How to add a device file to sysfs?

[Aubrey]

Hi all,

When a misc device file is registered, there are two files under my
own class directory:

/sys --> class --> misc --> myprog --> dev
                                                 --> uevent
                                                 --> myprog_show (to be added)

Now, my question is, is it possbile to add the third file
"myprog_show" under "myprog" directory without modify any common code?

I've read the doc under linux-2.6.x/Documentation, I can add it to
some other directory under /sys, but not found a way to add it to my own
directory.

Thanks for any help.
-Aubrey
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