mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-18 11:09:32 +00:00
Mark D. Studebaker
0086b4d99e
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@746 7894878c-1315-0410-8ee3-d5d059ff63e0
340 lines
19 KiB
Plaintext
340 lines
19 KiB
Plaintext
Kernel driver `lm78.o'
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======================
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Status: Complete and well-tested
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Supported chips:
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* National Semiconductors LM78
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Prefix `lm78'
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Addresses scanned: I2C 0x20 - 0x2f (inclusive), ISA 0x290 (8 I/O ports)
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Datasheet: Publicly available at the National Semiconductors website
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* National Semiconductors LM78-J
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Prefix `lm78-j'
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Addresses scanned: I2C 0x20 - 0x2f (inclusive), ISA 0x290 (8 I/O ports)
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Datasheet: Publicly available at the National Semiconductors website
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* National Semiconductors LM79
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Prefix `lm79'
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Addresses scanned: I2C 0x20 - 0x2f (inclusive), ISA 0x290 (8 I/O ports)
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Datasheet: Publicly available at the National Semiconductors website
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Author: Frodo Looijaard <frodol@dds.nl>
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Module Parameters
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-----------------
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* force: short array (min = 1, max = 48)
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List of adapter,address pairs to boldly assume to be present
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* force_lm78: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to contain
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a `lm78' chip
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* force_lm78j: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to contain
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a `lm78j' chip
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* force_lm79: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to contain
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a `lm79' chip
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* ignore: short array (min = 1, max = 48)
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List of adapter,address pairs not to scan
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* ignore_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples not to scan
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* probe: short array (min = 1, max = 48)
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List of adapter,address pairs to scan additionally
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* probe_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples to scan additionally
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Description
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-----------
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This driver implements support for the National Semiconductors LM78, LM78-J
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and LM79. They are described as `Microprocessor System Hardware Monitors'.
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There is almost no difference between the three supported chips. Functionally,
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the LM78 and LM78-J are exactly identical. The LM79 has one more VID line,
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which is used to report the lower voltages newer Pentium processors use.
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From here on, LM7* means either of these three types.
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The LM7* implements one temperature sensor, three FAN rotation speed sensors,
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seven voltage sensors, VID lines, alarms, and some miscellaneous stuff.
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Temperatures are measured in degrees Celcius. An alarm is triggered once
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when the Overtemperature Shutdown limit is crossed; it is triggered again
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as soon as it drops below the Hysteresis value. A more useful behaviour
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can be found by setting the Hysteresis value to +127 degrees Celcius; in
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this case, alarms are issued during all the time when the actual temperature
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is above the Overtemperature Shutdown value. Measurements are guaranteed
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between -55 and +125 degrees, with a resolution of 1 degree.
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FAN rotation speeds are reported in RPM (rotations per minute). An alarm is
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triggered if the rotation speed has dropped below a programmable limit. FAN
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readings can be divided by a programmable divider (1, 2, 4 or 8) to give
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the readings more range or accuracy. This is important because some FANs
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report only one 'tick' each rotation, while others report two - making
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all readings twice as high. Not all RPM values can accurately be represented,
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so some rounding is done. With a divider of 2, the lowest representable
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value is around 2600 RPM.
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Voltage sensors (also known as IN sensors) report their values in volts.
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An alarm is triggered if the voltage has crossed a programmable minimum
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or maximum limit. Note that minimum in this case always means 'closest to
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zero'; this is important for negative voltage measurements. All voltage
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inputs can measure voltages between 0 and 4.08 volts, with a resolution
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of 0.016 volt.
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The VID lines encode the core voltage value: the voltage level your processor
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should work with. This is hardcoded by the mainboard and/or processor itself.
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It is a value in volts. When it is unconnected, you will often find the
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value 3.50 V here.
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In addition to the alarms described above, there are a couple of additional
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ones. There is a BTI alarm, which gets triggered when an external chip has
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crossed its limits. Usually, this is connected to all LM75 chips; if at
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least one crosses its limits, this bit gets set. The CHAS alarm triggers
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if your computer case is open. The FIFO alarms should never trigger; it
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indicates an internal error. The SMI_IN alarm indicates some other chip
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has triggered an SMI interrupt. As we do not use SMI interrupts at all,
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this condition usually indicates there is a problem with some other
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device.
