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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-04-17 06:46:29 -0300
committerGuenter Roeck <linux@roeck-us.net>2019-04-17 10:37:23 -0700
commit7ebd8b66dd9e5a0b65e5ee5e2b8e7ca382ec97b7 (patch)
tree9db30159bd32bec125c7d49e80a79bb7c4da0c8e /Documentation/hwmon/via686a
parentb04f2f7d387b3160883c2a1f5e2285483a791e82 (diff)
downloadlinux-7ebd8b66dd9e5a0b65e5ee5e2b8e7ca382ec97b7.tar.bz2
docs: hwmon: Add an index file and rename docs to *.rst
Now that all files were converted to ReST format, rename them and add an index. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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-Kernel driver via686a
-=====================
-
-Supported chips:
-
- * Via VT82C686A, VT82C686B Southbridge Integrated Hardware Monitor
-
- Prefix: 'via686a'
-
- Addresses scanned: ISA in PCI-space encoded address
-
- Datasheet: On request through web form (http://www.via.com.tw/en/resources/download-center/)
-
-Authors:
- - Kyösti Mälkki <kmalkki@cc.hut.fi>,
- - Mark D. Studebaker <mdsxyz123@yahoo.com>
- - Bob Dougherty <bobd@stanford.edu>
- - (Some conversion-factor data were contributed by
- - Jonathan Teh Soon Yew <j.teh@iname.com>
- - and Alex van Kaam <darkside@chello.nl>.)
-
-Module Parameters
------------------
-
-======================= =======================================================
-force_addr=0xaddr Set the I/O base address. Useful for boards that
- don't set the address in the BIOS. Look for a BIOS
- upgrade before resorting to this. Does not do a
- PCI force; the via686a must still be present in lspci.
- Don't use this unless the driver complains that the
- base address is not set.
- Example: 'modprobe via686a force_addr=0x6000'
-======================= =======================================================
-
-Description
------------
-
-The driver does not distinguish between the chips and reports
-all as a 686A.
-
-The Via 686a southbridge has integrated hardware monitor functionality.
-It also has an I2C bus, but this driver only supports the hardware monitor.
-For the I2C bus driver, see <file:Documentation/i2c/busses/i2c-viapro>
-
-The Via 686a implements three temperature sensors, two fan rotation speed
-sensors, five voltage sensors and alarms.
-
-Temperatures are measured in degrees Celsius. An alarm is triggered once
-when the Overtemperature Shutdown limit is crossed; it is triggered again
-as soon as it drops below the hysteresis value.
-
-Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
-triggered if the rotation speed has dropped below a programmable limit. Fan
-readings can be divided by a programmable divider (1, 2, 4 or 8) to give
-the readings more range or accuracy. Not all RPM values can accurately be
-represented, so some rounding is done. With a divider of 2, the lowest
-representable value is around 2600 RPM.
-
-Voltage sensors (also known as IN sensors) report their values in volts.
-An alarm is triggered if the voltage has crossed a programmable minimum
-or maximum limit. Voltages are internally scalled, so each voltage channel
-has a different resolution and range.
-
-If an alarm triggers, it will remain triggered until the hardware register
-is read at least once. This means that the cause for the alarm may
-already have disappeared! Note that in the current implementation, all
-hardware registers are read whenever any data is read (unless it is less
-than 1.5 seconds since the last update). This means that you can easily
-miss once-only alarms.
-
-The driver only updates its values each 1.5 seconds; reading it more often
-will do no harm, but will return 'old' values.
-
-Known Issues
-------------
-
-This driver handles sensors integrated in some VIA south bridges. It is
-possible that a motherboard maker used a VT82C686A/B chip as part of a
-product design but was not interested in its hardware monitoring features,
-in which case the sensor inputs will not be wired. This is the case of
-the Asus K7V, A7V and A7V133 motherboards, to name only a few of them.
-So, if you need the force_addr parameter, and end up with values which
-don't seem to make any sense, don't look any further: your chip is simply
-not wired for hardware monitoring.