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Based on kernel version 3.15.4. Page generated on 2014-07-07 09:03 EST.

1	Kernel driver w83793
2	====================
3	
4	Supported chips:
5	  * Winbond W83793G/W83793R
6	    Prefix: 'w83793'
7	    Addresses scanned: I2C 0x2c - 0x2f
8	    Datasheet: Still not published
9	
10	Authors:
11	    Yuan Mu (Winbond Electronics)
12	    Rudolf Marek <r.marek@assembler.cz>
13	
14	
15	Module parameters
16	-----------------
17	
18	* reset int
19	  (default 0)
20	  This parameter is not recommended, it will lose motherboard specific
21	  settings. Use 'reset=1' to reset the chip when loading this module.
22	
23	* force_subclients=bus,caddr,saddr1,saddr2
24	  This is used to force the i2c addresses for subclients of
25	  a certain chip. Typical usage is `force_subclients=0,0x2f,0x4a,0x4b'
26	  to force the subclients of chip 0x2f on bus 0 to i2c addresses
27	  0x4a and 0x4b.
28	
29	
30	Description
31	-----------
32	
33	This driver implements support for Winbond W83793G/W83793R chips.
34	
35	* Exported features
36	  This driver exports 10 voltage sensors, up to 12 fan tachometer inputs,
37	  6 remote temperatures, up to 8 sets of PWM fan controls, SmartFan
38	  (automatic fan speed control) on all temperature/PWM combinations, 2
39	  sets of 6-pin CPU VID input.
40	
41	* Sensor resolutions
42	  If your motherboard maker used the reference design, the resolution of
43	  voltage0-2 is 2mV, resolution of voltage3/4/5 is 16mV, 8mV for voltage6,
44	  24mV for voltage7/8. Temp1-4 have a 0.25 degree Celsius resolution,
45	  temp5-6 have a 1 degree Celsiis resolution.
46	
47	* Temperature sensor types
48	  Temp1-4 have 2 possible types. It can be read from (and written to)
49	  temp[1-4]_type.
50	  - If the value is 3, it starts monitoring using a remote termal diode
51	    (default).
52	  - If the value is 6, it starts monitoring using the temperature sensor
53	    in Intel CPU and get result by PECI.
54	  Temp5-6 can be connected to external thermistors (value of
55	  temp[5-6]_type is 4).
56	
57	* Alarm mechanism
58	  For voltage sensors, an alarm triggers if the measured value is below
59	  the low voltage limit or over the high voltage limit.
60	  For temperature sensors, an alarm triggers if the measured value goes
61	  above the high temperature limit, and wears off only after the measured
62	  value drops below the hysteresis value.
63	  For fan sensors, an alarm triggers if the measured value is below the
64	  low speed limit.
65	
66	* SmartFan/PWM control
67	  If you want to set a pwm fan to manual mode, you just need to make sure it
68	  is not controlled by any temp channel, for example, you want to set fan1
69	  to manual mode, you need to check the value of temp[1-6]_fan_map, make
70	  sure bit 0 is cleared in the 6 values. And then set the pwm1 value to
71	  control the fan.
72	
73	  Each temperature channel can control all the 8 PWM outputs (by setting the
74	  corresponding bit in tempX_fan_map), you can set the temperature channel
75	  mode using temp[1-6]_pwm_enable, 2 is Thermal Cruise mode and 3
76	  is the SmartFanII mode. Temperature channels will try to speed up or
77	  slow down all controlled fans, this means one fan can receive different
78	  PWM value requests from different temperature channels, but the chip
79	  will always pick the safest (max) PWM value for each fan.
80	
81	  In Thermal Cruise mode, the chip attempts to keep the temperature at a
82	  predefined value, within a tolerance margin. So if tempX_input >
83	  thermal_cruiseX + toleranceX, the chip will increase the PWM value,
84	  if tempX_input < thermal_cruiseX - toleranceX, the chip will decrease
85	  the PWM value. If the temperature is within the tolerance range, the PWM
86	  value is left unchanged.
87	
88	  SmartFanII works differently, you have to define up to 7 PWM, temperature
89	  trip points, defining a PWM/temperature curve which the chip will follow.
90	  While not fundamentally different from the Thermal Cruise mode, the
91	  implementation is quite different, giving you a finer-grained control.
92	
93	* Chassis
94	  If the case open alarm triggers, it will stay in this state unless cleared
95	  by writing 0 to the sysfs file "intrusion0_alarm".
96	
97	* VID and VRM
98	  The VRM version is detected automatically, don't modify the it unless you
99	  *do* know the cpu VRM version and it's not properly detected.
100	
101	
102	Notes
103	-----
104	
105	  Only Fan1-5 and PWM1-3 are guaranteed to always exist, other fan inputs and
106	  PWM outputs may or may not exist depending on the chip pin configuration.
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