Kernel driver nct7802

Supported chips:

• Nuvoton NCT7802Y

  Prefix: ‘nct7802’

  Addresses scanned: I2C 0x28..0x2f

  Datasheet: Available from Nuvoton web site

Authors:

Guenter Roeck <linux@roeck-us.net>

Description

This driver implements support for the Nuvoton NCT7802Y hardware monitoring chip. NCT7802Y supports 6 temperature sensors, 5 voltage sensors, and 3 fan speed sensors.

Smart Fan™ speed control is available via pwmX_auto_point attributes.

Sysfs Attributes

Sysfs attributes unique to this chip are documented below. For common attributes, see Naming and data format standards for sysfs files.

step_up_time

Time interval between successive duty cycle increases when in Smart Fan mode. Specified in milliseconds and rounded to intervals of 100 in the range 100-25500.

step_down_time

Time interval between successive duty cycle decreases when in Smart Fan mode. Specified in milliseconds and rounded to intervals of 100 in the range 100-25500.

Tested Boards and BIOS Versions

The driver has been reported to work with the following boards and BIOS versions.

Board	BIOS version
Kontron COMe-bSC2	CHR2E934.001.GGO
Kontron COMe-bIP2	CCR2E212