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1Kernel driver w83627ehf2=======================3 4Supported chips:5 6 * Winbond W83627EHF/EHG (ISA access ONLY)7 8 Prefix: 'w83627ehf'9 10 Addresses scanned: ISA address retrieved from Super I/O registers11 12 Datasheet: not available13 14 * Winbond W83627DHG15 16 Prefix: 'w83627dhg'17 18 Addresses scanned: ISA address retrieved from Super I/O registers19 20 Datasheet: not available21 22 * Winbond W83627DHG-P23 24 Prefix: 'w83627dhg'25 26 Addresses scanned: ISA address retrieved from Super I/O registers27 28 Datasheet: not available29 30 * Winbond W83627UHG31 32 Prefix: 'w83627uhg'33 34 Addresses scanned: ISA address retrieved from Super I/O registers35 36 Datasheet: available from www.nuvoton.com37 38 * Winbond W83667HG39 40 Prefix: 'w83667hg'41 42 Addresses scanned: ISA address retrieved from Super I/O registers43 44 Datasheet: not available45 46 * Winbond W83667HG-B47 48 Prefix: 'w83667hg'49 50 Addresses scanned: ISA address retrieved from Super I/O registers51 52 Datasheet: Available from Nuvoton upon request53 54 * Nuvoton NCT6775F/W83667HG-I55 56 Prefix: 'nct6775'57 58 Addresses scanned: ISA address retrieved from Super I/O registers59 60 Datasheet: Available from Nuvoton upon request61 62 * Nuvoton NCT6776F63 64 Prefix: 'nct6776'65 66 Addresses scanned: ISA address retrieved from Super I/O registers67 68 Datasheet: Available from Nuvoton upon request69 70 71Authors:72 73 - Jean Delvare <jdelvare@suse.de>74 - Yuan Mu (Winbond)75 - Rudolf Marek <r.marek@assembler.cz>76 - David Hubbard <david.c.hubbard@gmail.com>77 - Gong Jun <JGong@nuvoton.com>78 79Description80-----------81 82This driver implements support for the Winbond W83627EHF, W83627EHG,83W83627DHG, W83627DHG-P, W83627UHG, W83667HG, W83667HG-B, W83667HG-I84(NCT6775F), and NCT6776F super I/O chips. We will refer to them collectively85as Winbond chips.86 87The chips implement 3 to 4 temperature sensors (9 for NCT6775F and NCT6776F),882 to 5 fan rotation speed sensors, 8 to 10 analog voltage sensors, one VID89(except for 627UHG), alarms with beep warnings (control unimplemented),90and some automatic fan regulation strategies (plus manual fan control mode).91 92The temperature sensor sources on W82677HG-B, NCT6775F, and NCT6776F are93configurable. temp4 and higher attributes are only reported if its temperature94source differs from the temperature sources of the already reported temperature95sensors. The configured source for each of the temperature sensors is provided96in tempX_label.97 98Temperatures are measured in degrees Celsius and measurement resolution is 199degC for temp1 and 0.5 degC for temp2 and temp3. For temp4 and higher,100resolution is 1 degC for W83667HG-B and 0.0 degC for NCT6775F and NCT6776F.101An alarm is triggered when the temperature gets higher than high limit;102it stays on until the temperature falls below the hysteresis value.103Alarms are only supported for temp1, temp2, and temp3.104 105Fan rotation speeds are reported in RPM (rotations per minute). An alarm is106triggered if the rotation speed has dropped below a programmable limit. Fan107readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or108128) to give the readings more range or accuracy. The driver sets the most109suitable fan divisor itself. Some fans might not be present because they110share pins with other functions.111 112Voltage sensors (also known as IN sensors) report their values in millivolts.113An alarm is triggered if the voltage has crossed a programmable minimum114or maximum limit.115 116The driver supports automatic fan control mode known as Thermal Cruise.117In this mode, the chip attempts to keep the measured temperature in a118predefined temperature range. If the temperature goes out of range, fan119is driven slower/faster to reach the predefined range again.120 121The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as122follows::123 124 temp1 -> pwm1125 temp2 -> pwm2126 temp3 -> pwm3 (not on 627UHG)127 prog -> pwm4 (not on 667HG and 667HG-B; the programmable setting is not128 supported by the driver)129 130/sys files131----------132 133name134 this is a standard hwmon device entry, it contains the name of135 the device (see the prefix in the list of supported devices at136 the top of this file)137 138pwm[1-4]139 this file