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If an alarm triggers, it will remain triggered until the hardware register
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is read at least once. This means that the cause for the alarm may
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already have disappeared! Note that in the current implementation, all
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hardware registers are read whenever any data is read (unless it is less
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than 1.5 seconds since the last update). This means that you can easily
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miss once-only alarms.
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The LM7* only updates its values each 1.5 seconds; reading it more often
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will do no harm, but will return 'old' values.
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Chip features
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-------------
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Chip `lm78'
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LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
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in0 NONE NONE R 2
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in1 NONE NONE R 2
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in2 NONE NONE R 2
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in3 NONE NONE R 2
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in4 NONE NONE R 2
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in5 NONE NONE R 2
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in6 NONE NONE R 2
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in0_min in0 in0 RW 2
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in1_min in1 in1 RW 2
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in2_min in2 in2 RW 2
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in3_min in3 in3 RW 2
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in4_min in4 in4 RW 2
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in5_min in5 in5 RW 2
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in6_min in6 in6 RW 2
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in0_max in0 in0 RW 2
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in1_max in1 in1 RW 2
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in2_max in2 in2 RW 2
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in3_max in3 in3 RW 2
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in4_max in4 in4 RW 2
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in5_max in5 in5 RW 2
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in6_max in6 in6 RW 2
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fan1 NONE NONE R 0
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fan2 NONE NONE R 0
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fan3 NONE NONE R 0
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fan1_min fan1 fan1 RW 0
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fan2_min fan2 fan2 RW 0
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fan3_min fan3 fan3 RW 0
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temp NONE NONE R 1
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temp_hyst temp temp RW 1
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temp_over temp temp RW 1
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vid NONE NONE R 2
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fan1_div fan1 NONE RW 0
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fan2_div fan2 NONE RW 0
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fan3_div fan3 NONE R 0
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alarms NONE NONE R 0
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LABEL FEATURE SYMBOL SYSCTL FILE:OFFSET
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in0 SENSORS_LM78_IN0 in0:3
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in1 SENSORS_LM78_IN1 in1:3
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in2 SENSORS_LM78_IN2 in2:3
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in3 SENSORS_LM78_IN3 in3:3
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in4 SENSORS_LM78_IN4 in4:3
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in5 SENSORS_LM78_IN5 in5:3
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in6 SENSORS_LM78_IN6 in6:3
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in0_min SENSORS_LM78_IN0_MIN in0:1
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in1_min SENSORS_LM78_IN1_MIN in1:1
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in2_min SENSORS_LM78_IN2_MIN in2:1
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in3_min SENSORS_LM78_IN3_MIN in3:1
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in4_min SENSORS_LM78_IN4_MIN in4:1
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in5_min SENSORS_LM78_IN5_MIN in5:1
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in6_min SENSORS_LM78_IN6_MIN in6:1
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in0_max SENSORS_LM78_IN0_MAX in0:2
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in1_max SENSORS_LM78_IN1_MAX in1:2
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in2_max SENSORS_LM78_IN2_MAX in2:2
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in3_max SENSORS_LM78_IN3_MAX in3:2
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in4_max SENSORS_LM78_IN4_MAX in4:2
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in5_max SENSORS_LM78_IN5_MAX in5:2
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in6_max SENSORS_LM78_IN6_MAX in6:2
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fan1 SENSORS_LM78_FAN1 fan1:2
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fan2 SENSORS_LM78_FAN2 fan2:2
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fan3 SENSORS_LM78_FAN3 fan3:2
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fan1_min SENSORS_LM78_FAN1_MIN fan1:1
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fan2_min SENSORS_LM78_FAN2_MIN fan2:1
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fan3_min SENSORS_LM78_FAN3_MIN fan3:1
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temp SENSORS_LM78_TEMP temp:3
