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[PATCH] I2C: Move hwmon drivers (3/3)

Browse Source 
Part 3: Move the drivers documentation, plus two general documentation
files.

Note that the patch "adds trailing whitespace", because it does move the
files as-is, and some files happen to have trailing whitespace.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jean Delvare
2005-07-02 18:52:48 +02:00
committed by Greg Kroah-Hartman
parent 8d5d45fb14
commit ede7fbdf52
31 changed files with 0 additions and 0 deletions
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Documentation/hwmon/adm1021
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Kernel driver adm1021
=====================
Supported chips:
* Analog Devices ADM1021
Prefix: 'adm1021'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the Analog Devices website
* Analog Devices ADM1021A/ADM1023
Prefix: 'adm1023'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the Analog Devices website
* Genesys Logic GL523SM
Prefix: 'gl523sm'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet:
* Intel Xeon Processor
Prefix: - any other - may require 'force_adm1021' parameter
Addresses scanned: none
Datasheet: Publicly available at Intel website
* Maxim MAX1617
Prefix: 'max1617'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the Maxim website
* Maxim MAX1617A
Prefix: 'max1617a'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the Maxim website
* National Semiconductor LM84
Prefix: 'lm84'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the National Semiconductor website
* Philips NE1617
Prefix: 'max1617' (probably detected as a max1617)
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the Philips website
* Philips NE1617A
Prefix: 'max1617' (probably detected as a max1617)
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the Philips website
* TI THMC10
Prefix: 'thmc10'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the TI website
* Onsemi MC1066
Prefix: 'mc1066'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the Onsemi website
Authors:
Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>
Module Parameters
-----------------
* read_only: int
Don't set any values, read only mode
Description
-----------
The chips supported by this driver are very similar. The Maxim MAX1617 is
the oldest; it has the problem that it is not very well detectable. The
MAX1617A solves that. The ADM1021 is a straight clone of the MAX1617A.
Ditto for the THMC10. From here on, we will refer to all these chips as
ADM1021-clones.
The ADM1021 and MAX1617A reports a die code, which is a sort of revision
code. This can help us pinpoint problems; it is not very useful
otherwise.
ADM1021-clones implement two temperature sensors. One of them is internal,
and measures the temperature of the chip itself; the other is external and
is realised in the form of a transistor-like device. A special alarm
indicates whether the remote sensor is connected.
Each sensor has its own low and high limits. When they are crossed, the
corresponding alarm is set and remains on as long as the temperature stays
out of range. Temperatures are measured in degrees Celsius. Measurements
are possible between -65 and +127 degrees, with a resolution of one degree.
If an alarm triggers, it will remain triggered until the hardware register
is read at least once. This means that the cause for the alarm may already
have disappeared!
This driver only updates its values each 1.5 seconds; reading it more often
will do no harm, but will return 'old' values. It is possible to make
ADM1021-clones do faster measurements, but there is really no good reason
for that.
Xeon support
------------
Some Xeon processors have real max1617, adm1021, or compatible chips
within them, with two temperature sensors.
Other Xeons have chips with only one sensor.
If you have a Xeon, and the adm1021 module loads, and both temperatures
appear valid, then things are good.
If the adm1021 module doesn't load, you should try this:
modprobe adm1021 force_adm1021=BUS,ADDRESS
ADDRESS can only be 0x18, 0x1a, 0x29, 0x2b, 0x4c, or 0x4e.
If you have dual Xeons you may have appear to have two separate
adm1021-compatible chips, or two single-temperature sensors, at distinct
addresses.
Documentation/hwmon/adm1025
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Kernel driver adm1025
=====================
Supported chips:
* Analog Devices ADM1025, ADM1025A
Prefix: 'adm1025'
Addresses scanned: I2C 0x2c - 0x2e
Datasheet: Publicly available at the Analog Devices website
* Philips NE1619
Prefix: 'ne1619'
Addresses scanned: I2C 0x2c - 0x2d
Datasheet: Publicly available at the Philips website
The NE1619 presents some differences with the original ADM1025:
* Only two possible addresses (0x2c - 0x2d).
* No temperature offset register, but we don't use it anyway.
* No INT mode for pin 16. We don't play with it anyway.
Authors:
Chen-Yuan Wu <gwu@esoft.com>,
Jean Delvare <khali@linux-fr.org>
Description
-----------
(This is from Analog Devices.) The ADM1025 is a complete system hardware
monitor for microprocessor-based systems, providing measurement and limit
comparison of various system parameters. Five voltage measurement inputs
are provided, for monitoring +2.5V, +3.3V, +5V and +12V power supplies and
the processor core voltage. The ADM1025 can monitor a sixth power-supply
voltage by measuring its own VCC. One input (two pins) is dedicated to a
remote temperature-sensing diode and an on-chip temperature sensor allows
ambient temperature to be monitored.
One specificity of this chip is that the pin 11 can be hardwired in two
different manners. It can act as the +12V power-supply voltage analog
input, or as the a fifth digital entry for the VID reading (bit 4). It's
kind of strange since both are useful, and the reason for designing the
chip that way is obscure at least to me. The bit 5 of the configuration
register can be used to define how the chip is hardwired. Please note that
it is not a choice you have to make as the user. The choice was already
made by your motherboard's maker. If the configuration bit isn't set
properly, you'll have a wrong +12V reading or a wrong VID reading. The way
the driver handles that is to preserve this bit through the initialization
process, assuming that the BIOS set it up properly beforehand. If it turns
out not to be true in some cases, we'll provide a module parameter to force
modes.
This driver also supports the ADM1025A, which differs from the ADM1025
only in that it has "open-drain VID inputs while the ADM1025 has on-chip
100k pull-ups on the VID inputs". It doesn't make any difference for us.
Documentation/hwmon/adm1026
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Kernel driver adm1026
=====================
Supported chips:
* Analog Devices ADM1026
Prefix: 'adm1026'
Addresses scanned: I2C 0x2c, 0x2d, 0x2e
Datasheet: Publicly available at the Analog Devices website
http://www.analog.com/en/prod/0,,766_825_ADM1026,00.html
Authors:
Philip Pokorny <ppokorny@penguincomputing.com> for Penguin Computing
Justin Thiessen <jthiessen@penguincomputing.com>
Module Parameters
-----------------
* gpio_input: int array (min = 1, max = 17)
List of GPIO pins (0-16) to program as inputs
* gpio_output: int array (min = 1, max = 17)
List of GPIO pins (0-16) to program as outputs
* gpio_inverted: int array (min = 1, max = 17)
List of GPIO pins (0-16) to program as inverted
* gpio_normal: int array (min = 1, max = 17)
List of GPIO pins (0-16) to program as normal/non-inverted
* gpio_fan: int array (min = 1, max = 8)
List of GPIO pins (0-7) to program as fan tachs
Description
-----------
This driver implements support for the Analog Devices ADM1026. Analog
Devices calls it a "complete thermal system management controller."
The ADM1026 implements three (3) temperature sensors, 17 voltage sensors,
16 general purpose digital I/O lines, eight (8) fan speed sensors (8-bit),
an analog output and a PWM output along with limit, alarm and mask bits for
all of the above. There is even 8k bytes of EEPROM memory on chip.
Temperatures are measured in degrees Celsius. There are two external
sensor inputs and one internal sensor. Each sensor has a high and low
limit. If the limit is exceeded, an interrupt (#SMBALERT) can be
generated. The interrupts can be masked. In addition, there are over-temp
limits for each sensor. If this limit is exceeded, the #THERM output will
be asserted. The current temperature and limits have a resolution of 1
degree.
Fan rotation speeds are reported in RPM (rotations per minute) but measured
in counts of a 22.5kHz internal clock. Each fan has a high limit which
corresponds to a minimum fan speed. If the limit is exceeded, an interrupt
can be generated. Each fan can be programmed to divide the reference clock
by 1, 2, 4 or 8. Not all RPM values can accurately be represented, so some
rounding is done. With a divider of 8, the slowest measurable speed of a
two pulse per revolution fan is 661 RPM.
