Commit Graph

11 Commits

Author SHA1 Message Date
Matthew Garrett 03a971a289 thermal: support forcing support for passive cooling
Due to poor thermal design or Linux driving hardware outside its thermal
envelope, some systems will reach critical temperature and shut down
under high load. This patch adds support for forcing a polling-based
passive trip point if the firmware doesn't provide one. The assumption
is made that the processor is the most practical means to reduce the
dynamic heat generation, so hitting the passive thermal limit will cause
the CPU to be throttled until the temperature stabalises around the
defined value.

UI is provided via a "passive" sysfs entry in the thermal zone
directory. It accepts a decimal value in millidegrees celsius, or "0" to
disable the functionality. Default behaviour is for this functionality
to be disabled.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2009-03-27 16:58:22 -04:00
Matthew Garrett b1569e99c7 ACPI: move thermal trip handling to generic thermal layer
The ACPI code currently carries its own thermal trip handling, meaning that
any other thermal implementation will need to reimplement it. Move the code
to the generic thermal layer.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2009-02-20 18:41:56 -05:00
Matthew Garrett 6503e5df08 thermal: use integers rather than strings for thermal values
The thermal API currently uses strings to pass values to userspace. This
makes it difficult to use from within the kernel. Change the interface
to use integers and fix up the consumers.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>
2009-02-20 10:52:37 -05:00
Rene Herman 16d7523973 thermal: Create CONFIG_THERMAL_HWMON=n
A bug in libsensors <= 2.10.6 is exposed
when this new hwmon I/F is enabled.
Create CONFIG_THERMAL_HWMON=n
until some time after libsensors 2.10.7 ships
so those users can run the latest kernel.

libsensors 3.x is already fixed -- those users
can use CONFIG_THERMAL_HWMON=y now.

Signed-off-by: Rene Herman <rene.herman@gmail.com>
Acked-by: Mark M. Hoffman <mhoffman@lightlink.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-06-25 19:25:42 -04:00
Zhang Rui e68b16abd9 thermal: add hwmon sysfs I/F
Add hwmon sys I/F for generic thermal driver.

Note: we have one hwmon class device for EACH TYPE of the thermal zone device.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-04-29 02:48:01 -04:00
Zhang, Rui 9ec732ff80 thermal: add new get_crit_temp callback
Add a new callback so that the generic thermal can get
the critical trip point info of a thermal zone,
which is needed for building the tempX_crit hwmon sysfs attribute.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-04-29 02:45:49 -04:00
Zhang Rui 63c4ec905d thermal: add the support for building the generic thermal as a module
Build the generic thermal driver as module "thermal_sys".

Make ACPI thermal, video, processor and fan SELECT the generic
thermal driver, as these drivers rely on it to build the sysfs I/F.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-04-29 02:44:00 -04:00
Krzysztof Helt 5f1a3f2ac4 acpi thermal trip points increased to 12
The THERMAL_MAX_TRIPS value is set to 10.  It is too few for the Compaq AP550
machine which has 12 trip points.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Len Brown <lenb@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-15 19:35:41 -07:00
Len Brown a0dd25b2c8 ACPI: thermal: buildfix for CONFIG_THERMAL=n
This fixes the build, but acpi_fan_add() still needs
to be updated to handle thermal_cooling_device_register()
returning NULL as a non-fatal condition.

Signed-off-by: Len Brown <len.brown@intel.com>
2008-02-09 04:01:48 -05:00
Zhang Rui 041d4bbf12 ACPI: CELSIUS_TO_KELVIN fixup
Fix an imprecision in CELSIUS_TO_KELVIN and move these
two macroes to a proper place.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Thomas Sujith <sujith.thomas@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-02-01 23:20:26 -05:00
Zhang Rui 203d3d4aa4 the generic thermal sysfs driver
The Generic Thermal sysfs driver for thermal management.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Thomas Sujith <sujith.thomas@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2008-02-01 23:12:19 -05:00