| .. SPDX-License-Identifier: GPL-2.0-or-later |
| |
| Kernel driver max6620 |
| ===================== |
| |
| Supported chips: |
| |
| Maxim MAX6620 |
| |
| Prefix: 'max6620' |
| |
| Addresses scanned: none |
| |
| Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max6620.pdf |
| |
| 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. |