There are 17 voltage sensors. An alarm is triggered if the voltage has
crossed a programmable minimum or maximum limit. Note that minimum in this
case always means 'closest to zero'; this is important for negative voltage
measurements. Several inputs have integrated attenuators so they can measure
higher voltages directly. 3.3V, 5V, 12V, -12V and battery voltage all have
dedicated inputs. There are several inputs scaled to 0-3V full-scale range
for SCSI terminator power. The remaining inputs are not scaled and have
a 0-2.5V full-scale range. A 2.5V or 1.82V reference voltage is provided
for negative voltage measurements.
If an alarm triggers, it will remain triggered until the hardware register
is read at least once. This means that the cause for the alarm may already
have disappeared! Note that in the current implementation, all hardware
registers are read whenever any data is read (unless it is less than 2.0
seconds since the last update). This means that you can easily miss
once-only alarms.
The ADM1026 measures continuously. Analog inputs are measured about 4
times a second. Fan speed measurement time depends on fan speed and
divisor. It can take as long as 1.5 seconds to measure all fan speeds.
The ADM1026 has the ability to automatically control fan speed based on the
temperature sensor inputs. Both the PWM output and the DAC output can be
used to control fan speed. Usually only one of these two outputs will be
used. Write the minimum PWM or DAC value to the appropriate control
register. Then set the low temperature limit in the tmin values for each
temperature sensor. The range of control is fixed at 20 °C, and the
largest difference between current and tmin of the temperature sensors sets
the control output. See the datasheet for several example circuits for
controlling fan speed with the PWM and DAC outputs. The fan speed sensors
do not have PWM compensation, so it is probably best to control the fan
voltage from the power lead rather than on the ground lead.
The datasheet shows an example application with VID signals attached to
GPIO lines. Unfortunately, the chip may not be connected to the VID lines
in this way. The driver assumes that the chips *is* connected this way to
get a VID voltage.
Documentation/hwmon/adm1031
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Kernel driver adm1031
=====================
Supported chips:
* Analog Devices ADM1030
Prefix: 'adm1030'
Addresses scanned: I2C 0x2c to 0x2e
Datasheet: Publicly available at the Analog Devices website
http://products.analog.com/products/info.asp?product=ADM1030
* Analog Devices ADM1031
Prefix: 'adm1031'
Addresses scanned: I2C 0x2c to 0x2e
Datasheet: Publicly available at the Analog Devices website
http://products.analog.com/products/info.asp?product=ADM1031
Authors:
Alexandre d'Alton <alex@alexdalton.org>
Jean Delvare <khali@linux-fr.org>
Description
-----------
The ADM1030 and ADM1031 are digital temperature sensors and fan controllers.
They sense their own temperature as well as the temperature of up to one
(ADM1030) or two (ADM1031) external diodes.
All temperature values are given in degrees Celsius. Resolution is 0.5
degree for the local temperature, 0.125 degree for the remote temperatures.
Each temperature channel has its own high and low limits, plus a critical
limit.
The ADM1030 monitors a single fan speed, while the ADM1031 monitors up to
two. Each fan channel has its own low speed limit.
Documentation/hwmon/adm9240
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Kernel driver adm9240
=====================
Supported chips:
* Analog Devices ADM9240
Prefix: 'adm9240'
Addresses scanned: I2C 0x2c - 0x2f
Datasheet: Publicly available at the Analog Devices website
http://www.analog.com/UploadedFiles/Data_Sheets/79857778ADM9240_0.pdf
* Dallas Semiconductor DS1780
Prefix: 'ds1780'
Addresses scanned: I2C 0x2c - 0x2f
Datasheet: Publicly available at the Dallas Semiconductor (Maxim) website
http://pdfserv.maxim-ic.com/en/ds/DS1780.pdf
* National Semiconductor LM81
Prefix: 'lm81'
Addresses scanned: I2C 0x2c - 0x2f
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/ds.cgi/LM/LM81.pdf
Authors:
Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>,
Michiel Rook <michiel@grendelproject.nl>,
Grant Coady <gcoady@gmail.com> with guidance
from Jean Delvare <khali@linux-fr.org>
Interface
---------
The I2C addresses listed above assume BIOS has not changed the
chip MSB 5-bit address. Each chip reports a unique manufacturer
identification code as well as the chip revision/stepping level.
Description
-----------
[From ADM9240] The ADM9240 is a complete system hardware monitor for
microprocessor-based systems, providing measurement and limit comparison
of up to four power supplies and two processor core voltages, plus
temperature, two fan speeds and chassis intrusion. Measured values can
be read out via an I2C-compatible serial System Management Bus, and values
for limit comparisons can be programmed in over the same serial bus. The
high speed successive approximation ADC allows frequent sampling of all
analog channels to ensure a fast interrupt response to any out-of-limit
measurement.
The ADM9240, DS1780 and LM81 are register compatible, the following
details are common to the three chips. Chip differences are described
after this section.
Measurements
------------
The measurement cycle
The adm9240 driver will take a measurement reading no faster than once
each two seconds. User-space may read sysfs interface faster than the
measurement update rate and will receive cached data from the most
recent measurement.
ADM9240 has a very fast 320us temperature and voltage measurement cycle
with independent fan speed measurement cycles counting alternating rising
edges of the fan tacho inputs.
DS1780 measurement cycle is about once per second including fan speed.
LM81 measurement cycle is about once per 400ms including fan speed.
The LM81 12-bit extended temperature measurement mode is not supported.
Temperature
-----------
On chip temperature is reported as degrees Celsius as 9-bit signed data
with resolution of 0.5 degrees Celsius. High and low temperature limits
are 8-bit signed data with resolution of one degree Celsius.
Temperature alarm is asserted once the temperature exceeds the high limit,
and is cleared when the temperature falls below the temp1_max_hyst value.
Fan Speed
---------
Two fan tacho inputs are provided, the ADM9240 gates an internal 22.5kHz
clock via a divider to an 8-bit counter. Fan speed (rpm) is calculated by:
rpm = (22500 * 60) / (count * divider)
Automatic fan clock divider
* User sets 0 to fan_min limit
- low speed alarm is disabled
- fan clock divider not changed
- auto fan clock adjuster enabled for valid fan speed reading
* User sets fan_min limit too low
- low speed alarm is enabled
- fan clock divider set to max
- fan_min set to register value 254 which corresponds
to 664 rpm on adm9240
- low speed alarm will be asserted if fan speed is
less than minimum measurable speed
- auto fan clock adjuster disabled
* User sets reasonable fan speed
- low speed alarm is enabled
- fan clock divider set to suit fan_min
- auto fan clock adjuster enabled: adjusts fan_min
* User sets unreasonably high low fan speed limit
- resolution of the low speed limit may be reduced
- alarm will be asserted
- auto fan clock adjuster enabled: adjusts fan_min
* fan speed may be displayed as zero until the auto fan clock divider
adjuster brings fan speed clock divider back into chip measurement
range, this will occur within a few measurement cycles.
Analog Output
-------------
An analog output provides a 0 to 1.25 volt signal intended for an external
fan speed amplifier circuit. The analog output is set to maximum value on
power up or reset. This doesn't do much on the test Intel SE440BX-2.
Voltage Monitor
Voltage (IN) measurement is internally scaled:
nr label nominal maximum resolution
mV mV mV
0 +2.5V 2500 3320 13.0
1 Vccp1 2700 3600 14.1
2 +3.3V 3300 4380 17.2
3 +5V 5000 6640 26.0
4 +12V 12000 15940 62.5
5 Vccp2 2700 3600 14.1
The reading is an unsigned 8-bit value, nominal voltage measurement is
represented by a reading of 192, being 3/4 of the measurement range.
An alarm is asserted for any voltage going below or above the set limits.
The driver reports and accepts voltage limits scaled to the above table.
VID Monitor
-----------
The chip has five inputs to read the 5-bit VID and reports the mV value
based on detected CPU type.
Chassis Intrusion
-----------------
An alarm is asserted when the CI pin goes active high. The ADM9240
Datasheet has an example of an external temperature sensor driving
this pin. On an Intel SE440BX-2 the Chassis Intrusion header is
connected to a normally open switch.
