diff options
Diffstat (limited to 'Documentation/hwmon')
| -rw-r--r-- | Documentation/hwmon/w83627ehf | 54 |
1 files changed, 47 insertions, 7 deletions
diff --git a/Documentation/hwmon/w83627ehf b/Documentation/hwmon/w83627ehf index 8a15a7408753..030fac6cec7a 100644 --- a/Documentation/hwmon/w83627ehf +++ b/Documentation/hwmon/w83627ehf | |||
| @@ -2,26 +2,29 @@ Kernel driver w83627ehf | |||
| 2 | ======================= | 2 | ======================= |
| 3 | 3 | ||
| 4 | Supported chips: | 4 | Supported chips: |
| 5 | * Winbond W83627EHF/EHG (ISA access ONLY) | 5 | * Winbond W83627EHF/EHG/DHG (ISA access ONLY) |
| 6 | Prefix: 'w83627ehf' | 6 | Prefix: 'w83627ehf' |
| 7 | Addresses scanned: ISA address retrieved from Super I/O registers | 7 | Addresses scanned: ISA address retrieved from Super I/O registers |
| 8 | Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf | 8 | Datasheet: |
| 9 | http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf | ||
| 10 | DHG datasheet confidential. | ||
| 9 | 11 | ||
| 10 | Authors: | 12 | Authors: |
| 11 | Jean Delvare <khali@linux-fr.org> | 13 | Jean Delvare <khali@linux-fr.org> |
| 12 | Yuan Mu (Winbond) | 14 | Yuan Mu (Winbond) |
| 13 | Rudolf Marek <r.marek@assembler.cz> | 15 | Rudolf Marek <r.marek@assembler.cz> |
| 16 | David Hubbard <david.c.hubbard@gmail.com> | ||
| 14 | 17 | ||
| 15 | Description | 18 | Description |
| 16 | ----------- | 19 | ----------- |
| 17 | 20 | ||
| 18 | This driver implements support for the Winbond W83627EHF and W83627EHG | 21 | This driver implements support for the Winbond W83627EHF, W83627EHG, and |
| 19 | super I/O chips. We will refer to them collectively as Winbond chips. | 22 | W83627DHG super I/O chips. We will refer to them collectively as Winbond chips. |
| 20 | 23 | ||
| 21 | The chips implement three temperature sensors, five fan rotation | 24 | The chips implement three temperature sensors, five fan rotation |
| 22 | speed sensors, ten analog voltage sensors, alarms with beep warnings (control | 25 | speed sensors, ten analog voltage sensors (only nine for the 627DHG), alarms |
| 23 | unimplemented), and some automatic fan regulation strategies (plus manual | 26 | with beep warnings (control unimplemented), and some automatic fan regulation |
| 24 | fan control mode). | 27 | strategies (plus manual fan control mode). |
| 25 | 28 | ||
| 26 | Temperatures are measured in degrees Celsius and measurement resolution is 1 | 29 | Temperatures are measured in degrees Celsius and measurement resolution is 1 |
| 27 | degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when | 30 | degC for temp1 and 0.5 degC for temp2 and temp3. An alarm is triggered when |
| @@ -55,6 +58,9 @@ prog -> pwm4 (the programmable setting is not supported by the driver) | |||
| 55 | /sys files | 58 | /sys files |
| 56 | ---------- | 59 | ---------- |
| 57 | 60 | ||
| 61 | name - this is a standard hwmon device entry. For the W83627EHF and W83627EHG, | ||
| 62 | it is set to "w83627ehf" and for the W83627DHG it is set to "w83627dhg" | ||
| 63 | |||
| 58 | pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range: | 64 | pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range: |
| 59 | 0 (stop) to 255 (full) | 65 | 0 (stop) to 255 (full) |
| 60 | 66 | ||
| @@ -83,3 +89,37 @@ pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch | |||
| 83 | 89 | ||
| 84 | Note: last two functions are influenced by other control bits, not yet exported | 90 | Note: last two functions are influenced by other control bits, not yet exported |
| 85 | by the driver, so a change might not have any effect. | 91 | by the driver, so a change might not have any effect. |
| 92 | |||
| 93 | Implementation Details | ||
| 94 | ---------------------- | ||
| 95 | |||
| 96 | Future driver development should bear in mind that the following registers have | ||
| 97 | different functions on the 627EHF and the 627DHG. Some registers also have | ||
| 98 | different power-on default values, but BIOS should already be loading | ||
| 99 | appropriate defaults. Note that bank selection must be performed as is currently | ||
| 100 | done in the driver for all register addresses. | ||
| 101 | |||
| 102 | 0x49: only on DHG, selects temperature source for AUX fan, CPU fan0 | ||
| 103 | 0x4a: not completely documented for the EHF and the DHG documentation assigns | ||
| 104 | different behavior to bits 7 and 6, including extending the temperature | ||
| 105 | input selection to SmartFan I, not just SmartFan III. Testing on the EHF | ||
| 106 | will reveal whether they are compatible or not. | ||
| 107 | |||
| 108 | 0x58: Chip ID: 0xa1=EHF 0xc1=DHG | ||
| 109 | 0x5e: only on DHG, has bits to enable "current mode" temperature detection and | ||
| 110 | critical temperature protection | ||
| 111 | 0x45b: only on EHF, bit 3, vin4 alarm (EHF supports 10 inputs, only 9 on DHG) | ||
| 112 | 0x552: only on EHF, vin4 | ||
| 113 | 0x558: only on EHF, vin4 high limit | ||
| 114 | 0x559: only on EHF, vin4 low limit | ||
| 115 | 0x6b: only on DHG, SYS fan critical temperature | ||
| 116 | 0x6c: only on DHG, CPU fan0 critical temperature | ||
| 117 | 0x6d: only on DHG, AUX fan critical temperature | ||
| 118 | 0x6e: only on DHG, CPU fan1 critical temperature | ||
| 119 | |||
| 120 | 0x50-0x55 and 0x650-0x657 are marked "Test Register" for the EHF, but "Reserved | ||
| 121 | Register" for the DHG | ||
| 122 | |||
| 123 | The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and | ||
| 124 | the ICH8 southbridge gets that data via PECI from the DHG, so that the | ||
| 125 | southbridge drives the fans. And the DHG supports SST, a one-wire serial bus. | ||