Re: How does the driver initialize corresponding with several same devices ?

[Javier Martinez Canillas <martinez.javier@xxxxxxxxx>]

On Wed, Apr 18, 2012 at 11:16 AM, Li Haifeng <omycle@xxxxxxxxx> wrote:
> I make a driver module and built in the kernel. There are three devices use
> the same driver on the hardware platform. To use each device, the probe
> function of the driver module should be probed. So, the driver module is
> registered in the kernel.
>
> My question is, how times should the probe function of the driver be called
> and create nodes in devfs to corresponding with the three devices?
>

Your driver probe function has to be called only once. You should have
in your driver a software representation of each device and register
each one with the corresponding subsystem and with the kernel kernel
device model to populate /dev with your device nodes.

How do you represent your devices internally is up to you, it can be
assigned on your module init function as a static array or you can do
it dynamically using a linked list.

Look at any driver inside drivers/char for reference.

Hope it helps,

-- 
Javier Martínez Canillas
(+34) 682 39 81 69
Barcelona, Spain

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