| | 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: not available |
| | 9 | * Winbond W83627DHG |
| | 10 | Prefix: 'w83627dhg' |
| | 11 | Addresses scanned: ISA address retrieved from Super I/O registers |
| | 12 | Datasheet: not available |
| | 13 | * Winbond W83627DHG-P |
| | 14 | Prefix: 'w83627dhg' |
| | 15 | Addresses scanned: ISA address retrieved from Super I/O registers |
| | 16 | Datasheet: not available |
| | 17 | * Winbond W83627UHG |
| | 18 | Prefix: 'w83627uhg' |
| | 19 | Addresses scanned: ISA address retrieved from Super I/O registers |
| | 20 | Datasheet: available from www.nuvoton.com |
| | 21 | * Winbond W83667HG |
| | 22 | Prefix: 'w83667hg' |
| | 23 | Addresses scanned: ISA address retrieved from Super I/O registers |
| | 24 | Datasheet: not available |
| | 25 | * Winbond W83667HG-B |
| | 26 | Prefix: 'w83667hg' |
| | 27 | Addresses scanned: ISA address retrieved from Super I/O registers |
| | 28 | Datasheet: Available from Nuvoton upon request |
| | 29 | * Nuvoton NCT6775F/W83667HG-I |
| | 30 | Prefix: 'nct6775' |
| | 31 | Addresses scanned: ISA address retrieved from Super I/O registers |
| | 32 | Datasheet: Available from Nuvoton upon request |
| | 33 | * Nuvoton NCT6776F |
| | 34 | Prefix: 'nct6776' |
| | 35 | Addresses scanned: ISA address retrieved from Super I/O registers |
| | 36 | Datasheet: Available from Nuvoton upon request |
| | 37 | |
| | 38 | Authors: |
| | 39 | Jean Delvare <jdelvare@suse.de> |
| | 40 | Yuan Mu (Winbond) |
| | 41 | Rudolf Marek <r.marek@assembler.cz> |
| | 42 | David Hubbard <david.c.hubbard@gmail.com> |
| | 43 | Gong Jun <JGong@nuvoton.com> |
| | 44 | |
| | 45 | Description |
| | 46 | ----------- |
| | 47 | |
| | 48 | This driver implements support for the Winbond W83627EHF, W83627EHG, |
| | 49 | W83627DHG, W83627DHG-P, W83627UHG, W83667HG, W83667HG-B, W83667HG-I |
| | 50 | (NCT6775F), and NCT6776F super I/O chips. We will refer to them collectively |
| | 51 | as Winbond chips. |
| | 52 | |
| | 53 | The chips implement 3 to 4 temperature sensors (9 for NCT6775F and NCT6776F), |
| | 54 | 2 to 5 fan rotation speed sensors, 8 to 10 analog voltage sensors, one VID |
| | 55 | (except for 627UHG), alarms with beep warnings (control unimplemented), |
| | 56 | and some automatic fan regulation strategies (plus manual fan control mode). |
| | 57 | |
| | 58 | The temperature sensor sources on W82677HG-B, NCT6775F, and NCT6776F are |
| | 59 | configurable. temp4 and higher attributes are only reported if its temperature |
| | 60 | source differs from the temperature sources of the already reported temperature |
| | 61 | sensors. The configured source for each of the temperature sensors is provided |
| | 62 | in tempX_label. |
| | 63 | |
| | 64 | Temperatures are measured in degrees Celsius and measurement resolution is 1 |
| | 65 | degC for temp1 and and 0.5 degC for temp2 and temp3. For temp4 and higher, |
| | 66 | resolution is 1 degC for W83667HG-B and 0.0 degC for NCT6775F and NCT6776F. |
| | 67 | An alarm is triggered when the temperature gets higher than high limit; |
| | 68 | it stays on until the temperature falls below the hysteresis value. |
| | 69 | Alarms are only supported for temp1, temp2, and temp3. |
| | 70 | |
| | 71 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is |
| | 72 | triggered if the rotation speed has dropped below a programmable limit. Fan |
| | 73 | readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or |
| | 74 | 128) to give the readings more range or accuracy. The driver sets the most |
| | 75 | suitable fan divisor itself. Some fans might not be present because they |
| | 76 | share pins with other functions. |
| | 77 | |
| | 78 | Voltage sensors (also known as IN sensors) report their values in millivolts. |
| | 79 | An alarm is triggered if the voltage has crossed a programmable minimum |
| | 80 | or maximum limit. |
| | 81 | |
| | 82 | The driver supports automatic fan control mode known as Thermal Cruise. |
| | 83 | In this mode, the chip attempts to keep the measured temperature in a |
| | 84 | predefined temperature range. If the temperature goes out of range, fan |
| | 85 | is driven slower/faster to reach the predefined range again. |
| | 86 | |
| | 87 | The mode works for fan1-fan4. Mapping of temperatures to pwm outputs is as |
| | 88 | follows: |
| | 89 | |
| | 90 | temp1 -> pwm1 |
| | 91 | temp2 -> pwm2 |
| | 92 | temp3 -> pwm3 (not on 627UHG) |
| | 93 | prog -> pwm4 (not on 667HG and 667HG-B; the programmable setting is not |
| | 94 | supported by the driver) |
| | 95 | |
| | 96 | /sys files |
| | 97 | ---------- |
| | 98 | |
| | 99 | name - this is a standard hwmon device entry, it contains the name of |
| | 100 | the device (see the prefix in the list of supported devices at |
| | 101 | the top of this file) |
| | 102 | |
