xboxdrv configuration for the Stadia controller and auto-select script

stadia-bt.xboxdrv

# page: https://xboxdrv.gitlab.io/
# manual: https://xboxdrv.gitlab.io/xboxdrv.html
# gitlab: https://gitlab.com/xboxdrv/xboxdrv
# tutorial: https://steamcommunity.com/app/221410/discussions/0/558748653738497361/
# ref: https://lh4.googleusercontent.com/-IYeHo2Xb820/UwaPEr2W-7I/AAAAAAAAGpw/ysXgr-l2o_Q/w462-h383-no/xbox.jpg

# to list devices: ls /dev/input/event*
# to test devices: evtest /dev/input/event<number>
# to find event: sed -n '/Stadia/,/^$/p' /proc/bus/input/devices
# and grep it  : sed -n '/Stadia/,/^$/p' /proc/bus/input/devices | grep event

[xboxdrv]
mimic-xpad	= true
# evdev-debug	= true

[evdev-absmap] 
ABS_X		= x1
ABS_Y		= y1
ABS_RZ		= y2
ABS_Z		= x2
ABS_HAT0Y	= dpad_y
ABS_HAT0X	= dpad_x
ABS_GAS		= rt
ABS_BRAKE	= lt

[evdev-keymap]
BTN_SOUTH	= a
BTN_EAST	= b
BTN_WEST	= y
BTN_NORTH	= x
BTN_TR		= rb
BTN_TL		= lb
BTN_THUMBR	= tr
BTN_THUMBL	= tl
BTN_SELECT	= back
BTN_START	= start
BTN_MODE	= guide

[axismap]
-Y1		= Y1
-Y2		= Y2

stadia-controller.sh

# Commands explanation:
# List of all devices 			-> /proc/bus/input/devices
# Find device that contains Stadia 	-> sed
# Find the line that contains the event -> grep
# Extract the event number 		-> egrep

# EVENT=$(sed -n '/Stadia/,/^$/p' /proc/bus/input/devices | grep event | egrep -o "event\S")
EVENT=$(sed -n '/Stadia/,/^$/p' /proc/bus/input/devices | grep event | grep -o 'event[0-9]\+')

if [[ -z "$EVENT" ]]; then
  echo -e "\n Stadia controller not found!\n"
  exit 1
fi

echo -e "\n Stadia controller found in /dev/input/$EVENT \n\n"
xboxdrv --config stadia-bt.xboxdrv --evdev /dev/input/$EVENT