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https://github.com/lm-sensors/lm-sensors.git
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Mark D. Studebaker
4572d72782
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1678 7894878c-1315-0410-8ee3-d5d059ff63e0
75 lines
2.5 KiB
Plaintext
75 lines
2.5 KiB
Plaintext
Kernel driver `vt1211.o'
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=========================
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Status: Beta.
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Supported chips:
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* Via VT1211 Super I/O Controller
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Addresses scanned: none, address read from Super I/O config space
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Authors: Mark D. Studebaker <mdsxyz123@yahoo.com>
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Module Parameters
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-----------------
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force_addr=0xaddr Set the I/O base address. Useful for boards
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that don't set the address in the BIOS.
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Don't use this unless the driver complains that the
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base address is not set.
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Example: 'modprobe vt1211 force_addr=0x680'
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Description
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-----------
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The Via VT1211 Super I/O chip
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contains voltage/temperature monitoring and
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PWM control circuitry for two fans.
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We define the sensors as follows. Somewhat convoluted to minimize
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changes from via686a. Temp1 and in6 are unimplemented in the vt1211
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chip but are included in the driver.
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Sensor Voltage Mode Temp Mode uch_config bit
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-------- ------------ --------- --------------
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Reading 1 temp3
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Reading 3 temp1
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UCH1/Reading2 in0 temp2 0x04 (4)
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UCH2 in1 temp4 0x08 (8)
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UCH3 in2 temp5 0x10 (16)
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UCH4 in3 temp6 0x20 (32)
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UCH5 in4 temp7 0x40 (64)
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3.3V in5
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-12V in6
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As noted above, 5 of the sensors are "universal channels" and can
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be set for either voltage or temperature.
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Set the uch_config bit (in /proc) to 0 for voltage and 1 for temperature.
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Voltages will read 0 if set for temperature.
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Temperatures will read a really low number if set for voltage.
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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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PWM values are from 0 to 255. The first value in the /proc entry is
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the pwm value; the second is the enable (0 or 1).
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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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**********************
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The lm_sensors project gratefully acknowledges the support of
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Via in the development of this driver.
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