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348 lines
12 KiB
348 lines
12 KiB
Kernel driver it87 |
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================== |
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Supported chips: |
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* IT8603E/IT8623E |
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Prefix: 'it8603' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8620E |
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Prefix: 'it8620' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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* IT8628E |
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Prefix: 'it8628' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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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: Once publicly available at the ITE website, but no longer |
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* IT8712F |
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Prefix: 'it8712' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Once publicly available at the ITE website, but no longer |
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* IT8716F/IT8726F |
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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: Once publicly available at the ITE website, but no longer |
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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: Once publicly available at the ITE website, but no longer |
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* IT8720F |
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Prefix: 'it8720' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8721F/IT8758E |
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Prefix: 'it8721' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8728F |
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Prefix: 'it8728' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8732F |
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Prefix: 'it8732' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8771E |
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Prefix: 'it8771' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8772E |
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Prefix: 'it8772' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8781F |
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Prefix: 'it8781' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8782F |
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Prefix: 'it8782' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8783E/F |
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Prefix: 'it8783' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8786E |
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Prefix: 'it8786' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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* IT8790E |
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Prefix: 'it8790' |
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Addresses scanned: from Super I/O config space (8 I/O ports) |
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Datasheet: Not publicly available |
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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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Authors: |
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- Christophe Gauthron |
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- Jean Delvare <[email protected]> |
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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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Hardware Interfaces |
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------------------- |
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All the chips supported by this driver are LPC Super-I/O chips, accessed |
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through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an |
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SMBus interface to the hardware monitoring functions. This driver no |
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longer supports this interface though, as it is slower and less reliable |
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than the ISA access, and was only available on a small number of |
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motherboard models. |
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Description |
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----------- |
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This driver implements support for the IT8603E, IT8620E, IT8623E, IT8628E, |
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IT8705F, IT8712F, IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8732F, |
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IT8758E, IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, IT8790E, and |
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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, associated alarms, and chassis |
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intrusion detection. |
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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 IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value |
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is 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, IT8720F, IT8721F/IT8758E and later IT8712F revisions |
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have support for 2 additional fans. The additional fans are supported by the |
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driver. |
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The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E, IT8732F, IT8781F, IT8782F, |
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IT8783E/F, and late IT8712F and IT8705F also have optional 16-bit tachometer |
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counters for fans 1 to 3. This is better (no more fan clock divider mess) but |
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not compatible with the older chips and revisions. The 16-bit tachometer mode |
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is enabled by the driver when one of the above chips is detected. |
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The IT8726F is just bit enhanced IT8716F with additional hardware |
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for AMD power sequencing. Therefore the chip will appear as IT8716F |
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to userspace applications. |
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The IT8728F, IT8771E, and IT8772E are considered compatible with the IT8721F, |
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until a datasheet becomes available (hopefully.) |
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The IT8603E/IT8623E is a custom design, hardware monitoring part is similar to |
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IT8728F. It only supports 3 fans, 16-bit fan mode, and the full speed mode |
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of the fan is not supported (value 0 of pwmX_enable). |
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The IT8620E and IT8628E are custom designs, hardware monitoring part is similar |
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to IT8728F. It only supports 16-bit fan mode. Both chips support up to 6 fans. |
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The IT8790E supports up to 3 fans. 16-bit fan mode is always enabled. |
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The IT8732F supports a closed-loop mode for fan control, but this is not |
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currently implemented by the driver. |
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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. On most chips, all |
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voltage inputs can measure voltages between 0 and 4.08 volts, with a resolution |
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of 0.016 volt. IT8603E, IT8721F/IT8758E and IT8728F can measure between 0 and |
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3.06 volts, with a resolution of 0.012 volt. IT8732F can measure between 0 and |
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2.8 volts with a resolution of 0.0109 volt. The battery voltage in8 does not |
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have limit registers. |
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On the IT8603E, IT8620E, IT8628E, IT8721F/IT8758E, IT8732F, IT8781F, IT8782F, |
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and IT8783E/F, some voltage inputs are internal and scaled inside the chip: |
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* in3 (optional) |
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* in7 (optional for IT8781F, IT8782F, and IT8783E/F) |
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* in8 (always) |
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* in9 (relevant for IT8603E only) |
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The driver handles this transparently so user-space doesn't have to care. |
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The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) 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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Out-of-limit readings can also result in beeping, if the chip is properly |
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wired and configured. Beeping can be enabled or disabled per sensor type |
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(temperatures, voltages and fans.) |
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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 4 > 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. (4 = thermistor; |
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3 = thermal diode) |
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Fan speed control |
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----------------- |
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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 only implemented for older chips |
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(see below.) However if you want to go for "manual mode" just write 1 to |
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pwmN_enable. |
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If you are only able to control the fan speed with very small PWM values, |
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try lowering the PWM base frequency (pwm1_freq). Depending on the fan, |
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it may give you a somewhat greater control range. The same frequency is |
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used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are |
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read-only. |
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Automatic fan speed control (old interface) |
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------------------------------------------- |
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The driver supports the old interface to automatic fan speed control |
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which is implemented by IT8705F chips up to revision F and IT8712F |
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chips up to revision G. |
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This interface implements 4 temperature vs. PWM output trip points. |
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The PWM output of trip point 4 is always the maximum value (fan running |
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at full speed) while the PWM output of the other 3 trip points can be |
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freely chosen. The temperature of all 4 trip points can be freely chosen. |
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Additionally, trip point 1 has an hysteresis temperature attached, to |
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prevent fast switching between fan on and off. |
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The chip automatically computes the PWM output value based on the input |
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temperature, based on this simple rule: if the temperature value is |
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between trip point N and trip point N+1 then the PWM output value is |
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the one of trip point N. The automatic control mode is less flexible |
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than the manual control mode, but it reacts faster, is more robust and |
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doesn't use CPU cycles. |
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Trip points must be set properly before switching to automatic fan speed |
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control mode. The driver will perform basic integrity checks before |
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actually switching to automatic control mode. |
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Temperature offset attributes |
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----------------------------- |
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The driver supports temp[1-3]_offset sysfs attributes to adjust the reported |
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temperature for thermal diodes or diode-connected thermal transistors. |
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If a temperature sensor is configured for thermistors, the attribute values |
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are ignored. If the thermal sensor type is Intel PECI, the temperature offset |
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must be programmed to the critical CPU temperature.
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