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1Kernel driver it872==================3 4Supported chips:5 6 * IT8603E/IT8623E7 8 Prefix: 'it8603'9 10 Addresses scanned: from Super I/O config space (8 I/O ports)11 12 Datasheet: Not publicly available13 14 * IT8620E15 16 Prefix: 'it8620'17 18 Addresses scanned: from Super I/O config space (8 I/O ports)19 20 * IT8628E21 22 Prefix: 'it8628'23 24 Addresses scanned: from Super I/O config space (8 I/O ports)25 26 Datasheet: Not publicly available27 28 * IT8705F29 30 Prefix: 'it87'31 32 Addresses scanned: from Super I/O config space (8 I/O ports)33 34 Datasheet: Once publicly available at the ITE website, but no longer35 36 * IT8712F37 38 Prefix: 'it8712'39 40 Addresses scanned: from Super I/O config space (8 I/O ports)41 42 Datasheet: Once publicly available at the ITE website, but no longer43 44 * IT8716F/IT8726F45 46 Prefix: 'it8716'47 48 Addresses scanned: from Super I/O config space (8 I/O ports)49 50 Datasheet: Once publicly available at the ITE website, but no longer51 52 * IT8718F53 54 Prefix: 'it8718'55 56 Addresses scanned: from Super I/O config space (8 I/O ports)57 58 Datasheet: Once publicly available at the ITE website, but no longer59 60 * IT8720F61 62 Prefix: 'it8720'63 64 Addresses scanned: from Super I/O config space (8 I/O ports)65 66 Datasheet: Not publicly available67 68 * IT8721F/IT8758E69 70 Prefix: 'it8721'71 72 Addresses scanned: from Super I/O config space (8 I/O ports)73 74 Datasheet: Not publicly available75 76 * IT8728F77 78 Prefix: 'it8728'79 80 Addresses scanned: from Super I/O config space (8 I/O ports)81 82 Datasheet: Not publicly available83 84 * IT8732F85 86 Prefix: 'it8732'87 88 Addresses scanned: from Super I/O config space (8 I/O ports)89 90 Datasheet: Not publicly available91 92 * IT8771E93 94 Prefix: 'it8771'95 96 Addresses scanned: from Super I/O config space (8 I/O ports)97 98 Datasheet: Not publicly available99 100 * IT8772E101 102 Prefix: 'it8772'103 104 Addresses scanned: from Super I/O config space (8 I/O ports)105 106 Datasheet: Not publicly available107 108 * IT8781F109 110 Prefix: 'it8781'111 112 Addresses scanned: from Super I/O config space (8 I/O ports)113 114 Datasheet: Not publicly available115 116 * IT8782F117 118 Prefix: 'it8782'119 120 Addresses scanned: from Super I/O config space (8 I/O ports)121 122 Datasheet: Not publicly available123 124 * IT8783E/F125 126 Prefix: 'it8783'127 128 Addresses scanned: from Super I/O config space (8 I/O ports)129 130 Datasheet: Not publicly available131 132 * IT8786E133 134 Prefix: 'it8786'135 136 Addresses scanned: from Super I/O config space (8 I/O ports)137 138 Datasheet: Not publicly available139 140 * IT8790E141 142 Prefix: 'it8790'143 144 Addresses scanned: from Super I/O config space (8 I/O ports)145 146 Datasheet: Not publicly available147 148 * IT8792E/IT8795E149 150 Prefix: 'it8792'151 152 Addresses scanned: from Super I/O config space (8 I/O ports)153 154 Datasheet: Not publicly available155 156 * IT87952E157 158 Prefix: 'it87952'159 160 Addresses scanned: from Super I/O config space (8 I/O ports)161 162 Datasheet: Not publicly available163 164 * SiS950 [clone of IT8705F]165 166 Prefix: 'it87'167 168 Addresses scanned: from Super I/O config space (8 I/O ports)169 170 Datasheet: No longer be available171 172 173Authors:174 - Christophe Gauthron175 - Jean Delvare <jdelvare@suse.de>176 177 178Module Parameters179-----------------180 181* update_vbat bool182 0 if vbat should report power on value, 1 if vbat should be updated after183 each read. Default is 0. On some boards the battery voltage is provided184 by either the battery or the onboard power supply. Only the first reading185 at power on will be the actual battery voltage (which the chip does186 automatically). On other boards the battery voltage is always fed to187 the chip so can be read at any time. Excessive reading may decrease188 battery life but no information is given in the datasheet.189 190* fix_pwm_polarity bool191 Force PWM polarity to active high (DANGEROUS). Some chips are192 misconfigured by BIOS - PWM values would be inverted. This option tries193 to fix this. Please contact your BIOS manufacturer and ask him for fix.194 195* force_id short, short196 197 Force multiple chip ID to specified value, separated by ','.198 For example "force_id=0x8689,0x8633". A value of 0 is ignored199 for that chip.200 Note: A single force_id value (e.g. "force_id=0x8689") is used for201 all chips, to only set the first chip use "force_id=0x8689,0".202 