The ADM9240 provides an internal open drain on this line, and may output
a 20 ms active low pulse to reset an external Chassis Intrusion latch.
Clear the CI latch by writing value 1 to the sysfs chassis_clear file.
Alarm flags reported as 16-bit word
bit label comment
--- ------------- --------------------------
0 +2.5 V_Error high or low limit exceeded
1 VCCP_Error high or low limit exceeded
2 +3.3 V_Error high or low limit exceeded
3 +5 V_Error high or low limit exceeded
4 Temp_Error temperature error
6 FAN1_Error fan low limit exceeded
7 FAN2_Error fan low limit exceeded
8 +12 V_Error high or low limit exceeded
9 VCCP2_Error high or low limit exceeded
12 Chassis_Error CI pin went high
Remaining bits are reserved and thus undefined. It is important to note
that alarm bits may be cleared on read, user-space may latch alarms and
provide the end-user with a method to clear alarm memory.
Documentation/hwmon/asb100
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Kernel driver asb100
====================
Supported Chips:
* Asus ASB100 and ASB100-A "Bach"
Prefix: 'asb100'
Addresses scanned: I2C 0x2d
Datasheet: none released
Author: Mark M. Hoffman <mhoffman@lightlink.com>
Description
-----------
This driver implements support for the Asus ASB100 and ASB100-A "Bach".
These are custom ASICs available only on Asus mainboards. Asus refuses to
supply a datasheet for these chips. Thanks go to many people who helped
investigate their hardware, including:
Vitaly V. Bursov
Alexander van Kaam (author of MBM for Windows)
Bertrik Sikken
The ASB100 implements seven voltage sensors, three fan rotation speed
sensors, four temperature sensors, VID lines and alarms. In addition to
these, the ASB100-A also implements a single PWM controller for fans 2 and
3 (i.e. one setting controls both.) If you have a plain ASB100, the PWM
controller will simply not work (or maybe it will for you... it doesn't for
me).
Temperatures are measured and reported in degrees Celsius.
Fan speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit.
Voltage sensors (also known as IN sensors) report values in volts.
The VID lines encode the core voltage value: the voltage level your
processor should work with. This is hardcoded by the mainboard and/or
processor itself. It is a value in volts.
Alarms: (TODO question marks indicate may or may not work)
0x0001 => in0 (?)
0x0002 => in1 (?)
0x0004 => in2
0x0008 => in3
0x0010 => temp1 (1)
0x0020 => temp2
0x0040 => fan1
0x0080 => fan2
0x0100 => in4
0x0200 => in5 (?) (2)
0x0400 => in6 (?) (2)
0x0800 => fan3
0x1000 => chassis switch
0x2000 => temp3
Alarm Notes:
(1) This alarm will only trigger if the hysteresis value is 127C.
I.e. it behaves the same as w83781d.
(2) The min and max registers for these values appear to
be read-only or otherwise stuck at 0x00.
TODO:
* Experiment with fan divisors > 8.
* Experiment with temp. sensor types.
* Are there really 13 voltage inputs? Probably not...
* Cleanups, no doubt...
Documentation/hwmon/ds1621
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Kernel driver ds1621
====================
Supported chips:
* Dallas Semiconductor DS1621
Prefix: 'ds1621'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the Dallas Semiconductor website
http://www.dalsemi.com/
* Dallas Semiconductor DS1625
Prefix: 'ds1621'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the Dallas Semiconductor website
http://www.dalsemi.com/
Authors:
Christian W. Zuckschwerdt <zany@triq.net>
valuable contributions by Jan M. Sendler <sendler@sendler.de>
ported to 2.6 by Aurelien Jarno <aurelien@aurel32.net>
with the help of Jean Delvare <khali@linux-fr.org>
Module Parameters
------------------
* polarity int
Output's polarity: 0 = active high, 1 = active low
Description
-----------
The DS1621 is a (one instance) digital thermometer and thermostat. It has
both high and low temperature limits which can be user defined (i.e.
programmed into non-volatile on-chip registers). Temperature range is -55
degree Celsius to +125 in 0.5 increments. You may convert this into a
Fahrenheit range of -67 to +257 degrees with 0.9 steps. If polarity
parameter is not provided, original value is used.
As for the thermostat, behavior can also be programmed using the polarity
toggle. On the one hand ("heater"), the thermostat output of the chip,
Tout, will trigger when the low limit temperature is met or underrun and
stays high until the high limit is met or exceeded. On the other hand
("cooler"), vice versa. That way "heater" equals "active low", whereas
"conditioner" equals "active high". Please note that the DS1621 data sheet
is somewhat misleading in this point since setting the polarity bit does
not simply invert Tout.
A second thing is that, during extensive testing, Tout showed a tolerance
of up to +/- 0.5 degrees even when compared against precise temperature
readings. Be sure to have a high vs. low temperature limit gap of al least
1.0 degree Celsius to avoid Tout "bouncing", though!
As for alarms, you can read the alarm status of the DS1621 via the 'alarms'
/sys file interface. The result consists mainly of bit 6 and 5 of the
configuration register of the chip; bit 6 (0x40 or 64) is the high alarm
bit and bit 5 (0x20 or 32) the low one. These bits are set when the high or
low limits are met or exceeded and are reset by the module as soon as the
respective temperature ranges are left.
The alarm registers are in no way suitable to find out about the actual
status of Tout. They will only tell you about its history, whether or not
any of the limits have ever been met or exceeded since last power-up or
reset. Be aware: When testing, it showed that the status of Tout can change
with neither of the alarms set.
Temperature conversion of the DS1621 takes up to 1000ms; internal access to
non-volatile registers may last for 10ms or below.
High Accuracy Temperature Reading
---------------------------------
As said before, the temperature issued via the 9-bit i2c-bus data is
somewhat arbitrary. Internally, the temperature conversion is of a
different kind that is explained (not so...) well in the DS1621 data sheet.
To cut the long story short: Inside the DS1621 there are two oscillators,
both of them biassed by a temperature coefficient.
Higher resolution of the temperature reading can be achieved using the
internal projection, which means taking account of REG_COUNT and REG_SLOPE
(the driver manages them):
Taken from Dallas Semiconductors App Note 068: 'Increasing Temperature
Resolution on the DS1620' and App Note 105: 'High Resolution Temperature
Measurement with Dallas Direct-to-Digital Temperature Sensors'
- Read the 9-bit temperature and strip the LSB (Truncate the .5 degs)
- The resulting value is TEMP_READ.
- Then, read REG_COUNT.
- And then, REG_SLOPE.
TEMP = TEMP_READ - 0.25 + ((REG_SLOPE - REG_COUNT) / REG_SLOPE)
Note that this is what the DONE bit in the DS1621 configuration register is
good for: Internally, one temperature conversion takes up to 1000ms. Before
that conversion is complete you will not be able to read valid things out
of REG_COUNT and REG_SLOPE. The DONE bit, as you may have guessed by now,
tells you whether the conversion is complete ("done", in plain English) and
thus, whether the values you read are good or not.
The DS1621 has two modes of operation: "Continuous" conversion, which can
be understood as the default stand-alone mode where the chip gets the
temperature and controls external devices via its Tout pin or tells other
i2c's about it if they care. The other mode is called "1SHOT", that means
that it only figures out about the temperature when it is explicitly told
to do so; this can be seen as power saving mode.
Now if you want to read REG_COUNT and REG_SLOPE, you have to either stop
the continuous conversions until the contents of these registers are valid,
or, in 1SHOT mode, you have to have one conversion made.
Documentation/hwmon/fscher
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Kernel driver fscher
====================
Supported chips:
* Fujitsu-Siemens Hermes chip
Prefix: 'fscher'
Addresses scanned: I2C 0x73
Authors:
Reinhard Nissl <rnissl@gmx.de> based on work
from Hermann Jung <hej@odn.de>,
Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>
Description
-----------
This driver implements support for the Fujitsu-Siemens Hermes chip. It is
described in the 'Register Set Specification BMC Hermes based Systemboard'
from Fujitsu-Siemens.
