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(mds) add via686a documentation.
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@745 7894878c-1315-0410-8ee3-d5d059ff63e0
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@@ -34,7 +34,7 @@ SUPPORTED SENSOR CHIPS
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Included Sensors Controls Busses
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---------------------- ------- -----------
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Driver Chips #temp #vin #fanin pwm/dac i2c ISA
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Driver Chips #temp #vin #fanin pwm/dac I2C ISA
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---------------------------------------------------------------------
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adm1021
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adm1021 2 - - - yes no
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@@ -80,12 +80,15 @@ maxilife
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maxilife-cg 5 4 3 - yes no
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sis5595
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sis5595 1 7 3 - no yes
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sis5595 1 4 2 - no yes
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thmc50
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adm1022 3 2 - 1 dac yes no
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thmc50 3 2 - 1 dac yes no
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via686a
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via686a 3 5 2 - no yes
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w83781d
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as99127f 3 9 3 2-4 pwm yes no
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w83781d 3 7 3 - yes yes
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@@ -105,6 +108,9 @@ Driver Chips
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bt869
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bt869 video modulator chip
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ddcmon
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DDC-compliant monitor integrated eeproms - reads locations only
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eeprom
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Memory SPD (serial presence detect) eeproms - reads locations only
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Xeon scratch eeproms - reads locations only
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@@ -0,0 +1,137 @@
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Kernel driver `via686a.o'
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=========================
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Status: Complete and tested
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Supported chips:
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* Via 686a Southbridge Integrated Hardware Monitor
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Prefix: via686a
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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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Authors: Kyösti Mälkki <kmalkki@cc.hut.fi>,
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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Module Parameters
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-----------------
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none
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Description
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-----------
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The Via 686a 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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For the I2C bus driver, see ../busses/i2c-viapro.
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The Via 686a implements three temperature sensors, two FAN rotation speed
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sensors, five 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 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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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 `via686a'
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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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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 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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in4_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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temp2 NONE NONE R 1
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temp2_hyst temp temp RW 1
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temp2_over temp temp RW 1
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temp3 NONE NONE R 1
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temp3_hyst temp temp RW 1
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temp3_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_VIA686A_IN0 in0:3
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in1 SENSORS_VIA686A_IN1 in1:3
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in2 SENSORS_VIA686A_IN2 in2:3
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in3 SENSORS_VIA686A_IN3 in3:3
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in4 SENSORS_VIA686A_IN4 in4:3
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in0_min SENSORS_VIA686A_IN0_MIN in0:1
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in1_min SENSORS_VIA686A_IN1_MIN in1:1
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in2_min SENSORS_VIA686A_IN2_MIN in2:1
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in3_min SENSORS_VIA686A_IN3_MIN in3:1
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in4_min SENSORS_VIA686A_IN4_MIN in4:1
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in0_max SENSORS_VIA686A_IN0_MAX in0:2
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in1_max SENSORS_VIA686A_IN1_MAX in1:2
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in2_max SENSORS_VIA686A_IN2_MAX in2:2
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in3_max SENSORS_VIA686A_IN3_MAX in3:2
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in4_max SENSORS_VIA686A_IN4_MAX in4:2
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fan1 SENSORS_VIA686A_FAN1 fan1:2
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fan2 SENSORS_VIA686A_FAN2 fan2:2
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fan1_min SENSORS_VIA686A_FAN1_MIN fan1:1
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fan2_min SENSORS_VIA686A_FAN2_MIN fan2:1
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temp SENSORS_VIA686A_TEMP temp:3
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temp_hyst SENSORS_VIA686A_TEMP_HYST temp:2
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temp_over SENSORS_VIA686A_TEMP_OVER temp:1
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temp2 SENSORS_VIA686A_TEMP2 temp2:3
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temp2_hyst SENSORS_VIA686A_TEMP2_HYST temp2:2
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temp2_over SENSORS_VIA686A_TEMP2_OVER temp2:1
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temp3 SENSORS_VIA686A_TEMP3 temp3:3
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temp3_hyst SENSORS_VIA686A_TEMP3_HYST temp3:2
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temp3_over SENSORS_VIA686A_TEMP3_OVER temp3:1
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fan1_div SENSORS_VIA686A_FAN1_DIV fan_div:1
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fan2_div SENSORS_VIA686A_FAN2_DIV fan_div:2
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alarms SENSORS_VIA686A_ALARMS alarms:1
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