| 1 | Kernel driver w83627ehf |
| 2 | ======================= |
| 3 | |
| 4 | Supported chips: |
| 5 | * Winbond W83627EHF/EHG (ISA access ONLY) |
| 6 | Prefix: 'w83627ehf' |
| 7 | Addresses scanned: ISA address retrieved from Super I/O registers |
| 8 | Datasheet: |
| 9 | http://www.nuvoton.com.tw/NR/rdonlyres/A6A258F0-F0C9-4F97-81C0-C4D29E7E943E/0/W83627EHF.pdf |
| 10 | * Winbond W83627DHG |
| 11 | Prefix: 'w83627dhg' |
| 12 | Addresses scanned: ISA address retrieved from Super I/O registers |
| 13 | Datasheet: |
| 14 | http://www.nuvoton.com.tw/NR/rdonlyres/7885623D-A487-4CF9-A47F-30C5F73D6FE6/0/W83627DHG.pdf |
| 15 | * Winbond W83627DHG-P |
| 16 | Prefix: 'w83627dhg' |
| 17 | Addresses scanned: ISA address retrieved from Super I/O registers |
| 18 | Datasheet: not available |
| 19 | * Winbond W83667HG |
| 20 | Prefix: 'w83667hg' |
| 21 | Addresses scanned: ISA address retrieved from Super I/O registers |
| 22 | Datasheet: not available |
| 23 | |
| 24 | Authors: |
| 25 | Jean Delvare <khali@linux-fr.org> |
| 26 | Yuan Mu (Winbond) |
| 27 | Rudolf Marek <r.marek@assembler.cz> |
| 28 | David Hubbard <david.c.hubbard@gmail.com> |
| 29 | Gong Jun <JGong@nuvoton.com> |
| 30 | |
| 31 | Description |
| 32 | ----------- |
| 33 | |
| 34 | This driver implements support for the Winbond W83627EHF, W83627EHG, |
| 35 | W83627DHG, W83627DHG-P and W83667HG super I/O chips. We will refer to them |
| 36 | collectively as Winbond chips. |
| 37 | |
| 38 | The chips implement three temperature sensors, five fan rotation |
| 39 | speed sensors, ten analog voltage sensors (only nine for the 627DHG), one |
| 40 | VID (6 pins for the 627EHF/EHG, 8 pins for the 627DHG and 667HG), alarms |
| 41 | with beep warnings (control unimplemented), and some automatic fan |
| 42 | regulation strategies (plus manual fan control mode). |
| 43 | |
| 44 | Temperatures are measured in degrees Celsius and measurement resolution is 1 |
| 45 | degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when |
| 46 | the temperature gets higher than high limit; it stays on until the temperature |
| 47 | falls below the hysteresis value. |
| 48 | |
| 49 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is |
| 50 | triggered if the rotation speed has dropped below a programmable limit. Fan |
| 51 | readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or |
| 52 | 128) to give the readings more range or accuracy. The driver sets the most |
| 53 | suitable fan divisor itself. Some fans might not be present because they |
| 54 | share pins with other functions. |
| 55 | |
| 56 | Voltage sensors (also known as IN sensors) report their values in millivolts. |
| 57 | An alarm is triggered if the voltage has crossed a programmable minimum |
| 58 | or maximum limit. |
| 59 | |
| 60 | The driver supports automatic fan control mode known as Thermal Cruise. |
| 61 | In this mode, the chip attempts to keep the measured temperature in a |
| 62 | predefined temperature range. If the temperature goes out of range, fan |
| 63 | is driven slower/faster to reach the predefined range again. |
| 64 | |
| 65 | The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as |
| 66 | follows: |
| 67 | |
| 68 | temp1 -> pwm1 |
| 69 | temp2 -> pwm2 |
| 70 | temp3 -> pwm3 |
| 71 | prog -> pwm4 (not on 667HG; the programmable setting is not supported by |
| 72 | the driver) |
| 73 | |
| 74 | /sys files |
| 75 | ---------- |
| 76 | |
| 77 | name - this is a standard hwmon device entry. For the W83627EHF and W83627EHG, |
| 78 | it is set to "w83627ehf" and for the W83627DHG it is set to "w83627dhg" |
| 79 | |
