| 1 | Kernel driver `w83627ehf.o' |
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| 2 | =========================== |
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| 3 | |
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| 4 | Status: Stable; some missing features. |
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| 5 | |
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| 6 | Supported chips: |
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| 7 | * Winbond W83627EHF/EHG (ISA access ONLY) |
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| 8 | Prefix: 'w83627ehf' |
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| 9 | Addresses scanned: ISA address retrieved from Super I/O registers |
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| 10 | Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf |
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| 11 | |
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| 12 | Authors: |
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| 13 | Jean Delvare <khali@linux-fr.org> |
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| 14 | Yuan Mu (Winbond) |
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| 15 | Rudolf Marek <r.marek@assembler.cz> |
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| 16 | David Hubbard <david.c.hubbard@gmail.com> |
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| 17 | |
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| 18 | Thanks to Observit and Bernardo Motta for providing a motherboard, CPU |
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| 19 | and memory that made it possible to backport the w83627ehf driver from |
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| 20 | Linux 2.6 to Linux 2.4. |
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| 21 | |
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| 22 | |
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| 23 | Description |
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| 24 | ----------- |
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| 25 | |
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| 26 | This driver implements support for the Winbond W83627EHF and W83627EHG |
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| 27 | super I/O chips. Support for the W83627DHG isn't included, but could be |
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| 28 | easily added if needed. |
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| 29 | |
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| 30 | The chips implement three temperature sensors, five fan rotation speed |
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| 31 | sensors, ten analog voltage sensors, alarms with beep warnings (control |
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| 32 | unimplemented), some automatic fan regulation strategies (unimplemented) |
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| 33 | and manual fan speed control. |
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| 34 | |
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| 35 | Temperatures are measured in degrees Celsius and measurement resolution is |
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| 36 | 1 degree Celsius for temp1 and 0.5 degee Celsius for temp2 and temp3. An |
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| 37 | alarm is triggered when the temperature gets higher than high limit; it |
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| 38 | stays on until the temperature falls below the hysteresis value. |
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| 39 | |
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| 40 | Fan rotation speeds are reported in RPM (rotations per minute). An alarm is |
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| 41 | triggered if the rotation speed has dropped below a programmable limit. Fan |
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| 42 | readings can be divided by a programmable divider (1, 2, 4, 8, 16, 32, 64 or |
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| 43 | 128) to give the readings more range or accuracy. The driver sets the most |
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| 44 | suitable fan divisor itself. Some fans might not be present because they |
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| 45 | share pins with other functions. |
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| 46 | |
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| 47 | Voltage sensors (also known as IN sensors) report their values in Volts. |
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| 48 | An alarm is triggered if the voltage has crossed a programmable minimum |
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| 49 | or maximum limit. |
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| 50 | |
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| 51 | |
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| 52 | Fan speed control |
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| 53 | ----------------- |
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| 54 | |
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| 55 | The chips support 4 different fan speed control modes. The currently |
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| 56 | selected mode can be read from (and written to) the second value of |
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| 57 | files pwm[1-4]. Modes are: |
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| 58 | |
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| 59 | 1: Manual mode. The desired fan speed can be written to the first |
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| 60 | value of the pwm[1-4] file, from 0 (stop) to 255 (full speed). |
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| 61 | 2: Thermal cruise mode (unimplemented). |
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| 62 | 3: Fan speed cuise mode (unimplemented). |
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| 63 | 4: Smart Fan III mode (pwm2 and pwm4 only, unimplemented). |
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| 64 | |
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| 65 | While the automatic modes are not implemented by this driver, they can |
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| 66 | still be selected, so they will work if (and only if) the BIOS has |
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| 67 | programmed the chip with sensible register values. |
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