#! /bin/sh
# wlan_pwr -- version: "11-Apr-2020"
# Tested on Debian 8.11
# Improve CHIP's wireless performance by turning off power management.

set -e

# Log settings new
echo "wlan_pwr: IFACE $IFACE, MODE $MODE, ADDRFAM $ADDRFAM"

# Don't bother for loopback
if [ "$IFACE" = lo ]; then
	exit 0
fi

# Only run from ifup.
if [ "$MODE" != start ]; then
	exit 0
fi

# old off
# Only do it once (skip for inet6).
# if [ "$ADDRFAM" != inet ]; then
#	exit 0
# fi

# Hopefully wireless-tools is installed
if [ ! -x /sbin/iw ]; then
	exit 0
fi

# New
# The IFACE argument is not passed
# /sbin/iw dev $IFACE set power_save off
# Insert run through available wlans
echo "wlan_pwr: Setting power saving to off"
for wifi in `ip a | grep wlan | cut -f2 -d ' ' | sed "s/://"`
        do
        echo "wlan_pwr: Power save to off for $wifi"
        /sbin/iw dev $wifi set power_save off
        echo -n "wlan_pwr: $wifi is set to "
        /sbin/iw dev $wifi get power_save
        done

exit 0