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0ea6e61122
Below you will find an updated version from the original series bunching all patches into one big patch updating broken web addresses that are located in Documentation/* Some of the addresses date as far far back as 1995 etc... so searching became a bit difficult, the best way to deal with these is to use web.archive.org to locate these addresses that are outdated. Now there are also some addresses pointing to .spec files some are located, but some(after searching on the companies site)where still no where to be found. In this case I just changed the address to the company site this way the users can contact the company and they can locate them for the users. Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Thomas Weber <weber@corscience.de> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Cc: Paulo Marques <pmarques@grupopie.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Cc: Michael Neuling <mikey@neuling.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
79 lines
3.4 KiB
Plaintext
79 lines
3.4 KiB
Plaintext
Kernel driver via686a
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=====================
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Supported chips:
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* Via VT82C686A, VT82C686B 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: On request through web form (http://www.via.com.tw/en/resources/download-center/)
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Authors:
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Kyösti Mälkki <kmalkki@cc.hut.fi>,
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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Bob Dougherty <bobd@stanford.edu>
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(Some conversion-factor data were contributed by
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Jonathan Teh Soon Yew <j.teh@iname.com>
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and Alex van Kaam <darkside@chello.nl>.)
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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 that
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don't set the address in the BIOS. Look for a BIOS
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upgrade before resorting to this. Does not do a
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PCI force; the via686a must still be present in lspci.
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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 via686a force_addr=0x6000'
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Description
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-----------
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The driver does not distinguish between the chips and reports
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all as a 686A.
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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 <file:Documentation/i2c/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 Celsius. 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.
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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. Not all RPM values can accurately be
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represented, so some rounding is done. With a divider of 2, the lowest
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representable 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. Voltages are internally scalled, so each voltage channel
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has a different resolution and range.
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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 driver 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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Known Issues
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------------
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This driver handles sensors integrated in some VIA south bridges. It is
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possible that a motherboard maker used a VT82C686A/B chip as part of a
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product design but was not interested in its hardware monitoring features,
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in which case the sensor inputs will not be wired. This is the case of
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the Asus K7V, A7V and A7V133 motherboards, to name only a few of them.
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So, if you need the force_addr parameter, and end up with values which
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don't seem to make any sense, don't look any further: your chip is simply
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not wired for hardware monitoring.
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