Root/
1 | Kernel driver w83627ehf |
2 | ======================= |
3 | |
4 | Supported chips: |
5 | * Winbond W83627EHF/EHG (ISA access ONLY) |
6 | Prefix: 'w83627ehf' |
7 | Addresses scanned: ISA address retrieved from Super I/O registers |
8 | Datasheet: not available |
9 | * Winbond W83627DHG |
10 | Prefix: 'w83627dhg' |
11 | Addresses scanned: ISA address retrieved from Super I/O registers |
12 | Datasheet: not available |
13 | * Winbond W83627DHG-P |
14 | Prefix: 'w83627dhg' |
15 | Addresses scanned: ISA address retrieved from Super I/O registers |
16 | Datasheet: not available |
17 | * Winbond W83667HG |
18 | Prefix: 'w83667hg' |
19 | Addresses scanned: ISA address retrieved from Super I/O registers |
20 | Datasheet: not available |
21 | * Winbond W83667HG-B |
22 | Prefix: 'w83667hg' |
23 | Addresses scanned: ISA address retrieved from Super I/O registers |
24 | Datasheet: Available from Nuvoton upon request |
25 | * Nuvoton NCT6775F/W83667HG-I |
26 | Prefix: 'nct6775' |
27 | Addresses scanned: ISA address retrieved from Super I/O registers |
28 | Datasheet: Available from Nuvoton upon request |
29 | * Nuvoton NCT6776F |
30 | Prefix: 'nct6776' |
31 | Addresses scanned: ISA address retrieved from Super I/O registers |
32 | Datasheet: Available from Nuvoton upon request |
33 | |
34 | Authors: |
35 | Jean Delvare <khali@linux-fr.org> |
36 | Yuan Mu (Winbond) |
37 | Rudolf Marek <r.marek@assembler.cz> |
38 | David Hubbard <david.c.hubbard@gmail.com> |
39 | Gong Jun <JGong@nuvoton.com> |
40 | |
41 | Description |
42 | ----------- |
43 | |
44 | This driver implements support for the Winbond W83627EHF, W83627EHG, |
45 | W83627DHG, W83627DHG-P, W83667HG, W83667HG-B, W83667HG-I (NCT6775F), |
46 | and NCT6776F super I/O chips. We will refer to them collectively as |
47 | Winbond chips. |
48 | |
49 | The chips implement three temperature sensors (up to four for 667HG-B, and nine |
50 | for NCT6775F and NCT6776F), five fan rotation speed sensors, ten analog voltage |
51 | sensors (only nine for the 627DHG), one VID (6 pins for the 627EHF/EHG, 8 pins |
52 | for the 627DHG and 667HG), alarms with beep warnings (control unimplemented), |
53 | and some automatic fan regulation strategies (plus manual fan control mode). |
54 | |
55 | The temperature sensor sources on W82677HG-B, NCT6775F, and NCT6776F are |
56 | configurable. temp4 and higher attributes are only reported if its temperature |
57 | source differs from the temperature sources of the already reported temperature |
58 | sensors. The configured source for each of the temperature sensors is provided |
59 | in tempX_label. |
60 | |
61 | Temperatures are measured in degrees Celsius and measurement resolution is 1 |
62 | degC for temp1 and and 0.5 degC for temp2 and temp3. For temp4 and higher, |
63 | resolution is 1 degC for W83667HG-B and 0.0 degC for NCT6775F and NCT6776F. |
64 | An alarm is triggered when the temperature gets higher than high limit; |
65 | it stays on until the temperature falls below the hysteresis value. |
66 | Alarms are only supported for temp1, temp2, and temp3. |
67 | |
68 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is |
69 | triggered if the rotation speed has dropped below a programmable limit. Fan |
70 | readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or |
71 | 128) to give the readings more range or accuracy. The driver sets the most |
72 | suitable fan divisor itself. Some fans might not be present because they |
73 | share pins with other functions. |
74 | |
75 | Voltage sensors (also known as IN sensors) report their values in millivolts. |
76 | An alarm is triggered if the voltage has crossed a programmable minimum |
77 | or maximum limit. |
78 | |
79 | The driver supports automatic fan control mode known as Thermal Cruise. |
80 | In this mode, the chip attempts to keep the measured temperature in a |
81 | predefined temperature range. If the temperature goes out of range, fan |
82 | is driven slower/faster to reach the predefined range again. |
83 | |
84 | The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as |
85 | follows: |
86 | |
87 | temp1 -> pwm1 |
88 | temp2 -> pwm2 |
89 | temp3 -> pwm3 |
90 | prog -> pwm4 (not on 667HG and 667HG-B; the programmable setting is not |
91 | supported by the driver) |
92 | |
93 | /sys files |
94 | ---------- |
95 | |
96 | name - this is a standard hwmon device entry. For the W83627EHF and W83627EHG, |
