k:f:Fh" ARG; do
	case "${ARG}" in
		d)
			disp ${OPTARG}
			;;
		k)
			kbd ${OPTARG}
			;;
		F)
			fan ${OPTARG}
			;;
		f)
			fan ${OPTARG}
			;;
		h)
			usage
			exit 0
			;;
		*)
			usage
			exit 1
			;;
	esac
done

exit 0