c5e3fbf22c
Only scan I2C address 0x2d. This is the default address and no IT87xxF chip was ever seen on I2C at a different address. These chips are better accessed through their ISA interface anyway. This fixes bug #5889, although it doesn't address the whole class of problems. We'd need the ability to blacklist arbitrary I2C addresses on systems known to contain I2C devices which behave badly when probed. Plan the I2C interface for removal as well. If nobody complains within a year, it will confirm my impression that the I2C interface isn't actually needed by anyone. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
97 lines
4.1 KiB
Plaintext
97 lines
4.1 KiB
Plaintext
Kernel driver it87
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==================
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Supported chips:
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* IT8705F
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Prefix: 'it87'
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Addresses scanned: from Super I/O config space (8 I/O ports)
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Datasheet: Publicly available at the ITE website
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http://www.ite.com.tw/
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* IT8712F
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Prefix: 'it8712'
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Addresses scanned: I2C 0x2d
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from Super I/O config space (8 I/O ports)
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Datasheet: Publicly available at the ITE website
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http://www.ite.com.tw/
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* SiS950 [clone of IT8705F]
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Prefix: 'it87'
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Addresses scanned: from Super I/O config space (8 I/O ports)
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Datasheet: No longer be available
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Author: Christophe Gauthron <chrisg@0-in.com>
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Module Parameters
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-----------------
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* update_vbat: int
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0 if vbat should report power on value, 1 if vbat should be updated after
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each read. Default is 0. On some boards the battery voltage is provided
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by either the battery or the onboard power supply. Only the first reading
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at power on will be the actual battery voltage (which the chip does
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automatically). On other boards the battery voltage is always fed to
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the chip so can be read at any time. Excessive reading may decrease
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battery life but no information is given in the datasheet.
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* fix_pwm_polarity int
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Force PWM polarity to active high (DANGEROUS). Some chips are
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misconfigured by BIOS - PWM values would be inverted. This option tries
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to fix this. Please contact your BIOS manufacturer and ask him for fix.
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Description
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-----------
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This driver implements support for the IT8705F, IT8712F and SiS950 chips.
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This driver also supports IT8712F, which adds SMBus access, and a VID
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input, used to report the Vcore voltage of the Pentium processor.
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The IT8712F additionally features VID inputs.
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These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
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joysticks and other miscellaneous stuff. For hardware monitoring, they
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include an 'environment controller' with 3 temperature sensors, 3 fan
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rotation speed sensors, 8 voltage sensors, and associated 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.
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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 the
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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. The battery voltage in8 does not have limit registers.
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The VID lines (IT8712F only) encode the core voltage value: the voltage
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level your processor should work with. This is hardcoded by the mainboard
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and/or processor itself. It is a value in volts.
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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 IT87xx 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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To change sensor N to a thermistor, 'echo 2 > tempN_type' where N is 1, 2,
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or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
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Give 0 for unused sensor. Any other value is invalid. To configure this at
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startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor;
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3 = thermal diode)
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The fan speed control features are limited to manual PWM mode. Automatic
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"Smart Guardian" mode control handling is not implemented. However
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if you want to go for "manual mode" just write 1 to pwmN_enable.
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