[parisc-linux] Untested port of parisc_device to generic device interface

[Adam J. Richter]

Grant Grundler writes:
>Documentation/driver-model/overview.txt:
>| Note also that it is at the _end_ of struct pci_dev. This is
>| to make people think about what they're doing when switching between the bus
>| driver and the global driver; and to prevent against mindless casts between
>| the two.
>
>Until this changes, I don't see this as a useful replacement for
>either PCI or parisc devices. The "mindless casts" can be fixed.
>But without the ability to easily go from generic device type to
>bus specific type, people will just get lost in the maze of pointers.

	linux-2.5.46/include/linux/kernel.h already defines
container_of(ptr_to_element, parent_struct, element_name).

>From <linux/pci.h>:
#define to_pci_dev(n) container_of(n, struct pci_dev, dev)

>From <linux/usb.h>:
#define to_usb_device(d) container_of(d, struct usb_device, dev)

>From <asm-parisc/hardware.h> with my parisc device patch:
static inline struct parisc_device *to_parisc_dev(struct device *dev)
{
        return container_of(dev, struct parisc_device, device);
}

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