82 lines
3.5 KiB
Plaintext
82 lines
3.5 KiB
Plaintext
|
Note
|
||
|
|
====
|
||
|
|
|
||
|
|
This driver supersedes the NCT6775F and NCT6776F support in the W83627EHF
|
||
|
|
driver.
|
||
|
|
|
||
|
|
Kernel driver NCT6775
|
||
|
|
=====================
|
||
|
|
|
||
|
|
Supported chips:
|
||
|
|
* Nuvoton NCT6775F/W83667HG-I
|
||
|
|
Prefix: 'nct6775'
|
||
|
|
Addresses scanned: ISA address retrieved from Super I/O registers
|
||
|
|
Datasheet: Available from Nuvoton upon request
|
||
|
|
* Nuvoton NCT6776F
|
||
|
|
Prefix: 'nct6776'
|
||
|
|
Addresses scanned: ISA address retrieved from Super I/O registers
|
||
|
|
Datasheet: Available from Nuvoton upon request
|
||
|
|
* Nuvoton NCT6779D
|
||
|
|
Prefix: 'nct6779'
|
||
|
|
Addresses scanned: ISA address retrieved from Super I/O registers
|
||
|
|
Datasheet: Available from Nuvoton upon request
|
||
|
|
|
||
|
|
Authors:
|
||
|
|
Guenter Roeck <linux@roeck-us.net>
|
||
|
|
|
||
|
|
Description
|
||
|
|
-----------
|
||
|
|
|
||
|
|
This driver implements support for the Nuvoton NCT6775F, NCT6776F, and NCT6779D
|
||
|
|
super I/O chips.
|
||
|
|
|
||
|
|
The chips support up to 25 temperature monitoring sources. Up to 6 of those are
|
||
|
|
direct temperature sensor inputs, the others are special sources such as PECI,
|
||
|
|
PCH, and SMBUS. Depending on the chip type, 2 to 6 of the temperature sources
|
||
|
|
can be monitored and compared against minimum, maximum, and critical
|
||
|
|
temperatures. The driver reports up to 10 of the temperatures to the user.
|
||
|
|
There are 4 to 5 fan rotation speed sensors, 8 to 15 analog voltage sensors,
|
||
|
|
one VID, alarms with beep warnings (control unimplemented), and some automatic
|
||
|
|
fan regulation strategies (plus manual fan control mode).
|
||
|
|
|
||
|
|
The temperature sensor sources on all chips are configurable. The configured
|
||
|
|
source for each of the temperature sensors is provided in tempX_label.
|
||
|
|
|
||
|
|
Temperatures are measured in degrees Celsius and measurement resolution is
|
||
|
|
either 1 degC or 0.5 degC, depending on the temperature source and
|
||
|
|
configuration. An alarm is triggered when the temperature gets higher than
|
||
|
|
the high limit; it stays on until the temperature falls below the hysteresis
|
||
|
|
value. Alarms are only supported for temp1 to temp6, depending on the chip type.
|
||
|
|
|
||
|
|
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
|
||
|
|
triggered if the rotation speed has dropped below a programmable limit. On
|
||
|
|
NCT6775F, fan readings can be divided by a programmable divider (1, 2, 4, 8,
|
||
|
|
16, 32, 64 or 128) to give the readings more range or accuracy; the other chips
|
||
|
|
do not have a fan speed divider. The driver sets the most suitable fan divisor
|
||
|
|
itself; specifically, it doubles the divider value each time a fan speed reading
|
||
|
|
returns an invalid value. Some fans might not be present because they share pins
|
||
|
|
with other functions.
|
||
|
|
|
||
|
|
Voltage sensors (also known as IN sensors) report their values in millivolts.
|
||
|
|
An alarm is triggered if the voltage has crossed a programmable minimum
|
||
|
|
or maximum limit.
|
||
|
|
|
||
|
|
The driver supports automatic fan control mode known as Thermal Cruise.
|
||
|
|
In this mode, the chip attempts to keep the measured temperature in a
|
||
|
|
predefined temperature range. If the temperature goes out of range, fan
|
||
|
|
is driven slower/faster to reach the predefined range again.
|
||
|
|
|
||
|
|
The mode works for fan1-fan5.
|
||
|
|
|
||
|
|
Usage Notes
|
||
|
|
-----------
|
||
|
|
|
||
|
|
On various ASUS boards with NCT6776F, it appears that CPUTIN is not really
|
||
|
|
connected to anything and floats, or that it is connected to some non-standard
|
||
|
|
temperature measurement device. As a result, the temperature reported on CPUTIN
|
||
|
|
will not reflect a usable value. It often reports unreasonably high
|
||
|
|
temperatures, and in some cases the reported temperature declines if the actual
|
||
|
|
temperature increases (similar to the raw PECI temperature value - see PECI
|
||
|
|
specification for details). CPUTIN should therefore be be ignored on ASUS
|
||
|
|
boards. The CPU temperature on ASUS boards is reported from PECI 0.
|