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lm-sensors/doc/chips/it87
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Mark D. Studebaker 41eebf36d6 correct temp_type table (tkt 798) 
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1294 7894878c-1315-0410-8ee3-d5d059ff63e0
2002-01-25 01:22:36 +00:00

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Kernel driver `it87.o'
======================
Status: Beta
Supported chips:
* IT8705F
ISA 0x290
Datasheet: Publicly available at the ITE website
http://www.ite.com.tw
* IT8712F (untested)
Addresses scanned: I2C 0x20 - 0x2f (inclusive), ISA 0x290 (8 I/O ports)
Datasheet: Publicly available at the ITE website
http://www.ite.com.tw
* Sis950 [clone of IT8705F]
ISA 0x290
Datasheet: Publicly available at the SIS website
Appears to no longer be available on SIS website, found at
http://ic.doma.kiev.ua/pdf/chip/sio.htm
Author: Christophe Gauthron <chrisg@0-in.com>
Module Parameters
-----------------
* force: short array (min = 1, max = 48)
List of adapter,address pairs to boldly assume to be present
* ignore: short array (min = 1, max = 48)
List of adapter,address pairs not to scan
* ignore_range: short array (min = 1, max = 48)
List of adapter,start-addr,end-addr triples not to scan
* probe: short array (min = 1, max = 48)
List of adapter,address pairs to scan additionally
* probe_range: short array (min = 1, max = 48)
List of adapter,start-addr,end-addr triples to scan additionally
* update_vbat: integer 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.
* temp_type: integer bit mask
bit 0: Temp sensor 1 is thermal diode
bit 1: Temp sensor 2 is thermal diode
bit 2: Temp sensor 3 is thermal diode
bit 3: Temp sensor 1 is thermal resistor
bit 4: Temp sensor 2 is thermal resistor
bit 5: Temp sensor 3 is thermal resistor
For each sensor either the diode or resistor bit should be set, not both.
Default is temp sensor 1 and 3 resistor, 2 diode (value 0x2a)
Legal values:
sensor1 sensor2 sensor3 value
------- ------- ------- -----
diode diode diode 0x07
diode diode thermistor 0x23
diode thermistor diode 0x15
diode thermistor thermistor 0x31
thermistor diode diode 0x0e
thermistor diode thermistor 0x2a ** default
thermistor thermistor diode 0x1c
thermistor thermistor thermistor 0x38
Description
-----------
This driver implements support for the IT8705F chip.
This chip is also known as SIS 950.
This driver also supports IT8712F, which adds SmBus access, and a Vid
input, used to report the Vcore voltage of the Pentium processor.
These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
joysticks and other miscellaneous stuff. For hardware monitoring,
they include an 'environmnent controller' with 3 temperature sensors,
3 FAN rotation speed sensors, 8 voltage sensors, and associated alarms.
Temperatures are measured in degrees Celcius. 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.
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. This is important because some FANs
report only one 'tick' each rotation, while others report two - making
all readings twice as high. 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.
