|
|
|
|
Kernel driver w83627ehf
|
|
|
|
|
=======================
|
|
|
|
|
|
|
|
|
|
Supported chips:
|
|
|
|
|
* Winbond W83627EHF/EHG (ISA access ONLY)
|
|
|
|
|
Prefix: 'w83627ehf'
|
|
|
|
|
Addresses scanned: ISA address retrieved from Super I/O registers
|
|
|
|
|
Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf
|
|
|
|
|
|
|
|
|
|
Authors:
|
|
|
|
|
Jean Delvare <khali@linux-fr.org>
|
|
|
|
|
Yuan Mu (Winbond)
|
|
|
|
|
Rudolf Marek <r.marek@sh.cvut.cz>
|
|
|
|
|
|
|
|
|
|
Description
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
This driver implements support for the Winbond W83627EHF and W83627EHG
|
|
|
|
|
super I/O chips. We will refer to them collectively as Winbond chips.
|
|
|
|
|
|
|
|
|
|
The chips implement three temperature sensors, five fan rotation
|
|
|
|
|
speed sensors, ten analog voltage sensors, alarms with beep warnings (control
|
|
|
|
|
unimplemented), and some automatic fan regulation strategies (plus manual
|
|
|
|
|
fan control mode).
|
|
|
|
|
|
|
|
|
|
Temperatures are measured in degrees Celsius and measurement resolution is 1
|
|
|
|
|
degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when
|
|
|
|
|
the temperature gets higher than high limit; it stays on until the temperature
|
|
|
|
|
falls below the Hysteresis value.
|
|
|
|
|
|
|
|
|
|
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, 8, 16, 32, 64 or
|
|
|
|
|
128) to give the readings more range or accuracy. The driver sets the most
|
|
|
|
|
suitable fan divisor itself. 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-fan4. Mapping of temperatures to pwm outputs is as
|
|
|
|
|
follows:
|
|
|
|
|
|
|
|
|
|
temp1 -> pwm1
|
|
|
|
|
temp2 -> pwm2
|
|
|
|
|
temp3 -> pwm3
|
|
|
|
|
prog -> pwm4 (the programmable setting is not supported by the driver)
|
|
|
|
|
|
|
|
|
|
/sys files
|
|
|
|
|
----------
|
|
|
|
|
|
|
|
|
|
pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range:
|
|
|
|
|
0 (stop) to 255 (full)
|
|
|
|
|
|
|
|
|
|
pwm[1-4]_enable - this file controls mode of fan/temperature control:
|
|
|
|
|
* 1 Manual Mode, write to pwm file any value 0-255 (full speed)
|
|
|
|
|
* 2 Thermal Cruise
|
|
|
|
|
|
|
|
|
|
Thermal Cruise mode
|
|
|
|
|
-------------------
|
|
|
|
|
|
|
|
|
|
If the temperature is in the range defined by:
|
|
|
|
|
|
|
|
|
|
pwm[1-4]_target - set target temperature, unit millidegree Celcius
|
|
|
|
|
(range 0 - 127000)
|
|
|
|
|
pwm[1-4]_tolerance - tolerance, unit millidegree Celcius (range 0 - 15000)
|
|
|
|
|
|
|
|
|
|
there are no changes to fan speed. Once the temperature leaves the interval,
|
|
|
|
|
fan speed increases (temp is higher) or decreases if lower than desired.
|
|
|
|
|
There are defined steps and times, but not exported by the driver yet.
|
|
|
|
|
|
|
|
|
|
pwm[1-4]_min_output - minimum fan speed (range 1 - 255), when the temperature
|
|
|
|
|
is below defined range.
|
|
|
|
|
pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch
|
|
|
|
|
corresponding fan off. (when the temperature was below
|
|
|
|
|
defined range).
|
|
|
|
|
|
|
|
|
|
Note: last two functions are influenced by other control bits, not yet exported
|
|
|
|
|
by the driver, so a change might not have any effect.
|
