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248 lines
8.4 KiB
248 lines
8.4 KiB
Kernel driver w83627ehf |
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======================= |
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Supported chips: |
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* Winbond W83627EHF/EHG (ISA access ONLY) |
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Prefix: 'w83627ehf' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: not available |
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* Winbond W83627DHG |
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Prefix: 'w83627dhg' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: not available |
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* Winbond W83627DHG-P |
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Prefix: 'w83627dhg' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: not available |
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* Winbond W83627UHG |
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Prefix: 'w83627uhg' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: available from www.nuvoton.com |
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* Winbond W83667HG |
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Prefix: 'w83667hg' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: not available |
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* Winbond W83667HG-B |
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Prefix: 'w83667hg' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: Available from Nuvoton upon request |
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* Nuvoton NCT6775F/W83667HG-I |
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Prefix: 'nct6775' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: Available from Nuvoton upon request |
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* Nuvoton NCT6776F |
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Prefix: 'nct6776' |
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Addresses scanned: ISA address retrieved from Super I/O registers |
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Datasheet: Available from Nuvoton upon request |
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Authors: |
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- Jean Delvare <[email protected]> |
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- Yuan Mu (Winbond) |
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- Rudolf Marek <[email protected]> |
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- David Hubbard <[email protected]> |
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- Gong Jun <[email protected]> |
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Description |
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----------- |
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This driver implements support for the Winbond W83627EHF, W83627EHG, |
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W83627DHG, W83627DHG-P, W83627UHG, W83667HG, W83667HG-B, W83667HG-I |
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(NCT6775F), and NCT6776F super I/O chips. We will refer to them collectively |
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as Winbond chips. |
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The chips implement 3 to 4 temperature sensors (9 for NCT6775F and NCT6776F), |
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2 to 5 fan rotation speed sensors, 8 to 10 analog voltage sensors, one VID |
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(except for 627UHG), alarms with beep warnings (control unimplemented), |
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and some automatic fan regulation strategies (plus manual fan control mode). |
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The temperature sensor sources on W82677HG-B, NCT6775F, and NCT6776F are |
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configurable. temp4 and higher attributes are only reported if its temperature |
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source differs from the temperature sources of the already reported temperature |
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sensors. The configured source for each of the temperature sensors is provided |
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in tempX_label. |
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Temperatures are measured in degrees Celsius and measurement resolution is 1 |
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degC for temp1 and 0.5 degC for temp2 and temp3. For temp4 and higher, |
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resolution is 1 degC for W83667HG-B and 0.0 degC for NCT6775F and NCT6776F. |
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An alarm is triggered when the temperature gets higher than high limit; |
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it stays on until the temperature falls below the hysteresis value. |
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Alarms are only supported for temp1, temp2, and temp3. |
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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. Fan |
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readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or |
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128) to give the readings more range or accuracy. The driver sets the most |
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suitable fan divisor itself. Some fans might not be present because they |
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share pins with other functions. |
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Voltage sensors (also known as IN sensors) report their values in millivolts. |
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An alarm is triggered if the voltage has crossed a programmable minimum |
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or maximum limit. |
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The driver supports automatic fan control mode known as Thermal Cruise. |
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In this mode, the chip attempts to keep the measured temperature in a |
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predefined temperature range. If the temperature goes out of range, fan |
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is driven slower/faster to reach the predefined range again. |
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The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as |
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follows:: |
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temp1 -> pwm1 |
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temp2 -> pwm2 |
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temp3 -> pwm3 (not on 627UHG) |
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prog -> pwm4 (not on 667HG and 667HG-B; the programmable setting is not |
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supported by the driver) |
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/sys files |
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---------- |
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name |
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this is a standard hwmon device entry, it contains the name of |
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the device (see the prefix in the list of supported devices at |
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the top of this file) |
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pwm[1-4] |
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this file stores PWM duty cycle or DC value (fan speed) in range: |
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0 (stop) to 255 (full) |
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pwm[1-4]_enable |
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this file controls mode of fan/temperature control: |
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* 1 Manual mode, write to pwm file any value 0-255 (full speed) |
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* 2 "Thermal Cruise" mode |
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* 3 "Fan Speed Cruise" mode |
