Documentation/hwmon/max1668.rst

Source file repositories/reference/linux-study-clean/Documentation/hwmon/max1668.rst

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Linux kernel
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Documentation/hwmon/max1668.rst
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.rst
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71
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.

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Annotated Snippet

Kernel driver max1668
=====================

Supported chips:

  * Maxim MAX1668, MAX1805 and MAX1989

    Prefix: 'max1668'

    Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e

    Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/MAX1668-MAX1989.pdf

Author:

    David George <david.george@ska.ac.za>

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

This driver implements support for the Maxim MAX1668, MAX1805 and MAX1989
chips.

The three devices are very similar, but the MAX1805 has a reduced feature
set; only two remote temperature inputs vs the four available on the other
two ICs.

The driver is able to distinguish between the devices and creates sysfs
entries as follows:

- MAX1805, MAX1668 and MAX1989:

=============== == ============================================================
temp1_input     ro local (ambient) temperature
temp1_max       rw local temperature maximum threshold for alarm
temp1_max_alarm ro local temperature maximum threshold alarm
temp1_min       rw local temperature minimum threshold for alarm
temp1_min_alarm ro local temperature minimum threshold alarm
temp2_input     ro remote temperature 1
temp2_max       rw remote temperature 1 maximum threshold for alarm
temp2_max_alarm ro remote temperature 1 maximum threshold alarm
temp2_min       rw remote temperature 1 minimum threshold for alarm
temp2_min_alarm ro remote temperature 1 minimum threshold alarm
temp3_input     ro remote temperature 2
temp3_max       rw remote temperature 2 maximum threshold for alarm
temp3_max_alarm ro remote temperature 2 maximum threshold alarm
temp3_min       rw remote temperature 2 minimum threshold for alarm
temp3_min_alarm ro remote temperature 2 minimum threshold alarm
=============== == ============================================================

- MAX1668 and MAX1989 only:

=============== == ============================================================
temp4_input     ro remote temperature 3
temp4_max       rw remote temperature 3 maximum threshold for alarm
temp4_max_alarm ro remote temperature 3 maximum threshold alarm
temp4_min       rw remote temperature 3 minimum threshold for alarm
temp4_min_alarm ro remote temperature 3 minimum threshold alarm
temp5_input     ro remote temperature 4
temp5_max       rw remote temperature 4 maximum threshold for alarm
temp5_max_alarm ro remote temperature 4 maximum threshold alarm
temp5_min       rw remote temperature 4 minimum threshold for alarm
temp5_min_alarm ro remote temperature 4 minimum threshold alarm
=============== == ============================================================

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

* read_only: int
  Set to non-zero if you wish to prevent write access to alarm thresholds.

Annotation

Implementation Notes