[i2c] "regd i2c-viapro bus driver"

[savitha joshi]

Hi Jean,

Thanks for your valuable suggestions.

My motherboard has VT 8251 southbridge and from your
answers it looks like the linux 2.6.11.12 kernel
doesn't support the drivers for this south bridge.
Now my question is
1.whether any of the latest kernel versions already
support this chipset for i2c? if so which linux
version i should use?
2. Can i patch my kernel to support this chip? where
can i get the patch for this?
3.how to enable the auto detect feature in linux?
Please advice

thanks
Savitha

--- Jean Delvare <khali at linux-fr.org> wrote:

> Hi Savitha,
> 
> > I am trying to access the i2c bus/adapter using
> user
> > mode /dev interface in linux box based on VIA
> chipset.
> > I read the related documentation before starting
> my
> > work. I am using linux kernel version 2.6.11.12. I
> > configured the kernel with the options to include
> > i2-core, i2c-dev, i2c-bus /adapter drivers and
> also
> > few i2-c chips drivers. after loading this kernel
> i
> > found entries in /sys/class/i2c-dev as i2c-0,
> i2c-1
> > etc and also in the /dev folder. 
> > I wrote user mode application to open the device
> > /dev/i2c-0 and it worked fine. When i selected
> > i2c-viapro in the i2c bus driver as my chipset is
> via
> > chip (earlier i used i2c-parpart and i2c_piix etc
> in
> > the bus driver list)and build the kernel, i am not
> > able to see any entries in the /sys/class/i2c-dev
> > folder and also in /dev folder. Now my question is
> > 1. How i could see the bus driver loaded for other
> > i2c-bus driver options like i2c-parport etc and
> why
> > not for i2c-viapro?
> 
> If you have enabled hotplug support, most drivers
> will load even if you
> do not have the hardware, because the hardware could
> always be
> hotplugged later. So what really matters is not that
> the driver loaded,
> but whether or not it found a supported device. You
> can look
> into /sys/devices to find out.
> 
> > 2.If i load the i2c-viapro dynamically using the
> > command insmod i2c-viapro.ko, it loads fine but
> still
> > i am not able to see the entry in /dev and /sys
> > folder? Please suggest me if i am doing anything
> > wrong?
> 
> Most probably you do not have hardware supported by
> this version of the
> driver. You can compare the list of supported
> devices in the driver
> source file with the output of lspci to make sure.
> What VIA south
> bridge do you have exactly? i2c-viapro in 2.6.11
> does not support the
> latest VIA south bridges (VT8237A and VT8251) by
> default.
> 
> > I'am trying to see the working of i2c-dev, user
> mode
> > interface.
> 
> Don't forget to load i2c-dev then (or build it into
> the kernel itself.)
> You can use the i2cdetect tool to check whether your
> I2C/SMBus master
> is working properly:
> 
> $ i2cdetect -l
> will list the available busses.
> 
> $ i2cdetect 0
> will scan bus i2c-0 for chips.
> 
> -- 
> Jean Delvare
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com