forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
280 lines
8.4 KiB
280 lines
8.4 KiB
Kernel driver NCT6775 |
|
===================== |
|
|
|
.. note:: |
|
|
|
This driver supersedes the NCT6775F and NCT6776F support in the W83627EHF |
|
driver. |
|
|
|
Supported chips: |
|
|
|
* Nuvoton NCT6102D/NCT6104D/NCT6106D |
|
|
|
Prefix: 'nct6106' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from the Nuvoton web site |
|
|
|
* Nuvoton NCT5572D/NCT6771F/NCT6772F/NCT6775F/W83677HG-I |
|
|
|
Prefix: 'nct6775' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
* Nuvoton NCT5573D/NCT5577D/NCT6776D/NCT6776F |
|
|
|
Prefix: 'nct6776' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
* Nuvoton NCT5532D/NCT6779D |
|
|
|
Prefix: 'nct6779' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
* Nuvoton NCT6791D |
|
|
|
Prefix: 'nct6791' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
* Nuvoton NCT6792D |
|
|
|
Prefix: 'nct6792' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
* Nuvoton NCT6793D |
|
|
|
Prefix: 'nct6793' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
* Nuvoton NCT6795D |
|
|
|
Prefix: 'nct6795' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
* Nuvoton NCT6796D |
|
|
|
Prefix: 'nct6796' |
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers |
|
|
|
Datasheet: Available from Nuvoton upon request |
|
|
|
|
|
|
|
Authors: |
|
|
|
Guenter Roeck <[email protected]> |
|
|
|
Description |
|
----------- |
|
|
|
This driver implements support for the Nuvoton NCT6775F, NCT6776F, and NCT6779D |
|
and compatible 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 increases the divider value each time a fan speed |
|
reading returns an invalid value, and it reduces it if the fan speed reading |
|
is lower than optimal. 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. |
|
|
|
sysfs attributes |
|
---------------- |
|
|
|
pwm[1-7] |
|
- this file stores PWM duty cycle or DC value (fan speed) in range: |
|
|
|
0 (lowest speed) to 255 (full) |
|
|
|
pwm[1-7]_enable |
|
- this file controls mode of fan/temperature control: |
|
|
|
* 0 Fan control disabled (fans set to maximum speed) |
|
* 1 Manual mode, write to pwm[0-5] any value 0-255 |
|
* 2 "Thermal Cruise" mode |
|
* 3 "Fan Speed Cruise" mode |
|
* 4 "Smart Fan III" mode (NCT6775F only) |
|
* 5 "Smart Fan IV" mode |
|
|
|
pwm[1-7]_mode |
|
- controls if output is PWM or DC level |
|
|
|
* 0 DC output |
|
* 1 PWM output |
|
|
|
Common fan control attributes |
|
----------------------------- |
|
|
|
pwm[1-7]_temp_sel |
|
Temperature source. Value is temperature sensor index. |
|
For example, select '1' for temp1_input. |
|
|
|
pwm[1-7]_weight_temp_sel |
|
Secondary temperature source. Value is temperature |
|
sensor index. For example, select '1' for temp1_input. |
|
Set to 0 to disable secondary temperature control. |
|
|
|
If secondary temperature functionality is enabled, it is controlled with the |
|
following attributes. |
|
|
|
pwm[1-7]_weight_duty_step |
|
Duty step size. |
|
|
|
pwm[1-7]_weight_temp_step |
|
Temperature step size. With each step over |
|
temp_step_base, the value of weight_duty_step is added |
|
to the current pwm value. |
|
|
|
pwm[1-7]_weight_temp_step_base |
|
Temperature at which secondary temperature control kicks |
|
in. |
|
|
|
pwm[1-7]_weight_temp_step_tol |
|
Temperature step tolerance. |
|
|
|
Thermal Cruise mode (2) |
|
----------------------- |
|
|
|
If the temperature is in the range defined by: |
|
|
|
pwm[1-7]_target_temp |
|
Target temperature, unit millidegree Celsius |
|
(range 0 - 127000) |
|
|
|
pwm[1-7]_temp_tolerance |
|
Target temperature tolerance, unit millidegree Celsius |
|
|
|
There are no changes to fan speed. Once the temperature leaves the interval, fan |
|
speed increases (if temperature is higher that desired) or decreases (if |
|
temperature is lower than desired), using the following limits and time |
|
intervals. |
|
|
|
pwm[1-7]_start |
|
fan pwm start value (range 1 - 255), to start fan |
|
when the temperature is above defined range. |
|
|
|
pwm[1-7]_floor |
|
lowest fan pwm (range 0 - 255) if temperature is below |
|
the defined range. If set to 0, the fan is expected to |
|
stop if the temperature is below the defined range. |
|
|
|
pwm[1-7]_step_up_time |
|
milliseconds before fan speed is increased |
|
|
|
pwm[1-7]_step_down_time |
|
milliseconds before fan speed is decreased |
|
|
|
pwm[1-7]_stop_time |
|
how many milliseconds must elapse to switch |
|
corresponding fan off (when the temperature was below |
|
defined range). |
|
|
|
Speed Cruise mode (3) |
|
--------------------- |
|
|
|
This modes tries to keep the fan speed constant. |
|
|
|
fan[1-7]_target |
|
Target fan speed |
|
|
|
fan[1-7]_tolerance |
|
Target speed tolerance |
|
|
|
|
|
Untested; use at your own risk. |
|
|
|
Smart Fan IV mode (5) |
|
--------------------- |
|
|
|
This mode offers multiple slopes to control the fan speed. The slopes can be |
|
controlled by setting the pwm and temperature attributes. When the temperature |
|
rises, the chip will calculate the DC/PWM output based on the current slope. |
|
There are up to seven data points depending on the chip type. Subsequent data |
|
points should be set to higher temperatures and higher pwm values to achieve |
|
higher fan speeds with increasing temperature. The last data point reflects |
|
critical temperature mode, in which the fans should run at full speed. |
|
|
|
pwm[1-7]_auto_point[1-7]_pwm |
|
pwm value to be set if temperature reaches matching |
|
temperature range. |
|
|
|
pwm[1-7]_auto_point[1-7]_temp |
|
Temperature over which the matching pwm is enabled. |
|
|
|
pwm[1-7]_temp_tolerance |
|
Temperature tolerance, unit millidegree Celsius |
|
|
|
pwm[1-7]_crit_temp_tolerance |
|
Temperature tolerance for critical temperature, |
|
unit millidegree Celsius |
|
|
|
pwm[1-7]_step_up_time |
|
milliseconds before fan speed is increased |
|
|
|
pwm[1-7]_step_down_time |
|
milliseconds before fan speed is decreased |
|
|
|
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 ignored on ASUS |
|
boards. The CPU temperature on ASUS boards is reported from PECI 0.
|
|
|