About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / hwmon / max6650


Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.

1	Kernel driver max6650
2	=====================
3	
4	Supported chips:
5	  * Maxim MAX6650
6	    Prefix: 'max6650'
7	    Addresses scanned: none
8	    Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
9	  * Maxim MAX6651
10	    Prefix: 'max6651'
11	    Addresses scanned: none
12	    Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
13	
14	Authors:
15	    Hans J. Koch <hjk@hansjkoch.de>
16	    John Morris <john.morris@spirentcom.com>
17	    Claus Gindhart <claus.gindhart@kontron.com>
18	
19	Description
20	-----------
21	
22	This driver implements support for the Maxim MAX6650 and MAX6651.
23	
24	The 2 devices are very similar, but the MAX6550 has a reduced feature
25	set, e.g. only one fan-input, instead of 4 for the MAX6651.
26	
27	The driver is not able to distinguish between the 2 devices.
28	
29	The driver provides the following sensor accesses in sysfs:
30	
31	fan1_input	ro	fan tachometer speed in RPM
32	fan2_input	ro	"
33	fan3_input	ro	"
34	fan4_input	ro	"
35	fan1_target	rw	desired fan speed in RPM (closed loop mode only)
36	pwm1_enable	rw	regulator mode, 0=full on, 1=open loop, 2=closed loop
37				3=off
38	pwm1		rw	relative speed (0-255), 255=max. speed.
39				Used in open loop mode only.
40	fan1_div	rw	sets the speed range the inputs can handle. Legal
41				values are 1, 2, 4, and 8. Use lower values for
42				faster fans.
43	
44	Usage notes
45	-----------
46	
47	This driver does not auto-detect devices. You will have to instantiate the
48	devices explicitly. Please see Documentation/i2c/instantiating-devices for
49	details.
50	
51	Module parameters
52	-----------------
53	
54	If your board has a BIOS that initializes the MAX6650/6651 correctly, you can
55	simply load your module without parameters. It won't touch the configuration
56	registers then. If your board BIOS doesn't initialize the chip, or you want
57	different settings, you can set the following parameters:
58	
59	voltage_12V: 5=5V fan, 12=12V fan, 0=don't change
60	prescaler: Possible values are 1,2,4,8,16, or 0 for don't change
61	clock: The clock frequency in Hz of the chip the driver should assume [254000]
62	
63	Please have a look at the MAX6650/6651 data sheet and make sure that you fully
64	understand the meaning of these parameters before you attempt to change them.
Hide Line Numbers


About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog