* Winbond W83627EHF/EHG (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.nuvoton.com.tw/NR/rdonlyres/A6A258F0-F0C9-4F97-81C0-C4D29E7E943E/0/W83627EHF.pdf
+ * Winbond W83627DHG
+ Prefix: 'w83627dhg'
+ Addresses scanned: ISA address retrieved from Super I/O registers
+ Datasheet:
+ http://www.nuvoton.com.tw/NR/rdonlyres/7885623D-A487-4CF9-A47F-30C5F73D6FE6/0/W83627DHG.pdf
+ * Winbond W83667HG
+ Prefix: 'w83667hg'
+ Addresses scanned: ISA address retrieved from Super I/O registers
+ Datasheet: not available
Authors:
Jean Delvare <khali@linux-fr.org>
Yuan Mu (Winbond)
Rudolf Marek <r.marek@assembler.cz>
+ David Hubbard <david.c.hubbard@gmail.com>
+ Gong Jun <JGong@nuvoton.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,
+W83627DHG and W83667HG 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), one
+VID (6 pins for the 627EHF/EHG, 8 pins for the 627DHG and 667HG), 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
temp1 -> pwm1
temp2 -> pwm2
temp3 -> pwm3
-prog -> pwm4 (the programmable setting is not supported by the driver)
+prog -> pwm4 (not on 667HG; 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)
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.
git.samba.org / sfrench / cifs-2.6.git / blobdiff