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Diffstat (limited to 'Documentation/i2c/chips/it87')
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diff --git a/Documentation/i2c/chips/it87 b/Documentation/i2c/chips/it87 deleted file mode 100644 index 0d0195040d88..000000000000 --- a/Documentation/i2c/chips/it87 +++ /dev/null @@ -1,96 +0,0 @@ -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. |