How to hotswap the UltraBase

Introduction

Here is how I set up an X22 to allow hot ejection/removal of the ultrabase. See also this related page for the UltraBay. These instructions are well-tested, but ymmv.

Features

• Uses lt_hotswap to preserve DMA on re-insert
• Idiot-proof (relatively)

System

• X22 thinkpad + ultrabase + DVD-R
• lt_hotswap version 0.3.9
• kernel-2.6.17.1
• xorg 6.9.0

Files

rc.local

First, make sure the lt_hotswap module is loaded. Add this to /etc/rc.local (or use modprobe.preload, if you prefer)

echo "Loading lt_hotswap module"
modprobe lt_hotswap hdc_dock=1

/etc/acpi/events/lths

Disable the existing lths script. Here is the modified /etc/acpi/events/lths:

# Call the LTHS script
event=lths.*
#action=/usr/local/sbin/lths.sh %e
action=echo "Not invoking lths.sh; this is now done by the ultrabase_eject and insert scripts instead."

/etc/acpi/events/ultrabase_eject

Respond to an ultrabase eject event. Here is /etc/acpi/events/ultrabase_eject

#Ultrabase eject button has been pressed
#We can be triggered by an ibm/bay event if NOT using lt_hotswap, or an lt_hotswap event if we are.
event=ibm/bay.MSTR.00000003.00000000
event=lths.MSTR.00000003.00000000
action=/etc/acpi/actions/ultrabase_eject.sh

/etc/acpi/events/ultrabase_insert

Respond to an ultrabase insert event. Here is /etc/acpi/events/ultrabase_insert

#Ultrabase has been re-inserted
#We can be triggered by an ibm/bay event if NOT using lt_hotswap, or an lt_hotswap event if we are.
event=ibm/bay.MSTR.00000001.00000000
event=lths.MSTR.00000001.00000000
action=/etc/acpi/actions/ultrabase_insert.sh

/etc/acpi/actions/ultrabase_eject.sh

[rjn@mocha actions]$ cat ultrabase_eject.sh

1. !/bin/bash

echo "syncing disks for safety" sync

echo "Unregistering IDE interface for CDROM and preparing to eject."

1. Note: the BIOS will handle the ultrabay LED (number 3). It will
2. turn it on when the bay is loaded
3. turn it off when the bay is unloaded
4. blink it when it is waiting between an eject request and an eject. (Linux never takes long enough to see this!)

1. What if there is a disk in the drive?
2. Case 1: there is an umounted CDROM, or an AudioCD/DVD which is NOT playing.
3. OK to proceed.

1. Case 2: there is a mounted CDROM.

if grep hdc /proc/mounts >/dev/null; then

       echo "There is a mounted filesystem on /dev/hdc. Trying to unmount it"
       umount /dev/hdc
       if [ $? == 0 ]; then
               echo "Successfully unmounted the CDROM."
       else
               echo "The CDROM is busy; can't unmount. Do not try to undock."
               echo 9 > /proc/acpi/ibm/beep
               exit 1
       fi

fi

1. Case 3: there is a AudioCD/DVD which is currently playing.
2. How do we detect this? It could be just using cdplay (which has no process)
3. Assuming that we have already ruled out a mounted filesystem, then...

CDDBID=$(cddb-id /dev/hdc 2>/dev/null) if [ -n "$CDDBID" ]; then

       echo "There is a CD in the drive. Ejecting it"
       eject /dev/hdc
       #This has the bug that we don't really want to eject the disk; we merely want to stop it playing.
       #We're now OK to proceed.

fi

if /sbin/lsmod | grep lt_hotswap > /dev/null ; then

       echo "We are using lt_hotswap"

       #Eject the bay using lths.
       echo -n "MSTR eject" > /proc/acpi/lths

else

       echo "We are not using lt_hotswap. Do it the old way with idectl."

       #Unregister IDE interface 1. This WILL cause a kernel panic if there is anything in the drive!
       idectl 1 off

       #Tell the thinkpad the bay is to be ejected
       echo eject > /proc/acpi/ibm/bay

fi

1. Beep happily

echo 6 > /proc/acpi/ibm/beep

echo "OK to undock"

/etc/acpi/actions/ultrabase_insert.sh

ultrabase_eject.sh ultrabase_insert.sh [rjn@mocha actions]$ cat ultrabase_insert.sh

1. !/bin/bash

echo "Ultrabase has been inserted. Re-registering IDE interface for CDROM."

if /sbin/lsmod | grep lt_hotswap > /dev/null ; then

       echo "We are using lt_hotswap"
       echo "Enabling DMA on /dev/hdc"
       hdparm -d 1 -u 1 -c 1 /dev/hdc

       #LTHS already beeps; no beep required here.

else

       echo "We are not using lt_hotswap. Do it the old way with idectl."

       #Register IDE interface 1
       idectl 1 rescan

       #Turn DMA on again. But this is a vain attempt; it will fail unless we use lt_hotswap.
       sleep 2
       hdparm -d1 /dev/hdc || echo "WARNING: DMA cannot be re-enabled for hdc after insert. You'll have to reboot for now."

       #Beep happily
       echo 6 > /proc/acpi/ibm/beep

fi

echo "Redocked successfully"

echo "Note: KDE's volume manager may or may not work anymore." [rjn@mocha actions]$

Debugging

The easiest way to check what is happening is:

tail -f /var/log/acpid

Remember, after modifying anything in /etc/acpi/events, to reload the acpid rules:

killall -HUP acpid