On Wed, Nov 16, 2011 at 8:02 PM, anish kumar <anish198519851985@gmail.com> wrote:

On Wed, 2011-11-16 at 18:00 +0530, Praveen kumar wrote:
> Hi All,
> I have a I2C chip driver,and there are two identical chips on
> two different i2c bus.
> I have registered the driver and initialized it and created two
> nodes /dev/chip_0 and /dev/chip_1
>
> If I open the node from user how will I make driver identify which
> device to access .ie in the ioctl.

So in your ioctl call you want to get the device structure right?
If yes then have a look at scull/main.c file in scull folder at below
location.
git://github.com/martinezjavier/ldd3.git

Basically you need to set private_data of filp at open time with device
information and get the private_data from filp in ioctl.
If you don't understand then just have a look at the file I mentioned.

>
> Am I clear ???
>
> Praveen
>
>

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