Based on kernel version 2.6.26. Page generated on 2008-07-16 21:12 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/ 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/ 15 * IT8716F/IT8726F 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 20 http://www.ite.com.tw/product_info/file/pc/IT8726F_V0.3.pdf 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 27 * SiS950 [clone of IT8705F] 28 Prefix: 'it87' 29 Addresses scanned: from Super I/O config space (8 I/O ports) 30 Datasheet: No longer be available 31 32 Authors: 33 Christophe Gauthron 34 Jean Delvare <khali[AT]linux-fr[DOT]org> 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 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 68 Description 69 ----------- 70 71 This driver implements support for the IT8705F, IT8712F, IT8716F, 72 IT8718F, IT8726F and SiS950 chips. 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 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 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 93 2 additional fans. They are supported by the driver for the IT8716F and 94 IT8718F but not for the IT8712F 95 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 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 100 IT8716F and IT8718F. 101 102 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. 105 106 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 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. 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. 123 124 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. 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) 143 144 145 Fan speed control 146 ----------------- 147 148 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. 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.