[ts-7000] Help - confused by platform driver code.

["Dom Storey" <>]

Hi 

I'm developing a kernel driver for the relay8 board based on kernel 2.6.33 - 
I'm quite new to this and I am finding some of the calls in drivers hard to 
understand. 

I need to do i/o on 3 registers - offset at {0, 1, 2} from base (after I have 
located the base of the board 0x11e00000 + {0x140,0x150,0x160,0x170} depending 
on board jumper).

This location should be done in the probe routine of the driver. Yet on all the 
other drivers I have examined, I can't see how they locate specific locations 
in memory.

Most drivers seem to have

static __devinit int mydrv_probe(struct platform_device *pdev)
{
      ...
    r_data = platform_get_resource(pdev, IORESOURCE_MEM, 0);

followed by something like 

    ioport = ioremap(r_data->start, r_data->end - r_data->start + 1);
      ...

so I am getting the feeling that something in the kernel which is calling 
mydrv_probe with the pdev structure filled out magically with the right address 
mappings. Yet I can't seem to find any configuration file anywhere else that 
would indicate this. 

Google searches on platform driver development don't seem to return anything 
useful. Anyone got a source of enlightening information?

thanks Dominic



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