Commit | Line | Data |
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61db011d RM |
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 | |
46bed4df | 48 | Temp1-4 have 2 possible types. It can be read from (and written to) |
61db011d | 49 | temp[1-4]_type. |
61db011d RM |
50 | - If the value is 3, it starts monitoring using a remote termal diode |
51 | (default). | |
61db011d RM |
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 | |
46bed4df | 55 | temp[5-6]_type is 4). |
61db011d RM |
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 | |
a516dc3e | 95 | by writing 0 to the sysfs file "intrusion0_alarm". |
61db011d RM |
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. |