forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
2.3 KiB
74 lines
2.3 KiB
Kernel driver max6650 |
|
===================== |
|
|
|
Supported chips: |
|
|
|
* Maxim MAX6650 |
|
|
|
Prefix: 'max6650' |
|
|
|
Addresses scanned: none |
|
|
|
Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf |
|
|
|
* Maxim MAX6651 |
|
|
|
Prefix: 'max6651' |
|
|
|
Addresses scanned: none |
|
|
|
Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf |
|
|
|
Authors: |
|
- Hans J. Koch <[email protected]> |
|
- John Morris <[email protected]> |
|
- Claus Gindhart <[email protected]> |
|
|
|
Description |
|
----------- |
|
|
|
This driver implements support for the Maxim MAX6650 and MAX6651. |
|
|
|
The 2 devices are very similar, but the MAX6550 has a reduced feature |
|
set, e.g. only one fan-input, instead of 4 for the MAX6651. |
|
|
|
The driver is not able to distinguish between the 2 devices. |
|
|
|
The driver provides the following sensor accesses in sysfs: |
|
|
|
=============== ======= ======================================================= |
|
fan1_input ro fan tachometer speed in RPM |
|
fan2_input ro " |
|
fan3_input ro " |
|
fan4_input ro " |
|
fan1_target rw desired fan speed in RPM (closed loop mode only) |
|
pwm1_enable rw regulator mode, 0=full on, 1=open loop, 2=closed loop |
|
3=off |
|
pwm1 rw relative speed (0-255), 255=max. speed. |
|
Used in open loop mode only. |
|
fan1_div rw sets the speed range the inputs can handle. Legal |
|
values are 1, 2, 4, and 8. Use lower values for |
|
faster fans. |
|
=============== ======= ======================================================= |
|
|
|
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. |
|
|
|
Module parameters |
|
----------------- |
|
|
|
If your board has a BIOS that initializes the MAX6650/6651 correctly, you can |
|
simply load your module without parameters. It won't touch the configuration |
|
registers then. If your board BIOS doesn't initialize the chip, or you want |
|
different settings, you can set the following parameters: |
|
|
|
voltage_12V: 5=5V fan, 12=12V fan, 0=don't change |
|
prescaler: Possible values are 1,2,4,8,16, or 0 for don't change |
|
clock: The clock frequency in Hz of the chip the driver should assume [254000] |
|
|
|
Please have a look at the MAX6650/6651 data sheet and make sure that you fully |
|
understand the meaning of these parameters before you attempt to change them.
|
|
|