Should only be used for testing.203 204* ignore_resource_conflict bool205 206 Similar to acpi_enforce_resources=lax, but only affects this driver.207 ACPI resource conflicts are ignored if this parameter is provided and208 set to 1.209 Provided since there are reports that system-wide acpi_enfore_resources=lax210 can result in boot failures on some systems.211 Note: This is inherently risky since it means that both ACPI and this driver212 may access the chip at the same time. This can result in race conditions and,213 worst case, result in unexpected system reboots.214 215 216Hardware Interfaces217-------------------218 219All the chips supported by this driver are LPC Super-I/O chips, accessed220through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an221SMBus interface to the hardware monitoring functions. This driver no222longer supports this interface though, as it is slower and less reliable223than the ISA access, and was only available on a small number of224motherboard models.225 226 227Description228-----------229 230This driver implements support for the IT8603E, IT8620E, IT8623E, IT8628E,231IT8705F, IT8712F, IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8732F,232IT8758E, IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, IT8790E,233IT8792E/IT8795E, IT87952E and SiS950 chips.234 235These chips are 'Super I/O chips', supporting floppy disks, infrared ports,236joysticks and other miscellaneous stuff. For hardware monitoring, they237include an 'environment controller' with 3 temperature sensors, 3 fan238rotation speed sensors, 8 voltage sensors, associated alarms, and chassis239intrusion detection.240 241The IT8712F and IT8716F additionally feature VID inputs, used to report242the Vcore voltage of the processor. The early IT8712F have 5 VID pins,243the IT8716F and late IT8712F have 6. They are shared with other functions244though, so the functionality may not be available on a given system.245 246The IT8718F and IT8720F also features VID inputs (up to 8 pins) but the value247is stored in the Super-I/O configuration space. Due to technical limitations,248this value can currently only be read once at initialization time, so249the driver won't notice and report changes in the VID value. The two250upper VID bits share their pins with voltage inputs (in5 and in6) so you251can't have both on a given board.252 253The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E and later IT8712F revisions254have support for 2 additional fans. The additional fans are supported by the255driver.256 257The IT8716F, IT8718F, IT8720F, IT8721F/IT8758E, IT8732F, IT8781F, IT8782F,258IT8783E/F, and late IT8712F and IT8705F also have optional 16-bit tachometer259counters for fans 1 to 3. This is better (no more fan clock divider mess) but260not compatible with the older chips and revisions. The 16-bit tachometer mode261is enabled by the driver when one of the above chips is detected.262 263The IT8726F is just bit enhanced IT8716F with additional hardware264for AMD power sequencing. Therefore the chip will appear as IT8716F265to userspace applications.266 267The IT8728F, IT8771E, and IT8772E are considered compatible with the IT8721F,268until a datasheet becomes available (hopefully.)269 270The IT8603E/IT8623E is a custom design, hardware monitoring part is similar to271IT8728F. It only supports 3 fans, 16-bit fan mode, and the full speed mode272of the fan is not supported (value 0 of pwmX_enable).273 274The IT8620E and IT8628E are custom designs, hardware monitoring part is similar275to IT8728F. It only supports 16-bit fan mode. Both chips support up to 6 fans.276 277The IT8790E, IT8792E/IT8795E and IT87952E support up to 3 fans. 16-bit fan278mode is always enabled.279 280The IT8732F supports a closed-loop mode for fan control, but this is not281currently implemented by the driver.282 283Temperatures are measured in degrees Celsius. An alarm is triggered once284when the Overtemperature Shutdown limit is crossed.285 286Fan rotation speeds are reported in RPM (rotations per minute). An alarm is287triggered if the rotation speed has dropped below a programmable limit. When28816-bit tachometer counters aren't used, fan readings can be divided by289a programmable divider (1, 2, 4 or 8) to give the readings more range or290accuracy. With a divider of 2, the lowest representable value is around2912600 RPM. Not all RPM values can accurately be represented, so some rounding292is done.293 294Voltage sensors (also known as IN sensors) report their