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1 | Kernel driver it87 |
2 | ================== | |
3 | ||
4 | Supported chips: | |
5 | * IT8705F | |
6 | Prefix: 'it87' | |
91749996 | 7 | Addresses scanned: from Super I/O config space (8 I/O ports) |
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8 | Datasheet: Publicly available at the ITE website |
9 | http://www.ite.com.tw/ | |
10 | * IT8712F | |
11 | Prefix: 'it8712' | |
c5e3fbf2 | 12 | Addresses scanned: I2C 0x2d |
91749996 | 13 | from Super I/O config space (8 I/O ports) |
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14 | Datasheet: Publicly available at the ITE website |
15 | http://www.ite.com.tw/ | |
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16 | * IT8716F |
17 | Prefix: 'it8716' | |
18 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
19 | Datasheet: Publicly available at the ITE website | |
20 | http://www.ite.com.tw/product_info/file/pc/IT8716F_V0.3.ZIP | |
7f15b664 | 21 | * SiS950 [clone of IT8705F] |
91749996 JD |
22 | Prefix: 'it87' |
23 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
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24 | Datasheet: No longer be available |
25 | ||
26 | Author: Christophe Gauthron <chrisg@0-in.com> | |
27 | ||
28 | ||
29 | Module Parameters | |
30 | ----------------- | |
31 | ||
32 | * update_vbat: int | |
33 | ||
34 | 0 if vbat should report power on value, 1 if vbat should be updated after | |
35 | each read. Default is 0. On some boards the battery voltage is provided | |
36 | by either the battery or the onboard power supply. Only the first reading | |
37 | at power on will be the actual battery voltage (which the chip does | |
38 | automatically). On other boards the battery voltage is always fed to | |
39 | the chip so can be read at any time. Excessive reading may decrease | |
40 | battery life but no information is given in the datasheet. | |
41 | ||
42 | * fix_pwm_polarity int | |
43 | ||
44 | Force PWM polarity to active high (DANGEROUS). Some chips are | |
45 | misconfigured by BIOS - PWM values would be inverted. This option tries | |
46 | to fix this. Please contact your BIOS manufacturer and ask him for fix. | |
47 | ||
48 | Description | |
49 | ----------- | |
50 | ||
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51 | This driver implements support for the IT8705F, IT8712F, IT8716F and |
52 | SiS950 chips. | |
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53 | |
54 | These chips are 'Super I/O chips', supporting floppy disks, infrared ports, | |
55 | joysticks and other miscellaneous stuff. For hardware monitoring, they | |
56 | include an 'environment controller' with 3 temperature sensors, 3 fan | |
57 | rotation speed sensors, 8 voltage sensors, and associated alarms. | |
58 | ||
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59 | The IT8712F and IT8716F additionally feature VID inputs, used to report |
60 | the Vcore voltage of the processor. The early IT8712F have 5 VID pins, | |
61 | the IT8716F and late IT8712F have 6. They are shared with other functions | |
62 | though, so the functionality may not be available on a given system. | |
63 | The driver dumbly assume it is there. | |
64 | ||
65 | The IT8716F and later IT8712F revisions have support for 2 additional | |
66 | fans. They are not yet supported by the driver. | |
67 | ||
68 | The IT8716F and late IT8712F and IT8705F also have optional 16-bit | |
69 | tachometer counters for fans 1 to 3. This is better (no more fan | |
70 | clock divider mess) but not compatible with the older chips and | |
71 | revisions. For now, the driver only uses the 16-bit mode on the | |
72 | IT8716F. | |
73 | ||
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74 | Temperatures are measured in degrees Celsius. An alarm is triggered once |
75 | when the Overtemperature Shutdown limit is crossed. | |
76 | ||
77 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is | |
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78 | triggered if the rotation speed has dropped below a programmable limit. When |
79 | 16-bit tachometer counters aren't used, fan readings can be divided by | |
80 | a programmable divider (1, 2, 4 or 8) to give the readings more range or | |
81 | accuracy. With a divider of 2, the lowest representable value is around | |
82 | 2600 RPM. Not all RPM values can accurately be represented, so some rounding | |
83 | is done. | |
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84 | |
85 | Voltage sensors (also known as IN sensors) report their values in volts. An | |
86 | alarm is triggered if the voltage has crossed a programmable minimum or | |
87 | maximum limit. Note that minimum in this case always means 'closest to | |
88 | zero'; this is important for negative voltage measurements. All voltage | |
89 | inputs can measure voltages between 0 and 4.08 volts, with a resolution of | |
90 | 0.016 volt. The battery voltage in8 does not have limit registers. | |
91 | ||
17d648bf | 92 | The VID lines (IT8712F/IT8716F) encode the core voltage value: the voltage |
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93 | level your processor should work with. This is hardcoded by the mainboard |
94 | and/or processor itself. It is a value in volts. | |
95 | ||
96 | If an alarm triggers, it will remain triggered until the hardware register | |
97 | is read at least once. This means that the cause for the alarm may already | |
98 | have disappeared! Note that in the current implementation, all hardware | |
99 | registers are read whenever any data is read (unless it is less than 1.5 | |
100 | seconds since the last update). This means that you can easily miss | |
101 | once-only alarms. | |
102 | ||
103 | The IT87xx only updates its values each 1.5 seconds; reading it more often | |
104 | will do no harm, but will return 'old' values. | |
105 | ||
106 | To change sensor N to a thermistor, 'echo 2 > tempN_type' where N is 1, 2, | |
107 | or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'. | |
108 | Give 0 for unused sensor. Any other value is invalid. To configure this at | |
109 | startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor; | |
110 | 3 = thermal diode) | |
111 | ||
112 | The fan speed control features are limited to manual PWM mode. Automatic | |
113 | "Smart Guardian" mode control handling is not implemented. However | |
114 | if you want to go for "manual mode" just write 1 to pwmN_enable. |