The Hermes chip implements a hardware-based system management, e.g. for
controlling fan speed and core voltage. There is also a watchdog counter on
the chip which can trigger an alarm and even shut the system down.
The chip provides three temperature values (CPU, motherboard and
auxiliary), three voltage values (+12V, +5V and battery) and three fans
(power supply, CPU and auxiliary).
Temperatures are measured in degrees Celsius. The resolution is 1 degree.
Fan rotation speeds are reported in RPM (rotations per minute). The value
can be divided by a programmable divider (1, 2 or 4) which is stored on
the chip.
Voltage sensors (also known as "in" sensors) report their values in volts.
All values are reported as final values from the driver. There is no need
for further calculations.
Detailed description
--------------------
Below you'll find a single line description of all the bit values. With
this information, you're able to decode e. g. alarms, wdog, etc. To make
use of the watchdog, you'll need to set the watchdog time and enable the
watchdog. After that it is necessary to restart the watchdog time within
the specified period of time, or a system reset will occur.
* revision
READING & 0xff = 0x??: HERMES revision identification
* alarms
READING & 0x80 = 0x80: CPU throttling active
READING & 0x80 = 0x00: CPU running at full speed
READING & 0x10 = 0x10: software event (see control:1)
READING & 0x10 = 0x00: no software event
READING & 0x08 = 0x08: watchdog event (see wdog:2)
READING & 0x08 = 0x00: no watchdog event
READING & 0x02 = 0x02: thermal event (see temp*:1)
READING & 0x02 = 0x00: no thermal event
READING & 0x01 = 0x01: fan event (see fan*:1)
READING & 0x01 = 0x00: no fan event
READING & 0x13 ! 0x00: ALERT LED is flashing
* control
READING & 0x01 = 0x01: software event
READING & 0x01 = 0x00: no software event
WRITING & 0x01 = 0x01: set software event
WRITING & 0x01 = 0x00: clear software event
* watchdog_control
READING & 0x80 = 0x80: power off on watchdog event while thermal event
READING & 0x80 = 0x00: watchdog power off disabled (just system reset enabled)
READING & 0x40 = 0x40: watchdog timebase 60 seconds (see also wdog:1)
READING & 0x40 = 0x00: watchdog timebase 2 seconds
READING & 0x10 = 0x10: watchdog enabled
READING & 0x10 = 0x00: watchdog disabled
WRITING & 0x80 = 0x80: enable "power off on watchdog event while thermal event"
WRITING & 0x80 = 0x00: disable "power off on watchdog event while thermal event"
WRITING & 0x40 = 0x40: set watchdog timebase to 60 seconds
WRITING & 0x40 = 0x00: set watchdog timebase to 2 seconds
WRITING & 0x20 = 0x20: disable watchdog
WRITING & 0x10 = 0x10: enable watchdog / restart watchdog time
* watchdog_state
READING & 0x02 = 0x02: watchdog system reset occurred
READING & 0x02 = 0x00: no watchdog system reset occurred
WRITING & 0x02 = 0x02: clear watchdog event
* watchdog_preset
READING & 0xff = 0x??: configured watch dog time in units (see wdog:3 0x40)
WRITING & 0xff = 0x??: configure watch dog time in units
* in* (0: +5V, 1: +12V, 2: onboard 3V battery)
READING: actual voltage value
* temp*_status (1: CPU sensor, 2: onboard sensor, 3: auxiliary sensor)
READING & 0x02 = 0x02: thermal event (overtemperature)
READING & 0x02 = 0x00: no thermal event
READING & 0x01 = 0x01: sensor is working
READING & 0x01 = 0x00: sensor is faulty
WRITING & 0x02 = 0x02: clear thermal event
* temp*_input (1: CPU sensor, 2: onboard sensor, 3: auxiliary sensor)
READING: actual temperature value
* fan*_status (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
READING & 0x04 = 0x04: fan event (fan fault)
READING & 0x04 = 0x00: no fan event
WRITING & 0x04 = 0x04: clear fan event
* fan*_div (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
Divisors 2,4 and 8 are supported, both for reading and writing
* fan*_pwm (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
READING & 0xff = 0x00: fan may be switched off
READING & 0xff = 0x01: fan must run at least at minimum speed (supply: 6V)
READING & 0xff = 0xff: fan must run at maximum speed (supply: 12V)
READING & 0xff = 0x??: fan must run at least at given speed (supply: 6V..12V)
WRITING & 0xff = 0x00: fan may be switched off
WRITING & 0xff = 0x01: fan must run at least at minimum speed (supply: 6V)
WRITING & 0xff = 0xff: fan must run at maximum speed (supply: 12V)
WRITING & 0xff = 0x??: fan must run at least at given speed (supply: 6V..12V)
* fan*_input (1: power supply fan, 2: CPU fan, 3: auxiliary fan)
READING: actual RPM value
Limitations
-----------
* Measuring fan speed
It seems that the chip counts "ripples" (typical fans produce 2 ripples per
rotation while VERAX fans produce 18) in a 9-bit register. This register is
read out every second, then the ripple prescaler (2, 4 or 8) is applied and
the result is stored in the 8 bit output register. Due to the limitation of
the counting register to 9 bits, it is impossible to measure a VERAX fan
properly (even with a prescaler of 8). At its maximum speed of 3500 RPM the
fan produces 1080 ripples per second which causes the counting register to
overflow twice, leading to only 186 RPM.
* Measuring input voltages
in2 ("battery") reports the voltage of the onboard lithium battery and not
+3.3V from the power supply.
* Undocumented features
Fujitsu-Siemens Computers has not documented all features of the chip so
far. Their software, System Guard, shows that there are a still some
features which cannot be controlled by this implementation.
Documentation/hwmon/gl518sm
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Kernel driver gl518sm
=====================
Supported chips:
* Genesys Logic GL518SM release 0x00
Prefix: 'gl518sm'
Addresses scanned: I2C 0x2c and 0x2d
Datasheet: http://www.genesyslogic.com/pdf
* Genesys Logic GL518SM release 0x80
Prefix: 'gl518sm'
Addresses scanned: I2C 0x2c and 0x2d
Datasheet: http://www.genesyslogic.com/pdf
Authors:
Frodo Looijaard <frodol@dds.nl>,
Kyösti Mälkki <kmalkki@cc.hut.fi>
Hong-Gunn Chew <hglinux@gunnet.org>
Jean Delvare <khali@linux-fr.org>
Description
-----------
IMPORTANT:
For the revision 0x00 chip, the in0, in1, and in2 values (+5V, +3V,
and +12V) CANNOT be read. This is a limitation of the chip, not the driver.
This driver supports the Genesys Logic GL518SM chip. There are at least
two revision of this chip, which we call revision 0x00 and 0x80. Revision
0x80 chips support the reading of all voltages and revision 0x00 only
for VIN3.
The GL518SM implements one temperature sensor, two fan rotation speed
sensors, and four voltage sensors. It can report alarms through the
computer speakers.
Temperatures are measured in degrees Celsius. An alarm goes off while the
temperature is above the over temperature limit, and has not yet dropped
below the hysteresis limit. The alarm always reflects the current
situation. Measurements are guaranteed between -10 degrees and +110
degrees, with a accuracy of +/-3 degrees.
Rotation speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit. In
case when you have selected to turn fan1 off, no fan1 alarm is triggered.
Fan readings can be divided by a programmable divider (1, 2, 4 or 8) to
give the readings more range or accuracy. Not all RPM values can
accurately be represented, so some rounding is done. With a divider
of 2, the lowest representable value is around 1900 RPM.
Voltage sensors (also known as VIN sensors) report their values in volts.
An alarm is triggered if the voltage has crossed a programmable minimum or
maximum limit. Note that minimum in this case always means 'closest to
zero'; this is important for negative voltage measurements. The VDD input
measures voltages between 0.000 and 5.865 volt, with a resolution of 0.023
volt. The other inputs measure voltages between 0.000 and 4.845 volt, with
a resolution of 0.019 volt. Note that revision 0x00 chips do not support
reading the current voltage of any input except for VIN3; limit setting and
alarms work fine, though.