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temp_hyst SENSORS_LM78_TEMP_HYST temp:2
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temp_over SENSORS_LM78_TEMP_OVER temp:1
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vid SENSORS_LM78_VID vid:1
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fan1_div SENSORS_LM78_FAN1_DIV fan_div:1
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fan2_div SENSORS_LM78_FAN2_DIV fan_div:2
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fan3_div SENSORS_LM78_FAN3_DIV fan_div:3
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alarms SENSORS_LM78_ALARMS alarms:1
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Chip `lm78-j'
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LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
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in0 NONE NONE R 2
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in1 NONE NONE R 2
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in2 NONE NONE R 2
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in3 NONE NONE R 2
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in4 NONE NONE R 2
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in5 NONE NONE R 2
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in6 NONE NONE R 2
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in0_min in0 in0 RW 2
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in1_min in1 in1 RW 2
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in2_min in2 in2 RW 2
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in3_min in3 in3 RW 2
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in4_min in4 in4 RW 2
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in5_min in5 in5 RW 2
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in6_min in6 in6 RW 2
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in0_max in0 in0 RW 2
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in1_max in1 in1 RW 2
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in2_max in2 in2 RW 2
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in3_max in3 in3 RW 2
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in4_max in4 in4 RW 2
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in5_max in5 in5 RW 2
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in6_max in6 in6 RW 2
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fan1 NONE NONE R 0
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fan2 NONE NONE R 0
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fan3 NONE NONE R 0
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fan1_min fan1 fan1 RW 0
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fan2_min fan2 fan2 RW 0
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fan3_min fan3 fan3 RW 0
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temp NONE NONE R 1
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temp_hyst temp temp RW 1
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temp_over temp temp RW 1
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vid NONE NONE R 2
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fan1_div fan1 NONE RW 0
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fan2_div fan2 NONE RW 0
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fan3_div fan3 NONE R 0
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alarms NONE NONE R 0
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LABEL FEATURE SYMBOL SYSCTL FILE:OFFSET
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in0 SENSORS_LM78J_IN0 in0:3
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in1 SENSORS_LM78J_IN1 in1:3
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in2 SENSORS_LM78J_IN2 in2:3
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in3 SENSORS_LM78J_IN3 in3:3
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in4 SENSORS_LM78J_IN4 in4:3
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in5 SENSORS_LM78J_IN5 in5:3
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in6 SENSORS_LM78J_IN6 in6:3
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in0_min SENSORS_LM78J_IN0_MIN in0:1
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in1_min SENSORS_LM78J_IN1_MIN in1:1
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in2_min SENSORS_LM78J_IN2_MIN in2:1
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in3_min SENSORS_LM78J_IN3_MIN in3:1
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in4_min SENSORS_LM78J_IN4_MIN in4:1
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in5_min SENSORS_LM78J_IN5_MIN in5:1
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in6_min SENSORS_LM78J_IN6_MIN in6:1
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in0_max SENSORS_LM78J_IN0_MAX in0:2
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in1_max SENSORS_LM78J_IN1_MAX in1:2
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in2_max SENSORS_LM78J_IN2_MAX in2:2
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in3_max SENSORS_LM78J_IN3_MAX in3:2
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in4_max SENSORS_LM78J_IN4_MAX in4:2
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in5_max SENSORS_LM78J_IN5_MAX in5:2
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in6_max SENSORS_LM78J_IN6_MAX in6:2
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fan1 SENSORS_LM78J_FAN1 fan1:2
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fan2 SENSORS_LM78J_FAN2 fan2:2
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fan3 SENSORS_LM78J_FAN3 fan3:2
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fan1_min SENSORS_LM78J_FAN1_MIN fan1:1
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fan2_min SENSORS_LM78J_FAN2_MIN fan2:1
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fan3_min SENSORS_LM78J_FAN3_MIN fan3:1
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temp SENSORS_LM78J_TEMP temp:3
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temp_hyst SENSORS_LM78J_TEMP_HYST temp:2
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temp_over SENSORS_LM78J_TEMP_OVER temp:1
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vid SENSORS_LM78J_VID vid:1
