Documentation/hwmon/w83792d.rst

Source file repositories/reference/linux-study-clean/Documentation/hwmon/w83792d.rst

File Facts

System
Linux kernel
Corpus path
Documentation/hwmon/w83792d.rst
Extension
.rst
Size
6296 bytes
Lines
200
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

Kernel driver w83792d
=====================

Supported chips:

  * Winbond W83792D

    Prefix: 'w83792d'

    Addresses scanned: I2C 0x2c - 0x2f

    Datasheet: http://www.winbond.com.tw

Author: Shane Huang (Winbond)
Updated: Roger Lucas


Module Parameters
-----------------

* init int
    (default 1)

    Use 'init=0' to bypass initializing the chip.
    Try this if your computer crashes when you load the module.

* force_subclients=bus,caddr,saddr,saddr
    This is used to force the i2c addresses for subclients of
    a certain chip. Example usage is `force_subclients=0,0x2f,0x4a,0x4b`
    to force the subclients of chip 0x2f on bus 0 to i2c addresses
    0x4a and 0x4b.


Description
-----------

This driver implements support for the Winbond W83792AD/D.

Detection of the chip can sometimes be foiled because it can be in an
internal state that allows no clean access (Bank with ID register is not
currently selected). If you know the address of the chip, use a 'force'
parameter; this will put it into a more well-behaved state first.

The driver implements three temperature sensors, seven fan rotation speed
sensors, nine voltage sensors, and two automatic fan regulation
strategies called: Smart Fan I (Thermal Cruise mode) and Smart Fan II.

The driver also implements up to seven fan control outputs: pwm1-7.  Pwm1-7
can be configured to PWM output or Analogue DC output via their associated
pwmX_mode. Outputs pwm4 through pwm7 may or may not be present depending on
how the W83792AD/D was configured by the BIOS.

Automatic fan control mode is possible only for fan1-fan3.

For all pwmX outputs, a value of 0 means minimum fan speed and a value of
255 means maximum fan speed.

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 the Overtemperature Shutdown value; 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.

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.

Annotation

Implementation Notes