1Kernel driver it87 2================== 3 4Supported 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 38Authors: 39 Christophe Gauthron 40 Jean Delvare <khali@linux-fr.org> 41 42 43Module 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 63Hardware Interfaces 64------------------- 65 66All the chips suported by this driver are LPC Super-I/O chips, accessed 67through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an 68SMBus interface to the hardware monitoring functions. This driver no 69longer supports this interface though, as it is slower and less reliable 70than the ISA access, and was only available on a small number of 71motherboard models. 72 73 74Description 75----------- 76 77This driver implements support for the IT8705F, IT8712F, IT8716F, 78IT8718F, IT8720F, IT8726F and SiS950 chips. 79 80These chips are 'Super I/O chips', supporting floppy disks, infrared ports, 81joysticks and other miscellaneous stuff. For hardware monitoring, they 82include an 'environment controller' with 3 temperature sensors, 3 fan 83rotation speed sensors, 8 voltage sensors, and associated alarms. 84 85The IT8712F and IT8716F additionally feature VID inputs, used to report 86the Vcore voltage of the processor. The early IT8712F have 5 VID pins, 87the IT8716F and late IT8712F have 6. They are shared with other functions 88though, so the functionality may not be available on a given system. 89The driver dumbly assume it is there. 90 91The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value 92is stored in the Super-I/O configuration space. Due to technical limitations, 93this value can currently only be read once at initialization time, so 94the driver won't notice and report changes in the VID value. The two 95upper VID bits share their pins with voltage inputs (in5 and in6) so you 96can't have both on a given board. 97 98The IT8716F, IT8718F, IT8720F and later IT8712F revisions have support for 992 additional fans. The additional fans are supported by the driver. 100 101The IT8716F, IT8718F and IT8720F, and late IT8712F and IT8705F also have 102optional 16-bit tachometer counters for fans 1 to 3. This is better (no more 103fan clock divider mess) but not compatible with the older chips and 104revisions. The 16-bit tachometer mode is enabled by the driver when one 105of the above chips is detected. 106 107The IT8726F is just bit enhanced IT8716F with additional hardware 108for AMD power sequencing. Therefore the chip will appear as IT8716F 109to userspace applications. 110 111Temperatures are measured in degrees Celsius. An alarm is triggered once 112when the Overtemperature Shutdown limit is crossed. 113 114Fan rotation speeds are reported in RPM (rotations per minute). An alarm is 115triggered if the rotation speed has dropped below a programmable limit. When 11616-bit tachometer counters aren't used, fan readings can be divided by 117a programmable divider (1, 2, 4 or 8) to give the readings more range or 118accuracy. With a divider of 2, the lowest representable value is around 1192600 RPM. Not all RPM values can accurately be represented, so some rounding 120is done. 121 122Voltage sensors (also known as IN sensors) report their values in volts. An 123alarm is triggered if the voltage has crossed a programmable minimum or 124maximum limit. Note that minimum in this case always means 'closest to 125zero'; this is important for negative voltage measurements. All voltage 126inputs can measure voltages between 0 and 4.08 volts, with a resolution of 1270.016 volt. The battery voltage in8 does not have limit registers. 128 129The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value: 130the voltage level your processor should work with. This is hardcoded by 131the mainboard and/or processor itself. It is a value in volts. 132 133If an alarm triggers, it will remain triggered until the hardware register 134is read at least once. This means that the cause for the alarm may already 135have disappeared! Note that in the current implementation, all hardware 136registers are read whenever any data is read (unless it is less than 1.5 137seconds since the last update). This means that you can easily miss 138once-only alarms. 139 140The IT87xx only updates its values each 1.5 seconds; reading it more often 141will do no harm, but will return 'old' values. 142 143To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2, 144or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'. 145Give 0 for unused sensor. Any other value is invalid. To configure this at 146startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor; 1473 = thermal diode) 148 149 150Fan speed control 151----------------- 152 153The fan speed control features are limited to manual PWM mode. Automatic 154"Smart Guardian" mode control handling is not implemented. However 155if you want to go for "manual mode" just write 1 to pwmN_enable. 156 157If you are only able to control the fan speed with very small PWM values, 158try lowering the PWM base frequency (pwm1_freq). Depending on the fan, 159it may give you a somewhat greater control range. The same frequency is 160used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are 161read-only. 162