Re: patch for sysfs in the cyclades driver

[Roland Dreier <roland@topspin.com>]

    Marcelo> The problem was class_simple only contains the "dev"
    Marcelo> attribute. You can't add other attributes to it.

I believe, based on the comment in class_simple.c:

  Any further sysfs files that might be required can be created using this pointer.

and the implementation in in drivers/scsi/st.c, that there's no
problem adding attributes to a device in a simple class.  You can just
use class_set_devdata() on your class_device to set whatever context
you need to get back to your internal structures, and then use
class_device_create_file() to add the attributes.

I assume this is OK (since there is already one in-kernel driver doing
it), but Greg, can you confirm that it's definitely OK for a driver to
use class_set_devdata() on a class_device from class_simple_device_add()?

Thanks,
  Roland