7f15b66468
This patch adds missing documentation for system health monitoring chips. I would like to thank all people, who helped me with this project. Signed-off-by: Rudolf Marek <r.marek@sh.cvut.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
107 lines
4.3 KiB
Plaintext
107 lines
4.3 KiB
Plaintext
Kernel driver sis5595
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=====================
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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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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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Aurelien Jarno <aurelien@aurel32.net> 2.6 port
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SiS southbridge has a LM78-like chip integrated on the same IC.
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This driver is a customized copy of lm78.c
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Supports following revisions:
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Version PCI ID PCI Revision
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1 1039/0008 AF or less
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2 1039/0008 B0 or greater
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Note: these chips contain a 0008 device which is incompatible with the
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5595. We recognize these by the presence of the listed
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"blacklist" PCI ID and refuse to load.
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NOT SUPPORTED PCI ID BLACKLIST PCI ID
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540 0008 0540
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550 0008 0550
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5513 0008 5511
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5581 0008 5597
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5582 0008 5597
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5597 0008 5597
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630 0008 0630
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645 0008 0645
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730 0008 0730
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735 0008 0735
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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. Does not do a
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PCI force; the device 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 sis5595 force_addr=0x290'
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Description
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-----------
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The SiS5595 southbridge has integrated hardware monitor functions. It also
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has an I2C bus, but this driver only supports the hardware monitor. For the
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I2C bus driver see i2c-sis5595.
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The SiS5595 implements zero or one temperature sensor, two fan speed
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sensors, four or five voltage sensors, and alarms.
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On the first version of the chip, there are four voltage sensors and one
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temperature sensor.
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On the second version of the chip, the temperature sensor (temp) and the
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fifth voltage sensor (in4) share a pin which is configurable, but not
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through the driver. Sorry. The driver senses the configuration of the pin,
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which was hopefully set by the BIOS.
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Temperatures are measured in degrees Celsius. An alarm is triggered once
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when the max is crossed; it is also triggered when it drops below the min
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value. Measurements are guaranteed between -55 and +125 degrees, with a
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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. 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. An
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alarm is triggered if the voltage has crossed a programmable minimum or
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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 of
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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 already
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have disappeared! Note that in the current implementation, all hardware
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registers are read whenever any data is read (unless it is less than 1.5
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seconds since the last update). This means that you can easily miss
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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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Problems
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--------
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Some chips refuse to be enabled. We don't know why.
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The driver will recognize this and print a message in dmesg.
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