#!/bin/sh

case $1 in
  pre)    # unload the modules before going to sleep

    # Disable bluetooth if no device is connected
    if ps cax | grep bluetoothd && ! bluetoothctl info; then
      bluetoothctl power off
    fi

    ## Disable bluetooth regardless if devices are connected (see notes below)
    # if ps cax | grep bluetoothd; then
    #   bluetoothctl power off
    # fi

    ## IPTS: see notes below
    ## > Remove IPTS from ME side
    # modprobe -r ipts_surface
    # modprobe -r intel_ipts
    # modprobe -r mei_hdcp
    # modprobe -r mei_me
    # modprobe -r mei
    ## > Remove IPTS from i915 side
    # for i in $(find /sys/kernel/debug/dri -name i915_intel_ipts_cleanup); do
    #   echo 1 > $i
    # done
    ;;
  post)   # re-load modules after resume
    ## IPTS: see notes below
    ## > Load IPTS from i915 side
    # for i in $(find /sys/kernel/debug/dri -name i915_intel_ipts_init); do
    #   echo 1 > $i
    # done
    ## > Load IPTS from ME side
    # modprobe mei
    # modprobe mei_me
    # modprobe mei_hdcp
    # modprobe intel_ipts
    # modprobe ipts_surface

    # Restart bluetooth
    if ps cax | grep bluetoothd; then
      bluetoothctl power on
    fi
    ;;
esac

# Notes:
#
# - For IPTS, see
#   >  https://github.com/jakeday/linux-surface/issues/544#issuecomment-519126757
#   for an explanation/discussion. We do not unload/reload modules for now as
#   the IPTS drivers should be able to resume/suspend without this. If you
#   experience any issues on suspend/resume, please file an appropriate issue or
#   join the discussion linked above so that we can fix it. As a temporary
#   workaround, you may want to uncomment the IPTS-related lines above.
#
# - For bluetooth: If you have spontaneous wakeups, you may want to disable
#   bluetooth completely, regardless if any devices are connected or not, by
#   removing the `! bluetoothctl info;` part as indicated in the comment (e.g.
#   comment-out the original check and comment-in the one below). Note that you
#   may be required to re-connect your devices after resume if you choose this
#   change.