1 Kernel driver w83792d
2 =====================
3
4 Supported chips:
5
6 * Winbond W83792D
7
8 Prefix: 'w83792d'
9
10 Addresses scanned: I2C 0x2c - 0x2f
11
12 Datasheet: http://www.winbond.com.tw
13
14 Author: Shane Huang (Winbond)
15 Updated: Roger Lucas
16
17
18 Module Parameters
19 -----------------
20
21 * init int
22 (default 1)
23
24 Use 'init=0' to bypass initializing the ch
25 Try this if your computer crashes when you
26
27 * force_subclients=bus,caddr,saddr,saddr
28 This is used to force the i2c addresses fo
29 a certain chip. Example usage is `force_su
30 to force the subclients of chip 0x2f on bu
31 0x4a and 0x4b.
32
33
34 Description
35 -----------
36
37 This driver implements support for the Winbond
38
39 Detection of the chip can sometimes be foiled
40 internal state that allows no clean access (Ba
41 currently selected). If you know the address o
42 parameter; this will put it into a more well-b
43
44 The driver implements three temperature sensor
45 sensors, nine voltage sensors, and two automat
46 strategies called: Smart Fan I (Thermal Cruise
47
48 The driver also implements up to seven fan con
49 can be configured to PWM output or Analogue DC
50 pwmX_mode. Outputs pwm4 through pwm7 may or ma
51 how the W83792AD/D was configured by the BIOS.
52
53 Automatic fan control mode is possible only fo
54
55 For all pwmX outputs, a value of 0 means minim
56 255 means maximum fan speed.
57
58 Temperatures are measured in degrees Celsius a
59 degC for temp1 and 0.5 degC for temp2 and temp
60 the temperature gets higher than the Overtempe
61 on until the temperature falls below the Hyste
62
63 Fan rotation speeds are reported in RPM (rotat
64 triggered if the rotation speed has dropped be
65 readings can be divided by a programmable divi
66 128) to give the readings more range or accura
67
68 Voltage sensors (also known as IN sensors) rep
69 An alarm is triggered if the voltage has cross
70 or maximum limit.
71
72 Alarms are provided as output from "realtime s
73 are defined:
74
75 ==== ==========
76 bit alarm on
77 ==== ==========
78 0 in0
79 1 in1
80 2 temp1
81 3 temp2
82 4 temp3
83 5 fan1
84 6 fan2
85 7 fan3
86 8 in2
87 9 in3
88 10 in4
89 11 in5
90 12 in6
91 13 VID change
92 14 chassis
93 15 fan7
94 16 tart1
95 17 tart2
96 18 tart3
97 19 in7
98 20 in8
99 21 fan4
100 22 fan5
101 23 fan6
102 ==== ==========
103
104 Tart will be asserted while target temperature
105 of full speed rotation of corresponding fan.
106
107 In addition to the alarms described above, the
108 which triggers if your computer case is open (
109 to realtime alarms).
110
111 The chips only update values each 3 seconds; r
112 do no harm, but will return 'old' values.
113
114
115 W83792D PROBLEMS
116 ----------------
117 Known problems:
118 - This driver is only for Winbond W837
119 are also some motherboards with B ve
120 calculation method to in6-in7(measur
121 different between C and B version. C
122 by CR[0x49h].
123 - The function of vid and vrm has not
124 very familiar with them. Adding supp
125 - The function of chassis open detecti
126 - If you have ASUS server board and ch
127 need to upgrade to latest (or beta)
128 contact us.
129
130 Fan control
131 -----------
132
133 Manual mode
134 -----------
135
136 Works as expected. You just need to specify de
137 in appropriate pwm# file.
138
139 Thermal cruise
140 --------------
141
142 In this mode, W83792D provides the Smart Fan s
143 fan speed to keep the temperatures of CPU and
144 range. At first a wanted temperature and inter
145 via thermal_cruise# file. The tolerance# file
146 interval. The fan speed will be lowered as lon
147 remains below the thermal_cruise# +- tolerance
148 exceeds the high limit (T+tolerance), the fan
149 specific speed set by pwm# and automatically c
150 with the temperature varying. Three conditions
151
152 (1) If the temperature still exceeds the high
153 cycle will increase slowly.
154
155 (2) If the temperature goes below the high lim
156 limit (T-tolerance), the fan speed will be fix
157 the temperature is in the target range.
158
159 (3) If the temperature goes below the low limi
160 slowly to 0 or a preset stop value until the t
161 limit. (The preset stop value handling is not
162
163 Smart Fan II
164 ------------
165
166 W83792D also provides a special mode for fan.
167 available. When related temperature sensors de
168 temperature region (sf2_point@_fan# +- toleran
169 on programmed value from sf2_level@_fan#. You
170 for each fan.
171
172
173 /sys files
174 ----------
175
176 pwm[1-7]
177 - this file stores PWM duty cycle or D
178
179 0 (stop) to 255 (full)
180 pwm[1-3]_enable
181 - this file controls mode of fan/tempe
182
183 * 0 Disabled
184 * 1 Manual mode
185 * 2 Smart Fan II
186 * 3 Thermal Cruise
187 pwm[1-7]_mode
188 - Select PWM or DC mode
189
190 * 0 DC
191 * 1 PWM
192 thermal_cruise[1-3]
193 - Selects the desired temperature for
194 tolerance[1-3]
195 - Value in degrees of Celsius (degC) f
196 sf2_point[1-4]_fan[1-3]
197 - four temperature points for each fan
198 sf2_level[1-3]_fan[1-3]
199 - three PWM/DC levels for each fan for
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