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Commit | Line | Data |
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563daaf4 RM |
1 | Kernel driver w83627ehf |
2 | ======================= | |
3 | ||
4 | Supported chips: | |
657c93b1 | 5 | * Winbond W83627EHF/EHG/DHG (ISA access ONLY) |
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6 | Prefix: 'w83627ehf' |
7 | Addresses scanned: ISA address retrieved from Super I/O registers | |
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8 | Datasheet: |
9 | http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf | |
10 | DHG datasheet confidential. | |
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11 | |
12 | Authors: | |
13 | Jean Delvare <khali@linux-fr.org> | |
3379ceee | 14 | Yuan Mu (Winbond) |
7188cc66 | 15 | Rudolf Marek <r.marek@assembler.cz> |
657c93b1 | 16 | David Hubbard <david.c.hubbard@gmail.com> |
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17 | |
18 | Description | |
19 | ----------- | |
20 | ||
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21 | This driver implements support for the Winbond W83627EHF, W83627EHG, and |
22 | W83627DHG super I/O chips. We will refer to them collectively as Winbond chips. | |
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23 | |
24 | The chips implement three temperature sensors, five fan rotation | |
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25 | speed sensors, ten analog voltage sensors (only nine for the 627DHG), alarms |
26 | with beep warnings (control unimplemented), and some automatic fan regulation | |
27 | strategies (plus manual fan control mode). | |
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28 | |
29 | Temperatures are measured in degrees Celsius and measurement resolution is 1 | |
30 | degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when | |
31 | the temperature gets higher than high limit; it stays on until the temperature | |
15fe25ca | 32 | falls below the hysteresis value. |
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33 | |
34 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is | |
35 | triggered if the rotation speed has dropped below a programmable limit. Fan | |
36 | readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or | |
37 | 128) to give the readings more range or accuracy. The driver sets the most | |
38 | suitable fan divisor itself. Some fans might not be present because they | |
39 | share pins with other functions. | |
40 | ||
41 | Voltage sensors (also known as IN sensors) report their values in millivolts. | |
42 | An alarm is triggered if the voltage has crossed a programmable minimum | |
43 | or maximum limit. | |
44 | ||
45 | The driver supports automatic fan control mode known as Thermal Cruise. | |
46 | In this mode, the chip attempts to keep the measured temperature in a | |
47 | predefined temperature range. If the temperature goes out of range, fan | |
48 | is driven slower/faster to reach the predefined range again. | |
49 | ||
50 | The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as | |
51 | follows: | |
52 | ||
53 | temp1 -> pwm1 | |
54 | temp2 -> pwm2 | |
55 | temp3 -> pwm3 | |
56 | prog -> pwm4 (the programmable setting is not supported by the driver) | |
57 | ||
58 | /sys files | |
59 | ---------- | |
60 | ||
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61 | name - this is a standard hwmon device entry. For the W83627EHF and W83627EHG, |
62 | it is set to "w83627ehf" and for the W83627DHG it is set to "w83627dhg" | |
63 | ||
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64 | pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range: |
65 | 0 (stop) to 255 (full) | |
66 | ||
67 | pwm[1-4]_enable - this file controls mode of fan/temperature control: | |
68 | * 1 Manual Mode, write to pwm file any value 0-255 (full speed) | |
69 | * 2 Thermal Cruise | |
70 | ||
71 | Thermal Cruise mode | |
72 | ------------------- | |
73 | ||
74 | If the temperature is in the range defined by: | |
75 | ||
15fe25ca | 76 | pwm[1-4]_target - set target temperature, unit millidegree Celsius |
563daaf4 | 77 | (range 0 - 127000) |
15fe25ca | 78 | pwm[1-4]_tolerance - tolerance, unit millidegree Celsius (range 0 - 15000) |
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79 | |
80 | there are no changes to fan speed. Once the temperature leaves the interval, | |
81 | fan speed increases (temp is higher) or decreases if lower than desired. | |
82 | There are defined steps and times, but not exported by the driver yet. | |
83 | ||
84 | pwm[1-4]_min_output - minimum fan speed (range 1 - 255), when the temperature | |
85 | is below defined range. | |
86 | pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch | |
87 | corresponding fan off. (when the temperature was below | |
88 | defined range). | |
89 | ||
90 | Note: last two functions are influenced by other control bits, not yet exported | |
91 | by the driver, so a change might not have any effect. | |
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92 | |
93 | Implementation Details | |
94 | ---------------------- | |
95 | ||
96 | Future driver development should bear in mind that the following registers have | |
97 | different functions on the 627EHF and the 627DHG. Some registers also have | |
98 | different power-on default values, but BIOS should already be loading | |
99 | appropriate defaults. Note that bank selection must be performed as is currently | |
100 | done in the driver for all register addresses. | |
101 | ||
102 | 0x49: only on DHG, selects temperature source for AUX fan, CPU fan0 | |
103 | 0x4a: not completely documented for the EHF and the DHG documentation assigns | |
104 | different behavior to bits 7 and 6, including extending the temperature | |
105 | input selection to SmartFan I, not just SmartFan III. Testing on the EHF | |
106 | will reveal whether they are compatible or not. | |
107 | ||
108 | 0x58: Chip ID: 0xa1=EHF 0xc1=DHG | |
109 | 0x5e: only on DHG, has bits to enable "current mode" temperature detection and | |
110 | critical temperature protection | |
111 | 0x45b: only on EHF, bit 3, vin4 alarm (EHF supports 10 inputs, only 9 on DHG) | |
112 | 0x552: only on EHF, vin4 | |
113 | 0x558: only on EHF, vin4 high limit | |
114 | 0x559: only on EHF, vin4 low limit | |
115 | 0x6b: only on DHG, SYS fan critical temperature | |
116 | 0x6c: only on DHG, CPU fan0 critical temperature | |
117 | 0x6d: only on DHG, AUX fan critical temperature | |
118 | 0x6e: only on DHG, CPU fan1 critical temperature | |
119 | ||
120 | 0x50-0x55 and 0x650-0x657 are marked "Test Register" for the EHF, but "Reserved | |
121 | Register" for the DHG | |
122 | ||
123 | The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and | |
124 | the ICH8 southbridge gets that data via PECI from the DHG, so that the | |
125 | southbridge drives the fans. And the DHG supports SST, a one-wire serial bus. |