projects / linux-block.git / blame
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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: http://pdfserv.maxim-ic.com/en/ds/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. |