1 .. SPDX-License-Identifier: GPL-2.0-or-later 2 3 Kernel driver max6620 4 ===================== 5 6 Supported chips: 7 8 Maxim MAX6620 9 10 Prefix: 'max6620' 11 12 Addresses scanned: none 13 14 Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/max6620.pdf 15 16 Authors: 17 - L\. Grunenberg <contact@lgrunenberg.de> 18 - Cumulus Networks <support@cumulusnetworks.com> 19 - Shuotian Cheng <shuche@microsoft.com> 20 - Arun Saravanan Balachandran <Arun_Saravanan_Balac@dell.com> 21 22 Description 23 ----------- 24 25 This driver implements support for Maxim MAX6620 fan controller. 26 27 The driver configures the fan controller in RPM mode. To give the readings more 28 range or accuracy, the desired value can be set by a programmable register 29 (1, 2, 4, 8, 16 or 32). Set higher values for larger speeds. 30 31 The driver provides the following sensor access in sysfs: 32 33 ================ ======= ===================================================== 34 fan[1-4]_alarm ro Fan alarm. 35 fan[1-4]_div rw Sets the nominal RPM range of the fan. Valid values 36 are 1, 2, 4, 8, 16 and 32. 37 fan[1-4]_input ro Fan speed in RPM. 38 fan[1-4]_target rw Desired fan speed in RPM. 39 ================ ======= ===================================================== 40 41 Usage notes 42 ----------- 43 44 This driver does not auto-detect devices. You will have to instantiate the 45 devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for 46 details.
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