| | 103 | pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range: |
| | 104 | 0 (stop) to 255 (full) |
| | 105 | |
| | 106 | pwm[1-4]_enable - this file controls mode of fan/temperature control: |
| | 107 | * 1 Manual mode, write to pwm file any value 0-255 (full speed) |
| | 108 | * 2 "Thermal Cruise" mode |
| | 109 | * 3 "Fan Speed Cruise" mode |
| | 110 | * 4 "Smart Fan III" mode |
| | 111 | * 5 "Smart Fan IV" mode |
| | 112 | |
| | 113 | SmartFan III mode is not supported on NCT6776F. |
| | 114 | |
| | 115 | SmartFan IV mode is configurable only if it was configured at system |
| | 116 | startup, and is only supported for W83677HG-B, NCT6775F, and NCT6776F. |
| | 117 | SmartFan IV operational parameters can not be configured at this time, |
| | 118 | and the various pwm attributes are not used in SmartFan IV mode. |
| | 119 | The attributes can be written to, which is useful if you plan to |
| | 120 | configure the system for a different pwm mode. However, the information |
| | 121 | returned when reading pwm attributes is unrelated to SmartFan IV |
| | 122 | operation. |
| | 123 | |
| | 124 | pwm[1-4]_mode - controls if output is PWM or DC level |
| | 125 | * 0 DC output (0 - 12v) |
| | 126 | * 1 PWM output |
| | 127 | |
| | 128 | Thermal Cruise mode |
| | 129 | ------------------- |
| | 130 | |
| | 131 | If the temperature is in the range defined by: |
| | 132 | |
| | 133 | pwm[1-4]_target - set target temperature, unit millidegree Celsius |
| | 134 | (range 0 - 127000) |
| | 135 | pwm[1-4]_tolerance - tolerance, unit millidegree Celsius (range 0 - 15000) |
| | 136 | |
| | 137 | there are no changes to fan speed. Once the temperature leaves the interval, |
| | 138 | fan speed increases (temp is higher) or decreases if lower than desired. |
| | 139 | There are defined steps and times, but not exported by the driver yet. |
| | 140 | |
| | 141 | pwm[1-4]_min_output - minimum fan speed (range 1 - 255), when the temperature |
| | 142 | is below defined range. |
| | 143 | pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch |
| | 144 | corresponding fan off. (when the temperature was below |
| | 145 | defined range). |
| | 146 | pwm[1-4]_start_output-minimum fan speed (range 1 - 255) when spinning up |
| | 147 | pwm[1-4]_step_output- rate of fan speed change (1 - 255) |
| | 148 | pwm[1-4]_stop_output- minimum fan speed (range 1 - 255) when spinning down |
| | 149 | pwm[1-4]_max_output - maximum fan speed (range 1 - 255), when the temperature |
| | 150 | is above defined range. |
| | 151 | |
| | 152 | Note: last six functions are influenced by other control bits, not yet exported |
| | 153 | by the driver, so a change might not have any effect. |
| | 154 | |
| | 155 | Implementation Details |
| | 156 | ---------------------- |
| | 157 | |
| | 158 | Future driver development should bear in mind that the following registers have |
| | 159 | different functions on the 627EHF and the 627DHG. Some registers also have |
| | 160 | different power-on default values, but BIOS should already be loading |
| | 161 | appropriate defaults. Note that bank selection must be performed as is currently |
| | 162 | done in the driver for all register addresses. |
| | 163 | |
| | 164 | 0x49: only on DHG, selects temperature source for AUX fan, CPU fan0 |
| | 165 | 0x4a: not completely documented for the EHF and the DHG documentation assigns |
| | 166 | different behavior to bits 7 and 6, including extending the temperature |
| | 167 | input selection to SmartFan I, not just SmartFan III. Testing on the EHF |
| | 168 | will reveal whether they are compatible or not. |
| | 169 | |
| | 170 | 0x58: Chip ID: 0xa1=EHF 0xc1=DHG |
| | 171 | 0x5e: only on DHG, has bits to enable "current mode" temperature detection and |
| | 172 | critical temperature protection |
| | 173 | 0x45b: only on EHF, bit 3, vin4 alarm (EHF supports 10 inputs, only 9 on DHG) |
| | 174 | 0x552: only on EHF, vin4 |
| | 175 | 0x558: only on EHF, vin4 high limit |
| | 176 | 0x559: only on EHF, vin4 low limit |
| | 177 | 0x6b: only on DHG, SYS fan critical temperature |
| | 178 | 0x6c: only on DHG, CPU fan0 critical temperature |
| | 179 | 0x6d: only on DHG, AUX fan critical temperature |
| | 180 | 0x6e: only on DHG, CPU fan1 critical temperature |
| | 181 | |
| | 182 | 0x50-0x55 and 0x650-0x657 are marked "Test Register" for the EHF, but "Reserved |
| | 183 | Register" for the DHG |
| | 184 | |
| | 185 | The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and |
| | 186 | the ICH8 southbridge gets that data via PECI from the DHG, so that the |
| | 187 | southbridge drives the fans. And the DHG supports SST, a one-wire serial bus. |
| | 188 | |
| | 189 | The DHG-P has an additional automatic fan speed control mode named Smart Fan |
| | 190 | (TM) III+. This mode is not yet supported by the driver. |
projects / linux-2.6-block.git / blame_incremental