mirror/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

ACPI: thinkpad-acpi: add a fan-control feature master toggle

Browse Source 
Len Brown considers that an active by default fan control interface in
laptops may be too close to giving users enough rope.  There is a good
chance he is quite correct on this, especially if someone decides to use
that interface in applets and users are not aware of its risks.

This patch adds a master switch to thinkpad-acpi that enables or disables
the entire fan-control feature as a module parameter: "fan_control".  It
defaults to disabled.  Set it to non-zero to enable fan control.

Also, the patch removes the expermiental status from fan control, since it
is stable enough to not be called experimental, and the master switch makes
it safe enough to do so.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh
2007-04-27 22:00:09 -03:00
committed by Len Brown
parent 7d5a015eec
commit ecf2a80a97
3 changed files with 38 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
Documentation/thinkpad-acpi.txt
View File

@@ -38,7 +38,7 @@ detailed description):
- Experimental: embedded controller register dump
- LCD brightness control
- Volume control
- Experimental: fan speed, fan enable/disable
- Fan control and monitoring: fan speed, fan enable/disable
- Experimental: WAN enable and disable
A compatibility table by model and feature is maintained on the web
@@ -681,21 +681,20 @@ distinct. The unmute the volume after the mute command, use either the
up or down command (the level command will not unmute the volume).
The current volume level and mute state is shown in the file.
EXPERIMENTAL: fan speed, fan enable/disable
-------------------------------------------
Fan control and monitoring: fan speed, fan enable/disable
---------------------------------------------------------
procfs: /proc/acpi/ibm/fan
sysfs device attributes: (hwmon) fan_input, pwm1, pwm1_enable
This feature is marked EXPERIMENTAL because the implementation
directly accesses hardware registers and may not work as expected. USE
WITH CAUTION! To use this feature, you need to supply the
experimental=1 parameter when loading the module.
NOTE NOTE NOTE: fan control operations are disabled by default for
safety reasons. To enable them, the module parameter "fan_control=1"
must be given to thinkpad-acpi.
This feature attempts to show the current fan speed, control mode and
other fan data that might be available. The speed is read directly
from the hardware registers of the embedded controller. This is known
to work on later R, T and X series ThinkPads but may show a bogus
to work on later R, T, X and Z series ThinkPads but may show a bogus
value on other models.
Fan levels: