Difference between revisions of "SMAPI support for Linux"
(→Model-specific status: - note about cd_speed) |
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====Battery status features==== | ====Battery status features==== | ||
| − | To view exteded battery status | + | To view exteded battery status such as charging state, voltage, current, capacity, cycle count and model information: |
<pre> | <pre> | ||
| Line 83: | Line 83: | ||
</pre> | </pre> | ||
| − | The raw status data, including some fields not in the above (in case | + | The raw status data is also available, including some fields not in the above (in case you can figure them out): |
| − | you can figure them out): | ||
# cat /sys/devices/platform/smapi/BAT0/dump | # cat /sys/devices/platform/smapi/BAT0/dump | ||
In all of the above, replace <tt>BAT0</tt> with <tt>BAT1</tt> to address the 2nd battery. | In all of the above, replace <tt>BAT0</tt> with <tt>BAT1</tt> to address the 2nd battery. | ||
| + | |||
| + | {{NOTE|The battery status readout conflicts with the [[HDAPS|hdaps]] driver, and will not be available if <tt>hdaps</tt> has been loaded before <tt>tp_smapi</tt>. See below.}} | ||
====Optical drive control features==== | ====Optical drive control features==== | ||
Revision as of 17:54, 20 December 2005
ThinkPad laptops include a proprietary interface called SMAPI BIOS (System Management Application Program Interface) which provides some hardware control functionality that is not exposed by any other interface (e.g., ACPI).
The SMAPI interfaces changes a lot between models, and is poorly documented, so Linux support is not exhaustive for most models. There are currently two SMAPI access mechanisms available: thinkpad and tpctl for older ThinkPads, and tp_smapi for newer ones.
Contents
Using the tp_smapi module
The tp_smapi kernel module exposes some features of the SMAPI BIOS found on recent ThinkPads via a sysfs interface. Currently, the implemented functionality is control of battery charging (this is useful for increasing battery lifetime or for using a leftover under-spec power supply that can't handle the combined power draw of running and charging), and control of CD/DVD speed.
- Project page: http://tpctl.sourceforge.net/
- You need to donwnload only the tp_smapi kernel module.
Installation
To compile and load the module:
# tar xzvf tp_smapi-0.12.tgz # cd tp_smapi-0.12 # make load
To install permanently (optional):
# make install # modprobe tp_smapi
Battery charge control features
To set the thresholds for starting and stopping battery charging (in percent of current full charge capacity):
# echo 40 > /sys/devices/platform/smapi/BAT0/start_charge_thresh # echo 70 > /sys/devices/platform/smapi/BAT0/stop_charge_thresh # cat /sys/devices/platform/smapi/BAT0/*_charge_thresh 40 70
To unconditionally inhibit charging for 17 minutes:
# echo 17 > /sys/devices/platform/smapi/BAT0/inhibit_charge_minutes
To cancel charge inhibiting:
# echo 0 > /sys/devices/platform/smapi/BAT0/inhibit_charge_minutes
To force battery discharging even if connected to AC, use one of these:
# echo 1 > /sys/devices/platform/smapi/BAT0/force_discharge1 # echo 1 > /sys/devices/platform/smapi/BAT0/force_discharge2
(Probably only one of these will work on your laptop; please check the dmesg output to see which one, and update the status below.)
To cancel forced disharge, use one of these:
# echo 0 > /sys/devices/platform/smapi/BAT0/force_discharge1 # echo 0 > /sys/devices/platform/smapi/BAT0/force_discharge2
Battery status features
To view exteded battery status such as charging state, voltage, current, capacity, cycle count and model information:
# cat /sys/devices/platform/smapi/BAT0/installed # cat /sys/devices/platform/smapi/BAT0/state # idle/charging/discharging # cat /sys/devices/platform/smapi/BAT0/cycle_count # cat /sys/devices/platform/smapi/BAT0/current_now # instantaneous current # cat /sys/devices/platform/smapi/BAT0/current_avg # last minute average # cat /sys/devices/platform/smapi/BAT0/power_now # instantaneous power # cat /sys/devices/platform/smapi/BAT0/power_avg # last minute average # cat /sys/devices/platform/smapi/BAT0/last_full_capacity # cat /sys/devices/platform/smapi/BAT0/remaining_capacity # cat /sys/devices/platform/smapi/BAT0/design_capacity # cat /sys/devices/platform/smapi/BAT0/voltage # cat /sys/devices/platform/smapi/BAT0/design_voltage # cat /sys/devices/platform/smapi/BAT0/manufacturer # cat /sys/devices/platform/smapi/BAT0/model # cat /sys/devices/platform/smapi/BAT0/serial # cat /sys/devices/platform/smapi/BAT0/barcoding # cat /sys/devices/platform/smapi/BAT0/chemistry # cat /sys/devices/platform/smapi/ac_connected
The raw status data is also available, including some fields not in the above (in case you can figure them out):
# cat /sys/devices/platform/smapi/BAT0/dump
In all of the above, replace BAT0 with BAT1 to address the 2nd battery.
