Script that sets the openrazer driver device mode of connected Razer devices to 'driver'.

razer-driver-mode.sh

#!/bin/sh
:<<'EOF'
Copyright © 2018 Torge Matthies <openglfreak@googlemail.com>
This work is free. You can redistribute it and/or modify it under the
terms of the Do What The Fuck You Want To Public License, Version 2,
as published by Sam Hocevar. See http://www.wtfpl.net/ for more details.
EOF

LOG_DEBUG="${LOG_DEBUG:-0}"
LOG_INFO="${LOG_INFO:-1}"
LOG_WARN="${LOG_INFO:-1}"
LOG_ERROR="${LOG_INFO:-1}"
debug() {
	[ -n "$LOG_DEBUG" ] && [ 0 \!= "$LOG_DEBUG" ] && printf '[DEBUG] ' && printf '%s\n' "$*"
}
info() {
	[ -n "$LOG_INFO" ] && [ 0 \!= "$LOG_INFO" ] && printf '[INFO] ' && printf '%s\n' "$*"
}
warn() {
	[ -n "$LOG_WARN" ] && [ 0 \!= "$LOG_WARN" ] && printf '[WARNING] ' && printf '%s\n' "$*"
}
error() {
	[ -n "$LOG_ERROR" ] && [ 0 \!= "$LOG_ERROR" ] && printf '[ERROR] ' && printf '%s\n' "$*"
}

# Sets the device mode of a Razer device
#
# params:
#	string device_serial
#		The serial number of the device.
#	string device_mode
#		The new device mode. One of ('normal', 'driver').
#
# stdout:
#	Output of dbus-send.
#
# stderr:
#	Errors from dbus-send.
#
# exit code:
#	1 if not enough parameters were passed,
#	2 if too many parameters were passed,
#	16 if an invalid device_mode was passed,
#	the exit code of dbus-send otherwise.
set_device_mode() {
	if [ $# -ne 2 ]; then
		if [ $# -lt 2 ]; then
			# Not enough parameters
			return 1
		else
			# Too many parameters
			return 2
		fi
	fi
	
	# Translate device_mode parameter into mode id
	case "$2" in
		normal)
			# Mode 'normal' is mode id 0
			set -- "$1" byte:0;;
		driver)
			# Mode 'driver' is mode id 3
			set -- "$1" byte:3;;
		*)
			# Invalid mode
			return 16;;
	esac
	
	dbus-send --session --dest=org.razer --type=method_call /org/razer/device/"$1" razer.device.misc.setDeviceMode "$2" byte:0
}

# Lists the connected Razer devices
#
# stdout:
#	Newline-separated list of device serial numbers.
#
# stderr:
#	Errors from dbus-send.
#
# exit code:
#	2 if parameters were passed,
#	the exit code of dbus-send otherwise.
_list_devices() {
	if [ $# -ne 0 ]; then
		# Too many parameters
		return 2
	fi
	
	# qdbus --session org.razer /org/razer razer.devices.getDevices
	dbus-send --session --dest=org.razer --type=method_call --print-reply /org/razer razer.devices.getDevices |\
		# Cut off array header and footer
		tail -n +3 | head -n -1 |\
		# Cut off '      string "' part of line
		cut -c15- |\
		# Cut off closing quotes
		rev | cut -c2- | rev
}

# The main method of the program
main() {
	__main_device_list_file="$(mktemp)"
	__main_device_list_file_new="$(mktemp)"
	
	# Start listening for device_added signals
	debug 'Starting dbus-monitor'
	exec sh -c 'printf "%s\\n" "$$"; LINES= COLUMNS= LC_ALL=C exec dbus-monitor --session --profile "type=signal,path=/org/razer,interface=razer.devices"' 2>/dev/null |\
		{
			# Read dbus-monitor pid
			IFS= read -r __dbus_wait_for_signal_mpid
			debug "dbus-monitor pid: $__dbus_wait_for_signal_mpid"
			
			# Set the device mode for all currently connected Razer devices
			info 'Setting device mode for all connected devices'
			_list_devices | sort -u | tee "$__main_device_list_file" |\
				while IFS= read -r serial; do
					debug "Setting device mode of device $serial"
					set_device_mode "$serial" driver
				done
			
			# Skip table header
			IFS= read -r _
			IFS= read -r _
			
			# Set the device mode when a new Razer device is connected
			info 'Waiting for new devices'
			while IFS= read -r line; do
				case "$line" in
					*[[:space:]]/org/razer[[:space:]]razer.devices[[:space:]]device_added)
						# A device was added
						info 'New device detected, setting device mode'
						# Write all devices to __main_device_list_file_new
						_list_devices | sort -u > "$__main_device_list_file_new"
						# Process new devices
						comm -13 "$__main_device_list_file" "$__main_device_list_file_new" |\
							while IFS= read -r serial; do
								debug "Setting device mode of device $serial"
								set_device_mode "$serial" driver
							done
						
						# Exchange __main_device_list_file and __main_device_list_file_new
						__main_tmp="$__main_device_list_file"
						__main_device_list_file="$__main_device_list_file_new"
						__main_device_list_file_new="$__main_tmp"
						unset __main_tmp
						;;
					*[[:space:]]/org/razer[[:space:]]razer.devices[[:space:]]device_removed)
						# A device was removed
						info 'Device removed'
						if [ -n "$LOG_DEBUG" ] && [ "$LOG_DEBUG" \!= 0 ]; then
							# Write all devices to __main_device_list_file_new
							_list_devices | sort -u > "$__main_device_list_file_new"
							# Process removed devices
							comm -23 "$__main_device_list_file" "$__main_device_list_file_new" |\
								while IFS= read -r serial; do
									debug "Serial number of removed device: $serial"
								done
							
							# Exchange __main_device_list_file and __main_device_list_file_new
							__main_tmp="$__main_device_list_file"
							__main_device_list_file="$__main_device_list_file_new"
							__main_device_list_file_new="$__main_tmp"
							unset __main_tmp
						else
							# Write all devices to __main_device_list_file
							_list_devices | sort -u | tee "$__main_device_list_file"
						fi
						;;
				esac
			done
			
			# Kill dbus-monitor
			kill "$__dbus_wait_for_signal_mpid"
		}
}

main ${1+"$@"}