#!/bin/sh

# Disable wifi, and remove all modules.
# NOTE: Save our resolv.conf to avoid ending up with an empty one, in case the DHCP client wipes it on release (#6424).
cp -a "/etc/resolv.conf" "/tmp/resolv.ko"
old_hash="$(md5sum "/etc/resolv.conf" | cut -f1 -d' ')"

if [ -x "/sbin/dhcpcd" ]; then
    env -u LD_LIBRARY_PATH dhcpcd -d -k "${INTERFACE}"
    killall -q -TERM udhcpc default.script
else
    killall -q -TERM udhcpc default.script dhcpcd
fi

# NOTE: dhcpcd -k waits for the signalled process to die, but busybox's killall doesn't have a -w, --wait flag,
#       so we have to wait for udhcpc to die ourselves...
# NOTE: But if all is well, there *isn't* any udhcpc process or script left to begin with...
kill_timeout=0
while pkill -0 udhcpc; do
    # Stop waiting after 5s
    if [ ${kill_timeout} -ge 20 ]; then
        break
    fi
    usleep 250000
    kill_timeout=$((kill_timeout + 1))
done

new_hash="$(md5sum "/etc/resolv.conf" | cut -f1 -d' ')"
# Restore our network-specific resolv.conf if the DHCP client wiped it when releasing the lease...
if [ "${new_hash}" != "${old_hash}" ]; then
    mv -f "/tmp/resolv.ko" "/etc/resolv.conf"
else
    rm -f "/tmp/resolv.ko"
fi

wpa_cli -i "${INTERFACE}" terminate

[ "${WIFI_MODULE}" = "dhd" ] && wlarm_le -i "${INTERFACE}" down
ifconfig "${INTERFACE}" down

# Some sleep in between may avoid system getting hung
# (we test if a module is actually loaded to avoid unneeded sleeps)
if grep -q "^${WIFI_MODULE}" "/proc/modules"; then
    usleep 250000
    rmmod "${WIFI_MODULE}"
fi

# Handle dependencies, if any
WIFI_DEP_MOD=""
SKIP_SDIO_PWR_MODULE=""
case "${WIFI_MODULE}" in
    "moal")
        WIFI_DEP_MOD="mlan"
        SKIP_SDIO_PWR_MODULE="1"
        ;;
esac
if [ -n "${WIFI_DEP_MOD}" ]; then
    if grep -q "^${WIFI_DEP_MOD}" "/proc/modules"; then
        usleep 250000
        rmmod "${WIFI_DEP_MOD}"
    fi
fi

if [ -n "${SKIP_SDIO_PWR_MODULE}" ]; then
    usleep 250000
    ./luajit frontend/device/kobo/ntx_io.lua 208 0
else
    if grep -q "^sdio_wifi_pwr" "/proc/modules"; then
        # Handle the shitty DVFS switcheroo...
        if [ -n "${CPUFREQ_DVFS}" ]; then
            echo "0" >"/sys/devices/platform/mxc_dvfs_core.0/enable"
            if [ -n "${CPUFREQ_CONSERVATIVE}" ]; then
                echo "conservative" >"/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"
            else
                echo "userspace" >"/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor"
                cat "/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq" >"/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed"
            fi
        fi
        usleep 250000
        rmmod sdio_wifi_pwr
    fi

    # Poke the kernel via ioctl on platforms without the dedicated power module...
    if [ ! -e "/drivers/${PLATFORM}/wifi/sdio_wifi_pwr.ko" ]; then
        usleep 250000
        ./luajit frontend/device/kobo/ntx_io.lua 208 0
    fi
fi
