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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' | |
8e9afcbb | 12 | Addresses scanned: from Super I/O config space (8 I/O ports) |
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13 | Datasheet: Publicly available at the ITE website |
14 | http://www.ite.com.tw/ | |
08a8f6e9 | 15 | * IT8716F/IT8726F |
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16 | Prefix: 'it8716' |
17 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
18 | Datasheet: Publicly available at the ITE website | |
19 | http://www.ite.com.tw/product_info/file/pc/IT8716F_V0.3.ZIP | |
08a8f6e9 | 20 | http://www.ite.com.tw/product_info/file/pc/IT8726F_V0.3.pdf |
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21 | * IT8718F |
22 | Prefix: 'it8718' | |
23 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
24 | Datasheet: Publicly available at the ITE website | |
25 | http://www.ite.com.tw/product_info/file/pc/IT8718F_V0.2.zip | |
26 | http://www.ite.com.tw/product_info/file/pc/IT8718F_V0%203_(for%20C%20version).zip | |
7f15b664 | 27 | * SiS950 [clone of IT8705F] |
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28 | Prefix: 'it87' |
29 | Addresses scanned: from Super I/O config space (8 I/O ports) | |
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30 | Datasheet: No longer be available |
31 | ||
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32 | Authors: |
33 | Christophe Gauthron <chrisg@0-in.com> | |
34 | Jean Delvare <khali@linux-fr.org> | |
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35 | |
36 | ||
37 | Module Parameters | |
38 | ----------------- | |
39 | ||
40 | * update_vbat: int | |
41 | ||
42 | 0 if vbat should report power on value, 1 if vbat should be updated after | |
43 | each read. Default is 0. On some boards the battery voltage is provided | |
44 | by either the battery or the onboard power supply. Only the first reading | |
45 | at power on will be the actual battery voltage (which the chip does | |
46 | automatically). On other boards the battery voltage is always fed to | |
47 | the chip so can be read at any time. Excessive reading may decrease | |
48 | battery life but no information is given in the datasheet. | |
49 | ||
50 | * fix_pwm_polarity int | |
51 | ||
52 | Force PWM polarity to active high (DANGEROUS). Some chips are | |
53 | misconfigured by BIOS - PWM values would be inverted. This option tries | |
54 | to fix this. Please contact your BIOS manufacturer and ask him for fix. | |
55 | ||
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56 | |
57 | Hardware Interfaces | |
58 | ------------------- | |
59 | ||
60 | All the chips suported by this driver are LPC Super-I/O chips, accessed | |
61 | through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an | |
62 | SMBus interface to the hardware monitoring functions. This driver no | |
63 | longer supports this interface though, as it is slower and less reliable | |
64 | than the ISA access, and was only available on a small number of | |
65 | motherboard models. | |
66 | ||
67 | ||
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68 | Description |
69 | ----------- | |
70 | ||
87673dd7 | 71 | This driver implements support for the IT8705F, IT8712F, IT8716F, |
08a8f6e9 | 72 | IT8718F, IT8726F and SiS950 chips. |
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73 | |
74 | These chips are 'Super I/O chips', supporting floppy disks, infrared ports, | |
75 | joysticks and other miscellaneous stuff. For hardware monitoring, they | |
76 | include an 'environment controller' with 3 temperature sensors, 3 fan | |
77 | rotation speed sensors, 8 voltage sensors, and associated alarms. | |
78 | ||
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79 | The IT8712F and IT8716F additionally feature VID inputs, used to report |
80 | the Vcore voltage of the processor. The early IT8712F have 5 VID pins, | |
81 | the IT8716F and late IT8712F have 6. They are shared with other functions | |
82 | though, so the functionality may not be available on a given system. | |
83 | The driver dumbly assume it is there. | |
84 | ||
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85 | The IT8718F also features VID inputs (up to 8 pins) but the value is |
86 | stored in the Super-I/O configuration space. Due to technical limitations, | |
87 | this value can currently only be read once at initialization time, so | |
88 | the driver won't notice and report changes in the VID value. The two | |
