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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-23 09:26:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-23 09:26:20 -0700
commit6fad2b5b649fa1fa6ee7293222815f5b62499889 (patch)
treec2f9735e8868d3ce5decb5a08c56e1a1cc9730af /Documentation/hwmon/pkgtemp
parent19504828b4bee5e471bcd35e214bc6fd0d380692 (diff)
parent4cc452758fd250bb5968c583d825bb0e68d65db0 (diff)
Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging
* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging: hwmon: (coretemp) Fix checkpatch errors hwmon: Remove pkgtemp driver hwmon: (coretemp) Merge pkgtemp with coretemp hwmon: (pmbus) Add support for Analog Devices ADM1275 hwmon: (pmbus) Support for TI UCD90xxx series Sequencer and System Health Controllers hwmon: (pmbus) Add support for TI UCD9200 series of PWM System Controllers hwmon: (pmbus) Use device specific function to read fan configuration hwmon: (pmbus) Expand scope of device specific get_status function hwmon: (pmbus) Introduce infrastructure to detect sensors and limit registers hwmon: Driver for MAX16065 System Manager and compatibles hwmon: (sht15) add support for CRC validation hwmon: (sht15) add support for the status register hwmon: (sht15) clean-up the probe function hwmon: (sht15) general code clean-up hwmon: Add support for MAX6642
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diff --git a/Documentation/hwmon/pkgtemp b/Documentation/hwmon/pkgtemp
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-Kernel driver pkgtemp
-======================
-
-Supported chips:
- * Intel family
- Prefix: 'pkgtemp'
- CPUID:
- Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
- Volume 3A: System Programming Guide
-
-Author: Fenghua Yu
-
-Description
------------
-
-This driver permits reading package level temperature sensor embedded inside
-Intel CPU package. The sensors can be in core, uncore, memory controller, or
-other components in a package. The feature is first implemented in Intel Sandy
-Bridge platform.
-
-Temperature is measured in degrees Celsius and measurement resolution is
-1 degree C. Valid temperatures are from 0 to TjMax degrees C, because the actual
-value of temperature register is in fact a delta from TjMax.
-
-Temperature known as TjMax is the maximum junction temperature of package.
-We get this from MSR_IA32_TEMPERATURE_TARGET. If the MSR is not accessible,
-we define TjMax as 100 degrees Celsius. At this temperature, protection
-mechanism will perform actions to forcibly cool down the package. Alarm
-may be raised, if the temperature grows enough (more than TjMax) to trigger
-the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
-
-temp1_input - Package temperature (in millidegrees Celsius).
-temp1_max - All cooling devices should be turned on.
-temp1_crit - Maximum junction temperature (in millidegrees Celsius).
-temp1_crit_alarm - Set when Out-of-spec bit is set, never clears.
- Correct CPU operation is no longer guaranteed.