When an alarm is triggered, you can be warned by a beeping signal through your
computer speaker. It is possible to enable all beeping globally, or only the
beeping for some alarms.
If an alarm triggers, it will remain triggered until the hardware register
is read at least once (except for temperature alarms). This means that the
cause for the alarm may already have disappeared! Note that in the current
implementation, all hardware registers are read whenever any data is read
(unless it is less than 1.5 seconds since the last update). This means that
you can easily miss once-only alarms.
The GL518SM only updates its values each 1.5 seconds; reading it more often
will do no harm, but will return 'old' values.
Documentation/hwmon/it87
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Kernel driver it87
==================
Supported chips:
* IT8705F
Prefix: 'it87'
Addresses scanned: from Super I/O config space, or default ISA 0x290 (8 I/O ports)
Datasheet: Publicly available at the ITE website
http://www.ite.com.tw/
* IT8712F
Prefix: 'it8712'
Addresses scanned: I2C 0x28 - 0x2f
from Super I/O config space, or default ISA 0x290 (8 I/O ports)
Datasheet: Publicly available at the ITE website
http://www.ite.com.tw/
* SiS950 [clone of IT8705F]
Prefix: 'sis950'
Addresses scanned: from Super I/O config space, or default ISA 0x290 (8 I/O ports)
Datasheet: No longer be available
Author: Christophe Gauthron <chrisg@0-in.com>
Module Parameters
-----------------
* update_vbat: int
0 if vbat should report power on value, 1 if vbat should be updated after
each read. Default is 0. On some boards the battery voltage is provided
by either the battery or the onboard power supply. Only the first reading
at power on will be the actual battery voltage (which the chip does
automatically). On other boards the battery voltage is always fed to
the chip so can be read at any time. Excessive reading may decrease
battery life but no information is given in the datasheet.
* fix_pwm_polarity int
Force PWM polarity to active high (DANGEROUS). Some chips are
misconfigured by BIOS - PWM values would be inverted. This option tries
to fix this. Please contact your BIOS manufacturer and ask him for fix.
Description
-----------
This driver implements support for the IT8705F, IT8712F and SiS950 chips.
This driver also supports IT8712F, which adds SMBus access, and a VID
input, used to report the Vcore voltage of the Pentium processor.
The IT8712F additionally features VID inputs.
These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
joysticks and other miscellaneous stuff. For hardware monitoring, they
include an 'environment controller' with 3 temperature sensors, 3 fan
rotation speed sensors, 8 voltage sensors, and associated alarms.
Temperatures are measured in degrees Celsius. An alarm is triggered once
when the Overtemperature Shutdown limit is crossed.
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit. Fan
readings can be divided by a programmable divider (1, 2, 4 or 8) to give the
readings more range or accuracy. Not all RPM values can accurately be
represented, so some rounding is done. With a divider of 2, the lowest
representable value is around 2600 RPM.
Voltage sensors (also known as IN sensors) report their values in volts. An
alarm is triggered if the voltage has crossed a programmable minimum or
maximum limit. Note that minimum in this case always means 'closest to
zero'; this is important for negative voltage measurements. All voltage
inputs can measure voltages between 0 and 4.08 volts, with a resolution of
0.016 volt. The battery voltage in8 does not have limit registers.
The VID lines (IT8712F only) encode the core voltage value: the voltage
level your processor should work with. This is hardcoded by the mainboard
and/or processor itself. It is a value in volts.
If an alarm triggers, it will remain triggered until the hardware register
is read at least once. This means that the cause for the alarm may already
have disappeared! Note that in the current implementation, all hardware
registers are read whenever any data is read (unless it is less than 1.5
seconds since the last update). This means that you can easily miss
once-only alarms.
The IT87xx only updates its values each 1.5 seconds; reading it more often
will do no harm, but will return 'old' values.
To change sensor N to a thermistor, 'echo 2 > tempN_type' where N is 1, 2,
or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
Give 0 for unused sensor. Any other value is invalid. To configure this at
startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor;
3 = thermal diode)
The fan speed control features are limited to manual PWM mode. Automatic
"Smart Guardian" mode control handling is not implemented. However
if you want to go for "manual mode" just write 1 to pwmN_enable.
Documentation/hwmon/lm63
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Kernel driver lm63
==================
Supported chips:
* National Semiconductor LM63
Prefix: 'lm63'
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/pf/LM/LM63.html
Author: Jean Delvare <khali@linux-fr.org>
Thanks go to Tyan and especially Alex Buckingham for setting up a remote
access to their S4882 test platform for this driver.
http://www.tyan.com/
Description
-----------
The LM63 is a digital temperature sensor with integrated fan monitoring
and control.
The LM63 is basically an LM86 with fan speed monitoring and control
capabilities added. It misses some of the LM86 features though:
- No low limit for local temperature.
- No critical limit for local temperature.
- Critical limit for remote temperature can be changed only once. We
will consider that the critical limit is read-only.
The datasheet isn't very clear about what the tachometer reading is.
An explanation from National Semiconductor: The two lower bits of the read
value have to be masked out. The value is still 16 bit in width.
All temperature values are given in degrees Celsius. Resolution is 1.0
degree for the local temperature, 0.125 degree for the remote temperature.
The fan speed is measured using a tachometer. Contrary to most chips which
store the value in an 8-bit register and have a selectable clock divider
to make sure that the result will fit in the register, the LM63 uses 16-bit
value for measuring the speed of the fan. It can measure fan speeds down to
83 RPM, at least in theory.
Note that the pin used for fan monitoring is shared with an alert out
function. Depending on how the board designer wanted to use the chip, fan
speed monitoring will or will not be possible. The proper chip configuration
is left to the BIOS, and the driver will blindly trust it.
A PWM output can be used to control the speed of the fan. The LM63 has two
PWM modes: manual and automatic. Automatic mode is not fully implemented yet
(you cannot define your custom PWM/temperature curve), and mode change isn't
supported either.
The lm63 driver will not update its values more frequently than every
second; reading them more often will do no harm, but will return 'old'
values.
Documentation/hwmon/lm75
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Kernel driver lm75
==================
Supported chips:
* National Semiconductor LM75
Prefix: 'lm75'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
* Dallas Semiconductor DS75
Prefix: 'lm75'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the Dallas Semiconductor website
http://www.maxim-ic.com/
* Dallas Semiconductor DS1775
Prefix: 'lm75'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the Dallas Semiconductor website
http://www.maxim-ic.com/
* Maxim MAX6625, MAX6626
Prefix: 'lm75'
Addresses scanned: I2C 0x48 - 0x4b
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/
* Microchip (TelCom) TCN75
Prefix: 'lm75'
Addresses scanned: I2C 0x48 - 0x4f
Datasheet: Publicly available at the Microchip website
http://www.microchip.com/
Author: Frodo Looijaard <frodol@dds.nl>
Description
-----------
The LM75 implements one temperature sensor. Limits can be set through the
Overtemperature Shutdown register and Hysteresis register. Each value can be
set and read to half-degree accuracy.
An alarm is issued (usually to a connected LM78) when the temperature
gets higher then the Overtemperature Shutdown value; it stays on until
the temperature falls below the Hysteresis value.
All temperatures are in degrees Celsius, and are guaranteed within a
range of -55 to +125 degrees.
The LM75 only updates its values each 1.5 seconds; reading it more often
will do no harm, but will return 'old' values.
The LM75 is usually used in combination with LM78-like chips, to measure
the temperature of the processor(s).
The DS75, DS1775, MAX6625, and MAX6626 are supported as well.
They are not distinguished from an LM75. While most of these chips
have three additional bits of accuracy (12 vs. 9 for the LM75),
the additional bits are not supported. Not only that, but these chips will
not be detected if not in 9-bit precision mode (use the force parameter if
needed).
The TCN75 is supported as well, and is not distinguished from an LM75.
The LM75 is essentially an industry standard; there may be other
LM75 clones not listed here, with or without various enhancements,
that are supported.
The LM77 is not supported, contrary to what we pretended for a long time.
Both chips are simply not compatible, value encoding differs.