values in volts. An295alarm is triggered if the voltage has crossed a programmable minimum or296maximum limit. Note that minimum in this case always means 'closest to297zero'; this is important for negative voltage measurements. On most chips, all298voltage inputs can measure voltages between 0 and 4.08 volts, with a resolution299of 0.016 volt. IT8603E, IT8721F/IT8758E and IT8728F can measure between 0 and3003.06 volts, with a resolution of 0.012 volt. IT8732F can measure between 0 and3012.8 volts with a resolution of 0.0109 volt. The battery voltage in8 does not302have limit registers.303 304On the IT8603E, IT8620E, IT8628E, IT8721F/IT8758E, IT8732F, IT8781F, IT8782F,305and IT8783E/F, some voltage inputs are internal and scaled inside the chip:306* in3 (optional)307* in7 (optional for IT8781F, IT8782F, and IT8783E/F)308* in8 (always)309* in9 (relevant for IT8603E only)310The driver handles this transparently so user-space doesn't have to care.311 312The VID lines (IT8712F/IT8716F/IT8718F/IT8720F) encode the core voltage value:313the voltage level your processor should work with. This is hardcoded by314the mainboard and/or processor itself. It is a value in volts.315 316If an alarm triggers, it will remain triggered until the hardware register317is read at least once. This means that the cause for the alarm may already318have disappeared! Note that in the current implementation, all hardware319registers are read whenever any data is read (unless it is less than 1.5320seconds since the last update). This means that you can easily miss321once-only alarms.322 323Out-of-limit readings can also result in beeping, if the chip is properly324wired and configured. Beeping can be enabled or disabled per sensor type325(temperatures, voltages and fans.)326 327The IT87xx only updates its values each 1.5 seconds; reading it more often328will do no harm, but will return 'old' values.329 330To change sensor N to a thermistor, 'echo 4 > tempN_type' where N is 1, 2,331or 3. To change sensor N to a thermal diode, 'echo 3 > tempN_type'.332Give 0 for unused sensor. Any other value is invalid. To configure this at333startup, consult lm_sensors's /etc/sensors.conf. (4 = thermistor;3343 = thermal diode)335 336 337Fan speed control338-----------------339 340The fan speed control features are limited to manual PWM mode. Automatic341"Smart Guardian" mode control handling is only implemented for older chips342(see below.) However if you want to go for "manual mode" just write 1 to343pwmN_enable.344 345If you are only able to control the fan speed with very small PWM values,346try lowering the PWM base frequency (pwm1_freq). Depending on the fan,347it may give you a somewhat greater control range. The same frequency is348used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are349read-only.350 351 352Automatic fan speed control (old interface)353-------------------------------------------354 355The driver supports the old interface to automatic fan speed control356which is implemented by IT8705F chips up to revision F and IT8712F357chips up to revision G.358 359This interface implements 4 temperature vs. PWM output trip points.360The PWM output of trip point 4 is always the maximum value (fan running361at full speed) while the PWM output of the other 3 trip points can be362freely chosen. The temperature of all 4 trip points can be freely chosen.363Additionally, trip point 1 has an hysteresis temperature attached, to364prevent fast switching between fan on and off.365 366The chip automatically computes the PWM output value based on the input367temperature, based on this simple rule: if the temperature value is368between trip point N and trip point N+1 then the PWM output value is369the one of trip point N. The automatic control mode is less flexible370than the manual control mode, but it reacts faster, is more robust and371doesn't use CPU cycles.372 373Trip points must be set properly before switching to automatic fan speed374control mode. The driver will perform basic integrity checks before375actually switching to automatic control mode.376 377 378Temperature offset attributes379-----------------------------380 381The driver supports temp[1-3]_offset sysfs attributes to adjust the reported382temperature for thermal diodes or diode-connected thermal transistors.383If a temperature sensor is configured for thermistors, the attribute values384are ignored. If the thermal sensor type is Intel PECI, the temperature offset385must be programmed to the critical CPU temperature.386