89 | upper VID bits share their pins with voltage inputs (in5 and in6) so you | |
90 | can't have both on a given board. | |
91 | ||
92 | The IT8716F, IT8718F and later IT8712F revisions have support for | |
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93 | 2 additional fans. They are supported by the driver for the IT8716F and |
94 | IT8718F but not for the IT8712F | |
17d648bf | 95 | |
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96 | The IT8716F and IT8718F, and late IT8712F and IT8705F also have optional |
97 | 16-bit tachometer counters for fans 1 to 3. This is better (no more fan | |
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98 | clock divider mess) but not compatible with the older chips and |
99 | revisions. For now, the driver only uses the 16-bit mode on the | |
87673dd7 | 100 | IT8716F and IT8718F. |
17d648bf | 101 | |
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102 | The IT8726F is just bit enhanced IT8716F with additional hardware |
103 | for AMD power sequencing. Therefore the chip will appear as IT8716F | |
104 | to userspace applications. | |
105 | ||
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106 | Temperatures are measured in degrees Celsius. An alarm is triggered once |
107 | when the Overtemperature Shutdown limit is crossed. | |
108 | ||
109 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is | |
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110 | triggered if the rotation speed has dropped below a programmable limit. When |
111 | 16-bit tachometer counters aren't used, fan readings can be divided by | |
112 | a programmable divider (1, 2, 4 or 8) to give the readings more range or | |
113 | accuracy. With a divider of 2, the lowest representable value is around | |
114 | 2600 RPM. Not all RPM values can accurately be represented, so some rounding | |
115 | is done. | |
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116 | |
117 | Voltage sensors (also known as IN sensors) report their values in volts. An | |
118 | alarm is triggered if the voltage has crossed a programmable minimum or | |
119 | maximum limit. Note that minimum in this case always means 'closest to | |
120 | zero'; this is important for negative voltage measurements. All voltage | |
121 | inputs can measure voltages between 0 and 4.08 volts, with a resolution of | |
122 | 0.016 volt. The battery voltage in8 does not have limit registers. | |
123 | ||
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124 | The VID lines (IT8712F/IT8716F/IT8718F) encode the core voltage value: |
125 | the voltage level your processor should work with. This is hardcoded by | |
126 | the mainboard and/or processor itself. It is a value in volts. | |
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127 | |
128 | If an alarm triggers, it will remain triggered until the hardware register | |
129 | is read at least once. This means that the cause for the alarm may already | |
130 | have disappeared! Note that in the current implementation, all hardware | |
131 | registers are read whenever any data is read (unless it is less than 1.5 | |
132 | seconds since the last update). This means that you can easily miss | |
133 | once-only alarms. | |
134 | ||
135 | The IT87xx only updates its values each 1.5 seconds; reading it more often | |
136 | will do no harm, but will return 'old' values. | |
137 | ||
138 | To change sensor N to a thermistor, 'echo 2 > tempN_type' where N is 1, 2, | |
139 | or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'. | |
140 | Give 0 for unused sensor. Any other value is invalid. To configure this at | |
141 | startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor; | |
142 | 3 = thermal diode) | |
143 | ||
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144 | |
145 | Fan speed control | |
146 | ----------------- | |
147 | ||
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148 | The fan speed control features are limited to manual PWM mode. Automatic |
149 | "Smart Guardian" mode control handling is not implemented. However | |
150 | if you want to go for "manual mode" just write 1 to pwmN_enable. | |
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151 | |
152 | If you are only able to control the fan speed with very small PWM values, | |
153 | try lowering the PWM base frequency (pwm1_freq). Depending on the fan, | |
154 | it may give you a somewhat greater control range. The same frequency is | |
155 | used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are | |
156 | read-only. |