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fan1_div SENSORS_LM78J_FAN1_DIV fan_div:1
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fan2_div SENSORS_LM78J_FAN2_DIV fan_div:2
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fan3_div SENSORS_LM78J_FAN3_DIV fan_div:3
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alarms SENSORS_LM78J_ALARMS alarms:1
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Chip `lm79'
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LABEL LABEL CLASS COMPUTE CLASS ACCESS MAGNITUDE
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in0 NONE NONE R 2
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in1 NONE NONE R 2
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in2 NONE NONE R 2
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in3 NONE NONE R 2
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in4 NONE NONE R 2
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in5 NONE NONE R 2
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in6 NONE NONE R 2
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in0_min in0 in0 RW 2
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in1_min in1 in1 RW 2
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in2_min in2 in2 RW 2
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in3_min in3 in3 RW 2
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in4_min in4 in4 RW 2
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in5_min in5 in5 RW 2
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in6_min in6 in6 RW 2
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in0_max in0 in0 RW 2
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in1_max in1 in1 RW 2
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in2_max in2 in2 RW 2
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in3_max in3 in3 RW 2
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in4_max in4 in4 RW 2
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in5_max in5 in5 RW 2
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in6_max in6 in6 RW 2
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fan1 NONE NONE R 0
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fan2 NONE NONE R 0
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fan3 NONE NONE R 0
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fan1_min fan1 fan1 RW 0
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fan2_min fan2 fan2 RW 0
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fan3_min fan3 fan3 RW 0
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temp NONE NONE R 1
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temp_hyst temp temp RW 1
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temp_over temp temp RW 1
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vid NONE NONE R 2
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fan1_div fan1 NONE RW 0
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fan2_div fan2 NONE RW 0
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fan3_div fan3 NONE R 0
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alarms NONE NONE R 0
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LABEL FEATURE SYMBOL SYSCTL FILE:OFFSET
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in0 SENSORS_LM79_IN0 in0:3
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in1 SENSORS_LM79_IN1 in1:3
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in2 SENSORS_LM79_IN2 in2:3
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in3 SENSORS_LM79_IN3 in3:3
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in4 SENSORS_LM79_IN4 in4:3
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in5 SENSORS_LM79_IN5 in5:3
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in6 SENSORS_LM79_IN6 in6:3
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in0_min SENSORS_LM79_IN0_MIN in0:1
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in1_min SENSORS_LM79_IN1_MIN in1:1
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in2_min SENSORS_LM79_IN2_MIN in2:1
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in3_min SENSORS_LM79_IN3_MIN in3:1
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in4_min SENSORS_LM79_IN4_MIN in4:1
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in5_min SENSORS_LM79_IN5_MIN in5:1
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in6_min SENSORS_LM79_IN6_MIN in6:1
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in0_max SENSORS_LM79_IN0_MAX in0:2
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in1_max SENSORS_LM79_IN1_MAX in1:2
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in2_max SENSORS_LM79_IN2_MAX in2:2
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in3_max SENSORS_LM79_IN3_MAX in3:2
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in4_max SENSORS_LM79_IN4_MAX in4:2
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in5_max SENSORS_LM79_IN5_MAX in5:2
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in6_max SENSORS_LM79_IN6_MAX in6:2
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fan1 SENSORS_LM79_FAN1 fan1:2
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fan2 SENSORS_LM79_FAN2 fan2:2
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fan3 SENSORS_LM79_FAN3 fan3:2
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fan1_min SENSORS_LM79_FAN1_MIN fan1:1
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fan2_min SENSORS_LM79_FAN2_MIN fan2:1
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fan3_min SENSORS_LM79_FAN3_MIN fan3:1
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temp SENSORS_LM79_TEMP temp:3
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temp_hyst SENSORS_LM79_TEMP_HYST temp:2
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temp_over SENSORS_LM79_TEMP_OVER temp:1
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vid SENSORS_LM79_VID vid:1
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fan1_div SENSORS_LM79_FAN1_DIV fan_div:1
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fan2_div SENSORS_LM79_FAN2_DIV fan_div:2
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fan3_div SENSORS_LM79_FAN3_DIV fan_div:3
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alarms SENSORS_LM79_ALARMS alarms:1
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