We are going to enable autosuspend and modify its autosuspend time for a USB device connected to your Linux box: 

1. Log in to your Linux box (Raspberry Pi, Ubuntu, and Docker containers won't work).
2. Switch to the root account:

$ sudo bash
#

3. Get the current autosuspend status for all USB devices that are connected:

# for f in /sys/bus/usb/devices/*/power/control; do echo "$f"; cat $f; done

4. Enable autosuspend for one of the devices:

# echo auto > /sys/bus/usb/devices/1-1.2/power/control

5. Read the autosuspend interval for the device:

# cat /sys/bus/usb/devices/1-1.2/power/autosuspend_delay_ms 

6. Modify the autosuspend interval:

# echo 5000 > /sys/bus/usb/devices/1-1.2/power/autosuspend_delay_ms 

7. Check the current power mode of the device:

# cat /sys/bus/usb/devices/1-1.2/power/runtime_status

The same operations can be programmed in C++ using the standard file API.