A question when test W83792D driver on another motherboard

Huang0 at Winbond.com.tw Huang0 at Winbond.com.tw
Wed Feb 23 08:57:46 CET 2005

Hi Jean

This is chunhao.

As to the problem we meet on ASUS NCLV-D. I spent some time to debug
792 driver and i2c-proc driver. Here is some important information I
want to send you:

The 792 driver can NOT work on this motherboard because the function
w83792d_detect() in 792 driver can NOT be executed. The further reason

In i2c-2.9.0/kernel/i2c-proc.c, function i2c_detect():
The returned value of
i2c_smbus_xfer(adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL)
(Note: line 792 in i2c-proc.c)
is less than zero, it's value is always -1.
While on my another motherboard(ASUS PSCH-SR) that 792 driver can work.
The returned value of i2c_smbus_xfer() is zero, so w83792d_detect()
can be successfully executed.

Can you give us some help according above information?
We are going to try our 792 driver for Windows on this motherboard,
To find whether 792 driver for Windows version can work on it.
If can, I will contact you again. :-)

Best Regards

> -----Original Message-----
> From: PI14 HUANG0
> Sent: 2005Äê2ÔÂ23ÈÕ 11:49
> To: 'Jean Delvare'
> Cc: LM Sensors; PI10 LHHsu; PI14 DZSHEN; PI13 CFLi
> Subject: RE: A question when test W83792D driver on another motherboard
> Hi Jean
> > I'd bet one buck that this "AAA" board was made by Asus. Right?
> Yes, you are right, that motherboard is ASUS NCLV-D.
> > We have had a report already with an Asus NCL-DS board. We know it has a
> > W83792D chip, but it is somehow hidden. All our attempts to unhide it
> > failed.
> > http://archives.andrew.net.au/lm-sensors/msg28885.html
> >
> > If you have a similar case, I am sorry but there's nothing we can do.
> > Your only hope is to ask the motherboard manufacturer for additional
> > information.
> What information should we ask ASUS to provide? Could you tell us more
> about it?
> In your opinion, what is the exact reason that 792 driver can NOT work
> on this motherboard? The bug of 792 driver? the bug of i2c bus driver?
> or the bug of the motherboard itself? Can we make the 792 driver work
> if we modify w83792d.c when we know the "hidden information" you mentioned.
> Thanks
> Best Regards
> Chunhao.
> 2005-02-23

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