get_device.sh

# follow https://unix.stackexchange.com/a/634849

# Usage
#       getdevicename 1234:abcd
#       getdevicenum 1234:abcd
# where
# 1234 is the IdVendor
# abcd is the IdProduct
# Those values could be captured using lsusb

getdevicename() {
    idV=${1%:*}
    idP=${1#*:}
    for path in `find /sys/ -name idVendor 2>/dev/null | rev | cut -d/ -f 2- | rev`; do
        if grep -q $idV $path/idVendor; then
            if grep -q $idP $path/idProduct; then
                find $path -name 'device' | grep block | rev | cut -d / -f 2 | rev
            fi
        fi
    done
}

getdevicenum() {
    idV=${1%:*}
    idP=${1#*:}
    for path in `find /sys/ -name idVendor 2>/dev/null | rev | cut -d/ -f 2- | rev`; do
        if grep -q $idV $path/idVendor; then
            if grep -q $idP $path/idProduct; then
                find $path -name 'device' | rev | cut -d / -f 8 | rev | grep "-" | head -n1
            fi
        fi
    done
}

Makefile

simple:
  source get_device.sh
  getdevicename 1234:abcd
  getdevicenum 1234:abcd

script:
  #Device VENDOR ID
  : ${DEVICE_VENDOR:="1234"}
  #Device PRODUCT ID
  : ${DEVICE_PRODUCT:="abcd"}
  source ./get_device.sh
  DEVICE_PATH=`getdevicename ${DEVICE_VENDOR}:${DEVICE_PRODUCT}`
  echo "Device Path is $DEVICE_PATH"
  cat /sys/bus/usb/devices/`getdevicenum ${DEVICE_VENDOR}:${DEVICE_PRODUCT}`/power/autosuspend

Example

I use the getdevicenum to automate disabling the auto-suspend, through the /etc/rc.local as instructed by this answer

#!/bin/bash

DEVICE_VENDOR=xxxx
DEVICE_PRODUCT=xxxx

getdevicenum() {
    idV=${1%:*}
    idP=${1#*:}
    for path in `find /sys/ -name idVendor 2>/dev/null | rev | cut -d/ -f 2- | rev`; do
        if grep -q $idV $path/idVendor; then
            if grep -q $idP $path/idProduct; then
                find $path -name 'device' | rev | cut -d / -f 8 | rev | grep "-" | head -n1
            fi
        fi
    done
}

echo setting /sys/bus/usb/devices/`getdevicenum ${DEVICE_VENDOR}:${DEVICE_PRODUCT}`/power/autosuspend to -1
echo -1 > /sys/bus/usb/devices/`getdevicenum ${DEVICE_VENDOR}:${DEVICE_PRODUCT}`/power/autosuspend