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hwmon/w83627ehf: Add support for the W83627DHG chip

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Signed-off-by: David Hubbard <david.c.hubbard@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
David Hubbard
2007-02-14 21:15:04 +01:00
committed by Jean Delvare
parent 37f54ee546
commit 657c93b10f
2 changed files with 90 additions and 18 deletions
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54
Documentation/hwmon/w83627ehf
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@ -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.