hwmon: (w83627ehf) Add support for Nuvoton NCT6775F and NCT6776F

    Prefix: 'w83667hg'

    Addresses scanned: ISA address retrieved from Super I/O registers

    Datasheet: Available from Nuvoton upon request

  * 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

Authors:

        Jean Delvare <khali@linux-fr.org>

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This driver implements support for the Winbond W83627EHF, W83627EHG,

W83627DHG, W83627DHG-P, W83667HG and W83667HG-B super I/O chips.

We will refer to them collectively as Winbond chips.

The chips implement three temperature sensors (up to four for 667HG-B),

five fan rotation speed sensors, ten analog voltage sensors (only nine for the

627DHG), one VID (6 pins for the 627EHF/EHG, 8 pins for the 627DHG and 667HG),

alarms with beep warnings (control unimplemented), and some automatic fan

regulation strategies (plus manual fan control mode).

The temperature sensor sources on W82677HG-B are configurable. temp4 is only

reported if its temperature source differs from the temperature sources of the

other three temperature sensors. The configured source for each of the

temperature sensors is reported in tempX_label.

W83627DHG, W83627DHG-P, W83667HG, W83667HG-B, W83667HG-I (NCT6775F),

and NCT6776F super I/O chips. We will refer to them collectively as

Winbond chips.

The chips implement three temperature sensors (up to four for 667HG-B, and nine

for NCT6775F and NCT6776F), five fan rotation speed sensors, ten analog voltage

sensors (only nine for the 627DHG), one VID (6 pins for the 627EHF/EHG, 8 pins

for the 627DHG and 667HG), alarms with beep warnings (control unimplemented),

and some automatic fan regulation strategies (plus manual fan control mode).

The temperature sensor sources on W82677HG-B, NCT6775F, and NCT6776F are

configurable. temp4 and higher attributes are only reported if its temperature

source differs from the temperature sources of the already reported temperature

sensors. The configured source for each of the temperature sensors is provided

in tempX_label.

Temperatures are measured in degrees Celsius and measurement resolution is 1

degC for temp1 and temp4, 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.

degC for temp1 and and 0.5 degC for temp2 and temp3. For temp4 and higher,

resolution is 1 degC for W83667HG-B and 0.0 degC for NCT6775F and NCT6776F.

An alarm is triggered when the temperature gets higher than high limit;

it stays on until the temperature falls below the hysteresis value.

Alarms are only supported for temp1, temp2, and temp3.

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

name - this is a standard hwmon device entry. For the W83627EHF and W83627EHG,

       it is set to "w83627ehf", for the W83627DHG it is set to "w83627dhg",

       and for the W83667HG it is set to "w83667hg".

       for the W83667HG and W83667HG-B it is set to "w83667hg", for NCT6775F it

       is set to "nct6775", and for NCT6776F it is set to "nct6776".

pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range:

	   0 (stop) to 255 (full)

	* 2 "Thermal Cruise" mode

	* 3 "Fan Speed Cruise" mode

	* 4 "Smart Fan III" mode

	* 5 "Smart Fan IV" mode

	SmartFan III mode is not supported on NCT6776F.

	SmartFan IV mode is configurable only if it was configured at system

	startup, and is only supported for W83677HG-B, NCT6775F, and NCT6776F.

	SmartFan IV operational parameters can not be configured at this time,

	and the various pwm attributes are not used in SmartFan IV mode.

	The attributes can be written to, which is useful if you plan to

	configure the system for a different pwm mode. However, the information

	returned when reading pwm attributes is unrelated to SmartFan IV

	operation.

pwm[1-4]_mode - controls if output is PWM or DC level

        * 0 DC output (0 - 12v)