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https://github.com/lm-sensors/lm-sensors.git
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Frodo Looijaard
f48a2146db
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@407 7894878c-1315-0410-8ee3-d5d059ff63e0
135 lines
6.8 KiB
Plaintext
135 lines
6.8 KiB
Plaintext
Kernel driver `sis5595.o'
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=========================
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Status: Complete and tested
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Supported chips:
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* Silicon Integrated Systems Corp. SiS5595 Southbridge Hardware Monitor
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Prefix: sis5595
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Addresses scanned: ISA in PCI-space encoded address
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Datasheet: Publicly available at the Silicon Integrated Systems Corp. site.
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Author: Kyösti Mälkki <kmalkki@cc.hut.fi>
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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_sis5595: 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 `sis5595' 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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The Sis5595 southbridge has integrated hardware monitor functionality.
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It also has an I2C bus, but this driver only supports the hardware monitor.
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The SiS5595 implements one temperature sensor, two FAN rotation speed
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sensors, four voltage sensors and alarms.
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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 Hysteris value. A more useful behaviour
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can be found by setting the Hysteris 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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In addition to the alarms described above, there is a BTI alarm, which gets
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triggered when an external chip has crossed its limits. Usually, this is
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connected to some LM75-like chip; if at least one crosses its limits, this
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bit gets set.
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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 Sis5595 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 `sis5595'
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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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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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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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fan1 NONE NONE R 0
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fan2 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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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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fan1_div fan1 NONE RW 0
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fan2_div fan2 NONE RW 0
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alarms NONE NONE R 0
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LABEL FEATURE SYMBOL SYSCTL FILE:NR
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in0 SENSORS_SIS5595_IN0 in0:3
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in1 SENSORS_SIS5595_IN1 in1:3
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in2 SENSORS_SIS5595_IN2 in2:3
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in3 SENSORS_SIS5595_IN3 in3:3
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in0_min SENSORS_SIS5595_IN0_MIN in0:1
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in1_min SENSORS_SIS5595_IN1_MIN in1:1
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in2_min SENSORS_SIS5595_IN2_MIN in2:1
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in3_min SENSORS_SIS5595_IN3_MIN in3:1
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in0_max SENSORS_SIS5595_IN0_MAX in0:2
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in1_max SENSORS_SIS5595_IN1_MAX in1:2
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in2_max SENSORS_SIS5595_IN2_MAX in2:2
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in3_max SENSORS_SIS5595_IN3_MAX in3:2
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fan1 SENSORS_SIS5595_FAN1 fan1:2
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fan2 SENSORS_SIS5595_FAN2 fan2:2
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fan1_min SENSORS_SIS5595_FAN1_MIN fan1:1
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fan2_min SENSORS_SIS5595_FAN2_MIN fan2:1
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temp SENSORS_SIS5595_TEMP temp:3
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temp_hyst SENSORS_SIS5595_TEMP_HYST temp:2
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temp_over SENSORS_SIS5595_TEMP_OVER temp:1
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fan1_div SENSORS_SIS5595_FAN1_DIV fan_div:1
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fan2_div SENSORS_SIS5595_FAN2_DIV fan_div:2
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alarms SENSORS_SIS5595_ALARMS alarms:1
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