2021-09-13 06:40:15 -07:00
|
|
|
.. SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
|
|
|
|
|
|
Kernel driver max6620
|
|
|
|
|
=====================
|
|
|
|
|
|
|
|
|
|
Supported chips:
|
|
|
|
|
|
|
|
|
|
Maxim MAX6620
|
|
|
|
|
|
|
|
|
|
Prefix: 'max6620'
|
|
|
|
|
|
|
|
|
|
Addresses scanned: none
|
|
|
|
|
|
2024-02-16 00:52:12 -07:00
|
|
|
Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max6620.pdf
|
2021-09-13 06:40:15 -07:00
|
|
|
|
|
|
|
|
Authors:
|
|
|
|
|
- L\. Grunenberg <contact@lgrunenberg.de>
|
|
|
|
|
- Cumulus Networks <support@cumulusnetworks.com>
|
|
|
|
|
- Shuotian Cheng <shuche@microsoft.com>
|
|
|
|
|
- Arun Saravanan Balachandran <Arun_Saravanan_Balac@dell.com>
|
|
|
|
|
|
|
|
|
|
Description
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
This driver implements support for Maxim MAX6620 fan controller.
|
|
|
|
|
|
|
|
|
|
The driver configures the fan controller in RPM mode. To give the readings more
|
|
|
|
|
range or accuracy, the desired value can be set by a programmable register
|
|
|
|
|
(1, 2, 4, 8, 16 or 32). Set higher values for larger speeds.
|
|
|
|
|
|
|
|
|
|
The driver provides the following sensor access in sysfs:
|
|
|
|
|
|
|
|
|
|
================ ======= =====================================================
|
|
|
|
|
fan[1-4]_alarm ro Fan alarm.
|
|
|
|
|
fan[1-4]_div rw Sets the nominal RPM range of the fan. Valid values
|
|
|
|
|
are 1, 2, 4, 8, 16 and 32.
|
|
|
|
|
fan[1-4]_input ro Fan speed in RPM.
|
|
|
|
|
fan[1-4]_target rw Desired fan speed in RPM.
|
|
|
|
|
================ ======= =====================================================
|
|
|
|
|
|
|
|
|
|
Usage notes
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
This driver does not auto-detect devices. You will have to instantiate the
|
|
|
|
|
devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
|
|
|
|
|
details.
|