Optical drive control features
To control the speed of the optical drive:
# echo 0 yes_crash_my_computer > /sys/devices/platform/smapi/cd_speed # slow # echo 1 yes_crash_my_computer > /sys/devices/platform/smapi/cd_speed # medium # echo 2 yes_crash_my_computer > /sys/devices/platform/smapi/cd_speed # fast # cat /sys/devices/platform/smapi/cd_speed 2
Other features
Other things that can be controlled through SMAPI, but are not supported in this version of the driver, include forcing battery discharge, PCI bus power saving, CPU power saving control and fan control. See the included README file for more information.
Conflict with hdaps
The extended battery status function conflicts with the hdaps kernel module (they use the same IO ports). If you load hdaps first, tp_smapi will disable its battery status functions (and log a message in the kernel log). If you load tp_smapi first, hdaps will refuse to load. Use rmmod to switch between the two.
Some of the battery status is also visible through ACPI (/proc/acpi/battery/*).
The charging control files (*_charge_thresh and inhibit_charge_minutes) don't have this problem.
Model-specific status
| × | start_charge_ thresh |
stop_charge_ thresh |
inhbit_charge_ minutes |
cd_speed (see note above) |
force_ discharge1 |
force_ discharge2 |
battery status files (see note about hdaps above) |
|---|---|---|---|---|---|---|---|
| G41 | yes | no | yes | yes | unknown | unknown | unknown |
| R40 | no | no | no | yes | unknown | unknown | unknown |
| R50p | no | no | no | yes | no | no | yes |
| R51 | yes | no | yes | unknown | unknown | unknown | unknown |
| R52 | yes | yes | yes | yes | unknown | unknown | unknown |
| T40 | no | no | no | yes | unknown | unknown | yes |
| T40p | no | no | no | yes | no | no | yes |
| T41 | yes | no | yes | unknown | unknown | unknown | unknown |
| T41p | no | no | no | yes | unknown | unknown | unknown |
| T42 | yes | no | yes | yes | yes | no | yes |
| T42p | yes | no | yes | unknown | unknown | unknown | unknown |
| T43 | yes | yes | yes | yes | yes | no | yes |
| T43p | yes | yes | yes | yes | yes | no | yes |
| X24 | no | no | no | unknown | unknown | unknown | yes |
| X31 | no | no | no | unknown | unknown | unknown | yes |
| X32 | no | no | no | unknown | unknown | unknown | unknown |
| X40 | yes | no | yes | unknown | unknown | unknown | yes |
| X41 | yes | yes | yes | unknown | unknown | unknown | unknown |
Please update the above and report your experience on the discussion page. If the module loads but gives a "not supported" or "not implementeded" when you try to use some specific file in /sys/devices/platform/smapi/, please report the dmesg output and whether the corresponding functionality is available under Windows - maybe your ThinkPad just can't do that.
Using the thinkpad module
This solution consists of a module, called thinkpad, and a user-space tool caled tpctl. It provides very rich functionality for older ThinkPads, but on newer ThinkPads much of this functionality is exposed and supported through an ACPI interface and the SMAPI access does not work anymore. Kernel 2.6.9 and newer is unsupported; for kernel 2.6.3 and newer you need tpctl >=4.14 and thinkpad >=5.5. For details, see the README and list of supported models.
- Project page: http://tpctl.sourceforge.net/
- You need to download the thinkpad module and tpctl userspace tool.
- There is also an optional GUI: configure-thinkpad.
