87673dd735
it87: Add support for the IT8718F The IT8718F is a Super-I/O chip with integrated hardware monitoring functions. It is very similar to the IT8716F, so adding support to the it87 driver was pretty straightforward. The most significant difference is that the IT8718F has up to 8 VID pins, instead of 6 for the older chips. For the IT8718F, the VID value can only be read from Super-I/O space. Userspace support is already in lm_sensors SVN (to be soon released as 2.10.1.) Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
128 lines
5.7 KiB
Plaintext
128 lines
5.7 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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* IT8716F
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Prefix: 'it8716'
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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/product_info/file/pc/IT8716F_V0.3.ZIP
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* IT8718F
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Prefix: 'it8718'
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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/product_info/file/pc/IT8718F_V0.2.zip
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http://www.ite.com.tw/product_info/file/pc/IT8718F_V0%203_(for%20C%20version).zip
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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, IT8716F,
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IT8718F and SiS950 chips.
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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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The IT8712F and IT8716F additionally feature VID inputs, used to report
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the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
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the IT8716F and late IT8712F have 6. They are shared with other functions
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though, so the functionality may not be available on a given system.
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The driver dumbly assume it is there.
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The IT8718F also features VID inputs (up to 8 pins) but the value is
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stored in the Super-I/O configuration space. Due to technical limitations,
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this value can currently only be read once at initialization time, so
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the driver won't notice and report changes in the VID value. The two
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upper VID bits share their pins with voltage inputs (in5 and in6) so you
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can't have both on a given board.
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The IT8716F, IT8718F and later IT8712F revisions have support for
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2 additional fans. They are not yet supported by the driver.
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The IT8716F and IT8718F, and late IT8712F and IT8705F also have optional
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16-bit tachometer counters for fans 1 to 3. This is better (no more fan
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clock divider mess) but not compatible with the older chips and
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revisions. For now, the driver only uses the 16-bit mode on the
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IT8716F and IT8718F.
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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. When
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16-bit tachometer counters aren't used, fan readings can be divided by
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a programmable divider (1, 2, 4 or 8) to give the readings more range or
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accuracy. With a divider of 2, the lowest representable value is around
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2600 RPM. Not all RPM values can accurately be represented, so some rounding
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is done.
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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/IT8716F/IT8718F) encode the core voltage value:
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the voltage level your processor should work with. This is hardcoded by
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the mainboard 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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