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 8a15a740875..030fac6cec7 100644 --- a/Documentation/hwmon/w83627ehf +++ b/Documentation/hwmon/w83627ehf @@ -2,26 +2,29 @@ Kernel driver w83627ehf ======================= Supported chips: - * Winbond W83627EHF/EHG (ISA access ONLY) + * Winbond W83627EHF/EHG/DHG (ISA access ONLY) Prefix: 'w83627ehf' Addresses scanned: ISA address retrieved from Super I/O registers - Datasheet: http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf + Datasheet: + http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83627EHF_%20W83627EHGb.pdf + DHG datasheet confidential. Authors: Jean Delvare <khali@linux-fr.org> Yuan Mu (Winbond) Rudolf Marek <r.marek@assembler.cz> + David Hubbard <david.c.hubbard@gmail.com> Description ----------- -This driver implements support for the Winbond W83627EHF and W83627EHG -super I/O chips. We will refer to them collectively as Winbond chips. +This driver implements support for the Winbond W83627EHF, W83627EHG, and +W83627DHG super I/O chips. We will refer to them collectively as Winbond chips. The chips implement three temperature sensors, five fan rotation -speed sensors, ten analog voltage sensors, alarms with beep warnings (control -unimplemented), and some automatic fan regulation strategies (plus manual -fan control mode). +speed sensors, ten analog voltage sensors (only nine for the 627DHG), alarms +with beep warnings (control unimplemented), and some automatic fan regulation +strategies (plus manual fan control mode). Temperatures are measured in degrees Celsius and measurement resolution is 1 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) /sys files ---------- +name - this is a standard hwmon device entry. For the W83627EHF and W83627EHG, + it is set to "w83627ehf" and for the W83627DHG it is set to "w83627dhg" + pwm[1-4] - this file stores PWM duty cycle or DC value (fan speed) in range: 0 (stop) to 255 (full) @@ -83,3 +89,37 @@ pwm[1-4]_stop_time - how many milliseconds [ms] must elapse to switch Note: last two functions are influenced by other control bits, not yet exported by the driver, so a change might not have any effect. + +Implementation Details +---------------------- + +Future driver development should bear in mind that the following registers have +different functions on the 627EHF and the 627DHG. Some registers also have +different power-on default values, but BIOS should already be loading +appropriate defaults. Note that bank selection must be performed as is currently +done in the driver for all register addresses. + +0x49: only on DHG, selects temperature source for AUX fan, CPU fan0 +0x4a: not completely documented for the EHF and the DHG documentation assigns + different behavior to bits 7 and 6, including extending the temperature + input selection to SmartFan I, not just SmartFan III. Testing on the EHF + will reveal whether they are compatible or not. + +0x58: Chip ID: 0xa1=EHF 0xc1=DHG +0x5e: only on DHG, has bits to enable "current mode" temperature detection and + critical temperature protection +0x45b: only on EHF, bit 3, vin4 alarm (EHF supports 10 inputs, only 9 on DHG) +0x552: only on EHF, vin4 +0x558: only on EHF, vin4 high limit +0x559: only on EHF, vin4 low limit +0x6b: only on DHG, SYS fan critical temperature +0x6c: only on DHG, CPU fan0 critical temperature +0x6d: only on DHG, AUX fan critical temperature +0x6e: only on DHG, CPU fan1 critical temperature + +0x50-0x55 and 0x650-0x657 are marked "Test Register" for the EHF, but "Reserved + Register" for the DHG + +The DHG also supports PECI, where the DHG queries Intel CPU temperatures, and +the ICH8 southbridge gets that data via PECI from the DHG, so that the +southbridge drives the fans. And the DHG supports SST, a one-wire serial bus. |