Based on kernel version 2.6.33. Page generated on 2010-02-24 15:36 EST.
1 Kernel driver it87 2 ================== 3 4 Supported chips: 5 * IT8705F 6 Prefix: 'it87' 7 Addresses scanned: from Super I/O config space (8 I/O ports) 8 Datasheet: Publicly available at the ITE website 9 http://www.ite.com.tw/product_info/file/pc/IT8705F_V.0.4.1.pdf 10 * IT8712F 11 Prefix: 'it8712' 12 Addresses scanned: from Super I/O config space (8 I/O ports) 13 Datasheet: Publicly available at the ITE website 14 http://www.ite.com.tw/product_info/file/pc/IT8712F_V0.9.1.pdf 15 http://www.ite.com.tw/product_info/file/pc/Errata%20V0.1%20for%20IT8712F%20V0.9.1.pdf 16 http://www.ite.com.tw/product_info/file/pc/IT8712F_V0.9.3.pdf 17 * IT8716F/IT8726F 18 Prefix: 'it8716' 19 Addresses scanned: from Super I/O config space (8 I/O ports) 20 Datasheet: Publicly available at the ITE website 21 http://www.ite.com.tw/product_info/file/pc/IT8716F_V0.3.ZIP 22 http://www.ite.com.tw/product_info/file/pc/IT8726F_V0.3.pdf 23 * IT8718F 24 Prefix: 'it8718' 25 Addresses scanned: from Super I/O config space (8 I/O ports) 26 Datasheet: Publicly available at the ITE website 27 http://www.ite.com.tw/product_info/file/pc/IT8718F_V0.2.zip 28 http://www.ite.com.tw/product_info/file/pc/IT8718F_V0%203_(for%20C%20version).zip 29 * IT8720F 30 Prefix: 'it8720' 31 Addresses scanned: from Super I/O config space (8 I/O ports) 32 Datasheet: Not yet publicly available. 33 * SiS950 [clone of IT8705F] 34 Prefix: 'it87' 35 Addresses scanned: from Super I/O config space (8 I/O ports) 36 Datasheet: No longer be available 37 38 Authors: 39 Christophe Gauthron 40 Jean Delvare <khali[AT]linux-fr[DOT]org> 41 42 43 Module Parameters 44 ----------------- 45 46 * update_vbat: int 47 48 0 if vbat should report power on value, 1 if vbat should be updated after 49 each read. Default is 0. On some boards the battery voltage is provided 50 by either the battery or the onboard power supply. Only the first reading 51 at power on will be the actual battery voltage (which the chip does 52 automatically). On other boards the battery voltage is always fed to 53 the chip so can be read at any time. Excessive reading may decrease 54 battery life but no information is given in the datasheet. 55 56 * fix_pwm_polarity int 57 58 Force PWM polarity to active high (DANGEROUS). Some chips are 59 misconfigured by BIOS - PWM values would be inverted. This option tries 60 to fix this. Please contact your BIOS manufacturer and ask him for fix. 61 62 63 Hardware Interfaces 64 ------------------- 65 66 All the chips suported by this driver are LPC Super-I/O chips, accessed 67 through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an 68 SMBus interface to the hardware monitoring functions. This driver no 69 longer supports this interface though, as it is slower and less reliable 70 than the ISA access, and was only available on a small number of 71 motherboard models. 72 73 74 Description 75 ----------- 76 77 This driver implements support for the IT8705F, IT8712F, IT8716F, 78 IT8718F, IT8720F, IT8726F and SiS950 chips. 79 80 These chips are 'Super I/O chips', supporting floppy disks, infrared ports, 81 joysticks and other miscellaneous stuff. For hardware monitoring, they 82 include an 'environment controller' with 3 temperature sensors, 3 fan 83 rotation speed sensors, 8 voltage sensors, and associated alarms. 84 85 The IT8712F and IT8716F additionally feature VID inputs, used to report 86 the Vcore voltage of the processor. The early IT8712F have 5 VID pins, 87 the IT8716F and late IT8712F have 6. They are shared with other functions 88 though, so the functionality may not be available on a given system. 89 90 The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value 91 is stored in the Super-I/O configuration space. Due to technical limitations, 92 this value can currently only be read once at initialization time, so 93 the driver won't notice and report changes in the VID value. The two 94 upper VID bits share their pins with voltage inputs (in5 and in6) so you 95 can't have both on a given board. 96 97 The IT8716F, IT8718F, IT8720F and later IT8712F revisions have support for 98 2 additional fans. The additional fans are supported by the driver. 99 100 The IT8716F, IT8718F and IT8720F, and late IT8712F and IT8705F also have 101 optional 16-bit tachometer counters for fans 1 to 3. This is better (no more 102 fan clock divider mess) but not compatible with the older chips and 103 revisions. The 16-bit tachometer mode is enabled by the driver when one 104 of the above chips is detected. 105 106 The IT8726F is just bit enhanced IT8716F with additional hardware 107 for AMD power sequencing. Therefore the chip will appear as IT8716F 108 to userspace applications. 109 110 Temperatures are measured in degrees Celsius. An alarm is triggered once 111 when the Overtemperature Shutdown limit is crossed. 112 113 Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 114 triggered if the rotation speed has dropped below a programmable limit. When 115 16-bit tachometer counters aren't used, fan readings can be divided by 116 a programmable divider (1, 2, 4 or 8) to give the readings more range or 117 accuracy. With a divider of 2, the lowest representable value is around 118 2600 RPM. Not all RPM values can accurately be represented, so some rounding 119 is done. 120 121 Voltage sensors (also known as IN sensors) report their values in volts. An 122 alarm is triggered if the voltage has crossed a programmable minimum or 123 maximum limit. Note that minimum in this case always means 'closest to 124 zero'; this is important for negative voltage measurements. All voltage 125 inputs can measure voltages between 0 and 4.08 volts, with a resolution of 126 0.016 volt. The battery voltage in8 does not have limit registers. 127 128 The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value: 129 the voltage level your processor should work with. This is hardcoded by 130 the mainboard and/or processor itself. It is a value in volts. 131 132 If an alarm triggers, it will remain triggered until the hardware register 133 is read at least once. This means that the cause for the alarm may already 134 have disappeared! Note that in the current implementation, all hardware 135 registers are read whenever any data is read (unless it is less than 1.5 136 seconds since the last update). This means that you can easily miss 137 once-only alarms. 138 139 The IT87xx only updates its values each 1.5 seconds; reading it more often 140 will do no harm, but will return 'old' values. 141 142 To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2, 143 or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'. 144 Give 0 for unused sensor. Any other value is invalid. To configure this at 145 startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor; 146 3 = thermal diode) 147 148 149 Fan speed control 150 ----------------- 151 152 The fan speed control features are limited to manual PWM mode. Automatic 153 "Smart Guardian" mode control handling is not implemented. However 154 if you want to go for "manual mode" just write 1 to pwmN_enable. 155 156 If you are only able to control the fan speed with very small PWM values, 157 try lowering the PWM base frequency (pwm1_freq). Depending on the fan, 158 it may give you a somewhat greater control range. The same frequency is 159 used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are 160 read-only.