path: root/Documentation
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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-21 16:37:42 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-21 16:37:42 -0800
commitbfe38ccf8d0b541f387f65267f6f3794be59233a (patch)
treec1f5cece3247431b3d2c484da831d2eb0fd6c9e0 /Documentation
parent20f8d2a49360980f1dc0afe2ea227e3ba887e575 (diff)
parent25e9c86d5a6d82ea45eb680fc66bf73ac5e50dff (diff)
Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6
* 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6: hwmon: normal_i2c arrays should be const hwmon: New driver for Analog Devices ADT7473 sensor chip hwmon: (coretemp) Add Penryn CPU to coretemp hwmon: (coretemp) Add TjMax detection for mobile CPUs hwmon: (applesmc) sensors set for MacBook2 hwmon: (thmc50) Storage class should be before const qualifier hwmon: (coretemp) fix section mismatch warning hwmon: (coretemp) Add maximum cooling temperature readout hwmon: (adm1026) Properly terminate sysfs groups hwmon: (vt8231) Update maintainer email address hwmon: (vt8231) Add individual alarm files hwmon: (via686a) Add individual alarm files hwmon: (smsc47m1) Add individual alarm files hwmon: (max1619) Add individual alarm and fault files hwmon: (lm92) Add individual alarm files
Diffstat (limited to 'Documentation')
2 files changed, 83 insertions, 2 deletions
diff --git a/Documentation/hwmon/adt7473 b/Documentation/hwmon/adt7473
new file mode 100644
index 00000000000..22d8b19046a
--- /dev/null
+++ b/Documentation/hwmon/adt7473
@@ -0,0 +1,79 @@
+Kernel driver adt7473
+Supported chips:
+ * Analog Devices ADT7473
+ Prefix: 'adt7473'
+ Addresses scanned: I2C 0x2C, 0x2D, 0x2E
+ Datasheet: Publicly available at the Analog Devices website
+Author: Darrick J. Wong
+This driver implements support for the Analog Devices ADT7473 chip family.
+The LM85 uses the 2-wire interface compatible with the SMBUS 2.0
+specification. Using an analog to digital converter it measures three (3)
+temperatures and two (2) voltages. It has three (3) 16-bit counters for
+measuring fan speed. There are three (3) PWM outputs that can be used
+to control fan speed.
+A sophisticated control system for the PWM outputs is designed into the
+LM85 that allows fan speed to be adjusted automatically based on any of the
+three temperature sensors. Each PWM output is individually adjustable and
+programmable. Once configured, the ADT7473 will adjust the PWM outputs in
+response to the measured temperatures without further host intervention.
+This feature can also be disabled for manual control of the PWM's.
+Each of the measured inputs (voltage, temperature, fan speed) has
+corresponding high/low limit values. The ADT7473 will signal an ALARM if
+any measured value exceeds either limit.
+The ADT7473 samples all inputs continuously. The driver will not read
+the registers more often than once every other second. Further,
+configuration data is only read once per minute.
+Special Features
+The ADT7473 have a 10-bit ADC and can therefore measure temperatures
+with 0.25 degC resolution. Temperature readings can be configured either
+for twos complement format or "Offset 64" format, wherein 63 is subtracted
+from the raw value to get the temperature value.
+The Analog Devices datasheet is very detailed and describes a procedure for
+determining an optimal configuration for the automatic PWM control.
+Hardware Configurations
+The ADT7473 chips have an optional SMBALERT output that can be used to
+signal the chipset in case a limit is exceeded or the temperature sensors
+fail. Individual sensor interrupts can be masked so they won't trigger
+SMBALERT. The SMBALERT output if configured replaces the PWM2 function.
+Configuration Notes
+Besides standard interfaces driver adds the following:
+* PWM Control
+* pwm#_auto_point1_pwm and pwm#_auto_point1_temp and
+* pwm#_auto_point2_pwm and pwm#_auto_point2_temp -
+point1: Set the pwm speed at a lower temperature bound.
+point2: Set the pwm speed at a higher temperature bound.
+The ADT7473 will scale the pwm between the lower and higher pwm speed when
+the temperature is between the two temperature boundaries. PWM values range
+from 0 (off) to 255 (full speed).
+The NVIDIA binary driver presents an ADT7473 chip via an on-card i2c bus.
+Unfortunately, they fail to set the i2c adapter class, so this driver may
+fail to find the chip until the nvidia driver is patched.
diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp
index 170bf862437..dbbe6c7025b 100644
--- a/Documentation/hwmon/coretemp
+++ b/Documentation/hwmon/coretemp
@@ -4,9 +4,10 @@ Kernel driver coretemp
Supported chips:
* All Intel Core family
Prefix: 'coretemp'
- CPUID: family 0x6, models 0xe, 0xf, 0x16
+ CPUID: family 0x6, models 0xe, 0xf, 0x16, 0x17
Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
Volume 3A: System Programming Guide
+ http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
Author: Rudolf Marek
@@ -25,7 +26,8 @@ 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 - Core temperature (in millidegrees Celsius).
-temp1_crit - Maximum junction temperature (in millidegrees Celsius).
+temp1_max - All cooling devices should be turned on (on Core2).
+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.
temp1_label - Contains string "Core X", where X is processor