Documentation/hwmon/lm77
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Kernel driver lm77
==================
Supported chips:
* National Semiconductor LM77
Prefix: 'lm77'
Addresses scanned: I2C 0x48 - 0x4b
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
Author: Andras BALI <drewie@freemail.hu>
Description
-----------
The LM77 implements one temperature sensor. The temperature
sensor incorporates a band-gap type temperature sensor,
10-bit ADC, and a digital comparator with user-programmable upper
and lower limit values.
Limits can be set through the Overtemperature Shutdown register and
Hysteresis register.
Documentation/hwmon/lm78
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Kernel driver lm78
==================
Supported chips:
* National Semiconductor LM78
Prefix: 'lm78'
Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
* National Semiconductor LM78-J
Prefix: 'lm78-j'
Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
* National Semiconductor LM79
Prefix: 'lm79'
Addresses scanned: I2C 0x20 - 0x2f, ISA 0x290 (8 I/O ports)
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
Author: Frodo Looijaard <frodol@dds.nl>
Description
-----------
This driver implements support for the National Semiconductor LM78, LM78-J
and LM79. They are described as 'Microprocessor System Hardware Monitors'.
There is almost no difference between the three supported chips. Functionally,
the LM78 and LM78-J are exactly identical. The LM79 has one more VID line,
which is used to report the lower voltages newer Pentium processors use.
From here on, LM7* means either of these three types.
The LM7* implements one temperature sensor, three fan rotation speed sensors,
seven voltage sensors, VID lines, alarms, and some miscellaneous stuff.
Temperatures are measured in degrees Celsius. An alarm is triggered once
when the Overtemperature Shutdown limit is crossed; it is triggered again
as soon as it drops below the Hysteresis value. A more useful behavior
can be found by setting the Hysteresis value to +127 degrees Celsius; in
this case, alarms are issued during all the time when the actual temperature
is above the Overtemperature Shutdown value. Measurements are guaranteed
between -55 and +125 degrees, with a resolution of 1 degree.
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit. Fan
readings can be divided by a programmable divider (1, 2, 4 or 8) to give
the readings more range or accuracy. Not all RPM values can accurately be
represented, so some rounding is done. With a divider of 2, the lowest
representable value is around 2600 RPM.
Voltage sensors (also known as IN sensors) report their values in volts.
An alarm is triggered if the voltage has crossed a programmable minimum
or maximum limit. Note that minimum in this case always means 'closest to
zero'; this is important for negative voltage measurements. All voltage
inputs can measure voltages between 0 and 4.08 volts, with a resolution
of 0.016 volt.
The VID lines encode the core voltage value: the voltage level your processor
should work with. This is hardcoded by the mainboard and/or processor itself.
It is a value in volts. When it is unconnected, you will often find the
value 3.50 V here.
In addition to the alarms described above, there are a couple of additional
ones. There is a BTI alarm, which gets triggered when an external chip has
crossed its limits. Usually, this is connected to all LM75 chips; if at
least one crosses its limits, this bit gets set. The CHAS alarm triggers
if your computer case is open. The FIFO alarms should never trigger; it
indicates an internal error. The SMI_IN alarm indicates some other chip
has triggered an SMI interrupt. As we do not use SMI interrupts at all,
this condition usually indicates there is a problem with some other
device.
If an alarm triggers, it will remain triggered until the hardware register
is read at least once. This means that the cause for the alarm may
already have disappeared! Note that in the current implementation, all
hardware registers are read whenever any data is read (unless it is less
than 1.5 seconds since the last update). This means that you can easily
miss once-only alarms.
The LM7* only updates its values each 1.5 seconds; reading it more often
will do no harm, but will return 'old' values.
Documentation/hwmon/lm80
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Kernel driver lm80
==================
Supported chips:
* National Semiconductor LM80
Prefix: 'lm80'
Addresses scanned: I2C 0x28 - 0x2f
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/
Authors:
Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>
Description
-----------
This driver implements support for the National Semiconductor LM80.
It is described as a 'Serial Interface ACPI-Compatible Microprocessor
System Hardware Monitor'.
The LM80 implements one temperature sensor, two fan rotation speed sensors,
seven voltage sensors, alarms, and some miscellaneous stuff.
Temperatures are measured in degrees Celsius. There are two sets of limits
which operate independently. When the HOT Temperature Limit is crossed,
this will cause an alarm that will be reasserted until the temperature
drops below the HOT Hysteresis. The Overtemperature Shutdown (OS) limits
should work in the same way (but this must be checked; the datasheet
is unclear about this). Measurements are guaranteed between -55 and
+125 degrees. The current temperature measurement has a resolution of
0.0625 degrees; the limits have a resolution of 1 degree.
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit. Fan
readings can be divided by a programmable divider (1, 2, 4 or 8) to give
the readings more range or accuracy. Not all RPM values can accurately be
represented, so some rounding is done. With a divider of 2, the lowest
representable value is around 2600 RPM.
Voltage sensors (also known as IN sensors) report their values in volts.
An alarm is triggered if the voltage has crossed a programmable minimum
or maximum limit. Note that minimum in this case always means 'closest to
zero'; this is important for negative voltage measurements. All voltage
inputs can measure voltages between 0 and 2.55 volts, with a resolution
of 0.01 volt.
If an alarm triggers, it will remain triggered until the hardware register
is read at least once. This means that the cause for the alarm may
already have disappeared! Note that in the current implementation, all
hardware registers are read whenever any data is read (unless it is less
than 2.0 seconds since the last update). This means that you can easily
miss once-only alarms.
The LM80 only updates its values each 1.5 seconds; reading it more often
will do no harm, but will return 'old' values.
Documentation/hwmon/lm83
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Kernel driver lm83
==================
Supported chips:
* National Semiconductor LM83
Prefix: 'lm83'
Addresses scanned: I2C 0x18 - 0x1a, 0x29 - 0x2b, 0x4c - 0x4e
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/pf/LM/LM83.html
Author: Jean Delvare <khali@linux-fr.org>
Description
-----------
The LM83 is a digital temperature sensor. It senses its own temperature as
well as the temperature of up to three external diodes. It is compatible
with many other devices such as the LM84 and all other ADM1021 clones.
The main difference between the LM83 and the LM84 in that the later can
only sense the temperature of one external diode.
Using the adm1021 driver for a LM83 should work, but only two temperatures
will be reported instead of four.
The LM83 is only found on a handful of motherboards. Both a confirmed
list and an unconfirmed list follow. If you can confirm or infirm the
fact that any of these motherboards do actually have an LM83, please
contact us. Note that the LM90 can easily be misdetected as a LM83.
Confirmed motherboards:
SBS P014
Unconfirmed motherboards:
Gigabyte GA-8IK1100
Iwill MPX2
Soltek SL-75DRV5
The driver has been successfully tested by Magnus Forsström, who I'd
like to thank here. More testers will be of course welcome.
The fact that the LM83 is only scarcely used can be easily explained.
Most motherboards come with more than just temperature sensors for
health monitoring. They also have voltage and fan rotation speed
sensors. This means that temperature-only chips are usually used as
secondary chips coupled with another chip such as an IT8705F or similar
chip, which provides more features. Since systems usually need three
temperature sensors (motherboard, processor, power supply) and primary
chips provide some temperature sensors, the secondary chip, if needed,
won't have to handle more than two temperatures. Thus, ADM1021 clones
are sufficient, and there is no need for a four temperatures sensor
chip such as the LM83. The only case where using an LM83 would make
sense is on SMP systems, such as the above-mentioned Iwill MPX2,
because you want an additional temperature sensor for each additional
CPU.
On the SBS P014, this is different, since the LM83 is the only hardware
monitoring chipset. One temperature sensor is used for the motherboard
(actually measuring the LM83's own temperature), one is used for the
CPU. The two other sensors must be used to measure the temperature of
two other points of the motherboard. We suspect these points to be the
north and south bridges, but this couldn't be confirmed.
All temperature values are given in degrees Celsius. Local temperature
is given within a range of 0 to +85 degrees. Remote temperatures are
given within a range of 0 to +125 degrees. Resolution is 1.0 degree,
accuracy is guaranteed to 3.0 degrees (see the datasheet for more
details).