97 | it is set to "w83627ehf", for the W83627DHG it is set to "w83627dhg", |
98 | for the W83667HG and W83667HG-B it is set to "w83667hg", for NCT6775F it |
99 | is set to "nct6775", and for NCT6776F it is set to "nct6776". |
100 | |
101 | pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range: |
102 | 0 (stop) to 255 (full) |
103 | |
104 | pwm[1-4]_enable - this file controls mode of fan/temperature control: |
105 | * 1 Manual mode, write to pwm file any value 0-255 (full speed) |
106 | * 2 "Thermal Cruise" mode |
107 | * 3 "Fan Speed Cruise" mode |
108 | * 4 "Smart Fan III" mode |
109 | * 5 "Smart Fan IV" mode |
110 | |
111 | SmartFan III mode is not supported on NCT6776F. |
112 | |
113 | SmartFan IV mode is configurable only if it was configured at system |
114 | startup, and is only supported for W83677HG-B, NCT6775F, and NCT6776F. |
115 | SmartFan IV operational parameters can not be configured at this time, |
116 | and the various pwm attributes are not used in SmartFan IV mode. |
117 | The attributes can be written to, which is useful if you plan to |
118 | configure the system for a different pwm mode. However, the information |
119 | returned when reading pwm attributes is unrelated to SmartFan IV |
120 | operation. |
121 | |
122 | pwm[1-4]_mode - controls if output is PWM or DC level |
123 | * 0 DC output (0 - 12v) |
124 | * 1 PWM output |
125 | |
126 | Thermal Cruise mode |
127 | ------------------- |
128 | |
129 | If the temperature is in the range defined by: |
130 | |
131 | pwm[1-4]_target - set target temperature, unit millidegree Celsius |
132 | (range 0 - 127000) |
133 | pwm[1-4]_tolerance - tolerance, unit millidegree Celsius (range 0 - 15000) |
134 | |
135 | there are no changes to fan speed. Once the temperature leaves the interval, |
136 | fan speed increases (temp is higher) or decreases if lower than desired. |
137 | There are defined steps and times, but not exported by the driver yet. |
138 | |
139 | pwm[1-4]_min_output - minimum fan speed (range 1 - 255), when the temperature |
140 | is below defined range. |
141 | pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch |
142 | corresponding fan off. (when the temperature was below |
143 | defined range). |
144 | |
145 | Note: last two functions are influenced by other control bits, not yet exported |
146 | by the driver, so a change might not have any effect. |
147 | |
148 | Implementation Details |
149 | ---------------------- |
150 | |
151 | Future driver development should bear in mind that the following registers have |
152 | different functions on the 627EHF and the 627DHG. Some registers also have |
153 | different power-on default values, but BIOS should already be loading |
154 | appropriate defaults. Note that bank selection must be performed as is currently |
155 | done in the driver for all register addresses. |
156 | |
157 | 0x49: only on DHG, selects temperature source for AUX fan, CPU fan0 |
158 | 0x4a: not completely documented for the EHF and the DHG documentation assigns |
159 | different behavior to bits 7 and 6, including extending the temperature |
160 | input selection to SmartFan I, not just SmartFan III. Testing on the EHF |
161 | will reveal whether they are compatible or not. |
162 | |
163 | 0x58: Chip ID: 0xa1=EHF 0xc1=DHG |
164 | 0x5e: only on DHG, has bits to enable "current mode" temperature detection and |
165 | critical temperature protection |
166 | 0x45b: only on EHF, bit 3, vin4 alarm (EHF supports 10 inputs, only 9 on DHG) |
167 | 0x552: only on EHF, vin4 |
168 | 0x558: only on EHF, vin4 high limit |
169 | 0x559: only on EHF, vin4 low limit |
170 | 0x6b: only on DHG, SYS fan critical temperature |
171 | 0x6c: only on DHG, CPU fan0 critical temperature |
172 | 0x6d: only on DHG, AUX fan critical temperature |
173 | 0x6e: only on DHG, CPU fan1 critical temperature |
174 | |
175 | 0x50-0x55 and 0x650-0x657 are marked "Test Register" for the EHF, but "Reserved |
176 | Register" for the DHG |
177 | |
178 | The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and |
179 | the ICH8 southbridge gets that data via PECI from the DHG, so that the |
180 | southbridge drives the fans. And the DHG supports SST, a one-wire serial bus. |
181 | |
182 | The DHG-P has an additional automatic fan speed control mode named Smart Fan |
183 | (TM) III+. This mode is not yet supported by the driver. |
184 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9