About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / hwmon / amc6821




Custom Search

Based on kernel version 3.16. Page generated on 2014-08-06 21:39 EST.

1	Kernel driver amc6821
2	=====================
3	
4	Supported chips:
5		Texas Instruments AMC6821
6		Prefix: 'amc6821'
7		Addresses scanned: 0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 0x4c, 0x4d, 0x4e
8		Datasheet: http://focus.ti.com/docs/prod/folders/print/amc6821.html
9	
10	Authors:
11		Tomaz Mertelj <tomaz.mertelj@guest.arnes.si>
12	
13	
14	Description
15	-----------
16	
17	This driver implements support for the Texas Instruments amc6821 chip.
18	The chip has one on-chip and one remote temperature sensor and one pwm fan
19	regulator.
20	The pwm can be controlled either from software or automatically.
21	
22	The driver provides the following sensor accesses in sysfs:
23	
24	temp1_input		ro	on-chip temperature
25	temp1_min		rw	"
26	temp1_max		rw	"
27	temp1_crit	 	rw	"
28	temp1_min_alarm		ro	"
29	temp1_max_alarm		ro	"
30	temp1_crit_alarm	ro	"
31	
32	temp2_input		ro	remote temperature
33	temp2_min		rw	"
34	temp2_max		rw	"
35	temp2_crit	 	rw	"
36	temp2_min_alarm		ro	"
37	temp2_max_alarm		ro	"
38	temp2_crit_alarm	ro	"
39	temp2_fault		ro	"
40	
41	fan1_input	 	ro	tachometer speed
42	fan1_min		rw	"
43	fan1_max		rw	"
44	fan1_fault	 	ro	"
45	fan1_div		rw	Fan divisor can be either 2 or 4.
46	
47	pwm1			rw	pwm1
48	pwm1_enable		rw	regulator mode, 1=open loop, 2=fan controlled
49					by remote temperature, 3=fan controlled by
50					combination of the on-chip temperature and
51					remote-sensor temperature,
52	pwm1_auto_channels_temp ro	1 if pwm_enable==2, 3 if pwm_enable==3
53	pwm1_auto_point1_pwm	ro	Hardwired to 0, shared for both
54					temperature channels.
55	pwm1_auto_point2_pwm	rw	This value is shared for both temperature
56					channels.
57	pwm1_auto_point3_pwm	rw	Hardwired to 255, shared for both
58					temperature channels.
59	
60	temp1_auto_point1_temp	ro	Hardwired to temp2_auto_point1_temp
61					which is rw. Below this temperature fan stops.
62	temp1_auto_point2_temp	rw	The low-temperature limit of the proportional
63					range. Below this temperature
64					pwm1 = pwm1_auto_point2_pwm. It can go from
65					0 degree C to 124 degree C in steps of
66					4 degree C. Read it out after writing to get
67					the actual value.
68	temp1_auto_point3_temp	rw	Above this temperature fan runs at maximum
69					speed. It can go from temp1_auto_point2_temp.
70					It can only have certain discrete values
71					which depend on temp1_auto_point2_temp and
72					pwm1_auto_point2_pwm. Read it out after
73					writing to get the actual value.
74	
75	temp2_auto_point1_temp	rw	Must be between 0 degree C and 63 degree C and
76					it defines the passive cooling temperature.
77					Below this temperature the fan stops in
78					the closed loop mode.
79	temp2_auto_point2_temp	rw	The low-temperature limit of the proportional
80					range. Below this temperature
81					pwm1 = pwm1_auto_point2_pwm. It can go from
82					0 degree C to 124 degree C in steps
83					of 4 degree C.
84	
85	temp2_auto_point3_temp	rw	Above this temperature fan runs at maximum
86					speed. It can only have certain discrete
87					values which depend on temp2_auto_point2_temp
88					and pwm1_auto_point2_pwm. Read it out after
89					writing to get actual value.
90	
91	
92	Module parameters
93	-----------------
94	
95	If your board has a BIOS that initializes the amc6821 correctly, you should
96	load the module with: init=0.
97	
98	If your board BIOS doesn't initialize the chip, or you want
99	different settings, you can set the following parameters:
100	init=1,
101	pwminv: 0 default pwm output, 1 inverts pwm output.
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.