Hi Jean
This is chunhao, I'm implementing the function about Winbond Smart Fan,
I want to discuss with you about it. :-)
1 *
> I just took a look at the datasheet. It happens that Smart Fan II fits
> rather good in the auto-fan-speed-control scheme currently defined in
> the 2.6 kernel, so it shouldn't be a problem. The only difference is
> that for each trip point, we define a high temperature limit and an
> hysteresis temperature, while the W83792D chip defines a medium limit
> with a tolerance. It's just a matter of arithmetics to convert from
one
> to the other.
According to the 792 DataSheet "7.7.4 Smart Fan II control"(page 26)
Which sys interface should I use?
pwm[1-4]_auto_point[1-4]_temp or temp[1-4]_auto_point[1-4]_pwm ?
Is there any chip drivers which I can refer to?
2 *
> Smart Fan I, aka cruise mode, doesn't quite fit in the model, although
> it could be seen as an approximate subset of Smart Fan II. I see
little
> reason to implement Smart Fan I when Smart Fan II is so obviously
> better, so I wouldn't implement it at all.
Then I have to discard the Winbond Smart Fan I function in linux-2.6
driver.
But I will keep it for 792 driver for linux-2.4.
3 *
> The only thing I think is missing the the sysfs interface for the
W83792D
> is the possibility to switch from PWM to DC and back. I would propose
> new files named "pwmN_mode", that would have possible values "PWM"
> and "DC". This however needs to be discussed, and approval by the
> majority of i2c/lm_sensors devs is required (this is obviously
> sujective).
Do you have any progress about it? Can I use the interface
"pwm[1-3]_mode"
in my 792 driver for linux-2.6?
4 *
Quoting /usr/src/linux-2.6.10/Documentation/i2c/sysfs-interface:
pwm[1-3]_enable
Switch PWM on and off.
Not always present even if fan*_pwm is.
0 to turn off
1 to turn on in manual mode
2 to turn on in automatic mode
Read/Write
But in 792 data sheet, I do not find and register to switch PWM off,
There are three options in 792 data sheet page54( CR[0x84h] ):
Manual PWM/DC Control Mode
Thermal Cruise mode
Smart FAN II mode
Since I have to discard "Thermal Cruise mode ", I'm going to implement
pwm[1-3]_enable like this:
1 to turn on in manual mode
2 to turn on in automatic mode
Do you have any disagreement or suggestion about it?
5 *
It seems that there is no sys interface for Chassis(Case Open), then
I will have to discard the function for chassis intrusion detection
under linux-2.6?
Thanks
Best Regards
Chunhao
2005-03-08
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