stores PWM duty cycle or DC value (fan speed) in range:140 141 0 (stop) to 255 (full)142 143pwm[1-4]_enable144 this file controls mode of fan/temperature control:145 146 * 1 Manual mode, write to pwm file any value 0-255 (full speed)147 * 2 "Thermal Cruise" mode148 * 3 "Fan Speed Cruise" mode149 * 4 "Smart Fan III" mode150 * 5 "Smart Fan IV" mode151 152 SmartFan III mode is not supported on NCT6776F.153 154 SmartFan IV mode is configurable only if it was configured at system155 startup, and is only supported for W83677HG-B, NCT6775F, and NCT6776F.156 SmartFan IV operational parameters can not be configured at this time,157 and the various pwm attributes are not used in SmartFan IV mode.158 The attributes can be written to, which is useful if you plan to159 configure the system for a different pwm mode. However, the information160 returned when reading pwm attributes is unrelated to SmartFan IV161 operation.162 163pwm[1-4]_mode164 controls if output is PWM or DC level165 166 * 0 DC output (0 - 12v)167 * 1 PWM output168 169Thermal Cruise mode170-------------------171 172If the temperature is in the range defined by:173 174pwm[1-4]_target175 set target temperature, unit millidegree Celsius176 (range 0 - 127000)177pwm[1-4]_tolerance178 tolerance, unit millidegree Celsius (range 0 - 15000)179 180there are no changes to fan speed. Once the temperature leaves the interval,181fan speed increases (temp is higher) or decreases if lower than desired.182There are defined steps and times, but not exported by the driver yet.183 184pwm[1-4]_min_output185 minimum fan speed (range 1 - 255), when the temperature186 is below defined range.187pwm[1-4]_stop_time188 how many milliseconds [ms] must elapse to switch189 corresponding fan off. (when the temperature was below190 defined range).191pwm[1-4]_start_output192 minimum fan speed (range 1 - 255) when spinning up193pwm[1-4]_step_output194 rate of fan speed change (1 - 255)195pwm[1-4]_stop_output196 minimum fan speed (range 1 - 255) when spinning down197pwm[1-4]_max_output198 maximum fan speed (range 1 - 255), when the temperature199 is above defined range.200 201Note: last six functions are influenced by other control bits, not yet exported202 by the driver, so a change might not have any effect.203 204Implementation Details205----------------------206 207Future driver development should bear in mind that the following registers have208different functions on the 627EHF and the 627DHG. Some registers also have209different power-on default values, but BIOS should already be loading210appropriate defaults. Note that bank selection must be performed as is currently211done in the driver for all register addresses.212 213========================= =====================================================214Register(s) Meaning215========================= =====================================================2160x49 only on DHG, selects temperature source for AUX fan,217 CPU fan02180x4a not completely documented for the EHF and the DHG219 documentation assigns different behavior to bits 7220 and 6, including extending the temperature input221 selection to SmartFan I, not just SmartFan III.222 Testing on the EHF will reveal whether they are223 compatible or not.2240x58 Chip ID: 0xa1=EHF 0xc1=DHG2250x5e only on DHG, has bits to enable "current mode"226 temperature detection and critical temperature227 protection2280x45b only on EHF, bit 3, vin4 alarm (EHF supports 10229 inputs, only 9 on DHG)2300x552 only on EHF, vin42310x558 only on EHF, vin4 high limit2320x559 only on EHF, vin4 low limit2330x6b only on DHG, SYS fan critical temperature2340x6c only on DHG, CPU fan0 critical temperature2350x6d only on DHG, AUX fan critical temperature2360x6e only on DHG, CPU fan1 critical temperature2370x50-0x55 and 0x650-0x657 marked as:238 239 - "Test Register" for the EHF240 - "Reserved Register" for the DHG241========================= =====================================================242 243The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and244the ICH8 southbridge gets that data via PECI from the DHG, so that the245southbridge drives the fans. And the DHG supports SST, a one-wire serial bus.246 247The DHG-P has an additional automatic fan speed control mode named Smart Fan248(TM) III+. This mode is not yet supported by the driver.249