Each sensor has its own high limit, but the critical limit is common to
all four sensors. There is no hysteresis mechanism as found on most
recent temperature sensors.
The lm83 driver will not update its values more frequently than every
other second; reading them more often will do no harm, but will return
'old' values.
Documentation/hwmon/lm85
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Kernel driver lm85
==================
Supported chips:
* National Semiconductor LM85 (B and C versions)
Prefix: 'lm85'
Addresses scanned: I2C 0x2c, 0x2d, 0x2e
Datasheet: http://www.national.com/pf/LM/LM85.html
* Analog Devices ADM1027
Prefix: 'adm1027'
Addresses scanned: I2C 0x2c, 0x2d, 0x2e
Datasheet: http://www.analog.com/en/prod/0,,766_825_ADM1027,00.html
* Analog Devices ADT7463
Prefix: 'adt7463'
Addresses scanned: I2C 0x2c, 0x2d, 0x2e
Datasheet: http://www.analog.com/en/prod/0,,766_825_ADT7463,00.html
* SMSC EMC6D100, SMSC EMC6D101
Prefix: 'emc6d100'
Addresses scanned: I2C 0x2c, 0x2d, 0x2e
Datasheet: http://www.smsc.com/main/tools/discontinued/6d100.pdf
* SMSC EMC6D102
Prefix: 'emc6d102'
Addresses scanned: I2C 0x2c, 0x2d, 0x2e
Datasheet: http://www.smsc.com/main/catalog/emc6d102.html
Authors:
Philip Pokorny <ppokorny@penguincomputing.com>,
Frodo Looijaard <frodol@dds.nl>,
Richard Barrington <rich_b_nz@clear.net.nz>,
Margit Schubert-While <margitsw@t-online.de>,
Justin Thiessen <jthiessen@penguincomputing.com>
Description
-----------
This driver implements support for the National Semiconductor LM85 and
compatible chips including the Analog Devices ADM1027, ADT7463 and
SMSC EMC6D10x chips 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 five (5) voltages. It has four (4) 16-bit counters for
measuring fan speed. Five (5) digital inputs are provided for sampling the
VID signals from the processor to the VRM. Lastly, there are three (3) PWM
outputs that can be used to control fan speed.
The voltage inputs have internal scaling resistors so that the following
voltage can be measured without external resistors:
2.5V, 3.3V, 5V, 12V, and CPU core voltage (2.25V)
The temperatures measured are one internal diode, and two remote diodes.
Remote 1 is generally the CPU temperature. These inputs are designed to
measure a thermal diode like the one in a Pentium 4 processor in a socket
423 or socket 478 package. They can also measure temperature using a
transistor like the 2N3904.
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 LM85 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 LM85 will signal an ALARM if any
measured value exceeds either limit.
The LM85 samples all inputs continuously. The lm85 driver will not read
the registers more often than once a second. Further, configuration data is
only read once each 5 minutes. There is twice as much config data as
measurements, so this would seem to be a worthwhile optimization.
Special Features
----------------
The LM85 has four fan speed monitoring modes. The ADM1027 has only two.
Both have special circuitry to compensate for PWM interactions with the
TACH signal from the fans. The ADM1027 can be configured to measure the
speed of a two wire fan, but the input conditioning circuitry is different
for 3-wire and 2-wire mode. For this reason, the 2-wire fan modes are not
exposed to user control. The BIOS should initialize them to the correct
mode. If you've designed your own ADM1027, you'll have to modify the
init_client function and add an insmod parameter to set this up.
To smooth the response of fans to changes in temperature, the LM85 has an
optional filter for smoothing temperatures. The ADM1027 has the same
config option but uses it to rate limit the changes to fan speed instead.
The ADM1027 and ADT7463 have a 10-bit ADC and can therefore measure
temperatures with 0.25 degC resolution. They also provide an offset to the
temperature readings that is automatically applied during measurement.
This offset can be used to zero out any errors due to traces and placement.
The documentation says that the offset is in 0.25 degC steps, but in
initial testing of the ADM1027 it was 1.00 degC steps. Analog Devices has
confirmed this "bug". The ADT7463 is reported to work as described in the
documentation. The current lm85 driver does not show the offset register.
The ADT7463 has a THERM asserted counter. This counter has a 22.76ms
resolution and a range of 5.8 seconds. The driver implements a 32-bit
accumulator of the counter value to extend the range to over a year. The
counter will stay at it's max value until read.
See the vendor datasheets for more information. There is application note
from National (AN-1260) with some additional information about the LM85.
The Analog Devices datasheet is very detailed and describes a procedure for
determining an optimal configuration for the automatic PWM control.
The SMSC EMC6D100 & EMC6D101 monitor external voltages, temperatures, and
fan speeds. They use this monitoring capability to alert the system to out
of limit conditions and can automatically control the speeds of multiple
fans in a PC or embedded system. The EMC6D101, available in a 24-pin SSOP
package, and the EMC6D100, available in a 28-pin SSOP package, are designed
to be register compatible. The EMC6D100 offers all the features of the
EMC6D101 plus additional voltage monitoring and system control features.
Unfortunately it is not possible to distinguish between the package
versions on register level so these additional voltage inputs may read
zero. The EMC6D102 features addtional ADC bits thus extending precision
of voltage and temperature channels.
Hardware Configurations
-----------------------
The LM85 can be jumpered for 3 different SMBus addresses. There are
no other hardware configuration options for the LM85.
The lm85 driver detects both LM85B and LM85C revisions of the chip. See the
datasheet for a complete description of the differences. Other than
identifying the chip, the driver behaves no differently with regard to
these two chips. The LM85B is recommended for new designs.
The ADM1027 and ADT7463 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 one of the other
functions (PWM2 or IN0). This functionality is not implemented in current
driver.
The ADT7463 also has an optional THERM output/input which can be connected
to the processor PROC_HOT output. If available, the autofan control
dynamic Tmin feature can be enabled to keep the system temperature within
spec (just?!) with the least possible fan noise.
Configuration Notes
-------------------
Besides standard interfaces driver adds following:
* Temperatures and Zones
Each temperature sensor is associated with a Zone. There are three
sensors and therefore three zones (# 1, 2 and 3). Each zone has the following
temperature configuration points:
* temp#_auto_temp_off - temperature below which fans should be off or spinning very low.
* temp#_auto_temp_min - temperature over which fans start to spin.
* temp#_auto_temp_max - temperature when fans spin at full speed.
* temp#_auto_temp_crit - temperature when all fans will run full speed.
* PWM Control
There are three PWM outputs. The LM85 datasheet suggests that the
pwm3 output control both fan3 and fan4. Each PWM can be individually
configured and assigned to a zone for it's control value. Each PWM can be
configured individually according to the following options.
* pwm#_auto_pwm_min - this specifies the PWM value for temp#_auto_temp_off
temperature. (PWM value from 0 to 255)
* pwm#_auto_pwm_freq - select base frequency of PWM output. You can select
in range of 10.0 to 94.0 Hz in .1 Hz units.
(Values 100 to 940).
The pwm#_auto_pwm_freq can be set to one of the following 8 values. Setting the
frequency to a value not on this list, will result in the next higher frequency
being selected. The actual device frequency may vary slightly from this
specification as designed by the manufacturer. Consult the datasheet for more
details. (PWM Frequency values: 100, 150, 230, 300, 380, 470, 620, 940)
* pwm#_auto_pwm_minctl - this flags selects for temp#_auto_temp_off temperature
the bahaviour of fans. Write 1 to let fans spinning at
pwm#_auto_pwm_min or write 0 to let them off.
NOTE: It has been reported that there is a bug in the LM85 that causes the flag
to be associated with the zones not the PWMs. This contradicts all the
published documentation. Setting pwm#_min_ctl in this case actually affects all
PWMs controlled by zone '#'.
