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-Kernel driver it87
-==================
-
-Supported chips:
- * IT8705F
- Prefix: 'it87'
- Addresses scanned: from Super I/O config space, or default ISA 0x290 (8 I/O ports)
- Datasheet: Publicly available at the ITE website
- http://www.ite.com.tw/
- * IT8712F
- Prefix: 'it8712'
- Addresses scanned: I2C 0x28 - 0x2f
- from Super I/O config space, or default ISA 0x290 (8 I/O ports)
- Datasheet: Publicly available at the ITE website
- http://www.ite.com.tw/
- * SiS950 [clone of IT8705F]
- Prefix: 'sis950'
- Addresses scanned: from Super I/O config space, or default ISA 0x290 (8 I/O ports)
- Datasheet: No longer be available
-
-Author: Christophe Gauthron <chrisg@0-in.com>
-
-
-Module Parameters
------------------
-
-* update_vbat: int
-
- 0 if vbat should report power on value, 1 if vbat should be updated after
- each read. Default is 0. On some boards the battery voltage is provided
- by either the battery or the onboard power supply. Only the first reading
- at power on will be the actual battery voltage (which the chip does
- automatically). On other boards the battery voltage is always fed to
- the chip so can be read at any time. Excessive reading may decrease
- battery life but no information is given in the datasheet.
-
-* fix_pwm_polarity int
-
- Force PWM polarity to active high (DANGEROUS). Some chips are
- misconfigured by BIOS - PWM values would be inverted. This option tries
- to fix this. Please contact your BIOS manufacturer and ask him for fix.
-
-Description
------------
-
-This driver implements support for the IT8705F, IT8712F and SiS950 chips.
-
-This driver also supports IT8712F, which adds SMBus access, and a VID
-input, used to report the Vcore voltage of the Pentium processor.
-The IT8712F additionally features VID inputs.
-
-These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
-joysticks and other miscellaneous stuff. For hardware monitoring, they
-include an 'environment controller' with 3 temperature sensors, 3 fan
-rotation speed sensors, 8 voltage sensors, and associated alarms.
-
-Temperatures are measured in degrees Celsius. An alarm is triggered once
-when the Overtemperature Shutdown limit is crossed.
-
-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. Note that minimum in this case always means 'closest to
-zero'; this is important for negative voltage measurements. All voltage
-inputs can measure voltages between 0 and 4.08 volts, with a resolution of
-0.016 volt. The battery voltage in8 does not have limit registers.
-
-The VID lines (IT8712F only) encode the core voltage value: the voltage
-level your processor should work with. This is hardcoded by the mainboard
-and/or processor itself. It is a value in volts.
-
-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 IT87xx only updates its values each 1.5 seconds; reading it more often
-will do no harm, but will return 'old' values.
-
-To change sensor N to a thermistor, 'echo 2 > tempN_type' where N is 1, 2,
-or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.
-Give 0 for unused sensor. Any other value is invalid. To configure this at
-startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor;
-3 = thermal diode)
-
-The fan speed control features are limited to manual PWM mode. Automatic
-"Smart Guardian" mode control handling is not implemented. However
-if you want to go for "manual mode" just write 1 to pwmN_enable.