Chip features
-------------
Chip `it87`
LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
in0 NONE NONE R 2
in1 NONE NONE R 2
in2 NONE NONE R 2
in3 NONE NONE R 2
in4 NONE NONE R 2
in5 NONE NONE R 2
in6 NONE NONE R 2
in7 NONE NONE R 2
in8 NONE NONE R 2
in0_min in0 in0 RW 2
in1_min in1 in1 RW 2
in2_min in2 in2 RW 2
in3_min in3 in3 RW 2
in4_min in4 in4 RW 2
in5_min in5 in5 RW 2
in6_min in6 in6 RW 2
in7_min in6 in6 RW 2
in0_max in0 in0 RW 2
in1_max in1 in1 RW 2
in2_max in2 in2 RW 2
in3_max in3 in3 RW 2
in4_max in4 in4 RW 2
in5_max in5 in5 RW 2
in6_max in6 in6 RW 2
in7_max in6 in6 RW 2
fan1 NONE NONE R 0
fan2 NONE NONE R 0
fan3 NONE NONE R 0
fan1_min fan1 fan1 RW 0
fan2_min fan2 fan2 RW 0
fan3_min fan3 fan3 RW 0
temp1 NONE NONE R 1
temp2 NONE NONE R 1
temp3 NONE NONE R 1
temp_hyst1 temp temp RW 1
temp_over1 temp temp RW 1
temp_hyst2 temp temp RW 1
temp_over2 temp temp RW 1
temp_hyst3 temp temp RW 1
temp_over3 temp temp RW 1
vid NONE NONE R 2
fan1_div fan1 NONE RW 0
fan2_div fan2 NONE RW 0
fan3_div fan3 NONE R 0
alarms_vin NONE NONE R 0
alarms_fan NONE NONE R 0
alarms_temp NONE NONE R 0
LABEL FEATURE SYMBOL SYSCTL FILE:OFFSET
in0 SENSORS_IT87_IN0 in0:3
in1 SENSORS_IT87_IN1 in1:3
in2 SENSORS_IT87_IN2 in2:3
in3 SENSORS_IT87_IN3 in3:3
in4 SENSORS_IT87_IN4 in4:3
in5 SENSORS_IT87_IN5 in5:3
in6 SENSORS_IT87_IN6 in6:3
in7 SENSORS_IT87_IN7 in7:3
in0_min SENSORS_IT87_IN0_MIN in0:1
in1_min SENSORS_IT87_IN1_MIN in1:1
in2_min SENSORS_IT87_IN2_MIN in2:1
in3_min SENSORS_IT87_IN3_MIN in3:1
in4_min SENSORS_IT87_IN4_MIN in4:1
in5_min SENSORS_IT87_IN5_MIN in5:1
in6_min SENSORS_IT87_IN6_MIN in6:1
in7_min SENSORS_IT87_IN7_MIN in7:1
in0_max SENSORS_IT87_IN0_MAX in0:2
in1_max SENSORS_IT87_IN1_MAX in1:2
in2_max SENSORS_IT87_IN2_MAX in2:2
in3_max SENSORS_IT87_IN3_MAX in3:2
in4_max SENSORS_IT87_IN4_MAX in4:2
in5_max SENSORS_IT87_IN5_MAX in5:2
in6_max SENSORS_IT87_IN6_MAX in6:2
in7_max SENSORS_IT87_IN7_MAX in7:2
fan1 SENSORS_IT87_FAN1 fan1:2
fan2 SENSORS_IT87_FAN2 fan2:2
fan3 SENSORS_IT87_FAN3 fan3:2
fan1_min SENSORS_IT87_FAN1_MIN fan1:1
fan2_min SENSORS_IT87_FAN2_MIN fan2:1
fan3_min SENSORS_IT87_FAN3_MIN fan3:1
temp1 SENSORS_IT87_TEMP1 temp1:3
temp2 SENSORS_IT87_TEMP2 temp2:3
temp3 SENSORS_IT87_TEMP3 temp3:3
temp1_hyst SENSORS_IT87_TEMP1_HYST temp1:2
temp1_over SENSORS_IT87_TEMP1_OVER temp1:1
temp2_hyst SENSORS_IT87_TEMP2_HYST temp2:2
temp2_over SENSORS_IT87_TEMP2_OVER temp2:1
temp3_hyst SENSORS_IT87_TEMP3_HYST temp3:2
temp3_over SENSORS_IT87_TEMP3_OVER temp3:1
vid SENSORS_IT87_VID vid:1
fan1_div SENSORS_IT87_FAN1_DIV fan_div:1
fan2_div SENSORS_IT87_FAN2_DIV fan_div:2
fan3_div SENSORS_IT87_FAN3_DIV fan_div:3
alarms_fan SENSORS_IT87_ALARMS_FAN alarms_fan:1
alarms_vin SENSORS_IT87_ALARMS_VIN alarms_vin:1
alarms_temp SENSORS_IT87_ALARMS_TEMP alarms_temp:1
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