* PWM Controlling Zone selection
* pwm#_auto_channels - controls zone that is associated with PWM
Configuration choices:
Value Meaning
------ ------------------------------------------------
1 Controlled by Zone 1
2 Controlled by Zone 2
3 Controlled by Zone 3
23 Controlled by higher temp of Zone 2 or 3
123 Controlled by highest temp of Zone 1, 2 or 3
0 PWM always 0% (off)
-1 PWM always 100% (full on)
-2 Manual control (write to 'pwm#' to set)
The National LM85's have two vendor specific configuration
features. Tach. mode and Spinup Control. For more details on these,
see the LM85 datasheet or Application Note AN-1260.
The Analog Devices ADM1027 has several vendor specific enhancements.
The number of pulses-per-rev of the fans can be set, Tach monitoring
can be optimized for PWM operation, and an offset can be applied to
the temperatures to compensate for systemic errors in the
measurements.
In addition to the ADM1027 features, the ADT7463 also has Tmin control
and THERM asserted counts. Automatic Tmin control acts to adjust the
Tmin value to maintain the measured temperature sensor at a specified
temperature. There isn't much documentation on this feature in the
ADT7463 data sheet. This is not supported by current driver.
Documentation/hwmon/lm87
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Kernel driver lm87
==================
Supported chips:
* National Semiconductor LM87
Prefix: 'lm87'
Addresses scanned: I2C 0x2c - 0x2f
Datasheet: http://www.national.com/pf/LM/LM87.html
Authors:
Frodo Looijaard <frodol@dds.nl>,
Philip Edelbrock <phil@netroedge.com>,
Mark Studebaker <mdsxyz123@yahoo.com>,
Stephen Rousset <stephen.rousset@rocketlogix.com>,
Dan Eaton <dan.eaton@rocketlogix.com>,
Jean Delvare <khali@linux-fr.org>,
Original 2.6 port Jeff Oliver
Description
-----------
This driver implements support for the National Semiconductor LM87.
The LM87 implements up to three temperature sensors, up to two fan
rotation speed sensors, up to seven voltage sensors, alarms, and some
miscellaneous stuff.
Temperatures are measured in degrees Celsius. Each input has a high
and low alarm settings. A high limit produces an alarm when the value
goes above it, and an alarm is also produced when the value goes below
the low limit.
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit. Fan
readings can be divided by a programmable divider (1, 2, 4 or 8) to give
the readings more range or accuracy. Not all RPM values can accurately be
represented, so some rounding is done. With a divider of 2, the lowest
representable value is around 2600 RPM.
Voltage sensors (also known as IN sensors) report their values in
volts. An alarm is triggered if the voltage has crossed a programmable
minimum or maximum limit. Note that minimum in this case always means
'closest to zero'; this is important for negative voltage measurements.
If an alarm triggers, it will remain triggered until the hardware register
is read at least once. This means that the cause for the alarm may
already have disappeared! Note that in the current implementation, all
hardware registers are read whenever any data is read (unless it is less
than 1.0 seconds since the last update). This means that you can easily
miss once-only alarms.
The lm87 driver only updates its values each 1.0 seconds; reading it more
often will do no harm, but will return 'old' values.
Hardware Configurations
-----------------------
The LM87 has four pins which can serve one of two possible functions,
depending on the hardware configuration.
Some functions share pins, so not all functions are available at the same
time. Which are depends on the hardware setup. This driver assumes that
the BIOS configured the chip correctly. In that respect, it differs from
the original driver (from lm_sensors for Linux 2.4), which would force the
LM87 to an arbitrary, compile-time chosen mode, regardless of the actual
chipset wiring.
For reference, here is the list of exclusive functions:
- in0+in5 (default) or temp3
- fan1 (default) or in6
- fan2 (default) or in7
- VID lines (default) or IRQ lines (not handled by this driver)
Documentation/hwmon/lm90
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Kernel driver lm90
==================
Supported chips:
* National Semiconductor LM90
Prefix: 'lm90'
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/pf/LM/LM90.html
* National Semiconductor LM89
Prefix: 'lm99'
Addresses scanned: I2C 0x4c and 0x4d
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/pf/LM/LM89.html
* National Semiconductor LM99
Prefix: 'lm99'
Addresses scanned: I2C 0x4c and 0x4d
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/pf/LM/LM99.html
* National Semiconductor LM86
Prefix: 'lm86'
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the National Semiconductor website
http://www.national.com/pf/LM/LM86.html
* Analog Devices ADM1032
Prefix: 'adm1032'
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the Analog Devices website
http://products.analog.com/products/info.asp?product=ADM1032
* Analog Devices ADT7461
Prefix: 'adt7461'
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the Analog Devices website
http://products.analog.com/products/info.asp?product=ADT7461
Note: Only if in ADM1032 compatibility mode
* Maxim MAX6657
Prefix: 'max6657'
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
* Maxim MAX6658
Prefix: 'max6657'
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
* Maxim MAX6659
Prefix: 'max6657'
Addresses scanned: I2C 0x4c, 0x4d (unsupported 0x4e)
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
Author: Jean Delvare <khali@linux-fr.org>
Description
-----------
The LM90 is a digital temperature sensor. It senses its own temperature as
well as the temperature of up to one external diode. It is compatible
with many other devices such as the LM86, the LM89, the LM99, the ADM1032,
the MAX6657, MAX6658 and the MAX6659 all of which are supported by this driver.
Note that there is no easy way to differentiate between the last three
variants. The extra address and features of the MAX6659 are not supported by
this driver. Additionally, the ADT7461 is supported if found in ADM1032
compatibility mode.
The specificity of this family of chipsets over the ADM1021/LM84
family is that it features critical limits with hysteresis, and an
increased resolution of the remote temperature measurement.
The different chipsets of the family are not strictly identical, although
very similar. This driver doesn't handle any specific feature for now,
but could if there ever was a need for it. For reference, here comes a
non-exhaustive list of specific features:
LM90:
* Filter and alert configuration register at 0xBF.
* ALERT is triggered by temperatures over critical limits.
LM86 and LM89:
* Same as LM90
* Better external channel accuracy
LM99:
* Same as LM89
* External temperature shifted by 16 degrees down
ADM1032:
* Consecutive alert register at 0x22.
* Conversion averaging.
* Up to 64 conversions/s.
* ALERT is triggered by open remote sensor.
ADT7461
* Extended temperature range (breaks compatibility)
* Lower resolution for remote temperature
MAX6657 and MAX6658:
* Remote sensor type selection
MAX6659
* Selectable address
* Second critical temperature limit
* Remote sensor type selection
All temperature values are given in degrees Celsius. Resolution
is 1.0 degree for the local temperature, 0.125 degree for the remote
temperature.
Each sensor has its own high and low limits, plus a critical limit.
Additionally, there is a relative hysteresis value common to both critical
values. To make life easier to user-space applications, two absolute values
are exported, one for each channel, but these values are of course linked.
Only the local hysteresis can be set from user-space, and the same delta
applies to the remote hysteresis.
The lm90 driver will not update its values more frequently than every
other second; reading them more often will do no harm, but will return
'old' values.
Documentation/hwmon/lm92
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Kernel driver lm92
==================
Supported chips:
* National Semiconductor LM92
Prefix: 'lm92'
Addresses scanned: I2C 0x48 - 0x4b
Datasheet: http://www.national.com/pf/LM/LM92.html
* National Semiconductor LM76
Prefix: 'lm92'
Addresses scanned: none, force parameter needed
Datasheet: http://www.national.com/pf/LM/LM76.html
* Maxim MAX6633/MAX6634/MAX6635
Prefix: 'lm92'
Addresses scanned: I2C 0x48 - 0x4b
MAX6633 with address in 0x40 - 0x47, 0x4c - 0x4f needs force parameter
and MAX6634 with address in 0x4c - 0x4f needs force parameter
Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
Authors:
Abraham van der Merwe <abraham@2d3d.co.za>
Jean Delvare <khali@linux-fr.org>
Description
-----------
This driver implements support for the National Semiconductor LM92
temperature sensor.
Each LM92 temperature sensor supports a single temperature sensor. There are
alarms for high, low, and critical thresholds. There's also an hysteresis to
control the thresholds for resetting alarms.
Support was added later for the LM76 and Maxim MAX6633/MAX6634/MAX6635,
which are mostly compatible. They have not all been tested, so you
may need to use the force parameter.

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