| 80 | pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range: |
| 81 | 0 (stop) to 255 (full) |
| 82 | |
| 83 | pwm[1-4]_enable - this file controls mode of fan/temperature control: |
| 84 | * 1 Manual mode, write to pwm file any value 0-255 (full speed) |
| 85 | * 2 "Thermal Cruise" mode |
| 86 | * 3 "Fan Speed Cruise" mode |
| 87 | * 4 "Smart Fan III" mode |
| 88 | |
| 89 | pwm[1-4]_mode - controls if output is PWM or DC level |
| 90 | * 0 DC output (0 - 12v) |
| 91 | * 1 PWM output |
| 92 | |
| 93 | Thermal Cruise mode |
| 94 | ------------------- |
| 95 | |
| 96 | If the temperature is in the range defined by: |
| 97 | |
| 98 | pwm[1-4]_target - set target temperature, unit millidegree Celsius |
| 99 | (range 0 - 127000) |
| 100 | pwm[1-4]_tolerance - tolerance, unit millidegree Celsius (range 0 - 15000) |
| 101 | |
| 102 | there are no changes to fan speed. Once the temperature leaves the interval, |
| 103 | fan speed increases (temp is higher) or decreases if lower than desired. |
| 104 | There are defined steps and times, but not exported by the driver yet. |
| 105 | |
| 106 | pwm[1-4]_min_output - minimum fan speed (range 1 - 255), when the temperature |
| 107 | is below defined range. |
| 108 | pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch |
| 109 | corresponding fan off. (when the temperature was below |
| 110 | defined range). |
| 111 | |
| 112 | Note: last two functions are influenced by other control bits, not yet exported |
| 113 | by the driver, so a change might not have any effect. |
| 114 | |
| 115 | Implementation Details |
| 116 | ---------------------- |
| 117 | |
| 118 | Future driver development should bear in mind that the following registers have |
| 119 | different functions on the 627EHF and the 627DHG. Some registers also have |
| 120 | different power-on default values, but BIOS should already be loading |
| 121 | appropriate defaults. Note that bank selection must be performed as is currently |
| 122 | done in the driver for all register addresses. |
| 123 | |
| 124 | 0x49: only on DHG, selects temperature source for AUX fan, CPU fan0 |
| 125 | 0x4a: not completely documented for the EHF and the DHG documentation assigns |
| 126 | different behavior to bits 7 and 6, including extending the temperature |
| 127 | input selection to SmartFan I, not just SmartFan III. Testing on the EHF |
| 128 | will reveal whether they are compatible or not. |
| 129 | |
| 130 | 0x58: Chip ID: 0xa1=EHF 0xc1=DHG |
| 131 | 0x5e: only on DHG, has bits to enable "current mode" temperature detection and |
| 132 | critical temperature protection |
| 133 | 0x45b: only on EHF, bit 3, vin4 alarm (EHF supports 10 inputs, only 9 on DHG) |
| 134 | 0x552: only on EHF, vin4 |
| 135 | 0x558: only on EHF, vin4 high limit |
| 136 | 0x559: only on EHF, vin4 low limit |
| 137 | 0x6b: only on DHG, SYS fan critical temperature |
| 138 | 0x6c: only on DHG, CPU fan0 critical temperature |
| 139 | 0x6d: only on DHG, AUX fan critical temperature |
| 140 | 0x6e: only on DHG, CPU fan1 critical temperature |
| 141 | |
| 142 | 0x50-0x55 and 0x650-0x657 are marked "Test Register" for the EHF, but "Reserved |
| 143 | Register" for the DHG |
| 144 | |
| 145 | The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and |
| 146 | the ICH8 southbridge gets that data via PECI from the DHG, so that the |
| 147 | southbridge drives the fans. And the DHG supports SST, a one-wire serial bus. |
| 148 | |
| 149 | The DHG-P has an additional automatic fan speed control mode named Smart Fan |
| 150 | (TM) III+. This mode is not yet supported by the driver. |