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* 4 "Smart Fan III" mode |
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* 5 "Smart Fan IV" mode |
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SmartFan III mode is not supported on NCT6776F. |
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SmartFan IV mode is configurable only if it was configured at system |
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startup, and is only supported for W83677HG-B, NCT6775F, and NCT6776F. |
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SmartFan IV operational parameters can not be configured at this time, |
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and the various pwm attributes are not used in SmartFan IV mode. |
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The attributes can be written to, which is useful if you plan to |
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configure the system for a different pwm mode. However, the information |
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returned when reading pwm attributes is unrelated to SmartFan IV |
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operation. |
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pwm[1-4]_mode |
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controls if output is PWM or DC level |
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* 0 DC output (0 - 12v) |
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* 1 PWM output |
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Thermal Cruise mode |
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------------------- |
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If the temperature is in the range defined by: |
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pwm[1-4]_target |
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set target temperature, unit millidegree Celsius |
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(range 0 - 127000) |
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pwm[1-4]_tolerance |
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tolerance, unit millidegree Celsius (range 0 - 15000) |
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there are no changes to fan speed. Once the temperature leaves the interval, |
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fan speed increases (temp is higher) or decreases if lower than desired. |
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There are defined steps and times, but not exported by the driver yet. |
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pwm[1-4]_min_output |
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minimum fan speed (range 1 - 255), when the temperature |
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is below defined range. |
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pwm[1-4]_stop_time |
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how many milliseconds [ms] must elapse to switch |
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corresponding fan off. (when the temperature was below |
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defined range). |
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pwm[1-4]_start_output |
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minimum fan speed (range 1 - 255) when spinning up |
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pwm[1-4]_step_output |
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rate of fan speed change (1 - 255) |
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pwm[1-4]_stop_output |
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minimum fan speed (range 1 - 255) when spinning down |
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pwm[1-4]_max_output |
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maximum fan speed (range 1 - 255), when the temperature |
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is above defined range. |
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Note: last six functions are influenced by other control bits, not yet exported |
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by the driver, so a change might not have any effect. |
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Implementation Details |
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---------------------- |
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Future driver development should bear in mind that the following registers have |
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different functions on the 627EHF and the 627DHG. Some registers also have |
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different power-on default values, but BIOS should already be loading |
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appropriate defaults. Note that bank selection must be performed as is currently |
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done in the driver for all register addresses. |
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========================= ===================================================== |
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Register(s) Meaning |
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========================= ===================================================== |
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0x49 only on DHG, selects temperature source for AUX fan, |
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CPU fan0 |
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0x4a not completely documented for the EHF and the DHG |
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documentation assigns different behavior to bits 7 |
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and 6, including extending the temperature input |
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selection to SmartFan I, not just SmartFan III. |
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Testing on the EHF will reveal whether they are |
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compatible or not. |
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0x58 Chip ID: 0xa1=EHF 0xc1=DHG |
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0x5e only on DHG, has bits to enable "current mode" |
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temperature detection and critical temperature |
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protection |
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0x45b only on EHF, bit 3, vin4 alarm (EHF supports 10 |
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inputs, only 9 on DHG) |
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0x552 only on EHF, vin4 |
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0x558 only on EHF, vin4 high limit |
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0x559 only on EHF, vin4 low limit |
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0x6b only on DHG, SYS fan critical temperature |
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0x6c only on DHG, CPU fan0 critical temperature |
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0x6d only on DHG, AUX fan critical temperature |
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0x6e only on DHG, CPU fan1 critical temperature |
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0x50-0x55 and 0x650-0x657 marked as: |
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- "Test Register" for the EHF |
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- "Reserved Register" for the DHG |
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========================= ===================================================== |
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The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and |
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the ICH8 southbridge gets that data via PECI from the DHG, so that the |
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southbridge drives the fans. And the DHG supports SST, a one-wire serial bus. |
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The DHG-P has an additional automatic fan speed control mode named Smart Fan |
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(TM) III+. This mode is not yet supported by the driver.
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